Question

a scientist wants to determine how long it will take for different amounts of an enzyme to speed up a chemical reaction. he tests the different amounts of the enzyme: 10 ml, 15 ml, and 20 ml. what is the independent variable?
○ the type of the enzyme
○ the amount of the enzyme
○ the rate/how long it will take for the enzyme to speed up the reaction

Explanation:

The independent variable is what's manipulated in an experiment. Here, the scientist changes the amount of enzyme (10 mL, 15 mL, 20 mL) to observe its effect on reaction time. The type of enzyme isn't changed, and reaction time is the dependent variable (measured outcome). So the independent variable is the amount of the enzyme.

Answer:

B. the amount of the enzyme