What does a substance do when it diffuses?

Can someone me with questions 15 to 17 plz.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Chemistry worksheet - i am not sure what they are asking for exactly?