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Questions and Answers
Which of the following best describes an isotope?
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?
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?
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?
Which of the following best describes an isotope?
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What is the main difference between endothermic and exothermic reactions?
What is the main difference between endothermic and exothermic reactions?
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What is the process by which a radioactive substance undergoes spontaneous decay and emits radiation?
What is the process by which a radioactive substance undergoes spontaneous decay and emits radiation?
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