Chemical Reactions Quiz

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Questions and Answers

Which of the following is an example of a chemical change?

  • Dissolving salt in water
  • Boiling of water
  • Rusting of iron (correct)
  • Melting of ice

What is the role of a catalyst in a chemical reaction?

  • Stops the reaction from occurring
  • Changes the nature of the reactants
  • Decreases the rate of reaction
  • Speeds up the reaction without being used up (correct)

Which statement best describes an exothermic reaction?

  • It absorbs heat from the surroundings
  • It always results in a decrease in temperature
  • It releases heat to the surroundings (correct)
  • It has no effect on the temperature

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