C02 - Structure Of Atom
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Which substance is an element?
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Air
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Stim
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Carbon
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Napthalene
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.JPG "C02 - Structure Of Atom - Quiz")
This quiz titled 'C02 - Structure of Atom' assesses foundational knowledge in chemistry, focusing on atomic structure. It evaluates understanding of scientific investigations, elements, compounds, and molecular theory, essential for learners in chemistry.
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- 2.
Which of the following processes, proved the kinetic theory of matter?
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Diffusion
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Photosynthesis
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Respiration
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Neutralization
Correct Answer
A. DiffusionExplanation
Diffusion is the process by which particles move from an area of high concentration to an area of low concentration. This process is a direct result of the kinetic theory of matter, which states that all particles are in constant motion. Diffusion occurs because the particles are constantly moving and colliding with each other, causing them to spread out and distribute evenly. Therefore, diffusion is a process that provides evidence for the kinetic theory of matter.Rate this question:
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- 3.
Diagram shows the symbols for chlorine atom. Which of the following is true based on the symbols in diagram1.
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A
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B
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C
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D
Correct Answer
A. AExplanation
Based on the symbols in the diagram, we can see that the symbol for chlorine atom is Cl. Therefore, it is true that the symbol for chlorine atom is Cl.Rate this question:
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- 4.
The nucleus of an atom contains
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Electrons only
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Neutrons only
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Both protons and neutrons
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Both protons and electrons
Correct Answer
A. Both protons and neutronsExplanation
The nucleus of an atom contains both protons and neutrons. Protons have a positive charge and are responsible for determining the atomic number of an element. Neutrons have no charge and help stabilize the nucleus by balancing the repulsive forces between protons. Electrons, on the other hand, are found outside the nucleus in electron shells and are negatively charged. Therefore, the correct answer is both protons and neutrons.Rate this question:
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- 5.
Atom X has a proton number 9 and the nucleon number is 19. Which of the following symbols is for atom X?
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A
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B
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C
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D
Correct Answer
A. BExplanation
The correct symbol for atom X is B. The proton number of an atom represents the number of protons in its nucleus, which in this case is 9. The nucleon number, also known as the mass number, represents the total number of protons and neutrons in the nucleus, which in this case is 19. Therefore, the symbol for atom X should have 9 protons and 19 nucleons, which is represented by option B.Rate this question:
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- 6.
The diagram shows the change of state of matter. Which of the following is process X?
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Melting
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Boiling
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Freezing
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Condensation
Correct Answer
A. BoilingExplanation
The diagram shows the process of boiling, which is the change of state from a liquid to a gas. This is evident from the upward arrows indicating the release of gas particles. Boiling occurs when a substance is heated to its boiling point, causing the liquid particles to gain enough energy to overcome the intermolecular forces and escape into the gas phase. Therefore, process X in the diagram is boiling.Rate this question:
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- 7.
The diagram shows the partivles arrangement of a substance at room temperature. What is the substance?
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Water
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Helium
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Chlorine
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Nitrogen
Correct Answer
A. HeliumExplanation
The diagram shows the particles arranged in a random and dispersed manner. This indicates that the substance is in a gaseous state at room temperature. Among the given options, only Helium is a gas at room temperature, making it the correct answer.Rate this question:
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- 8.
The following information is about an atom with the number of neutrons is 10 and the nucleon number is 20. Which of the following diagram shows the atom?
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A
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B
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C
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D
Correct Answer
A. A -
- 9.
Which of the following diagram represents magnesium oxide?
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A
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B
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C
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D
Correct Answer
A. C -
- 10.
An enclosed cylinder is filled with helium atoms. Which diagram shows the arrangement of the helium atoms?
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A
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B
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C
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D
Correct Answer
A. DExplanation
Diagram D shows the arrangement of the helium atoms in an enclosed cylinder. The helium atoms are evenly distributed throughout the cylinder, with no specific pattern or arrangement. This is because helium atoms are small and have weak intermolecular forces, allowing them to move freely and occupy the entire space within the cylinder. Therefore, diagram D accurately represents the arrangement of helium atoms in an enclosed cylinder.Rate this question:
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- 11.
