Since all solutions had the same original concentration (1.0 M), what accounts for the difference in the slope of the three points

An experimental procedure requires a 10 ml of acid to be dissolved

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.

Avariable that is not being directly tested during an experiment should be