Practical Laboratory Exam, Fall 2022
Important Information:
1. The exam is to be performed individually by each student. No talking is allowed. If
necessary, you may speak ONLY to the TA or Lab staff.
2. You will have 70 minutes to complete the exam. Use your time wisely.
3. The total length of the period is 90 min. You will be required to leave 15 min before the
end of the period. You will be given 5 minutes at the beginning to put your materials
away and settle yourself at your station.
4. There are two parts to be completed. You may complete them in the order of your choice.
5. You have access to any glassware/equipment in your locker. You will need to bring a
paper, pen, calculator, and a device that will permit you to access LabFlow during the
exam time.
6. Please review the attached equipment list. It will be your decision as to which equipment
and/or glassware to use. During the first FIVE minutes of the period, CHECK your
locker!! If something you need is missing, inform your TA immediately.
Part 1: Determination of the Density of a Solid
1. You will be given an unknown solid. Note its unknown number. Without this unknown
number, you cannot receive a grade.
2. Using your choice of equipment, glassware, the unknown solid and water, determine the
density of the unknown solid (in g/cm3). You may use the method of your choice to
accomplish this task.
Part 2: Determination of the Density of a Liquid
1. You will be assigned a fixed volume of an unknown solution. Note its unknown number.
Without this unknown number, you cannot receive a grade.
2. Using your choice of equipment, glassware, and the unknown solution, determine the
density of the unknown solution (in g/mL). You may use the method of your choice to
accomplish this task.
Considerations:
1. Work carefully but quickly.
2. Consider your choice of equipment and glassware in the lab.
3. Consider how many measurements you should make.
Results:
1. Once you have determined your densities, open LabFlow.
2. Go to the Practical Lab Exam tab. Your access to the Submission folder in the Practical
Lab Exam tab in LabFlow will begin at the start of your lab and will end 80 min later.
3. Enter the required information in the appropriate spaces.
4. CHECK your answers before submitting them. Once you submit, you cannot change
anything.
5. Best of luck!
Contents of the General Chemistry Locker, 2022
Contenus du Casier de Chimie Générale, 2022
ITEM / ARTICLE
SIZE
No.
Grandeu
r
1. clamp holder / noix de pince
3
2. Extension clamp/pince d’extension
1
3. universal clamp / pince universelle
2
4. Erlenmeyer flask / Fiole conique
125 ml
2
5. beaker/ bécher
50ml
3
6. beaker / bécher
150 ml
2
7. beaker / bécher
250 ml
1
8. beaker / bécher
400 ml
1
9. beaker / bécher
600 ml
1
10. graduated cylinder / cylindre gradué
10 ml
2
11. graduated cylinder / cylindre gradué
50 ml
1
12. watch glass / verre de montre
75 mm
3
13. wash bottle / pissette
250 ml
2
14. funnel / entonnoir
60 mm
1
15. test tube holder / pince à éprouvette
1
16. test tube rack / support à éprouvette
1
17. crucible tongs / pince à creuset
1
18. spatula / microspatule
1
19. scoopula / spatule
1
20. teflon rod / tige de teflon
2