Yes, Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.
Not sure about the variable one though, sorry!
Answer:
A contact force must touch an object to influence it. For example you need to push you desk to move it.
A non-contact doesn't need to touch an object to influence it. For example a magnet pulls an object without touching it.
Answer:
Todos los seres vivos respiran, comen, crecen, se mueven, se reproducen y tienen sentidos. Los seres no vivos no comen, crecen, respiran, se mueven y se reproducen. No tienen sentidos.
Explanation: