Question

31 when a cold-park is activated, a chemical reaction occurs and the temperature of the park contents drops sharply. Which of the following is correct description of the reaction occuring in the park?
A the reaction is exothermic H to the power zero 0
B The reaction is exothermic, H ^0 <0
C the reaction is endothermic H^0>0
D the reaction is endothermicH^0<0
None of the above

Answer 1

C the reaction is endothermic H^o > 0

Explanation:

When a chemical cold pack is activated, a chemical reaction occurs and cold pack becomes cool to the touch. An endothermic reaction is occurring, absorbing heat from its surroundings.

H^o = H^o for products - H^o for reactants

If the standard enthalpy of the products is less than the standard enthalpy of the reactants, the standard enthalpy of reaction will be negative and the reaction is exothermic.

If the standard enthalpy of the products is more than the standard enthalpy of the reactants, the standard enthalpy of reaction will be positive and the reaction is endothermic.

So, for endothermic reaction H^o > 0