Chemistry Unit 1 Practice Test Questions And Answers

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With 11 years of urban teaching, Daniel excels as a STEM club teacher, demonstrating expertise in curriculum design, differentiated instruction for IEPs, and adept use of Google Classroom. His commitment to education shines through in his impactful contributions to STEM learning. Daniel holds an MSEd in Science Education from The City College of New York and a BA in History from Binghamton University. With certifications in Special Education and Biology, he is dedicated to curriculum development and enhancing educational experiences for students. He is currently working as a Special Education Teacher at NYC Department of Education.
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Chemistry Unit 1 Practice Test Questions And Answers - Quiz

Try this awesome “Chemistry Unit 1 Practice Test Questions And Answers" quiz and let's see how well-versed you are in chemistry. The quiz is made to test your understanding of the fundamental concepts of chemistry. If you have a serious chemistry exam, test your knowledge and prepare well with this quiz!


Questions and Answers
  • 1. 

    What is chemistry? 

    • A.

      The branch of science concerned with the nature and properties of matter and energy

    • B.

      The study of living organisms, divided into many specialized fields.

    • C.

      The science that deals with materials of the universe and the changes that these materials undergo

    • D.

      The intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural phenomenons.

    Correct Answer
    C. The science that deals with materials of the universe and the changes that these materials undergo
    Explanation
    Chemistry is the science that deals with materials of the universe and the changes that these materials undergo. It involves studying the composition, properties, and behavior of substances, as well as the transformations they undergo during chemical reactions. Chemistry plays a crucial role in understanding and explaining various natural phenomena and is essential in fields such as medicine, industry, and environmental science.

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  • 2. 

    Wood burning in air, forming water, carbon dioxide, and other substances is a form of chemistry. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Wood burning in air is a chemical reaction known as combustion. During this process, the wood reacts with oxygen in the air to produce water, carbon dioxide, and other substances. This reaction involves the breaking and forming of chemical bonds, which is a fundamental concept in chemistry. Therefore, wood burning in air can be considered a form of chemistry.

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  • 3. 

    What are the steps to the scientific method? 

  • 4. 

    What is a theory? 

    • A.

      Something that is witnessed and can be recorded.

    • B.

      An interpretation, or a possible explanation of why nature behaves in a particular way.

    • C.

      A statement that summarizes generally observed behavior.

    • D.

      A possible explanation for an observation.

    Correct Answer
    B. An interpretation, or a possible explanation of why nature behaves in a particular way.
    Explanation
    A theory is an interpretation or a possible explanation of why nature behaves in a particular way. It goes beyond simply recording observations and summarizes generally observed behavior. The other options do not capture the essence of a theory as they either focus on witnessing and recording or provide a more limited scope of explanation.

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  • 5. 

    What is matter? 

    • A.

      Something that has mass and occupies space.

    • B.

      Fundamental unit of which elements are made.

    • C.

      Substances that contain only one type of atom.

    • D.

      Substances that are made by bonding atoms together in a specific way.

    Correct Answer
    A. Something that has mass and occupies space.
    Explanation
    Matter refers to anything that contains mass and occupies space. This definition encompasses all physical substances and objects that we can perceive. Matter can exist in various forms, such as solids, liquids, and gases. It is composed of atoms and molecules, which are the fundamental units of matter. By stating that matter has mass and occupies space, we can understand that it is tangible and takes up a certain amount of physical space.

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  • 6. 

    What are compounds?

    • A.

      Elements that cannot be broken down into simpler substances.

    • B.

      Substances made up of two or more different elements chemically combined in fixed ratios.

    • C.

      Chemical reactions that produce energy.

    • D.

      Pure substances with a uniform composition.

    Correct Answer
    B. Substances made up of two or more different elements chemically combined in fixed ratios.
    Explanation
    Compounds are substances formed when two or more different elements chemically combine in fixed ratios. In a compound, the elements lose their individual properties and create a new substance with distinct characteristics. This is a fundamental concept in chemistry.

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  • 7. 

    What are elements?

    • A.

      Substances made up of two or more different elements chemically combined in fixed ratios.

