Make two paper cups by folding a sheet of paper. Pour about 50 mL of water in one of the cups. Heat both the cups separately with a candle. What do you observe?
a. What happens to the empty paper cup and why?
b. What happens to the paper cup with water and why?
c. Does water in this cup become hot?
Answers
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2
You will observe the one without water to start burning rapidly and the water will start boiling in the one with water. When the candle have transferred approximately 20,5 kJ of energy to the water (if we assume that the water is at 4 °C) it will reach 100 °C and then after the candle transferring additionally 113,000 kJ of energy to the water, all the water will have vaporized into steam and the paper mug will catch fire.
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7
Answer:
a)the empty cup burns because paper is a combustile material.
b)the cup with water does not burn as the heat will be absorbed by the water in the cup
c)yes the water in this cup gets heated up.
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