Draw, label and color code representative particles for each reactant(s) and each product(s) in a clear table for the reaction mg (s) + hcl (aq) --> mgcl2 (aq) + h2 (g) such as:

reactant(s) product(s)

include a color code key:

atom mg is denoted by the color:
atom h is denoted by the color:
atom cl is denoted by the color:

i believe the answer is a.

(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

the correct answer would be b) volume versus temperature, because they are also directly proportional.