Science Chapter 5 Quiz For Grade 9
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Composed of a single type of atom
About This Quiz
If you are studying in grade 9 and looking for Science chapter 5 questions and answers, you have arrived at the right place. Take the quiz below and make your preparation level better. The quiz consists of medium to hard level Science questions. So, if your basics are strong in this subject, this quiz will not be hard for you. Sounds cool? Give it a try and check how good your Science is. All the very best!
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- 2.
Carry a negative charge
Explanation
An electron is a subatomic particle that carries a negative charge. It is one of the fundamental particles that make up an atom. Electrons orbit around the nucleus of an atom and are involved in various chemical reactions and electrical currents. Due to its negative charge, electrons are attracted to positively charged particles and repel other negatively charged particles. This property of carrying a negative charge is unique to electrons and distinguishes them from other particles such as protons and neutrons.Rate this question:
- 3.
Atom's dense central core
Explanation
The correct answer is "nucleus." The explanation for this is that the nucleus refers to the dense central core of an atom. It contains protons and neutrons, which are the subatomic particles that make up the majority of an atom's mass. The electrons, on the other hand, orbit around the nucleus in electron shells. Therefore, the nucleus is the correct term to describe the atom's dense central core.Rate this question:
- 4.
Positive ions
Explanation
Cations are positively charged ions. They are formed when an atom loses one or more electrons. Cations play a crucial role in chemical reactions and are attracted to negatively charged ions, called anions, to form ionic compounds. The term "cation" is used to refer to a single positively charged ion, while "cations" is the plural form. Therefore, the given answer "cations, cation" is correct as it includes both the singular and plural forms of the term.Rate this question:
- 5.
Rarely combine with other elements because they already have eight electrons in their outer shells
Explanation
Noble gases rarely combine with other elements because they already have eight electrons in their outer shells. This makes them stable and unlikely to form chemical bonds with other elements. Noble gases have a full outer electron shell, which gives them a high level of stability. Due to this stability, noble gases do not typically react with other elements to form compounds. Therefore, they are known as noble gases.Rate this question:
- 6.
Carry a positive electrical charge
Explanation
Protons are subatomic particles that carry a positive electrical charge. They are found in the nucleus of an atom and are one of the three main particles that make up an atom, along with neutrons and electrons. Protons play a crucial role in determining the atomic number and identity of an element. They are attracted to electrons and help to balance out the negative charge of electrons in an atom, creating a neutral charge overall. Therefore, the answer "protons, proton" accurately describes the particles that carry a positive electrical charge.Rate this question:
- 7.
All atoms seek to have ___ electrons in their outermost shell
Explanation
All atoms seek to have 8 electrons in their outermost shell. This is because having 8 electrons in the outermost shell, also known as the valence shell, makes the atom stable. This stability is achieved by either gaining, losing, or sharing electrons with other atoms through chemical bonding. This concept is known as the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration similar to the noble gases.Rate this question:
- 8.
The substance of the physical world; occupies space; has inertia; cannot be created or destroyed under ordinary conditions; ordinarily exists in three basic states
Explanation
Matter refers to the substance of the physical world that occupies space and has inertia. It cannot be created or destroyed under ordinary conditions. Matter ordinarily exists in three basic states: solid, liquid, and gas. This answer accurately describes the properties and characteristics of matter.Rate this question:
- 9.
The property of resisting changes in motion
Explanation
Inertia refers to the property of resisting changes in motion. It is the tendency of an object to stay at rest or in uniform motion unless acted upon by an external force. This means that an object will continue moving at the same speed and direction, or stay at rest, unless a force is applied to it. Inertia is a fundamental concept in physics and is closely related to Newton's first law of motion.Rate this question:
- 10.
A group of atoms linked together
Explanation
A molecule is a group of atoms that are chemically bonded together. This bond holds the atoms together and forms a stable structure. Molecules can be composed of two or more atoms of the same element or different elements. They can exist in various forms, such as solids, liquids, or gases, and they are the building blocks of all substances. Molecules play a crucial role in chemical reactions and the formation of compounds.Rate this question:
- 11.
