Question

Circle the correct choices in the following sentence to summarize the heat change that occurs when the commercial cold pack is activated: “When the white solid in the commercial cold pack dissolves in water, the pack feels (hold/cold) because the temperature of the solution (increases/decreases). Energy is (absorbed/released) from the surroundings during this reaction and the reaction is classified as (endothermic/exothermic). The sign of ΔH for the heat solution is (positive/negative).”

Answer 1

Cold pack contains ammonium nitrate, calcium ammonium nitrate or urea,when this is dissolved in water,its temperature decreases and hence the reaction is endothermic.

when the commercial cold pack is activated: “When the white solid in the commercial cold pack dissolves in water, the pack feels (cold) because the temperature of the solution (decreases). Energy is (absorbed) from the surroundings during this reaction and the reaction is classified as (endothermic). The sign of ΔH for the heat solution is (positive).”