Do walnuts burn?

Do walnuts burn?

The energy released by the burning walnut is used to heat water.

01:37

Chemistry

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test tube, water, walnut kernel, thermometer, torch, Pour some water into a test tube and place a thermometer in it., Measure the temperature of the water., Set a walnut kernel on fire., Start heating the water in the test tube with the burning walnut kernel., At the end of the experiment, measure the temperature of the water in the test tube again., The walnut kernel is flammable. When ignited, its burning produces a great amount of heat energy which can be used to heat water., Why did the water in the test tube heat up?
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