If an acid has a pH of 2, what is its [H^ + ] ?

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The concepts of pH and acid strength are only loosely related to each other. You can get to a pH of 2 with either a fairly concentrated solution of a weak acid or a very dilute solution of a strong acid.

0.01 M strong acid (HCl, HNO 3 , HClO 4 , etc.) has a pH of 2.0

HNO 2 , nitrous acid, a fairly strongish weak acid, has a pKa of 3.39 (Ka = 4 x 10 −4 ). A 1 M solution of nitrous acid will have a pH of 1.7.

So you see, just knowing the pH (unless it’s significantly less than 1) doesn’t tell you whether the acid is strong or weak.

Check G the answer is up theree

(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