"not cuttable"
- 12.
The length of time it takes for 1/2 of the original substance to decay into a new substance
Explanation
The term "half-life" refers to the amount of time it takes for half of the original substance to decay into a new substance. It is a measure of the rate of decay or the time it takes for a substance to lose half of its initial quantity. The concept of half-life is commonly used in fields such as radioactive decay, pharmacology, and chemistry to determine the stability and decay of substances over time.Rate this question:
- 13.
Electrically neutral; has no electrical charge
Explanation
A neutron is electrically neutral, meaning it has no electrical charge. Unlike protons, which have a positive charge, and electrons, which have a negative charge, neutrons do not possess any charge. This lack of charge allows neutrons to interact with other particles without being affected by electromagnetic forces.Rate this question:
- 14.
Quantity of matter the object contains
Explanation
Mass is a measure of the quantity of matter an object contains. It is a fundamental property of an object and is independent of its location. Mass is often measured in kilograms and can be thought of as the amount of material present in an object. It determines the object's inertia and gravitational attraction. The greater the mass of an object, the more difficult it is to accelerate or move. Therefore, mass is the correct answer as it accurately describes the quantity of matter an object possesses.Rate this question:
- 15.
Electric charge of -1/3
Explanation
The given correct answer, "down quark," refers to one of the six types of quarks, which are elementary particles that make up protons and neutrons. The down quark has an electric charge of -1/3, which means it carries a negative charge that is one-third the magnitude of the elementary charge. This charge is important in determining the overall charge of particles that contain down quarks, such as protons and neutrons.Rate this question:
- 16.
The electrons in the outermost shell are known as the _____________
Explanation
Valence electrons are the electrons located in the outermost shell or energy level of an atom. These electrons are involved in chemical reactions and determine the atom's reactivity and ability to form bonds with other atoms. The number of valence electrons also determines the element's position in the periodic table and its chemical properties.Rate this question:
- 17.
The foundation of our understanding of matter
Explanation
The atomic theory of matter is the foundation of our understanding of matter. It states that all matter is composed of tiny particles called atoms, which are indivisible and indestructible. This theory explains various properties and behaviors of matter, such as the conservation of mass, the formation of compounds, and the interactions between atoms. It has been supported by numerous experiments and observations, leading to advancements in fields like chemistry and physics. Overall, the atomic theory of matter provides a fundamental framework for explaining the nature and behavior of all substances in the universe.Rate this question:
- 18.
The process of mixing molecules of one substance through another by random molecular motion
Explanation
Diffusion refers to the process where molecules of one substance mix with another substance through random molecular motion. This occurs as a result of the natural movement of molecules from areas of high concentration to areas of low concentration until equilibrium is reached. The random motion of molecules allows them to spread out and mix with other molecules, leading to diffusion.Rate this question:
- 19.
The number of protons in the nucleus
Explanation
The atomic number refers to the number of protons in the nucleus of an atom. It is a unique identifier for each element on the periodic table. The number of protons determines the element's chemical properties and its position in the periodic table. Therefore, the atomic number is a crucial factor in understanding an element's characteristics and behavior.Rate this question:
- 20.
Can only hold a certain number of electrons
Explanation
The electron shell refers to the specific energy levels or orbitals in an atom where electrons are found. Each electron shell has a maximum capacity to hold a certain number of electrons. This is because electrons are arranged in shells based on their energy levels, with the innermost shell having the lowest energy and the outermost shell having the highest energy. The maximum number of electrons that can be held in each shell depends on the specific shell and its energy level.Rate this question:
- 21.
Water with a definite size and shape
- 22.
Composed of more than one type of atom linked together
Explanation
A compound is composed of more than one type of atom linked together. Compounds are formed when atoms of different elements chemically bond together, creating a new substance with unique properties. In compounds, the atoms are held together by chemical bonds, which can be either ionic or covalent. Compounds can have a fixed ratio of atoms or a variable ratio, and they can exist in solid, liquid, or gaseous states. Examples of compounds include water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2).Rate this question:
- 23.
