Energy level diagrams and bond energy Quiz
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5 questions, one answer each
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1. Which part of a reaction profile shows the activation energy?
- A. The gap between reactants and products
- B. The height from the reactants to the top of the peak
- C. The height of the products
- D. The distance along the horizontal axis
2. In a reaction, 500 kJ is taken in breaking bonds and 650 kJ is released making bonds. What is the overall energy change?
- A. +150 kJ
- B. −1150 kJ
- C. +1150 kJ
- D. −150 kJ
3. Which statement about breaking bonds is correct?
- A. It releases energy
- B. It has no energy change
- C. It takes in energy
- D. It only happens in endothermic reactions
4. The products of a reaction are higher on the profile than the reactants. What type of reaction is it?
- A. Endothermic
- B. Exothermic
- C. Neutralisation
- D. Combustion
5. Why does an exothermic reaction such as burning methane still need a spark?
- A. Because the reaction takes in energy overall
- B. Because making bonds takes in energy
- C. To lower the energy of the products
- D. To supply the activation energy