Physical and Chemical Changes Quiz
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5 questions, one answer each
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1. Which of these is an example of a physical change?
- A. Burning paper
- B. Rusting iron
- C. Melting wax
- D. Baking a cake
2. What is the key feature of a chemical change?
- A. It is always reversible
- B. One or more new substances are formed
- C. No energy change occurs
- D. It only happens to gases
3. Which method could be used to measure the rate of a reaction that produces a gas?
- A. Measuring the colour of the solution only
- B. Measuring the volume of gas produced over time using a gas syringe
- C. Measuring the temperature of the room
- D. Weighing the reactants before mixing only
4. A reaction is repeated at a higher temperature, all else being equal. What effect does this have on the rate of reaction?
- A. The rate decreases
- B. The rate stays exactly the same
- C. The rate increases
- D. The reaction stops completely
5. A student adds a catalyst to a reaction and finds the same total volume of gas is produced, but in half the time. They also find the catalyst's mass is unchanged afterwards. Explain what this shows about catalysts.
- A. The catalyst was used up during the reaction
- B. The catalyst increased the rate of reaction without being chemically changed, and did not affect the total amount of product formed
- C. The catalyst decreased the rate of reaction
- D. The catalyst became part of the product