1.
The chemical reaction is written as follows:

2.
The chemical reaction is written as follows:

Thus, the balanced chemical equation with their state is written as above.
A, B, and C are hilarious. D is correct.
Charges can be positive or negative, so a pair of charges can be alike or opposite. But so far, we've never seen a negative mass.
The answer is B 1,500 meters since 1 kilometer to meters is 1,000 and u add the 500