# CHEM 121 Highline Community College Metric System Length and Volume Worksheet

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Science

chem 121

Highline Community College

CHEM

## Description

3.) DATA Investigating length and volume

Based on the measurements show in videos / images, provide the following data:

Volume by calculation:
length = cm
# signficiant figures =

width = cm
# signficiant figures =

thickness = cm
# signficiant figures =

Volume by calculation = cm3

Volume by Displacement
initial (w/out metal)= mL
# decimal places =

final (with metal) = mL
# decimal places =

Volume by Displacement = mL

4.) DATA Part D: Investigating the accuracy of beakers

A beaker was carefully filled to place the bottom of the meniscus at the 40-mL line.

Then, the water was carefully poured into a graduated cylinder, as shown below.

What is the correct value for the volume of water measured as 40 mL in the beaker?

Volume from image above: mL

In another measurement, the beaker filled to the 40 mL line contained 37.5 mL. In our class video, what was the volume reading when the water from the beaker was measured in the graduated cylinder?

Volume from video measurement: mL

How accurate are beakers for measuring precise volumes?

5.) Compare the masses you measured for the four objects in Part A, as measured by the analytical balance versus the top-loading balance. describe any similarities and/or differences for the masses measured from the two balances.

6.) Compare the volume of your unknown metal calculated using two different methods in Part B. (The units may seem different, but remember that 1 cm3 = 1 mL, so they are actually the same.) Are the two volumes similar? Give and example of an object for which it would be better to determine its volume by water displacement rather than by calculation.

7.) Suppose a student was performing Part B step 6 of this experiment. He correctly read and recorded the initial volume of water in the graduated cylinder, but when he dropped the metal sample into the water, several drops of water splashed out of the cylinder. He chose to ignore this splashing and recorded the final volume. How would his volume of the metal object be affected?
As a result of his error would be the calculated volume be too high or too low? Explain why.

Part B step 5 required you to record the actual volume of liquid measured in a 50-mL graduated cylinder. Circle all of the following sample measurements that are NOT appropriate using a 50-mL graduated cylinder.

Measurement photos of the Al block are attached below.

Videos you need:

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Chemistry questions
3.) DATA Investigating length and volume
Based on the measurements show in videos / images, provide the following data:
Volume by calculation:
length = 5.00 cm
# signficiant figures = 3
width = 1.28 cm
# signficiant figures = 3
thickness = 1.28 cm
# signficiant figures = 3
Volume by calculation = 8.192 cm3
cm3 Volume by Displacement initial (w/out metal)= 30.0 mL
# decimal places = 1
final (with metal) = 38.5 mL
# decimal places = 1
Volume by Displacement = 8.5 mL

4.) DATA Part D: Investigating the accuracy of beakers A beaker was carefully filled to place the
bottom of the meniscus at the 40-mL line.
What is the correct value for ...

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