The reaction between calcium carbonate (CaCO3) and HCl produces calcium chloride (CaCl), carbon dioxide (CO2), and water (H20) What
happens when the concentration of hydrogen chloride (HCl) molecules is doubled in this reaction?
CaCo3 + 2HCl - CaCl2 + CO2 + H20
, which causes
When the hydrogen chloride concentration doubles, the number of collisions between the reactants
the rate of the forward reaction to

(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