Food contains chemical potential energy that the body uses. How do you think that the body gains this energy? Propose an explanation.

The body gain the energy through the digestion of the food we eat and when it is breakdown it releases energy.

Explanation:

The food we consumed is digested by the activities of acids and enzymes in the stomach.

Carbohydrates are the primary source of body energy.

When it is eaten, it digestion starts from the mouth when it mixed with the saliva released from the salivary gland and salivary amylase acts on it.

When it's get to the stomach/ intestine, it is further breakdown through the activities of enzymes into glucose.

The stomach and the intestine absorb the glucose and release it into the blood stream. Glucose can be use as energy source or stored later and insulin help to release it.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"