Answer:A(n) molecule that is made up of atoms that are chemically bonded is the smallest recognizable unit of a compound.
Explanation:
Answer Option c. between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is great.
The answer should be (D) endothermic reaction.
Reason : - Reactions in which energy is absorbed are called endothermic reactions. In your provided question, 150 kcal energy is being <u>absorbed</u>, and thus, we can say that it is an endothermic reaction.
So you need to put numbers before each compound to make sure there are the exact same number of elements on each side. If you put a 4 before NH4 there are 4 Nitrogen and now 16 hydrogen. I just played around with numbers and guessed until I got them even.
B. condenses is the answer