Question

A chemist is conducting an experiment to find an enzyme that speeds up a reaction between Chemical A and Chemical B. The chemist places Chemical A and Chemical B together in a beaker and then times how long it takes for the reaction to occur. Next, the chemist places the same amount of the two chemicals in a second identical beaker. The chemist adds an enzyme and then times how long the reaction takes to occur.

Did the chemist use adequate experimental controls?
A.
Yes, both of the reactions that occurred acted as controls.
B.
No, this experiment included two variables instead of one.
C.
Yes, the first chemical reaction (without the enzyme) acted as a control.
D.
No, this experiment did not include a control group.

Answer 1

C. Yes, the first chemical reaction (without the enzyme) acted as a control.