About Chemical reactions

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 products. An arrow is drawn between the reactants and products to indicate the direction of the chemical reaction, though a chemical reaction is not always a "one-way street."

For example, the reaction for breakdown of hydrogen peroxide ($H2$start text, H, end text, start subscript, 2, end subscript$O2$start text, O, end text, start subscript, 2, end subscript) into water and oxygen can be written as:

$2H2$2, start text, H, end text, start subscript, 2, end subscript$O2(hydrogen\; peroxide)$start text, O, end text, start subscript, 2, end subscript, start text, left parenthesis, h, y, d, r, o, g, e, n, space, p, e, r, o, x, i, d, e, right parenthesis, end text $\to$right arrow $2H2O(water)$2, start text, H, end text, start subscript, 2, end subscript, start text, O, end text, start text, left parenthesis, w, a, t, e, r, right parenthesis, end text + $O2(oxygen)$

Explanation:
In this example hydrogen peroxide is our reactant, and it gets broken down into water and oxygen, our products. The atoms that started out in hydrogen peroxide molecules are rearranged to form water molecules (H2OH2Ostart text, H, end text, start subscript, 2, end subscript, start text, O, end text) and oxygen molecules (O2O2start text, O, end text, start subscript, 2, end subscript).

You may have noticed extra numbers in the chemical equation above: the $2$2s in front of hydrogen peroxide and water. These numbers are called coefficients, and they tell us how many of each molecule participate in the reaction. They must be included in order to make our equation balanced, meaning that the number of atoms of each element is the same on the two sides of the equation.

Further detail we will discuss in blog.

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