Question

4 multiple choice 1 point in a coffee - cup calorimeter, two substances are mixed and the temperature of the solution decreases. which statement is true? d) heat was released by the solution. b) the reaction is endothermic. a) the reaction is exothermic. c) the specific heat of the mixture is zero. 5 multiple choice 1 point the phase change from liquid water to ice is called freezing. what type of process is freezing? d) exothermic, because the temperature increases. b) exothermic, because energy is released by the water. c) endothermic, because the temperature decreases. a) endothermic, because energy is absorbed by the water.

Explanation:

For question 4, when the temperature of the solution in a coffee - cup calorimeter decreases, it means the reaction absorbs heat from the solution, so it is an endothermic reaction. For question 5, during the freezing of water (liquid to solid), water releases energy to the surroundings, which is an exothermic process.

Answer:

1. b) The reaction is endothermic.
2. b) Exothermic, because energy is released by the water.