Question

which of the following is the test variable (independent variable)? type of mixture used different beakers used amount of carbon dioxide released variables cannot be identified based on the graph amount of ca type of mixture used beaker a beaker b trial 1 trial 2 beaker c beaker d

Explanation:

In an experiment, the independent variable is what is changed or manipulated. Here, the type of mixture used is being changed across different trials in different beakers, while the amount of carbon - dioxide released would be a possible dependent variable. The beakers themselves are just containers and not a test variable. Variables can be identified from the graph based on what is being altered.

Answer:

type of mixture used