1) An endothermic reaction is a reaction where heat is "absorbed" and the surrounding area is cooled. An example of an endothermic reaction is the classic baking soda and vinegar reaction. The mixture gets cold.
An exothermic reaction is one which gives off heat, such as burning, which is itself a chemical reaction.
2) (I don't actually know this one but i hope i helped with number one)
Answer:
2N2H2SO4
Explanation:
this is your answer calculate
The low vapor pressure of water preventing bodies of water from dying out.
1.2*104 is 12000 it is easy just try ur best
