Question

Chemists measure energy in units of _________ because it is based on heating water. Since most chemical reactions are doing in water or surrounded by water, this is an easy way to measure the energy change during a reaction.
A work
B Joule
C Calorie
D Horsepower

Answer 1

The answer is; C

A calorie is  a unit of energy used to describe the energy required to raise the temperature of one gram of water by one degree at an ambient pressure of 1 atmosphere. This SI unit has gained popularity in its use in nutrition where the energy in a particular type of food (carbohydrates, proteins, and fats) is measured in calories.