    • B.

      Pure substances with a uniform composition.

    • C.

      The smallest particles of matter.

    • D.

      Fundamental substances that cannot be broken down into simpler substances by chemical means.

    Correct Answer
    D. Fundamental substances that cannot be broken down into simpler substances by chemical means.
    Explanation
    Elements are fundamental substances that cannot be further broken down into simpler substances by chemical means. Each element is characterized by its unique properties, and elements are the basic building blocks of matter.

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  • 8. 

    Check the 3 different states of matter. 

    • A.

      Solid

    • B.

      Water

    • C.

      Liquid

    • D.

      Blood

    • E.

      Gas

    Correct Answer(s)
    A. Solid
    C. Liquid
    E. Gas
    Explanation
    The given answer correctly identifies the three different states of matter: solid, liquid, and gas. Solids have a fixed shape and volume, liquids have a fixed volume but take the shape of their container, and gases have neither a fixed shape nor volume and expand to fill their container. The examples provided, water and blood, are both liquids but are not states of matter.

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  • 9. 

    A chemical property is a characteristic that describes the ability of a substance to change to a different substance. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A chemical property refers to the ability of a substance to undergo a chemical change and form a new substance. It describes the behavior of a substance when it interacts with other substances, such as its ability to react with acids or undergo combustion. This is different from a physical property, which describes the characteristics of a substance that can be observed without changing its chemical composition.

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  • 10. 

    Describe some different physical and chemical properties. 

  • 11. 

    What is a mixture? 

    • A.

      A substance without variable composition

    • B.

      A substance with variable composition

    Correct Answer
    B. A substance with variable composition
    Explanation
    A mixture is a substance with variable composition. This means that a mixture is made up of two or more substances that are combined together, but they can be present in different proportions. The composition of a mixture can be changed by adding or removing one or more of its components. This is in contrast to a substance without variable composition, which would have a fixed and consistent composition.

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  • 12. 

    An alloy is a mixture of elements that have a metallic property. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
     An alloy is a mixture of elements that have a metallic property. When different metals are combined together, they form a new material with enhanced properties such as increased strength, durability, and resistance to corrosion. Alloys are commonly used in various industries, including construction, automotive, and aerospace, to create materials that possess specific characteristics required for specific applications.

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  • 13. 

    A pure substance is a...

    • A.

      Pure element or pure compound

    • B.

      A mixture of elements

    • C.

      A mixture of atoms

    • D.

      Nitrogen.

    Correct Answer
    A. Pure element or pure compound
    Explanation
    A pure substance refers to a substance that is made up of only one type of element or compound. It does not contain any other substances or impurities. In this case, the correct answer is "Pure element or pure compound" because a pure substance can be either a single element or a compound composed of multiple elements that are chemically bonded together.

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  • 14. 

    What is the difference between a homogeneous and a heterogeneous mixture? 

  • 15. 

    What is filtration? 

    • A.

      A separation process that depends on the boiling points of the substances

    • B.

      An agent that is used to distillate water

    • C.

      Separation of a solid from a liquid by using filter paper

    • D.

      Desalination

    Correct Answer
    C. Separation of a solid from a liquid by using filter paper
    Explanation
    Filtration is a process used to separate a solid from a liquid by using filter paper. This method takes advantage of the different particle sizes between the solid and the liquid. The mixture is poured through the filter paper, which acts as a barrier, allowing the liquid to pass through while trapping the solid particles. This process is commonly used in laboratories and industries to remove impurities or separate components from a mixture.

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  • 16. 

    What is the element symbol for fluorine?

    • A.

      Fl

    • B.

      Fo

    • C.

      Fe

    • D.

      F

    Correct Answer
    D. F
    Explanation
    The element symbol for fluorine is F. Fluorine is a non-metallic element with the atomic number 9, and it belongs to the halogen group in the periodic table.

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  • 17. 

    What is the law of constant composition?

    • A.

      A given compound always contains elements in exactly the same proportion by mass

    • B.

      The fact that a substance made of two or more different elements joined together in a specific way is called a compound

    • C.

