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Physical Science with Earth and Science
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Thermal Equilibrium
Worksheet
Grade Level
Physical Science with Earth and Science
9.67 Thermal Equilibrium
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A student mixes 90 g of water at 80°C with 10 g of water at 20°C in an insulated cup and predicts 35°C. What is the best evaluation?
A
The final temperature must be above 80°C because the hot sample has more mass.
B
The prediction is too low; the final temperature should be closer to 80°C because most of the water is hot.
C
The prediction is too high; the final temperature must be closer to 20°C.
D
The prediction is correct because the temperatures 80°C and 20°C always average to 35°C.
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