Im stuck and my teacher hates my guts

imagine two billiard balls on a pool table. ball a has a mass of 2 kilograms and ball b has a mass of 3 kilograms. the initial velocity of ball a is 9 meters per second to the right, and the initial velocity of the ball b is 6 meters per second to the left. the final velocity of ball a is 9 meters per second to the left, while the final velocity of ball b is 6 meters per second to the right.
1. explain what happens to each ball after the collision. why do you think this occurs? which of newton’s laws does this represent?

2. what can you say about the total momentum before and after the collision?

3. what do you think would happen to the velocity of each ball after the collision if the masses and initial velocities of each ball were the same?

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.

What is the empirical formula for c4h8o2