The starting materials in a chemical reaction are called

The answer is: The starting materials in a chemical reaction are called reactants... or can be called reagents too.

The principal component in a chemical reaction are the reactants, after the reaction, we have the products and we could have reactants too (if they are not completed consumed).

For example, given the following reaction:

Reactants are: 2C2H6 and 7O2

Products are: 4CO2 and 6H2O

Have a nice day!

they are all solids.

(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