2 Pretest: Unit 1 Question 10 of 32
John wants to test how temperature affects the mass of sugar that can be
dissolved in water. Which of the following factors must be the same between
the control group and the experimental group?
A. The temperature of the water
B. The mass of the sugar
C. The volume of the water
D. The time of day
CUID

In John's experiment to evaluate the effect of temperature on the sugar mass that will be  dissolved in water, the common factor between  the control group and the experimental group is the sugar mass (option B)

Explanation:

In an experiment, the study subjects are usually divided into an experimental and a control group. The first group will be exposed to a variable to observe the effect, while the control group will not be exposed to variables of any kind.

For the results of the experiment to be reliable, the characteristics of the subjects in both groups must be similar, so the sugar mass must be the same in both the experimental and control groups.

An example of groups with different characteristics would be to perform the same experiment with an experimental group of refined sugar and a control group with brown sugar.

The other options are not valid because:

pregnancy happens more and more

one centimetre is equal to 0.01 metres