Ammonia solution (NH4OH) is a pungent smelling liquid often used in household cleaning products. In order to make this product, two reactants, NH3 and water, have
to be combined. Which chemical reaction is correctly balanced using the
coefficients? PS 1-7-la
A. 4NH3 + H2O à 4NH4 +OH B.3NH3 + H2O à 4NH4 + OH C. 2NH3 + H2O à 2NH4 +OH D. NH3 + H2O à NH4OH

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(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

4d^55s^1 ( third choice)