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REVISIT THE PHENOMENON
Why is this volcano
spewing bright blue flames?
CER
Claim, Evidence, Reasoning
Explain Your Reasoning
Revisit the claim you made when you encountered the
phenomenon. Summarize the evidence you gathered from your investigations and
research and finalize your Summary Table. Does your evidence support your claim? If not,
revise your claim. Explain why your evidence supports your claim.
STEM UNIT PROJECT
Now that you’ve completed the module, revisit your STEM unit project. You will
summarize your evidence and apply it to the project.
Module Wrap-Up
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THREE-DIMENSIONAL THINKING
GO FURTHER
Data Analysis Lab
How is compressed gas released?
Tanks of compressed gases are common in chemistry laboratories.
For example, nitrogen is often flowed over a reaction in progress to
displace other gases that might interfere with the experiment. Given
what you know about gases, explain how the release of compressed
nitrogen is controlled.
CER
Analyze and Interpret Data
The particles of gases are far apart, and gases tend to fill their
containers—even if the container is a laboratory room. Tanks of
compressed gas come from the supplier capped to prevent the gas
from escaping. In the lab, a chemist or technician attaches a
regulator to the tank and secures the tank to a stable fixture.
1.
Claim
Explain why the flow of a compressed gas must be
controlled for practical and safe use.
2.
Evidence, Reasoning
Predict what would happen if the valve on a
full tank of compressed gas were suddenly opened all the way or
if the tank were accidentally punctured. Explain your prediction.
Module 2 • Matter—Properties and Changes
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