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QR Challenge: Thermal Physics Review

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. 1.A gas is in a cylinder and maintained at a pressure of 15000 Pa. When 400,000 J of heat is added to the gas, the volume expands from 10.0 m3 to 17.3 m3. Calculate the change in internal energy.290.5 kJ
2. 2.3 moles of carbon dioxide (CO2 m = 44.01 u) have a temperature of 18oC. Find the average velocity of the molecules.406.2 m/s
3. 3.If 61.5 L of oxygen at 18oC and an absolute pressure of 2.45 atm are compressed to 48.8 L and at the same time the temperature is raised to 50oC, what will the new pressure be?(3.43 atm)
4. 4.10 moles of a gas has a volume of 2 m3 and a pressure of 5 kPa. The gas increases its pressure isovolumetrically to 15 kPa, and then expands isothermally until the pressure drops to 5 kPa again. Draw the PV graph of this process and calculate the net heat change on the gas.(63 kJ)
5. 5.An ideal gas expands isobarically of 3.0 atm from 400 mL to 660 mL. Heat then flows out of the gas at constant volume, and the pressure and temperature drop until the temperature is at the original value. Calculate the total work done and the total heat flow into the gas.(W=79 J, Q = 79 J)
6. 6.A container of water at 50°C is mixed with another container of water at 100°C in a well-insulated container. If 80 kJ of Heat is transferred and the resulting water is at 75oC, calculate the net change in entropy of the system.(366 J/K)
7. 7.One end of a 55 cm long cylindrical copper rod (k = 380 J/smK) with a radius of 0.04 m is kept at 500oC, and the other is immersed in water at 18oC. Calculate the heat conduction rate in the rod.(1674 W)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=1.A-gas-is-in-a-cylinder-and-maintained-at-a-pressure-of-15000-Pa.-When-400,000-J-of-heat-is-added-to-the-gas,-the-volume-expands-from-10.0-m3-to-17.3-m3.-Calculate-the-change-in-internal-energy.

Question 1 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=2.3-moles-of-carbon-dioxide-(CO2-m-=-44.01-u)-have-a-temperature-of-18oC.-Find-the-average-velocity-of-the-molecules.

Question 2 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=3.If-61.5-L-of-oxygen-at-18oC-and-an-absolute-pressure-of-2.45-atm-are-compressed-to-48.8-L-and-at-the-same-time-the-temperature-is-raised-to-50oC,-what-will-the-new-pressure-be?

Question 3 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=4.10-moles-of-a-gas-has-a-volume-of-2-m3-and-a-pressure-of-5-kPa.-The-gas-increases-its-pressure-isovolumetrically-to-15-kPa,-and-then-expands-isothermally-until-the-pressure-drops-to-5-kPa-again.-Draw-the-PV-graph-of-this-process-and-calculate-the-net-heat-change-on-the-gas.

Question 4 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=5.An-ideal-gas-expands-isobarically-of-3.0-atm-from-400-mL-to-660-mL.-Heat-then-flows-out-of-the-gas-at-constant-volume,-and-the-pressure-and-temperature-drop-until-the-temperature-is-at-the-original-value.-Calculate-the-total-work-done-and-the-total-heat-flow-into-the-gas.

Question 5 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=6.A-container-of-water-at-50°C-is-mixed-with-another-container-of-water-at-100°C-in-a-well-insulated-container.-If-80-kJ-of-Heat-is-transferred-and-the-resulting-water-is-at-75oC,-calculate-the-net-change-in-entropy-of-the-system.

Question 6 (of 7)

 


Thermal Physics Review: QR Challenge

https://www.classtools.net/QR/decode.php?text=7.One-end-of-a-55-cm-long-cylindrical-copper-rod-(k-=-380-J/smK)-with-a-radius-of-0.04-m-is-kept-at-500oC,-and-the-other-is-immersed-in-water-at-18oC.-Calculate-the-heat-conduction-rate-in-the-rod.

Question 7 (of 7)