t practice (Questions 1-2s are each 1 point 2e 30 are each 3 points) Laboratory
ID: 517779 • Letter: T
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t practice (Questions 1-2s are each 1 point 2e 30 are each 3 points) Laboratory Safe Lab How many fume hoods are in your lab? 2. Wearing lab coats in lab is optional. 3. If you need to leave lah temporarily, you should take offyour lab coat and gloves first. 4. For personal safety, it is particularly important for students to be focused on task A. during the prelab lecture C. when handling chemicals B. when handling glassware all are correct 5. It is poor lab practice to: A. Recap a reagent bottle immediately after dispensing the required quantity. B. Use a spatula and powder funnel to returm excess reagent to the reagent bottle. C. Clean the spatula before and after using it to dispense a solid chemical. D. Recap the waste carboy right after you have disposed of waste liquid chemical 6. The most generally useful decontamination agent in the laboratory is: A. Magnesium carbonate C. Cold water B. Sodium bicarbonate D. Spill kit 7. The most important factor when decontaminating skin after contact with a chemical is: A. Room temperature C. Maintaining modesty Doing so immediately D. Right-sized gloves 8. In lab, liquid concentrated acids should be stored: A. In the acid fume hood C. In the acid-and-base fume hood B. In unvented cabinets under a hood D. On shelves near the balances Goggles must be worn: A. Once the experiment has started C. At all times when in the lab B. Until you pack up to leave lab Except by instructors Which statement is "false in preparing a solution of a specific molarity in a volumetric A. Highest accuracy is obtained by working at the glassware's temperature of calibration B. Quantitative transfer of solid is aided by weighing in a beaker and using a powder fun C) Dissolve the solid completely before adding liquid up to the mark and mixing. Fill the flask to the mark on the neck before adding the solid to be dissolved. When you have finished using a buret you should empty itinto: A. The nearest sink Back into the stock solution bottle into a waste container None of the aboveExplanation / Answer
The answers for the questions from 13) to 20) are as follows.
13) b
14) b
15)
16) d
17) A,B,C, D
18) C
19) B
20) A
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