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1. In a compound, chemical energy is contained in the (1 point) a.nuclei of the atoms. b.unbonded electrons. c.bonds. d.movement of the electrons. 2. Which of the following statements is true about what happens during a chemical reaction? (1 point) a. Bonds of the reactants are broken, and bonds of the products are formed. b. Bonds of the reactants are formed, and bonds of the products are broken. c. The bonds of both the reactants and the products are broken. d. The bonds of both the reactants and the products are formed. 3. In terms of energy, how would you classify the following chemical reaction? 2Cu + O2 2CuO + 315 kJ (1 point) a.endothermic b.exothermic c.both endothermic and exothermic d.neither endothermic nor exothermic

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