      Elements are made up of tiny particles called atoms

    Correct Answer
    A. A given compound always contains elements in exactly the same proportion by mass
    Explanation
    The law of constant composition states that a given compound will always contain the elements in the same proportion by mass. This means that regardless of the amount or source of the compound, the ratio of the elements will remain constant. This law is a fundamental principle in chemistry and helps to determine the chemical formula and properties of compounds. It also allows for the prediction of the mass of each element in a compound based on its chemical formula.

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  • 18. 

    J.J Thompson found what neutrons were. 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Neutrons were discovered by James Chadwick in 1932, several years after Thompson's work. Thompson is known for his discovery of the electron and his work on the nature of cathode rays.

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  • 19. 

    Isotopes are...

    • A.

      The number of protons in the nucleus of a given atom

    • B.

      The total number of protons and neutrons in the nucleus of a given atom

    • C.

      Atoms with the same number of protons but different number of neutrons

    • D.

      The number of electrons in the nucleus of a given atom

    Correct Answer
    C. Atoms with the same number of protons but different number of neutrons
    Explanation
    Isotopes are variations of a chemical element that have the same number of protons (which defines the element) but different numbers of neutrons in their nuclei. This difference in neutron number results in isotopes having the same atomic number but different atomic masses. For example, carbon-12 and carbon-14 are both isotopes of carbon; both have 6 protons, but carbon-12 has 6 neutrons, while carbon-14 has 8 neutrons.

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  • 20. 

    In the periodic table, the following groups exist

    • A.

      Alkaline

    • B.

      Alkali

    • C.

      Helenogens

    • D.

      Halogens

    • E.

      Ignoble Gases

    • F.

      Noble Gases

    Correct Answer(s)
    A. Alkaline
    B. Alkali
    D. Halogens
    F. Noble Gases
    Explanation
    The alkaline group consists of elements in Group 2, such as calcium and magnesium. The alkali group consists of elements in Group 1, such as sodium and potassium. The halogens are found in Group 17 and include elements like fluorine and chlorine. The noble gases are located in Group 18 and include elements like helium and neon.

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  • 21. 

    What properties of elements are considered when arranging elements in the periodic table? 

    • A.

      Whether they are metals or non-metals.

    • B.

      Atomic number

    • C.

      What group of elements do they belong to

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Elements are arranged in the periodic table based on their properties such as whether they are metals or nonmetals, their atomic number, and the group of elements they belong to. The classification of elements as metals or nonmetals helps in understanding their physical and chemical properties. The atomic number determines the number of protons in the nucleus of an atom and provides information about the element's position in the periodic table. The element group they belong to indicates their similar chemical behavior and properties due to the same number of valence electrons.

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  • 22. 

    The four physical properties of metals include...

    • A.

      Efficient conduction of heat and electricity

    • B.

      Ability to be eaten (edible)

    • C.

      Malleability (can be hammered into thin sheets)

    • D.

      Ability to change in state of matter

    • E.

      Lacking shininess (luster)

    • F.

      A lustrous appearance

    • G.

      Ductility (can be pulled into thin wires)

    Correct Answer(s)
    A. Efficient conduction of heat and electricity
    C. Malleability (can be hammered into thin sheets)
    F. A lustrous appearance
    G. Ductility (can be pulled into thin wires)
    Explanation
    The correct answer includes the properties of efficient conduction of heat and electricity, malleability (ability to be hammered into thin sheets), a lustrous appearance, and ductility (ability to be pulled into thin wires). These properties are commonly observed in metals and distinguish them from other materials. Metals have high thermal and electrical conductivity due to the mobility of their free electrons. They can be easily shaped and flattened into thin sheets, and they have a shiny, reflective surface. Additionally, metals can be drawn into thin wires without breaking, showing their ductility.

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  • 23. 

    A diatomic molecule is a molecule that consists of three atoms. 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    A diatomic molecule is a molecule that consists of two atoms, not three. 

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  • 24. 

    Describe what cations, anions, and ions are in general. 

    • A.

      Cations are positive, anions are negative, and ions are charged particles.

    • B.

