Question

A cold pack is snapped, and the chemical reaction causes the pack to feel cold. Which kind of reaction is this?

A.) This is an endothermic reaction because the surroundings took energy from the system.
B.) This is an exothermic reaction because the system took energy from the surroundings.
C.) This is an endothermic reaction because the system took energy from the surroundings.
D.) This is an exothermic reaction because the surroundings took energy from the system.

Help!!!

Answer 1

here are the answers

the change in energy in a system during an exothermic reaction

In the air, only the oxygen is part of the system.

The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings

This is an endothermic reaction because the system took energy from the surroundings.

Energy is released by the formation of chemical bonds, and energy is absorbed when the bonds are broken.