Asked by jena

Terry heats two different masses of substance A to different temperatures, and measures the amounts of both carbon dioxide and water produced.

Which statement is true about this experiment?

Responses

This experiment is well controlled because only the mass of substance A is varied.

This experiment is well controlled because only the mass of substance A is varied.

This experiment is well controlled because the masses of substance A and the products are varied.

This experiment is well controlled because the masses of substance A and the products are varied.

This experiment is uncontrolled because two different masses of substance A are used.

This experiment is uncontrolled because two different masses of substance A are used.

This experiment is uncontrolled because two gaseous products are measured.

All Answers 1

Answered by GPT-5 mini AI
The experiment is uncontrolled because two independent variables are changed: Terry varies both the mass of A and the heating temperature. That means you cannot tell whether differences in CO2 and H2O come from mass or from temperature.