a scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron…

a scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. which action would be most important to perform in a controlled experiment? design an experiment that is based on previously published results. expose the treated iron to the corrosive effects of the air. test a large piece of treated iron and a small piece of untreated iron. test a piece of treated iron and a piece of untreated iron under the same conditions.

a scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. which action would be most important to perform in a controlled experiment? design an experiment that is based on previously published results. expose the treated iron to the corrosive effects of the air. test a large piece of treated iron and a small piece of untreated iron. test a piece of treated iron and a piece of untreated iron under the same conditions.

Answer

Brief Explanations:

In a controlled experiment, only one variable (here, the treatment of iron) should be different while other conditions are kept the same. Testing a treated and an untreated iron under the same conditions allows for a fair comparison to determine the effect of rust on chemically - treated iron.

Answer:

Test a piece of treated iron and a piece of untreated iron under the same conditions.