Bond Energies Quiz
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5 questions, one answer each
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1. What happens to the temperature of the surroundings in an exothermic reaction?
- A. It decreases
- B. It increases
- C. It stays the same
- D. It cannot be predicted
2. Which of these is an example of an endothermic reaction?
- A. Combustion of methane
- B. Neutralisation of an acid and alkali
- C. Thermal decomposition of a metal carbonate
- D. Rusting of iron
3. What does the activation energy represent on a reaction profile?
- A. The overall energy change of the reaction
- B. The energy released by the products
- C. The minimum energy particles need to collide and react
- D. The energy stored in the reactants only
4. (HT) In a reaction, breaking bonds in the reactants requires 400 kJ and forming bonds in the products releases 550 kJ. What is true of this reaction?
- A. It is endothermic, releasing 150 kJ overall
- B. It is exothermic, releasing 150 kJ overall
- C. It is exothermic, releasing 950 kJ overall
- D. It is endothermic, requiring 150 kJ overall
5. (HT) A reaction requires 620 kJ to break reactant bonds and releases 500 kJ forming product bonds. What type of reaction is this?
- A. Exothermic, net release of 120 kJ
- B. Endothermic, net absorption of 120 kJ
- C. Exothermic, net release of 1120 kJ
- D. Neutral, no energy change