A teaspoon of caffeine is <em>NOT</em> deadly as teaspoon of ricin
Answer:
Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Hot water is less dense and will float on room-temperature water. <u>Cold water is more dense and will sink in room-temperature water.</u>
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The answer is number 1 - energy is emitted
Energy is released when an atom in an excited state returns to the ground state.
