Describe an example of an endothermic and exothermic reaction. For each of your reactions, identify whether it is a physical or chemical change and explain how the reaction supports the law of conservation of mass.

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the product

Physical reaction:

The physical reaction definition is a reaction in which molecules undergo molecular rearrangement but are not chemically altered. Physical reactions may include changes in texture, shape, temperature, and state, without a change in the composition.

Therefore,

both example of endothermic and exothermic example mentioned are chemical reaction as in both bonds are broken and formed

Now,

The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed and every balanced equation obeys the Law of Conservation of Mass.

In first endothermic :

[tex]CaCO_{3}[/tex] + heat → CaO + [tex]CO_{2}[/tex]

As the reaction is balanced , if we examine both the sides elements are in equal proportion

i.e mass is neither created nor destroyed

In second exothermic :

C(g) + [tex]O_{2}[/tex](g) → [tex]CO_{2}[/tex] (g) + Heat Energy

If 6 gm carbon combines with 16 gm of oxygen to form 22 gm of carbon dioxide.

I.e mass is neither created nor destroyed

Hence, The law of conservation of mass is obeyed by both endothermic and exothermic equations ,

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