Diagram 1 shows an experiment to study the partivles theory of matter. After 30 minutes, the water turns purple. What is the process occur in the experiment shown in the diagram 1?
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Melting process
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Freezing process
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Diffusion process
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Evaporation process
Correct Answer
A. Diffusion processExplanation
The process occurring in the experiment shown in Diagram 1 is diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. In this case, the purple color of the water indicates that a substance has been added to it, and over time, the particles of this substance spread out evenly throughout the water, resulting in the purple color diffusing throughout the entire solution.Rate this question:
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- 12.
The diagram shows the aparatus set - up to investigate Process X. What is Process X?
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Diffusion
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Condensation
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Evaporation
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Sublimation
Correct Answer
A. DiffusionExplanation
The diagram shows an apparatus set up to investigate Process X. Diffusion is the movement of particles from an area of high concentration to an area of low concentration. In the given diagram, there is a concentration gradient indicated by the arrows, suggesting the movement of particles from one side to the other. This is characteristic of diffusion, making it the correct answer.Rate this question:
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- 13.
The diagram shows the atomic symbol of element X.
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A
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B
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C
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D
Correct Answer
A. A -
- 14.
Table 2 shows the melting point and boiling points of fice compounds J, K, L, M and N. Which substances exists as a liquid at toom temperature?
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J only
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J and K only
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K and L only
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M and N only
Correct Answer
A. K and L onlyExplanation
Substances K and L exist as liquids at room temperature because their boiling points are below room temperature. J has a higher boiling point, so it exists as a solid at room temperature. M and N have even higher boiling points, so they exist as gases at room temperature.Rate this question:
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- 15.
Which of the following substances sublimes when heated?
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Ammonium chloride
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Potassium chloride
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Lead(II) chloride
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Zinc chloride
Correct Answer
A. Ammonium chlorideExplanation
Ammonium chloride is the substance that sublimes when heated. Sublimation is the process in which a solid directly turns into a gas without passing through the liquid state. When heated, ammonium chloride undergoes sublimation, meaning it goes from a solid directly to a gas, without melting into a liquid first. This is due to the compound's unique chemical properties and its ability to vaporize at a relatively low temperature.Rate this question:
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- 16.
Diagram 1 shows the partivles arrangement for the change of state of matter. Which of the following is Process X?
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Evaporation
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Sublimation
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Condensation
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Boiling
Correct Answer
A. SublimationExplanation
Process X is sublimation. Sublimation is the process in which a solid directly changes into a gas without going through the liquid state. In the given diagram, it shows particles arranged in a solid state on one side and in a gaseous state on the other side, indicating the direct transition from solid to gas, which is characteristic of sublimation.Rate this question:
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- 17.
What is the first step in a scientific investigation?
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Making a hypothesis
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Making an observation
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Identifiying the problem
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Planning an experiment
Correct Answer
A. Identifiying the problemExplanation
The first step in a scientific investigation is identifying the problem. Before any research or experimentation can take place, scientists must clearly define the problem they wish to solve or the question they want to answer. This step helps to focus the investigation and guide the subsequent steps of making observations, forming a hypothesis, and planning an experiment. Identifying the problem is crucial in ensuring that the scientific investigation is purposeful and targeted towards finding a solution or gaining new knowledge.Rate this question:
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- 18.
Which of these substances will sublimate when heated?
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Ice
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Iodine
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Chlorine
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Sodium chloride
Correct Answer
A. IodineExplanation
Iodine will sublimate when heated because it undergoes a phase change directly from a solid to a gas without passing through the liquid phase. Sublimation occurs when the vapor pressure of a solid exceeds atmospheric pressure at a given temperature, causing the solid to transform into a gas. In the case of iodine, heating it causes the solid iodine crystals to vaporize and form a purple-colored gas.Rate this question:
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- 19.
Diagram 1 shows the inter conversion of water, steam and ice. In which conversion do the molecule lose speed?
