Explain why energy is necessary to chemical reactions, and describe some common sources of energy.

Activation energy

Explanation:

All chemical reactions need energy to get started, this energy is known as the activation energy.some reactions are exothermic ( heat is given out to the surroundings) or endothermic (heat is being absorbed from the surrounding). All these involves a form of heat.

Sources of activation energy include : enzymes, combustion reactions

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

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