CH4 (g) + 2Cl2 (g) --> CH2Cl2 (g) + 2HCl (g) <span>ΔH = -205.4</span>
Answer:
Promethazine is in a class of medications called phenothiazines. It works by blocking the action of a certain natural substance in the body.
A control group is an essential part of an
experiment because it allows you to eliminate and isolate these variables.