Question

A)
Is the process of water evaporating endothermic or exothermic?
(1 point)
It is exothermic because heat from the surroundings has to be absorbed by the water in order to change states.
It is exothermic because as the liquid water changes into water vapor, it releases heat into the air.
It is endothermic because as the liquid water changes into water vapor, it releases heat into the air.
It is endothermic because heat from the surroundings has to be absorbed by the water in order to changestates.
Question
13
Question
14
A)
A burner in a gas stove breaks propane and oxygen up to form carbon dioxide and water, thereby heating a home. Which part is the source of the activation energy required, and is this reaction endothermic or exothermic.
(1 point)
The fl ame from the burner provides the energy to perform the reaction. The reaction is exothermic.
The burning propane gas provides the energy to perform the reaction. The reaction is exothermic.
The fl ame from the burner provides the energy to perform the reaction. The reaction is endothermic.
The burning propane gas provides the energy to perform the reaction. The reaction is endothermic.

Answer 1

1) It is endothermic because heat from the surroundings has to be absorbed by the water in order to change states.

2) The flame from the burner provides the activation energy. The reaction is exothermic (combustion releases heat).