Is the starting substance in a chemical reaction

Reactants is the starting substance in a chemical reaction

Explanation:

Reactants are chemical substance that is consumed in a chemical reaction to produce a new substance known as product. The reactant is the starting substance of all chemical reaction. Without the reactant the product cannot be formed.

The reactants are usually located on the left hand side of a chemical equation while the product is located at the right hand side of a chemical equation.

A chemical equation between the reaction of an acid like HCl and a base like NaOH can be written as follow

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

The Hydrochloric acid and the sodium hydroxide is the reactants of the equation above. The salt, Sodium chloride and water is the product of the chemical reaction.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied