Which reaction will NOT occur in nature? C5H12 (l) + 8O2 (g) → 5CO2 (g) + 6H2O (g)
2FeCl3 (aq) + 3Sr (s) → 3SrCl2 (aq) + 2Fe (s)
Cu (s) + CaSO4 (aq) → CuSO4 (aq) + Ca (s)
Mg(NO3)2 (aq) + Na2C2O4 → MgC2O4 (s) + 2NaNO3 (aq)

h let me think

it is a solid

explanation:

(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