Solve step by step, and then state which choice should be (DO NOT answer if you
ID: 1029003 • Letter: S
Question
Solve step by step, and then state which choice should be (DO NOT answer if you are not confident that your answer is 100% correct), also kindly do not copy other chegg answers.
27. 2 aqueous solutions are both at room temperature and are then mixed in a coffee cup calorimeter. The reaction causes the temperature of the resulting solution to fall below room temperature. Which of the following statements is TRUE? a. The products and reactants have a same potential energy b. Energy is leaving the system during reaction. c. The reaction is exothermic. d. This type of experiment will provide data to calculate Erxn e. The products have higher potential energy than the reactants.Explanation / Answer
The reaction decreased the temperature below the room temperature
Change in Temperature = Tf - Ti < 0, which means the reaction is absorbing heat, hence the reaction must be endothermic reaction [Since the temperature has decreased, so it is absorbing the coffee calorimeter heat to main the temperature]
a) The products and reactants have same potential energy - False, since if that is the case, then the change in temperature will be zero
b) The energy is leaving the system during reaction - False, if that would have the case, then change in temperature would have been positive and it would have been an exothermic reaction
c) The reaction is exothermic - False, since the reaction is endothermic
d) This type of experiment will provide data to calculate Erxn - False, it requires cup calorimeter constant and other data as well, so it can't be the case
e) The products have higher potential energy than the reaction - TRUE, since the heat of reaction = products - reactants, will be positive which implies an endothermic reaction
HENCE THE CORRECT ANSWER IS ONLY OPTION E
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