We subtract the enthalpies of the reactants from that of the products:

Since this is < 0, this is an exothermic reaction.

The 2 in front of
in
is <u>Coefficient.</u>
_____________________________
The
after
in the same equation is <u>sub </u><u>script</u><u>.</u>
_____________________________
There are two atoms of
in 
_____________________________

The answer is 4. It can hold 4 sublevels as s.p,d,f and it holds 32 electrons
Answer:
The molecules in the water become more separated due to heat.
Answer:
Positive: Save fuel and reduces greenhouse gas
Negative: Harmful to human and animal health ( underwater animals), Hurts the food chain
Explanation:
I got it from a video. Hopefully it helps you.