Which of the following indicates that an exothermic reaction has taken place?

A. a change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. absorption of heat by the reaction

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars