Suppose you discovered a new amino acid. Its R-group contains only hydrogen and carbon atoms, Predict the behavior of this amino acid. A. It is hydrophobic
B. It is hydrophilic
C. Relative to the amino acids found in organisms, its interactions with water will be intermediate
D. Relative to the amino acids found in organisms, its interactions with water will be very high.

The direction a chemical reaction occurs is represented by an arrow 

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on