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CHEM 1211K Georgia Tech Fundamentals of Chemistry Lab

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Chemistry
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Georgia Institute of Technology
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CHEM 1211K Lab Fall 2020
1
Fundamentals of Chemistry (Week of August 24
th
) Post-lab
Submission Guide
Directly edit this document with responses below each question. Type your answers in BLUE
font. All answers should be typed, and all chemical reactions, calculations, and
mathematical expressions should be entered using Equation Editor, LaTeX, etc. When your
answers are complete, upload this document to Canvas under “Assignments.”
Post-labs are due by the start of your next lab period.
Post-Lab Questions
Activity A: Introduction to Virtual Lab
In the simulation in part A, you calculated the density of NaCl with the volume measured using a
volumetric pipet and a graduated cylinder. In the simulation, the volumes delivered were
extremely close. This wouldn’t necessarily be true in a real laboratory.
Accuracy is how closed a measurement is to the true value. Precision is how closely
measurements are grouped together.
Question 1
Which piece of glassware do you think you should use to deliver a volume of liquid more
accurately? Explain your answer.
To deliver a volume of liquid more accurately, a serological pipette can be used. The double gradated
markings for dispensing and collecting liquids means that there is a more accurate receiving of liquid and
pouring it out.
Question 2
The simulation in Part A doesn’t have you read the graduated cylinder volume from the
gradations, which is actually a really important skill. Indeed, the ability to accurately read
volumes from several different pieces of glassware is a key component of achieving accurate
results in lab.
Volumetric glassware gradations are the lines etched into the glassware, where the space
between two lines represents a set amount of liquid. The general rule of thumb is that glassware
should be read to one significant figure more than its smallest gradation. In other words, you
should estimate one place further than what you can read definitively. If the smallest gradations

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CHEM 1211K Lab Fall 2020
2
are 1 mL, you should report the value to the closest tenth of a mL. If gradations are to the 0.1
mL, then you should report to the hundredths place.
http://www.thephysicsaviary.com/Physics/Programs/Games/GraduatedCylinder/index.html
1. Open the simulation and click on Begin (you do not have to enter your name, but you are
welcomed to!)
2. For each measurement, record the value of the gradations (e.g., 20 mL, 1 mL, 0.1 mL) as
well as your estimated volume. To check your estimation, click “check” below the boxes.
3. Record 10 measurements, indicating those that you got correct and those you did not. If
you got less than 5 correct, continue taking measurements until you have 5 correct.
Gradation (mL) Volume (mL) Correct?
Measurement 1 2 84 yes
Measurement 2 2 52 no
Measurement 3 5 27 yes
Measurement 4 1 18.1 yes
Measurement 5 0.25 3.1 yes
Measurement 6 1 4.4 yes
Measurement 7
Measurement 8
Measurement 9
Measurement 10
Question 3
The same rule for reading glassware applies to analog thermometers; that is, you should estimate
one digit beyond what you can read for certain.
http://www.thephysicsaviary.com/Physics/Programs/Games/ReadTheThermometerChallenge/ind
ex.html
1. Open the simulation and click on Begin (you do not have to enter your name, but you are
welcomed to!)
2. For each measurement, record the value of the gradations (e.g., 1
o
C) as well as your
estimated temperature.
4. Record 8 measurements, indicating those that you got correct and those you did not. If
you got less than 5 correct, continue taking measurements until you have 5 correct.

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CHEM 1211K Lab Fall 2020 Fundamentals of Chemistry (Week of August 24th) Post-lab Submission Guide Directly edit this document with responses below each question. Type your answers in BLUE font. All answers should be typed, and all chemical reactions, calculations, and mathematical expressions should be entered using Equation Editor, LaTeX, etc. When your answers are complete, upload this document to Canvas under “Assignments.” Post-labs are due by the start of your next lab period. Post-Lab Questions Activity A: Introduction to Virtual Lab In the simulation in part A, you calculated the density of NaCl with the volume measured using a volumetric pipet and a graduated cylinder. In the simulation, the volumes delivered were extremely close. This wouldn’t necessarily be true in a real laboratory. Accuracy is how closed a measurement is to the true value. measurements are grouped together. Precision is how closely Question 1 Which piece of glassware do you think you should use to deliver a volume of liquid more accurately? Explain your answer. To deliver a volume of liquid more accurately, a serological pipette can be used. The double gradated markings for dispensing and collecting liquids means that there is a more accurate receiving of liquid and pouring it out. Question 2 The simulation in Part A doesn’t have you read the graduated cylinder volume from the gradations, which is actually a really important skill. Indeed, the ability to accurately read volumes from s ...
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