What is biochemistry? What is organic chemistry? What are the two most important properties of all matter? What is an atom? What is a compound?...

There are so many questions, I will answer few of them. You need to post them as separate questions.

1.) Biochemistry: is the science of chemical processes related to biological forms or living beings.

2) Organic Chemistry: is the scientific study of chemistry related to carbon compounds.

5) Compound: made up of two or more elements, in a certain fixed ratio. A compound may have properties that are different from that of its constituents. An example of a compound is water (H2O).

6) Matter: anything that occupies space and has mass. Examples include, living beings, elements, compounds, etc.

7) An example of physical change is melting of solid iron, which results in phase change, yet the material remains the same.

8) An example of chemical change is burning of wood, where gases and other products are released; thus, exhibiting a change in chemical composition of the reactant.

43) Two variables are inversely proportional if their product has a constant value.

Hope this helps.