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Per8_exercise - Period 8 Exercise Answers E.1 When in our...

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Period 8 Exercise Answers E.1 When in our classroom demonstration ammonium nitrate was dissolved in water, the temperature of the water decreased. This shows that a) an exothermic reaction occurred. b) an endothermic reaction occurred. c) the reaction used a catalyst. d) the ammonium nitrate was colder than the water. e) None of the above is correct. E.1 = b E.2 An exothermic reaction, such as that between carbon and oxygen, will not always begin when the chemicals are mixed. The molecules can be made to react by a) pumping the air out of the container. b) performing the reaction in the dark. c) lowering the specific heat of the oxygen. d) lowering the specific heat of the carbon. e) increasing the temperature. E.2 = e
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E.3 A certain chemical reaction involves both the making and breaking of chemical bonds. The energy involved in breaking existing chemical bonds is 15 joules. Ten joules of energy are released when new chemical bonds are made. This reaction is a) exothermic and releases 5 J of energy.
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