Answer !
explain the law of conservation of energy. then give an example that shows this law to be true. in your example, explain where there is potential and where there is genetic energy. also, explain if any energy is "lost friction".

The law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time .

For example, suppose there is a rock at the top of a hill. It has a lot of potential energy because it is placed at a high point. Next, the rock fall downhill, then it speed increases along the fall (at first it speed was zero), increasing at the same time its kinetic energy while potential energy decrease given that the height of its position decrease. Also some potential and kinetic energy is lost because of friction between the rock and the soil.

As you can see, when some kind of energy is lost another kind of energy/energies increase proportionally, and then the total energy is conserved.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.