For Questions 9- 18-circle the best response 9. After weighing a solid substance

Question

For Questions 9- 18-circle the best response 9. After weighing a solid substance for an experiment, the excess material removed from the container must be: a. discarded b. returned to the container c. taken home d. used in another experiment so it is not wasted 10. Which should be completed before leaving the lab? a. wipe down bench surfaces b. return equipment to where you found it c. rinse glassware with soapy water, then tap water d. all of the above 11. Never use flammable materials a. in an introductory chemistry lab b. near an open flame c. in a fume hood d. both b) and c) 12. Proper protective safety attire includes a. goggles b. lab apron or lab coat c. closed toe shoes d. long pants e. all of the above 13. Laboratory chemicals can be tasted: a. never b. when they smell good c. when the student knows it is safe d. when they are known to contain nutritious molecules 14. A laboratory gas burner a. can be used to quickly heat acetone b. must be used in the fume hood c. is lit by using a flint striker d. can be used to toast marshmallows for an "end-of-semester party 15. Which of the following is acceptable lab behavior a. trying out an interesting experiment during regular class b. wearing loose long hair while working with a Bunsen burner c. pouring organic solvents down the drain d. smelling a sample indirectly only, by 'wafting 16. Test tubes in a chemical reaction a. are discarded after use b. heated by placing them directly on a hot plate c. heated by pointing the mouth of the test tube in a safe direction away from the students and others in the lab group d. all of the above

Explanation / Answer

These are standard answers: I am just providing the correct options:
9 d
10 d
11 b
12 e
13 a
14 b
15 a
16 c

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