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Chemistry II Laboratory Exam 1 Questions and and answers (1)
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Chemistry II Laboratory Exam 1 Questions and and answers (1)
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Chemistry II Laboratory Exam 1name 3 pieces of safety equipment contained in the laboratory classroom - ✅✅-1.
eye wash station
2. safety shower
3. first aid kit
name 3 safety rules that apply when you are working in any laboratory - ✅✅-1.
safety eyewear approved for splash protection must be worn at all times
2. Eating, drinking, and smoking are forbidden in the laboratory
3. Shoes must be worn at all times
you are excused from wearing goggles in lab:
A. if you have permission from your doctor.
B. if they are uncomfortable to wear.
✅✅
C. if you are finished with the experiment and are completing the post lab questions.
D. none of the above - -D. none of the above
when heating a substance in a test tube, always point the tube:
A. away from you and toward your partner
B. away from everyone
✅✅-B. away from everyone
C. toward you and your partner
D. toward you and away from your partner -
when using an open flame:
A. do not leave it unintended
B. do not reach over it
✅✅
C. do not wear loose clothing
D. all of the above - -D. all of the above
you should get under the lab safety shower:
A. if you spill chemicals on your hands or fingers
B. if there is a large chemical splash onto your body
✅✅-B. if there is a large
C. if chemicals get splashed into your eyes
D. if there is a large chemical spill on the bench or floor -
chemical splash onto your body
if a laboratory fire erupts, immediately:
A. notify the instructor
, B. run for the fire extinguisher
✅✅
C. throw water on the fire
D. open the windows - -A. notify the instructor
true or false: hot glass looks the same as cold glass - ✅✅-true
true or false: all chemicals in the lab are to be considered dangerous - ✅✅-true
✅✅
true or false: return all unused chemicals to their original container so as not to waste
them - -false
✅✅
true or false: if you cut yourself, but it's a very small cut, you do not need to tell your
professor - -false
✅✅
true or false: a student does not have to wear safety goggles if they wear glasses -
-false
what is beer's law? - ✅✅ -a compound's absorbance of a wavelength is directly
proportional to its concentration
A = ε * c *l
✅✅
if the concentration of a solution is reduced by half, how will this affect the
absorbance of a solution? - -the absorbance will also be reduced by half
a volumetric flask will be used to make your stock solution and dilutions in
experiment 1. Suppose you fill the flask with the desired substance and then
accidentally add distilled water to just above the mark.
a) will the concentration be higher or lower than desired? Explain
b) will you be able to read the new volume? - ✅✅ -a) the concentration will be lower
than desired because the distilled water will dilute the desired substance
b) no, I will not be able to read the new desired volume
an experiment requires you to make 500.00 mL of 0.00019 M Allura Red (MW
✅✅
496.42 g/mol). How many grams of Allura Red would you need to weight out? -
-M = mol/L
0.00019M = x/0.5L
x = 0.00019M * 0.5L
x = 0.000095 mol * 496.42g
x = 0.0472g
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