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A student exposes iron filings, at room temperature, to water and oxygen. Over time, a new substance forms. The student conducts an experiment to determine if the same type of chemical change occurs with other metals. What are ,begin emphasis,three,end emphasis, controlled variables in the experiment?Answer options with 6 options A.type of metal.texture of metalS.exposure to water.presence of oxygen.presence of iron in metalS.temperature of surroundings

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In the experiment described, the following three variables should be controlled to ensure that the results are valid and can be compared:

  1. Type of Metal - Ensure that the student tests different metals but keeps the type of metal consistent for each specific trial.
  2. Exposure to Water - Control the amount and duration of exposure to water for each trial to ensure consistent results.
  3. Presence of Oxygen - Ensure that all metals are exposed to the same conditions of oxygen during the experiment, possibly using the same setup for each test.

By controlling these variables, the student can more accurately determine how different metals react under the same experimental conditions.