What are 2 types of chemical reactions that exist in terms of energy input/output?

Question

Please help! And if you can explain it to me that would be great!

Answer 1

Endothermic reactions are ones that take energy from their surroundings. They are not usually spontaneous.
Exothermic reactions release energy into their surroundings and usually are spontaneous.

Answer 2

Endothermic Reactions and Exothermic Reactions

Endothermic Reactions
Chemical reactions in which energy is absorbed are endothermic. Energy is required for the reaction to occur. The energy absorbed is often heat energy or electrical energy. Adding electrical energy to metal oxides can separate them into the pure metal and oxygen. Adding electrical energy to sodium chloride can cause the table salt to break into its original sodium and chlorine parts.

Exothermic Reactions
Chemical reactions in which energy is released are exothermic. The energy that is released was originally stored in the chemical bonds of the reactants. Often the heat given off causes the product(s) to feel hot. Any reaction that involves combustion (burning) is an exothermic chemical reaction.

Answer 3

Exothermic and Endothermic are what I believe you're looking for.
An exothermic reaction is one that , once begun, will go to completion without the addition of additional energy,e.g. combustion.

An endothermic reaction is one that requires the constant application of more energy to continue,e.g.photosynthesis.

These are the two basic types of chemical reactions, and it should be noted that ANY exothermic reaction can be a source of useful energy to do work.

Answer 4

The energy could either be a bonding energy that gets imparted on other molecules or atoms or simply be released to the surrounding environment as heat. Additionally, chemical reactions may not release energy at all and instead require constant energy input to continue.