A student added equal masses of powdered, small, and large chips of calcium carbonate to hydrochloric acid in three different repeats of an experiment. gas was collected and measured after 30 seconds.
What was the independent variable?
What was the dependent variable?
Which of the following is not a control variable?
What is the variable that is measured in an experiment after the independent variable is altered?
A primary-school science experiment shows that people with big hands generally have big feet. What kind of relationship between the two variables is this an example of?