Chapter 15, Problem 33R

To determine

The independent variable, control, and constant in the experiment.

Explanation of Solution

Introduction:

A variable is a value of an entity which is changing as the time being passed.

A constant is a value an entity which is not changing with time.

In the given experiment, the temperature of different substances is changed, so temperature is a. variable.

Person M poured equal amount of suspension in each test tube. So,the volume of the suspension is constant. The control is time.

Conclusion:

Thus,the independent variable is temperature, constant is volume of the suspension, and control is time.