SAT II Chemistry Exam Prep

Category - General Chemistry

A chemistry class is planning to use a fume exhaust hood to study the reaction between the elements copper and sulfur. Before beginning the experiment, the teacher will review with the class the proper use of the exhaust hood. Which of the following instructions should be included in this discussion?
  1. Avoid using Bunsen burners within the fume exhaust hood.
  2. Turn off the fan while performing the experiment.
  3. Keep the sash in its lowered position during the experiment.
  4. Step away from the fume exhaust hood once the reaction has begun.
Explanation
Correct Response: C. Keeping the sash lowered is necessary in order to contain fumes produced by the reaction within the exhaust hood. A is incorrect because using Bunsen burners within the fume exhaust hood does not present a safety hazard and is a necessary part of performing the experiment. B is incorrect because turning off the fan would prevent the removal of undesired fumes by the exhaust hood (the exhaust hood cannot work when it is off). D is incorrect because stepping away from the fume exhaust hood would prevent the student from being able to manipulate the experiment within the exhaust hood and is not a necessary method for avoiding exposure to fumes.
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