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Ice ---> water
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Ice ---> steam
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Water ---> steam
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Steam ---> ice
Correct Answer
A. Steam ---> iceExplanation
When steam converts into ice, the molecules lose speed. This is because steam is in the gaseous state and the molecules are moving rapidly and freely. However, when steam cools down and condenses into ice, the molecules slow down and become tightly packed. Therefore, the conversion from steam to ice involves a decrease in molecular speed.Rate this question:
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- 20.
Atom of oxygen-18 has 8 electrons. How many neutrons does an atom of oxygen-18 contains?
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6
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8
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10
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18
Correct Answer
A. 10Explanation
An atom of oxygen-18 has 8 electrons, which is the same as the number of protons in the nucleus. Since the atomic number of oxygen is 8, this means that oxygen-18 has 8 protons. The atomic mass of oxygen-18 is 18, so to find the number of neutrons, we subtract the number of protons from the atomic mass. Therefore, an atom of oxygen-18 contains 10 neutrons.Rate this question:
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- 21.
Which of the following shows the correct type of particle for each substance?
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A
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B
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C
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D
Correct Answer
A. BExplanation
The correct answer is B because it shows the correct type of particle for each substance.Rate this question:
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- 22.
Which of the following substances contain molecules?
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Zinc
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Ethanol
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Sodium chloride
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Magnesium oxide
Correct Answer
A. EthanolExplanation
Ethanol contains molecules because it is an organic compound composed of carbon, hydrogen, and oxygen atoms. Molecules are formed when atoms bond together, and in the case of ethanol, the carbon, hydrogen, and oxygen atoms combine to form the molecule of ethanol. Zinc, sodium chloride, and magnesium oxide, on the other hand, do not contain molecules. Zinc is an element, and elements exist as individual atoms. Sodium chloride and magnesium oxide are both compounds, but they are formed by the attraction of ions, not molecules.Rate this question:
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- 23.
Which substance is an ionic compound?
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Ethanol
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Sulphur dioxide
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Tetrachloromethane
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Magnesium oxide
Correct Answer
A. Magnesium oxideExplanation
Magnesium oxide is an ionic compound because it is formed by the transfer of electrons between magnesium and oxygen atoms. Magnesium has a tendency to lose two electrons, becoming a positively charged ion (Mg2+), while oxygen has a tendency to gain two electrons, becoming a negatively charged ion (O2-). The resulting attraction between these oppositely charged ions forms the ionic bond in magnesium oxide. In contrast, ethanol, sulphur dioxide, and tetrachloromethane are covalent compounds, where electrons are shared between atoms rather than transferred.Rate this question:
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- 24.
Diagram 6 shows the cooling curve of liquid Y. Which statement can be deduced from Diagram 6.
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At t1, Y exist as solid
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The freezing point of Y is 70 degree celcius
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From t1 to t2, Y does not release heat energy
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From t2 to t3, the particles are less closely packed
Correct Answer
A. The freezing point of Y is 70 degree celciusExplanation
The correct answer can be deduced from Diagram 6 because at the freezing point of a substance, the temperature remains constant as the substance changes from a liquid to a solid. In Diagram 6, there is a horizontal line at 70 degrees Celsius, indicating that Y is freezing and transitioning from a liquid to a solid at this temperature.Rate this question:
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- 25.
What are the symbols of the elements of cromium, copper, manganese and pottasium?
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A
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B
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C
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D
Correct Answer
A. DExplanation
The correct answer is D because the symbols for the elements chromium, copper, manganese, and potassium are Cr, Cu, Mn, and K, respectively.Rate this question:
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- 26.
The following statements are about diffusion. * The tiny particles are discrete * The tiny particles move randomly by themselves Which of the following situations are explained by the statements above? I bromine gas mixing with air II aqueous copper(II) sulphate moving through a gel III melting of lead(II) bromide IV combustion of magnesium in air
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I and II
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I and IV
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II and III
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III and IV
Correct Answer
A. I and IIExplanation
The statements about diffusion explain situations I and II because both involve the movement of tiny particles (bromine gas and aqueous copper(II) sulphate) in a random and discrete manner.Rate this question:
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- 27.
Which of the following substances is made up of atoms?