      Cations are negative, anions are positive, and ions are charged particles.

    • C.

      Cations are neutral, anions are positive, and ions are negative.

    • D.

      Cations and anions are positive, and ions are negative. 

    Correct Answer
    A. Cations are positive, anions are negative, and ions are charged particles.
    Explanation
    Cations are positively charged ions formed when an atom loses electrons. Anions are negatively charged ions formed when an atom gains electrons. Ions, in general, are charged particles that can be either positively charged (cations) or negatively charged (anions) depending on the electron exchange during chemical reactions.

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  • 25. 

    Chemical compounds must have a ______ charge

    • A.

      Positive

    • B.

      Negative

    • C.

      Neutral

    Correct Answer
    C. Neutral
    Explanation
    Chemical compounds must have a neutral charge because they are formed by the combination of positively charged ions (cations) and negatively charged ions (anions). The positive and negative charges cancel each other out, resulting in a compound that has no overall charge. This is important for the stability and reactivity of the compound, as a neutral charge allows it to interact with other compounds and participate in chemical reactions.

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  • 26. 

    A binary ionic compound is a two-element compound consisting of an anion and a cation. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A binary ionic compound is formed when two elements combine, with one element donating electrons to become a positively charged cation, and the other element accepting those electrons to become a negatively charged anion. This combination of oppositely charged ions results in a stable compound. 

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  • 27. 

    What is scientific notation? 

    • A.

      A number expressed as a product of a number between 1 and 10 and the approximate power of 10.

    • B.

      It is the notation of science

    Correct Answer
    A. A number expressed as a product of a number between 1 and 10 and the approximate power of 10.
    Explanation
    Scientific notation is a way of expressing numbers that are very large or very small. It involves writing a number as a product of a number between 1 and 10 and a power of 10. This allows for easier representation of numbers with a large number of digits, making calculations and comparisons more manageable.

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  • 28. 

    Units are the part of the measurement telling us the scale being used

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Units provide information about the scale or magnitude being used to quantify a particular quantity. Without units, measurements would be meaningless, and it would be impossible to compare or understand the values being measured. Units allow us to communicate and interpret measurements accurately, making them an essential component of any measurement system.

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  • 29. 

    Significant figures are the certain digits and the last uncertain digit of a measurement

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
     Significant figures are the certain digits and the first uncertain digit of a measurement. Significant figures are the digits in a number that carry meaningful information about its precision and accuracy. They include all the certain digits and one uncertain digit.

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  • 30. 

    A conversion factor is 

    • A.

      The relationship between inches and centimeters

    • B.

      The proportion that is used to measure the ratios of food

    • C.

      A ratio used to convert from one unit to another

    • D.

      The process of using conversion factors to change from one unit to another

    Correct Answer
    C. A ratio used to convert from one unit to another
    Explanation
    Conversion factors are ratios used to convert from one unit to another. They provide a mathematical relationship between different units of measurement, allowing for accurate and consistent conversions. By multiplying or dividing by the appropriate conversion factor, one can easily convert measurements from one unit to another. This ensures that measurements are standardized and can be easily understood and compared across different systems of measurement.

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  • 31. 

    The absolute scale of temperature is

    • A.

      Kelvin scale

    • B.

      Celsius scale

    • C.

      Fahrenheit scale

    Correct Answer
    A. Kelvin scale
    Explanation
    The Kelvin scale is the absolute scale of temperature because it is based on the absolute zero point, which is the lowest possible temperature. Absolute zero is defined as 0 Kelvin, where all molecular motion ceases. The Kelvin scale is used in scientific and engineering applications where precise temperature measurements are required, as it allows for direct comparison and calculation of temperature differences without the need for negative values. 

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  • 32. 

    In order to convert from Celsius to Kelvin degrees, one must add 200 degrees to the Celsius figure. 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is incorrect. To convert from Celsius to Kelvin, one must add 273.15 degrees to the Celsius figure.

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  • 33. 

