a student does not observe a change when holding a test tube in a flame. however, a change is expected. what…

a student does not observe a change when holding a test tube in a flame. however, a change is expected. what is the most likely reason for this? the bunsen burner was not properly adjusted. the test tube holder was used to hold the copper wire. the products looked the same as the reactants. the reactants were not heated long enough.

a student does not observe a change when holding a test tube in a flame. however, a change is expected. what is the most likely reason for this? the bunsen burner was not properly adjusted. the test tube holder was used to hold the copper wire. the products looked the same as the reactants. the reactants were not heated long enough.

Answer

Answer:

The reactants were not heated long enough.

Brief Explanations:

If a reaction - expected change didn't occur, insufficient heating time is a likely cause. A poorly - adjusted Bunsen burner could be a factor but not as likely as insufficient heating time. Using a test - tube holder for copper wire is not relevant to the lack of reaction observation. Products looking like reactants is less likely than not heating long enough in a simple non - visual change reaction scenario.