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Argon
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Nitrogen
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Chlorine
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Ammonia
Correct Answer
A. ArgonExplanation
Argon is a chemical element with the symbol Ar and atomic number 18. It is a noble gas and exists as individual atoms. Nitrogen, chlorine, and ammonia are all compounds that consist of molecules made up of multiple atoms bonded together. However, Argon is the only substance listed that is made up of individual atoms.Rate this question:
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- 28.
Diagram 2 shows the set up of apparatus to investigate the diffusion in a liquid. After a few hours, the whole test tube of water becomes purple in colour. Which of the following statements explain the observation?
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Pottasium manganate(VII) is denser than water
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Matter is made up of partivles that expand uniformly
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Matter is made up of partivles that are moving randomly
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Particles in pottassium manganate(VII) move faster in water
Correct Answer
A. Matter is made up of partivles that are moving randomlyExplanation
The observation that the whole test tube of water becomes purple in color suggests that the particles in potassium manganate(VII) are moving randomly. This is because diffusion is the movement of particles from an area of high concentration to an area of low concentration, and the fact that the color has spread evenly throughout the water indicates that the particles are moving randomly and spreading out uniformly.Rate this question:
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- 29.
Diagram 1 shows the atomic model of an atom. Which of the following scentists suggested the model?
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Ernest Rutherford
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James Chadwick
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J.J. Thomson
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Neil's Bohr
Correct Answer
A. James ChadwickExplanation
James Chadwick suggested the atomic model shown in Diagram 1.Rate this question:
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- 30.
Which of the following statements is true about subatomic particles?
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The number of protons changes in a chemical reaction.
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Protons and neutrons are found in the nucleus of an atom.
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In an atom, the number of protons equals the number of neutrons.
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Subatomic partivles have the same mass but differ in charges.
Correct Answer
A. Protons and neutrons are found in the nucleus of an atom.Explanation
The statement that "protons and neutrons are found in the nucleus of an atom" is true. Protons and neutrons are subatomic particles that are located in the nucleus of an atom, which is the central region of the atom. The nucleus contains most of the mass of the atom, and the protons have a positive charge while the neutrons have no charge. This statement accurately describes the location and nature of these subatomic particles within an atom.Rate this question:
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- 31.
The diagram shows the arrangement of partivles in a substance at room temperature. This arrangement of partivles can be found in
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Carbon
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Cooper
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Oxygen
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Water
Correct Answer
A. OxygenExplanation
The diagram shows the arrangement of particles in a substance at room temperature. Oxygen is the correct answer because the diagram represents the arrangement of particles in oxygen at room temperature.Rate this question:
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- 32.
The diagram shows an experiment to study the particle theory of matter. Which of the following is the best explanation of the observation in the experiment?
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Agar dissolves copper(II) sulphate
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Copper(II) sulphate is an ionic compound
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Particles in copper(II) sulphate are minute and dicrete
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The attractive force between agar and copper(OO) sulphate particles is strong
Correct Answer
A. Particles in copper(II) sulphate are minute and dicreteExplanation
The observation in the experiment can be explained by the fact that the particles in copper(II) sulphate are minute and discrete. This means that the particles are very small and separate from each other. As a result, when the copper(II) sulphate is added to the agar, the particles can easily mix and dissolve in the agar. The small size and discrete nature of the particles allow for efficient mixing and dissolution.Rate this question:
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- 33.
The table shows the melting points of substances P, Q, R and S. Which of the following substances is a solid at
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P
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Q
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R
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S
Correct Answer
A. PExplanation
Based on the given information, substance P is a solid at its melting point.Rate this question:
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- 34.
The diagram shows a model of an atom. Who introduced this model?
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Neils Bohr
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John Dalton
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James Chadwick
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Ernest Rutherford
Correct Answer
A. Neils BohrExplanation
Niels Bohr introduced the model of the atom shown in the diagram. His model, known as the Bohr model, proposed that electrons orbit the nucleus in specific energy levels or shells. This model was a significant advancement in understanding atomic structure and helped explain the stability of atoms.Rate this question:
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- 35.
