If an reaction takes place in an insulated container, at the end of the reaction
ID: 495842 • Letter: I
Question
If an reaction takes place in an insulated container, at the end of the reaction the temperature of the contents of the container will a. be higher than before the reaction began b. be lower than before the reaction began c. be the same as before the reaction began d. depend on the molecular weights of the substances involved e. depend on the heat capacities of the substances involved 2. The reaction of hydrochloric acid with sodium hydroxide is an reaction. If this reaction occurs in a calorimeter at atmospheric pressure, will the temperature of the calorimeter contents at the end of the reaction be higher than, the same as, or lower than, their temperature at the beginning of the reaction? a. higher b. same c. lower d. cannot be determined The specific heat of gold is 0.129 J/g degree C; the specific heat of silver is 0.237 J/g degree C and the specific heat of copper is 0.385 J/g degree C. This means that when one gram samples of each are placed in a beaker of hot water. a. the acid will gain the greatest amount of heat b. at the end the gold will be at the highest temperature c. the copper will absorb heat more quickly than the silver or gold d. the temperatures of all three samples will be different at the end e. the- copper sample will gain the greatest quantity of heatExplanation / Answer
2. a calorimeter is the tool used to measure this heat. It is an insulated apparatus containing a liquid reservoir in which the reaction occurs. The reservoir’s heat capacity relates the temperature change, T, in the reservoir due to heat transferred into or out of it.
Since the reaction of hydrochloric acid and sodium hydroxide is exothermic. Heat of neutralisation will flow into the reservoir of calorimeter and its temperature will increase accordingly.
therefore we can say, the temperature of the calorimeter contents will be higher at the end of the reaction than the temperature at the beginning of the reaction.