    Describe what density is

    Correct Answer
    Density is the mass of a substance per a given volume of that substance
    Explanation
    Density is a physical property that measures how much mass is contained within a given volume of a substance. It is calculated by dividing the mass of the substance by its volume. A higher density indicates that a substance is more compact or tightly packed, while a lower density suggests that it is less compact or more spread out. Density is commonly used to identify and compare different materials, as substances with different densities will exhibit different behaviors and properties.

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  • 34. 

    What is the chemical formula of the phosphate ion?

    Correct Answer
    PO4-, PO4
    Explanation
    The chemical formula of the phosphate ion is PO4-. Phosphate is an inorganic chemical compound that consists of one phosphorus atom bonded to three oxygen atoms. The negative charge on the ion indicates that it has gained three electrons, giving it a total of four negative charges. The formula PO4- represents this arrangement of atoms and charge.

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  • 35. 

    Chemical formula for hydroxide ion.

    Correct Answer
    OH-
    Explanation
    The chemical formula for hydroxide ion is OH-. The hydroxide ion consists of one oxygen atom bonded to one hydrogen atom, and it carries a negative charge. This ion is commonly found in many chemical compounds, such as bases and alkalis. It is known for its ability to accept a proton, making it a strong base. The hydroxide ion is an essential component in various chemical reactions and plays a crucial role in determining the pH of a solution.

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  • 36. 

    What is the chemical formula for cesium oxide?

    Correct Answer
    Cs2O
    Explanation
    Cesium oxide is represented by the chemical formula Cs2O. The Cs indicates the presence of cesium, which is a highly reactive alkali metal. The 2 subscript indicates that there are two cesium atoms in the compound. The O indicates the presence of oxygen, a non-metal.  Cesium donates one electron to oxygen, and two cesium ions cancel out the -2 charge of the oxygen ion.

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  • 37. 

    What is the chemical formula of Barium oxide?

    Correct Answer
    BaO
    Explanation
    Barium oxide is represented by the chemical formula BaO. This compound consists of one barium atom (Ba) and one oxygen atom (O) bonded together. Barium oxide is an ionic compound, where the barium atom donates two electrons to the oxygen atom, resulting in the formation of a stable ionic bond. The formula BaO indicates that there is a one-to-one ratio of barium to oxygen atoms in the compound.

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  • 38. 

    What is the chemical formula for scandium oxide?

    Correct Answer
    Sc2O
    Explanation
    Scandium oxide is composed of two scandium atoms bonded to one oxygen atom, hence the chemical formula Sc2O. The subscript 2 indicates that there are two scandium atoms present in the compound, while the absence of a subscript for oxygen implies that there is only one oxygen atom. Two scandium ions with a +1 charge is required to cancel out the -2 charge of the oxygen ion.

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  • 39. 

    What is the chemical formula for the nitrite ion?

    Correct Answer
    NO2-
    Explanation
    The chemical formula for the nitrite ion is NO2-.

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  • 40. 

    What is the formula for a carbonate ion?

    Correct Answer
    CO3 2-
    Explanation
    The formula for a carbonate ion is CO3 2-. This ion consists of one carbon atom bonded to three oxygen atoms. The 2- charge indicates that the ion has gained two electrons, resulting in a negative charge.

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  • 41. 

    What is the chemical formula for the nitrate ion?

    Correct Answer
    NO3-
    Explanation
    The chemical formula for the nitrate ion is NO3-. The nitrate ion consists of one nitrogen atom (N) and three oxygen atoms (O), with a charge of -1. This means that the nitrogen atom donates one electron to form a negative charge, while the oxygen atoms accept one electron each. The negative charge on the nitrate ion indicates that it has gained one electron and is therefore negatively charged.

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Daniel P |MSEd (Science Education) |
Science Education
With 11 years of urban teaching, Daniel excels as a STEM club teacher, demonstrating expertise in curriculum design, differentiated instruction for IEPs, and adept use of Google Classroom. His commitment to education shines through in his impactful contributions to STEM learning. Daniel holds an MSEd in Science Education from The City College of New York and a BA in History from Binghamton University. With certifications in Special Education and Biology, he is dedicated to curriculum development and enhancing educational experiences for students. He is currently working as a Special Education Teacher at NYC Department of Education.

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