The following tatements refer to the contributions of a scientist in the development of ideas about atomic structure. * Discovered proton * Most of the mass of the atoms is in the nucleus * The electrons move in empty space Who was the scientist?
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Neil's Bhr
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John Dalton
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J. J Thompson
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Ernest Rutherford
Correct Answer
A. Ernest RutherfordExplanation
Ernest Rutherford is the correct answer because he made significant contributions to the understanding of atomic structure. He discovered the existence of the proton, which is a subatomic particle found in the nucleus of an atom. Rutherford also proposed the nuclear model of the atom, which states that most of the mass of an atom is concentrated in the nucleus. He conducted the famous gold foil experiment, which led to the discovery that the electrons move in empty space around the nucleus.Rate this question:
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- 36.
Table 3 shows the number of protons for elements V, W, X, Y and Z. Which of the following elements have the same number of valence electrons?
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V and Z
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W and X
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V and Y
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W and Z
Correct Answer
A. V and YExplanation
Elements V and Y have the same number of valence electrons. This is because valence electrons are the electrons in the outermost energy level of an atom, and they determine the chemical properties of an element. Looking at Table 3, we can see that V has 5 valence electrons and Y also has 5 valence electrons. Therefore, V and Y have the same number of valence electrons.Rate this question:
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- 37.
Diagram 1 shows the inter-conversion of the states of matter of a substance. Which inter-conversion involves the release of energy?
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Steam ---> ice
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Water ---> steam
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Ice ---> water
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Ice ---> steam
Correct Answer
A. Steam ---> iceExplanation
When steam converts into ice, energy is released. This is because the process of condensation occurs, where the steam loses heat energy and transforms into a solid state. This release of energy is due to the change in the molecular arrangement and the formation of stronger intermolecular forces in the ice.Rate this question:
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- 38.
The melting point and boiling point of substance M is respectively. The physical state of substance M at room temperature is
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Gas
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Liquid
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Solid
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Gas and liquid
Correct Answer
A. GasExplanation
Based on the information given, substance M has a melting point and boiling point that are not specified. However, it is stated that the physical state of substance M at room temperature is gas. This suggests that substance M has a low melting point and boiling point, causing it to exist as a gas at room temperature.Rate this question:
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- 39.
Figure 11 shows the arrangement of particles found in four substances as named. Which pairs of the arrangement of partivles and the name of the substances are paired correctly?
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I and III only
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I and IV only
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II and III only
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III and IV only
Correct Answer
A. III and IV onlyExplanation
The correct answer is III and IV only. This is because in Figure 11, substance III shows a regular and orderly arrangement of particles, which is characteristic of a crystalline solid. Substance IV, on the other hand, shows a random and disordered arrangement of particles, which is characteristic of a gas. Therefore, these pairs are correctly matched.Rate this question:
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- 40.
The diagram shows a graph of temperature against time for the heating of substance X. Which of the following is true about substance X at the sixth minute?
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All the molecules move freely
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Molecules are closely packed and atoms move freely
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Molecules and atoms move freely
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Some molecules are closely packed while some molecules move freely
Correct Answer
A. Some molecules are closely packed while some molecules move freelyExplanation
Based on the given graph, the temperature of substance X is increasing over time. This indicates that the substance is being heated. At the sixth minute, the temperature is still rising, suggesting that the heating process is ongoing. Therefore, it can be inferred that some molecules of substance X are closely packed together, while others are moving freely. This is because the increasing temperature causes the molecules to gain kinetic energy and move more rapidly, but not all molecules have reached the same level of energy distribution, resulting in some being closely packed while others move freely.Rate this question:
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- 41.
Element T has the same chemical property as the element with the proton number of 20. The letter T is not the actual symbol of the element. Which of the following is the electron arrangement for an atom of element T?
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2
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2.8.2
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2.8.4
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2.8.8
Correct Answer
A. 2.8.2Explanation
The electron arrangement for an atom of element T is 2.8.2. This means that the atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 2 electrons in the third energy level. This arrangement is consistent with the element having the same chemical property as the element with the proton number of 20.Rate this question:
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- 42.
Which of the following solids changes to gaseous state when it is heated?
