Chemistry Quiz
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Questions and Answers

Which of the following best describes an isotope?

  • An atom with a different number of protons than electrons
  • An atom with a different number of neutrons than protons (correct)
  • An atom with a different number of electrons than protons
  • An atom with a different number of protons than neutrons

    • Which of the following is an example of an endothermic reaction?

  • Freezing of water
  • Burning of wood
  • Baking a cake
  • Mixing vinegar and baking soda (correct)

    • What is the half-life of a radioactive substance?

  • The time it takes for half of the radioactive substance to decay (correct)
  • The time it takes for all of the radioactive substance to decay
  • The time it takes for the radioactive substance to undergo a chemical reaction
  • The time it takes for the radioactive substance to become stable

    • Which of the following best describes an isotope?

    <p>An atom with a different number of protons than neutrons</p> Signup and view all the answers

    What is the main difference between endothermic and exothermic reactions?

    <p>Endothermic reactions absorb heat from their surroundings, while exothermic reactions release heat to their surroundings</p> Signup and view all the answers

    What is the process by which a radioactive substance undergoes spontaneous decay and emits radiation?

    <p>Radioactive decay</p> Signup and view all the answers

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