In a chemical equation, chemicals that react are the reactants, while chemicals that are produced are the products/by products. Both sides of the equation must be balanced.
Explanation
When writing a chemical equation, reactants reacts to produce products. For example in the equation for formation of water, hydrogen combines with oxygen as 2H₂ +O₂→2H₂O where the first part before the arrow represent the reactants and the next part after the arrow are the products. Reactants are on the left where as products are on the right.Coefficient 2, in this cases is used for balancing the equation.
<u>A chemical equation</u><u> that shows the chemical formulas of substances that are reacting and the substances that are produced.</u>
<h2>Explanation:</h2>
A chemical equation should also be balanced on both sides. A chemical equation shows the substances involved in a chemical reaction . The substances that react are called reactants and the substances that are produced are called products. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.
For example
2 HCl + 2 Na → 2 NaCl + H
2
This equation will be counted as two HCl plus two Na yields two NaCl and H two.
Photon is also a particle . Hence when two particles like electron and positron annihilate to get completely changed to photons , a minimum of two photons of equal and opposite momentum and energy are produced flying in opposite direction to conserve momentum and energy . Each photon will have same energy equal to 511 keV . It is so to conserve momentum and energy. Initially total momentum was zero so finally too total momentum should be zero.
