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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

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CHEM 1211K Lab Fall 2020

Fundamentals of Chemistry (Week of August 24

) 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

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

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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Tags: Fundamentals of Chemistry Introduction to Virtual Lab volume of liquid Volumetric Glassware Gradations Standard Deviation Calculation