1. 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.