When an atom develops an electrical charge by losing or gaining electrons
Explanation
An ion is formed when an atom either loses or gains electrons, resulting in the development of an electrical charge. This occurs because electrons have a negative charge, so when an atom loses electrons, it becomes positively charged, while gaining electrons results in a negative charge. Ions are important in various chemical reactions and play a crucial role in the formation of compounds. They can also be found in various states, such as in solution or in the form of crystals.Rate this question:
- 24.
A unique abbreviation for each element based on either the common name or the Latin name
Explanation
The chemical symbol is a unique abbreviation for each element based on either the common name or the Latin name. It is a shorthand representation used to identify elements in the periodic table and chemical formulas. Each element is assigned a specific symbol, usually consisting of one or two letters. These symbols are widely recognized and used in scientific literature and chemical equations to denote the presence of specific elements in compounds or reactions.Rate this question:
- 25.
The random motion of microscopic particles that puzzled scientists for many years
Explanation
Brownian motion refers to the random movement of microscopic particles, such as pollen grains or dust particles, in a fluid medium, such as water or air. This phenomenon was first observed by the botanist Robert Brown in 1827, who noticed the erratic motion of pollen grains suspended in water. The explanation for Brownian motion came later, with Albert Einstein's work in 1905, which demonstrated that the motion is caused by the continuous bombardment of fluid molecules on the particles. This discovery had a significant impact on the development of the kinetic theory of matter and provided evidence for the existence of atoms and molecules.Rate this question:
- 26.
Negative ions
Explanation
Anions are negatively charged ions. They are formed when an atom gains one or more electrons. Anions play a crucial role in various chemical reactions and are often involved in the formation of compounds. They are attracted to positively charged ions, known as cations, creating a balanced electrical charge in a compound. Anions are essential in maintaining the overall charge neutrality and stability of many substances. Therefore, the correct answer for this question is anions or anion, which refers to negatively charged ions.Rate this question:
- 27.
The most familiar model of the atom, made by the German physicist Neils Bohr
Explanation
The given correct answer refers to the most familiar model of the atom, which was developed by the German physicist Neils Bohr. The Bohr model proposes that electrons orbit the nucleus in specific energy levels or shells, and that the electrons can jump between these levels by absorbing or emitting energy. This model was a significant advancement in understanding atomic structure and helped explain phenomena such as the emission and absorption of light. The Bohr model laid the foundation for further developments in quantum mechanics and atomic theory.Rate this question:
- 28.
Any substance that is unstable
Explanation
The term "radioactive" refers to any substance that is unstable and undergoes spontaneous decay, emitting radiation in the process. These substances have an unstable nucleus that releases energy in the form of radiation to achieve a more stable state. This emission of radiation can have various effects on living organisms and the environment, making radioactive substances potentially hazardous. Therefore, the term "radioactive" accurately describes any substance that is unstable and exhibits this behavior.Rate this question:
- 29.
The nucleus splits into several pieces in a process called ___________ releasing an enormous amount of heat as well as gamma rays
Explanation
Nuclear fission is a process in which the nucleus of an atom splits into several smaller pieces. This process releases a significant amount of heat and gamma rays. It is a chain reaction where one atom splits, releasing energy and additional neutrons that can then go on to split other atoms. This process is used in nuclear power plants to generate electricity and in nuclear weapons to release a massive amount of energy in the form of an explosion.Rate this question:
- 30.
The first group on the periodic table of the elements; very soft, shiny metals with low melting points
Explanation
Alkali metals are the first group on the periodic table of elements. They are characterized by being very soft, shiny metals with low melting points. This group includes elements such as lithium, sodium, and potassium. Alkali metals are highly reactive and easily lose their outermost electron to form positive ions. They are known for their ability to react vigorously with water and oxygen.Rate this question:
- 31.
