Variables

Question 1

What is a variable in an experiment?

Answer 1

A factor that can be changed, measured, or kept the same.

Question 2

What is the independent variable?

Answer 2

The variable that is changed by the experimenter to test its effect.

Question 3

What is the dependent variable?

Answer 3

The variable that is measured — it changes in response to the independent variable.

Question 4

What is a control variable?

Answer 4

A variable that is kept the same to ensure a fair test.

Question 5

Why is it important to control variables in an experiment?

Answer 5

To make sure the results are only affected by the independent variable.

Question 6

Why must temperature be kept constant in osmosis/diffusion experiments?

Answer 6

Because temperature affects the rate of particle movement.

Question 7

Why should all samples be left in solution for the same time?

Answer 7

To ensure a fair comparison of results.

Question 8

What must be kept the same about the object being tested (e.g., potato strips)?

Answer 8

The size and shape of each piece.