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Questions and Answers
Which of the following is an example of a chemical change?
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?
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?
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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