Bond Making & Breaking Quiz
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5 questions, one answer each
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1. What happens to energy when a chemical bond breaks?
- A. Energy is released
- B. Energy is absorbed
- C. No energy change occurs
- D. Energy is destroyed
2. What happens to energy when a new bond forms?
- A. Energy is released
- B. Energy is absorbed
- C. No change
- D. Energy disappears
3. In an exothermic reaction, which statement is true?
- A. Bond breaking releases more energy than bond forming absorbs
- B. Bond forming releases more energy than bond breaking absorbs
- C. No bonds are broken
- D. No bonds are formed
4. Which calculation gives the overall energy change of a reaction?
- A. Energy released forming bonds minus energy to break bonds
- B. Energy to break bonds in reactants minus energy released forming bonds in products
- C. Energy to break bonds in products minus energy released forming bonds in reactants
- D. Number of bonds broken times number of bonds formed
5. Breaking the bonds in the reactants of a reaction requires 500 kJ, and forming the bonds in the products releases 620 kJ. What can be concluded?
- A. The reaction is endothermic, energy change = +120 kJ
- B. The reaction is exothermic, energy change = -120 kJ
- C. The reaction is exothermic, energy change = +1120 kJ
- D. No reaction occurs