Question

1. a student is investigating how stirring affects the rate of dissolving. what is the independent variable in this investigation? stirring temperature concentration particle size

Explanation:

The independent variable is the factor that is deliberately changed or manipulated in an experiment. Here, the student is investigating how stirring affects the rate of dissolving, so stirring is what is being changed. Temperature, concentration, and particle - size are not the focus of this investigation.

Answer:

A. Stirring