Question

Terry heats two different masses of substance A to different temperatures, and measures the amounts of both carbon dioxide and water produced. Which of the following is true about this experiment?

Answer 1

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

Explanation:

From the given options and the details of the experiment, it is easy to infer that the experiment is uncontrolled.

A controlled experiment is a specially designed experiment that is used to understand a single variable or set of variables.

• The experiment above is not a controlled one.
• The reaction used different masses.
• The amount of heat supplied also varied
• They were heated to the different temperatures.
• There was nothing being controlled in the experiment.

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Answer 2

Answer:

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

Explanation:

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