Chemistry Basics Quiz
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Questions and Answers

What is a characteristic of physical changes?

  • They change the state of a substance. (correct)
  • They are irreversible.
  • They involve a reaction between two reactants.
  • They result in the formation of a new substance.

    • What constitutes the reactants in a chemical reaction?

  • The evidence observed during a reaction.
  • The new materials created after the reaction.
  • The materials present at the end of a reaction.
  • The substances involved before the reaction occurs. (correct)

    • Which of the following is NOT evidence of a chemical reaction?

  • Color change
  • Formation of gas bubbles
  • Change in shape (correct)
  • Change in temperature

    • How does salting preserve food?

    <p>By removing water through osmosis.</p> Signup and view all the answers

    What is the role of beneficial bacteria in fermentation?

    <p>To produce lactic acid as a preservative.</p> Signup and view all the answers

    What type of locations primarily use the WHMIS safety symbols?

    <p>Laboratories and industrial workplaces</p> Signup and view all the answers

    Which of the following correctly describes the main purpose of WHMIS?

    <p>To ensure standardization in handling hazardous chemicals in workplaces</p> Signup and view all the answers

    What shape and color is used to indicate the highest hazard level in HSHS?

    <p>Red octagon</p> Signup and view all the answers

    How many safety symbols are in the HSHS system?

    <p>3</p> Signup and view all the answers

    What do the symbols in WHMIS primarily indicate?

    <p>The degree and type of chemical hazards</p> Signup and view all the answers

    Which of the following is NOT a component included in Material Safety Data Sheets (MSDS)?

    <p>Marketing strategies</p> Signup and view all the answers

    What is the meaning of the orange diamond in the HSHS system?

    <p>Moderate hazard level</p> Signup and view all the answers

    What does the yellow inverted triangle symbolize in the HSHS system?

    <p>Lowest hazard level</p> Signup and view all the answers

    What is the primary purpose of the scientific method in relation to hypotheses?

    <p>To test hypotheses by making predictions about experiments</p> Signup and view all the answers

    Which of the following best describes qualitative observations?

    <p>Describing the physical changes in color or state</p> Signup and view all the answers

    What type of knowledge does the observation of a burning magnesium ribbon represent?

    <p>Empirical knowledge based on observable phenomena</p> Signup and view all the answers

    Which of the following is NOT a physical property of a substance?

    <p>Reactivity with acids</p> Signup and view all the answers

    What process is characterized by a change in size, shape, or state while retaining physical properties?

    <p>Physical change</p> Signup and view all the answers

    How would you classify the observation that magnesium burns with a bright white light?

    <p>Qualitative observation describing a quality of matter</p> Signup and view all the answers

    Which of the following properties indicates a substance's ability to dissolve in water?

    <p>Solubility</p> Signup and view all the answers

    Which term describes the ability of a substance to be drawn into wires without breaking?

    <p>Ductility</p> Signup and view all the answers

    What is the definition of combustion?

    <p>The ability to burn, producing flame, heat, and light.</p> Signup and view all the answers

    Which statement correctly describes a pure substance?

    <p>It contains only one type of particle with uniform properties.</p> Signup and view all the answers

    At what point is a substance likely to ignite, known as its 'flash point'?

    <p>The specific temperature required to initiate combustion.</p> Signup and view all the answers

    How does a reaction with acids typically manifest?

    <p>Through bubbling or fizzing due to gas formation.</p> Signup and view all the answers

    What distinguishes a colloid from a solution?

    <p>Colloids have larger particles that can be seen without magnification, while solutions do not.</p> Signup and view all the answers

    What is one characteristic of a suspension?

    <p>It contains parts that are visible and can settle out.</p> Signup and view all the answers

    Which option describes a mechanical mixture?

    <p>A combination of different substances that can be easily seen.</p> Signup and view all the answers

    What principle is maintained during both physical and chemical changes?

    <p>Conservation of mass.</p> Signup and view all the answers

    What does it mean for an atom to become an ion?

    <p>It has gained or lost electrons.</p> Signup and view all the answers

    Which statement correctly describes the octet rule?

    <p>Atoms tend to react to achieve a full outer energy level.</p> Signup and view all the answers

    In reference to isotopes, what is the defining characteristic?

    <p>Same number of protons but different mass numbers.</p> Signup and view all the answers

    What is the significance of multivalent elements in ion formation?

    <p>They can lose multiple electrons to form stable ions.</p> Signup and view all the answers

    Why is the atomic mass of nitrogen listed as 14.01 amu in the periodic table?

    <p>It accounts for the average mass of isotopes.</p> Signup and view all the answers

    Which of the following elements would be most likely to react to achieve stability?

    <p>Fluorine with 7 valence electrons.</p> Signup and view all the answers

    How is the atomic mass unit (amu) defined?

    <p>Relative to an atom of carbon-12.</p> Signup and view all the answers

    What happens to an atom's charge when it gains two electrons?

    <p>It becomes negatively charged.</p> Signup and view all the answers

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