Question

Mrs. Johnson’s first period class is designing an investigation to determine what could affect the rate of chemical change when vinegar is added to baking soda. Which of the following would be a valid test (independent) variable for this experiment?

A. The Temperature of the vinegar at the start of the reaction.
B. The time it takes for the reaction to take place.
C. The amount of gas produced by the reaction
D. The color of the products of the reaction.

Answer 1

The valid independent variable for the experiment is the temperature of the vinegar at the start of the reaction, as this is a controllable factor that influences reaction rates.

Step-by-step explanation:

In Mrs. Johnson’s first period class experiment to determine factors that affect the rate of chemical change when vinegar is added to baking soda, the valid independent variable would be A. The Temperature of the vinegar at the start of the reaction. This is because, in chemical reactions, temperature is a known factor that can influence reaction rates, typically making reactions faster at higher temperatures and slower at lower ones. Options B, C, and D are not independent variables but rather dependent variables or observations that result from changes in the experimental conditions.