1.20_6thSci_TE 2.4
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Last updated over 3 years ago
15 Nsɛmmisa
Objectives and Slides
Part 1
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Part 2
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Part 3
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Part 4
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Finished Early?
After learning about how heat energy transfers, Aaron and Leo were asked to explain why freeze ray guns can’t shoot “cold” at people. Read and compare their arguments. Then, answer the questions below.
Aaron's Argument
A freeze ray cannot shoot “cold” because cold can’t be transferred from one thing to another. Only energy can transfer.
Leo's Argument
A freeze ray cannot shoot “cold” because cold is not an object, it is a description of an object whose molecules have a small amount of kinetic energy. In order to make something colder, kinetic energy has to be transferred out of it. Energy always transfers from the warmer thing to the colder thing, so you would have to put an even colder thing next to the person you were shooting so the kinetic energy would transfer out.
Which argument is more convincing?
Why is that argument more convincing?
In a recent SIM trial, a student forgot to turn on the “View Kinetic Energy” button when combining Samples A and B. Although we cannot see the color of the molecules kinetic energy was transferred, we have the graph of Sample A below. It shows the temperature change of Sample A over time as molecules transfer energy.
Analyze:
What does the graph tell you about the temperature of Sample A over time?
Sentence Starter:
This graph tells me...
Infer:
What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?
Sentence Starter:
I can infer that the temperature graph of Sample B....
Part 2A: RUN Mode
Open the Simulation.
Add two samples of equal size.
Turn on the “View Kinetic Energy”.
Make Sample A much hotter than Sample B.
Record the starting temperatures of both samples in the table below.
Add the Starting Temperatures of Sample A and Sample B.
(you do not need to add the Celcius!!)
Turn on the “View Energy Transfer”
Drag the samples together, watch and wait until the energy stops transferring completely.
Go back to the table and record the final ending temperatures of both samples.
Complete the statements below to correctly reflect your observations.
Then, add the Final Temperatures of Sample A and Sample B.
(you do not need to add the Celcius!!)
Fill in the blanks!
The options are: MORE, LESS, THE SAME. DO NOT include numbers.
Before coming into contact, the molecules of Sample A had
Before coming into contact, the molecules of Sample B had
Once they stopped transferring, the molecules of Sample A had
Switch to Analyze mode.
Scroll back the replay to the beginning part right after you made one sample hot and one cold.
Look at the Thermal Energy graph.
Record the thermal energy of the samples at that spot
Scroll forward and record the total thermal energy after it ends.
Record the thermal energy of the samples at the start.
Then, record the thermal energy of the samples at the end!
The thermal energy of Sample A _________ and the thermal energy ______________ of Sample B after contact.
Predict: Why did the transfer of energy between the two samples stop?
When did you see your system in the SIM become stable?
Sentence Starter:
The system became stable when...
Which systems would change once their samples come into contact?
Explain your answer choice(s) for the question above.
Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.
(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)
Explain your answer choice(s) for the question above.
Finished early?
Please note that I will start marking your assignments as MISSING if you FORGET TO SUBMIT.
You SHOULD NOT be playing any of these if you did not complete your Key Takeaway tracker document. Your computer will be locked.
Try these: