- Ibrahim and Emmanuel have been investigating the amount of copper sulfate that
can be dissolved in water at different temperatures. They added copper sulfate until
no more would dissolve and they carefully measured the mass of the copper sulfate
they added. Here are their results.

+ Temperature of water / °C
20
30
40
50
60
70
80

+Mass of copper sulfate dissolved / g
22
24
28
32
30
46
58

a. What is the range of temperatures that the boys used?
b. What interval did they use for the temperatures?
c. Name a variable the boys should have kept the same.
d. Which is the independent variable?
e. What conclusion can the boys make from their results?

An experiment is a scientific investigation that seeks to obtain cause and effect relationships. There must be a dependent and an independent variable in every experiment.

The average of the temperature readings is; 20 + 30 + 40 + 50 + 60 + 70 + 80/7 = 50

They used an interval of 10 degrees for the temperature readings. The boys should have kept the heating time the same. The independent variable in this experiment is the temperature. The boys can arrive at the conclusion that as temperature increases, a greater mass of copper sulfate is dissolved in water.

Learn more about dependent and independent variables: https://brainly.com/question/967776