TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Collision theory states that chemical reactions occur when atoms, ions, or molecules collide.

SOLUTION: What states that chemical reactions occur when atoms, ions, or molecules collide?

PROBLEM: Elements are pure substances that make up all matter.

SOLUTION: Elements are pure substances that make up what?

PROBLEM: The term amines is used to describe molecules that contain carbon-nitrogen bonds.

SOLUTION:
What term is used to describe molecules that contain carbon-nitrogen bonds?