Group IIA; all have two electrons in their outer shell
Explanation
The correct answer is "alkaline earth metals" and "alkaline earth metal". This is because Group IIA elements in the periodic table, such as beryllium, magnesium, calcium, strontium, barium, and radium, all have two electrons in their outer shell. These elements are commonly referred to as alkaline earth metals, and each individual element in this group is referred to as an alkaline earth metal.Rate this question:
- 32.
One-way diffusion through a semipermeable membrane
Explanation
Osmosis is the process of one-way diffusion through a semipermeable membrane. In osmosis, solvent molecules move from an area of lower solute concentration to an area of higher solute concentration, in order to equalize the concentration on both sides of the membrane. This movement of solvent molecules through the membrane allows for the balance of solute concentrations and the maintenance of osmotic pressure.Rate this question:
- 33.
Tiny particles such as elections do not absorb or release energy in a smooth flow, rather it is always absorbed or released in a discrete packet or quantum
Explanation
The answer "quantum" is correct because it refers to the discrete packets of energy that tiny particles such as electrons absorb or release. This concept is a fundamental principle in quantum mechanics, which states that energy is quantized and can only exist in specific amounts or levels. It explains why energy is not absorbed or released in a smooth, continuous flow, but rather in distinct and discrete units called quanta.Rate this question:
- 34.
Molecules of matter are in constant motion
Explanation
The kinetic theory of matter states that molecules of matter are in constant motion. This means that the particles that make up matter are always moving, even if they are not visible to the naked eye. This motion is what gives matter its physical properties, such as its temperature and pressure. The kinetic theory of matter helps to explain many phenomena, such as the expansion of gases when heated and the behavior of liquids and solids. It is a fundamental concept in understanding the behavior and properties of matter.Rate this question:
- 35.
Electric charge of +2/3
Explanation
The given correct answer, "up quark," refers to one of the six types of quarks, which are elementary particles that make up protons and neutrons. The up quark has an electric charge of +2/3, indicating that it carries a positive charge that is two-thirds the magnitude of the elementary charge. This charge value is specific to the up quark and distinguishes it from other types of quarks, such as the down quark, which has an electric charge of -1/3.Rate this question:
- 36.
"little neutral one" and interesting and puzzling subatomic particle that is related to the election but has no electric charge and little mass
Explanation
Neutrinos are subatomic particles that are related to the electron but have no electric charge and very little mass. They are often referred to as "little neutral ones" because they have no charge and are very small. The term "electron neutrino" specifically refers to a type of neutrino that is associated with the electron.Rate this question:
- 37.
Small particles of matter that make up atoms
Explanation
The given answer, "subatomic particles" or "subatomic particle," accurately describes small particles of matter that make up atoms. Subatomic particles are the building blocks of atoms and include particles such as protons, neutrons, and electrons. These particles are smaller than atoms and are essential in understanding the structure and behavior of matter at the atomic level.Rate this question:
- 38.
Average mass of all the various isotopes of an element
Explanation
The atomic mass refers to the average mass of all the various isotopes of an element. Isotopes are atoms of the same element that have different numbers of neutrons in their nucleus. Since different isotopes have different masses, the atomic mass is calculated by taking into account the abundance of each isotope and its mass. Therefore, the atomic mass represents the average mass of all the isotopes of an element.Rate this question:
- 39.
"domino effect"
Explanation
The term "domino effect" refers to a chain reaction where one event triggers a series of similar events. In this context, "chain reaction" is synonymous with the domino effect, as it implies that one action leads to a sequence of subsequent actions. Therefore, the correct answer is "chain reaction."Rate this question:
- 40.
Caused at least 32 deaths and exposed many people to large amounts of radiation in a nuclear plant in _____________, Ukraine
Explanation
The given correct answer for this question is "Chernobyl" because it is the name of the place where a nuclear plant disaster occurred, resulting in at least 32 deaths and exposing many people to high levels of radiation. The question is asking for the location of the nuclear plant accident, and Chernobyl is the correct answer.Rate this question:
- 41.
A table of elements arranged by atomic number and valence
Explanation
The correct answer is "periodic table of the elements" because it accurately describes a table that organizes the elements based on their atomic number and valence. The periodic table is a fundamental tool in chemistry that allows scientists to understand the relationships between different elements and predict their chemical behavior. It provides a systematic arrangement of the elements, with rows called periods and columns called groups, which helps in identifying patterns and trends in their properties.Rate this question:
- 42.
"salt formers"
Explanation
Halogens are known as "salt formers" because they readily react with metals to form salts. They have a high electronegativity, which allows them to attract electrons from other atoms and form ionic bonds. This property makes them highly reactive and capable of forming various compounds, including salts, with metals. Therefore, halogens are commonly referred to as "salt formers" in chemistry.Rate this question:
- 43.
Small particles that make up neutrons
Explanation
Quarks are the small particles that make up neutrons. Neutrons are composed of three quarks: two down quarks and one up quark. These quarks are bound together by the strong nuclear force, which is one of the fundamental forces in nature. Quarks are elementary particles and cannot exist in isolation, but they combine to form larger particles such as protons and neutrons. Therefore, quarks are the correct answer to the given question.Rate this question:
- 44.
Electron shells
Explanation
The term "energy levels" refers to the different states of energy that electrons can occupy within an atom. Electrons are arranged in specific energy levels or shells around the nucleus of an atom. These energy levels are represented by whole numbers (n=1, n=2, etc.) and each level has a maximum number of electrons it can hold. The electrons in an atom can move between energy levels by gaining or losing energy. Therefore, the term "energy levels" is a more accurate description of the arrangement of electrons in an atom compared to "electron shells".Rate this question:
- 45.
Consists of electromagnetic waves of extremely high frequency and energy
Explanation
Gamma radiation consists of electromagnetic waves of extremely high frequency and energy. It is a type of ionizing radiation that is highly penetrating and can cause damage to living cells. Gamma radiation is typically emitted during radioactive decay or nuclear reactions. It is used in various fields such as medicine, industry, and research, but excessive exposure to gamma radiation can be harmful to human health.Rate this question:
- 46.
The process of combining two nuclei to form a heavier nucleus and thereby releasing much energy
Explanation
Nuclear fusion refers to the process of combining two nuclei to form a heavier nucleus, resulting in the release of a significant amount of energy. This process is responsible for the immense energy produced by stars, including our sun. Through the fusion of atomic nuclei, such as hydrogen atoms, into helium, a substantial amount of energy is released, making nuclear fusion a promising potential source of clean and abundant energy for the future.Rate this question:
- 47.
A group of 30 metals beneath the main body; all have two electrons in their outer shells and share similar properties
Explanation
The correct answer is "inner transitive metals" or "inner transitive metal". This term refers to a group of metals located beneath the main body of the periodic table. These metals have two electrons in their outer shells and share similar properties. The term "inner transitive" indicates their position within the periodic table and their ability to transition between different oxidation states.Rate this question:
- 48.
Schrodinger's hypothesis; explained some puzzling features of atomic structure
Explanation
The wave-mechanical model is the correct answer because it is a theory that was developed by Schrodinger to explain the behavior of particles at the atomic level. This model incorporates the wave-particle duality of matter, which means that particles can exhibit both wave-like and particle-like properties. Schrodinger's hypothesis, which is part of the wave-mechanical model, helped to clarify some of the perplexing aspects of atomic structure that were not adequately explained by previous models.Rate this question:
- 49.
It is impossible to measure the position and velocity of an electron simultaneously
Explanation
The Heisenberg uncertainty principle states that it is impossible to measure both the position and velocity of an electron simultaneously with perfect accuracy. This principle arises from the wave-particle duality of quantum mechanics, where particles like electrons can behave as both particles and waves. When trying to measure the position of an electron, the act of measurement disturbs its velocity, and vice versa. Therefore, there will always be an inherent uncertainty in the simultaneous measurement of these two properties.Rate this question:
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