Standard potentials are measured against the standard hydrogen electrode (S. H.E.). Because it is not always convenient to use a S. H.E., often other reference electrodes are used. The saturated calomel electrode (S. C.E.) is one commonly used reference electrode, with a reduction potential of 0.242 V versus the S. H.E. Using a table of standard reductions, determine what the potential of each reduction below would be versus the S. C.E? Cu2+(aq) + 2e^- ⇌ Cu(s)
Al3+(aq) + 3e^- ⇌ Al(s)

(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

a physical change biology

explanation: