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Question 1 of 13 marksShort answer🕮 Formulae⚑ Bookmarked
Refer to the experimental scenario below. Explain how thermal energy is transferred between the aluminium and water until thermal equilibrium is achieved.
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Question 1 of 13 marksShort answer🕮 Formulae⚑ Bookmarked
Refer to the experimental scenario below. Explain how thermal energy is transferred between the aluminium and water until thermal equilibrium is achieved.
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Answer withT Text📷 Photo📁 File📱 Phone✎ Draw
Thermal energy transfers from the hotter object to the cooler one. Fast-moving molecules bump into slower ones. They pass their energy along. This continues until all molecules have the same average speed, resulting in the same temperature
37 words
2 / 3 marksWell done✦ Marked by AI
You have a solid grasp of the basics of heat transfer through particle interaction. To reach full marks, just make sure you explicitly mention that the net transfer of energy stops once the temperatures are equal.
Mark allocation
Criteria
Marks
Feedback
Identifies that thermal energy transfers from the hotter aluminium to the cooler water
1 / 1
You clearly identified the direction of energy flow from hot to cold.
Explains the transfer mechanism in terms of particle collisions or kinetic energy exchange between systems
1 / 1
You correctly described the interaction between particles of different speeds.
States that thermal equilibrium is reached when both systems attain the same temperature and net energy transfer stops
0 / 1
You need to explicitly state that the net transfer of energy ceases at equilibrium.
Total
2 / 3
Model answerHide
Thermal energy is transferred from the aluminium block to the water because the aluminium initially has a higher temperature (85°C) than the water (18°C). The particles in the aluminium have greater average kinetic energy and collide with water molecules at the boundary, transferring energy. As energy flows from hot to cold, the aluminium cools and the water warms until both reach the same temperature of 28°C. At thermal equilibrium, the net transfer of thermal energy ceases because the average kinetic energy of particles in both systems is equal, consistent with the zeroth law of thermodynamics.
Feedback on your answerHide
Thermal energy transfers from the hotter object to the cooler one.1Fast-moving molecules bump into slower ones. They pass their energy along.2 This continues until all molecules have the same average speed, resulting in the same temperature.3
✓ Credit (2)− Missing (1)
1✓ Credit · +1 mark earned
You accurately identified the second law of thermodynamics in action here.
2✓ Credit · +1 mark earned
This is a great description of the microscopic process of conduction.
3+ Missing · +1 mark to gain
To get the final mark, you must mention that the net flow of energy stops once equilibrium is reached.
Add: At this point of thermal equilibrium, the net transfer of thermal energy between the aluminium and the water stops.
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Hi there! Let’s break down this answer. You’ve done really well to get most of the way there.
Your answer correctly identified that thermal energy moves from the hotter object to the cooler one. This is a fundamental concept in thermodynamics! You also did a great job explaining how this happens at a microscopic level, with faster molecules bumping into slower ones and transferring energy.
The main thing to add for full marks is to explicitly state that net thermal energy transfer stops once thermal equilibrium is reached. While energy is still exchanged at the molecular level, there’s no overall (net) flow of energy between the aluminium and the water once they are at the same temperature.
Also, it’s good practice to use the term “average kinetic energy” instead of “average speed” when talking about the energy of molecules. This is more precise in a physics context.
Why “average kinetic energy”?What is “net” transfer?What is thermal equilibrium?
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