Honors Chemistry 2017-2018 WS 3.6 Energy Conversions 1) Perform each of the following conversions: a. 654 cal to joules b. 12.9 J to Calories c. 167 kJ to Calories d. 99.3 Cal to joules e. 5.7 X 103 J to kilojoules f. 326 kJ to joules 2) In a chemical cold pack, two substances are kept separate by a divider. When the divider is broke, the substances mix and absorb heat from the surroundings. The chemical cold pack feels cold. Is the reaction endothermic or exothermic? Draw an energy diagram showing the relative energies of the reactants and products in the reaction. 3) Determine whether each of the following is exothermic or endothermic. a. Dry ice subliming (changing from a directly to a gas) b. The wax in a candle melting c. A match burning 111
Honors Chemistry 2017-2018 WS 3.6 Energy Conversions 1) Perform each of the following conversions: a. 654 cal to joules b. 12.9 J to Calories c. 167 kJ to Calories d. 99.3 Cal to joules e. 5.7 X 103 J to kilojoules f. 326 kJ to joules 2) In a chemical cold pack, two substances are kept separate by a divider. When the divider is broke, the substances mix and absorb heat from the surroundings. The chemical cold pack feels cold. Is the reaction endothermic or exothermic? Draw an energy diagram showing the relative energies of the reactants and products in the reaction. 3) Determine whether each of the following is exothermic or endothermic. a. Dry ice subliming (changing from a directly to a gas) b. The wax in a candle melting c. A match burning 111
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