Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Which of the following is true if an exothermic re...

Solution: Which of the following is true if an exothermic reaction occurs out in a coffee-cup calorimeter?A. ΔH of the reactants is lower than ΔH of the products B. ΔH of the products is lower than ΔH of the reactants C. ΔH of the reactants is higher than ΔH of the products D. ΔH of the products is higher than ΔH of the reactants E. Two of the above

Problem

Which of the following is true if an exothermic reaction occurs out in a coffee-cup calorimeter?

A. ΔH of the reactants is lower than ΔH of the products 

B. ΔH of the products is lower than ΔH of the reactants 

C. ΔH of the reactants is higher than ΔH of the products 

D. ΔH of the products is higher than ΔH of the reactants 

E. Two of the above

Solution

We are asked which of the following is true if an exothermic reaction occurs out in a coffee-cup calorimeter


Recall that:

Exothermic reactions

lose energy, releases heat, temperature of the surroundings increases
▪ involves bond formation (for phase change: gas → liquid → solid)
ΔH is negative


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