Got this question incorrect and no matter how hard i try i can't figure it out!

The right answer is the third option:

10^-3 L / 1 mL

That conversion factor may be derived from 1 L = 1000 mL

=> 1 L / 1000 mL = 1

=> 10 ^ - 3 L / 1 mL = 1

So, you can mutilply by the conversion factor 1 * 10^ -3L / 1 mL because it the equivalent to 1.

The other options are not valid. Let's see why:

1 KL = 1000 L => 1KL / 1000 L = 1

=> 10 ^ - 3 KL / 1 L, which is contrary to the first option.

In that same way you can find the righ conversion factors that relate L with cL, and L with d and you will discard the other options.

Neither model is able to show the reactivity of potassium.

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.