A reaction in which energy is listed as a reactant is called A. exothermic
B. endothermic
C. combustion
D. inflammable
Need ASAP. 50 points!!!

An exothermic chemical reaction is defined as reaction in which energy is released as a product into a surrounding. Increase in temperature of the surrounding is also observed.

The energy in the exothermic chemical reaction is due to formation of products which are more stable than the reactants. During the chemical reaction breaking and formation of bonds takes place which leads to formation of stable products.

These so formed products are stable at lower energy due to which excessive energy is released out as a heat into surrounding.

An endothermic chemical reaction is defined as reaction in which energy is absorbed from the surrounding. Decrease in temperature of the surrounding is also observed.

Explanation:

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.