I. Write the half-reactions for this reaction, indicating the oxidation half-reaction and the reduction half-reaction. (1 point) Oxidation half-reaction: Cr3+→+6Cr2O2−7+3e−
ii. Which metal is the anode, and which is the cathode? (1 point)
iii. Calculate the standard potential (voltage) of the cell. (1 point)
iv. What kind of electrochemical cell is this? Explain your answer. (1 point)
v. Write the standard cell notation for this electrochemical cell. (1 point)
vi. Which of the two metals — Ag(s) or Ni(s) — is a stronger reducing agent? Explain your answer. (1 point)

(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