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Lead(II) idide
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Silicon dioxide
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Ammonium chloride
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Copper(II) carbonate
Correct Answer
A. Ammonium chlorideExplanation
Ammonium chloride changes to the gaseous state when it is heated. This is because ammonium chloride is a compound that undergoes sublimation, which means it directly converts from a solid to a gas without passing through a liquid state. When heated, the strong ionic bonds between the ammonium (NH4+) and chloride (Cl-) ions break, and the compound vaporizes into ammonia gas (NH3) and hydrogen chloride gas (HCl). This process is endothermic, meaning it requires energy input to occur.Rate this question:
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- 43.
Which of the following statements is true about atomic model proposed by Ernest Rutherford?
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The electrons in an atom move in shells around the nucleus which contains proton.
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The atom was described as a sphere of positive charge embedded with electron.
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The nucleus of the atom contains proton and neutrons.
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The nucleus of the atom contains proton.
Correct Answer
A. The nucleus of the atom contains proton.Explanation
The correct answer is "The nucleus of the atom contains proton." This statement is true because Ernest Rutherford's atomic model proposed that the atom consists of a small, dense, positively charged nucleus at the center, which contains protons. The electrons, on the other hand, move in shells or orbits around the nucleus. This model is known as the Rutherford model or the planetary model of the atom.Rate this question:
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- 44.
The table shows the melting point and boiling point of foru substances W, X, Y and Z Which of the substances is a liquid at
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W
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X
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Y
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Z
Correct Answer
A. ZExplanation
Based on the information provided in the table, substance Z is a liquid at a certain temperature. This can be inferred because the table shows the melting point and boiling point of the substances, and Z is the only substance that has a boiling point but no melting point listed. This indicates that Z exists as a liquid at temperatures above its boiling point.Rate this question:
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- 45.
In the periodic table, Y is below Z in the same group. If the proton number of atom Z is 12, what is the electron configuration for atom Y?
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2.8.2
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2.8.6
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2.8.8.2
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2.8.8.6
Correct Answer
A. 2.8.8.2Explanation
The electron configuration of an atom represents the arrangement of electrons in its energy levels. In the periodic table, elements in the same group have similar electron configurations. Since Y is below Z in the same group, it means that Y has one more energy level than Z. The proton number of Z is 12, which corresponds to the element magnesium (Mg). The electron configuration of Mg is 2.8.2. Therefore, the electron configuration for atom Y, which has one more energy level, would be 2.8.8.2.Rate this question:
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- 46.
Diagram 3 shows a model of an atom. Which of the following is true of the atomic model? I Proposed by Neil Bohr II Was built based on the existence of the neutron III Shows that electrons move in shells around the nucleus IV Discovered through the bombardment experiment of alpha particles on gold foil
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I and III only
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II and IV only
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I, II and III only
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I, II, III and IV
Correct Answer
A. I and III onlyExplanation
The atomic model shown in Diagram 3 proposes that electrons move in shells around the nucleus. This idea was proposed by Neil Bohr, making statement I true. Statement II is false because the existence of the neutron was not the basis for this atomic model. Statement III is true because the diagram clearly shows the electrons arranged in different shells around the nucleus. Statement IV is false because the atomic model was not discovered through the bombardment experiment of alpha particles on gold foil. Therefore, the correct answer is I and III only.Rate this question:
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- 47.
Diagram shows the electron arrangement for the ion. An atom of element J contains 12 neutrons. What is the nucleon number of element J?
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10
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12
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22
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25
Correct Answer
A. 25 -
- 48.
The melting point of substance Z is and its boiling point is What is the physical state of substance Z at room temperature?
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Gas
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Solid
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Liquid
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Gas and liquid
Correct Answer
A. Liquid -
- 49.
The diagram shows a model of an atom. Who introduced this model?
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Neil's Bohr
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John Daltoh
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J.J. Thompson
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Ernest Rutherford
Correct Answer
A. J.J. ThompsonExplanation
J.J. Thompson introduced the model of an atom.Rate this question:
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.JPG "The diagram shows the arrangement of partivles in a substance at room temperature.
This arrangement of partivles can be found in")
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