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Answer:
1 No. Two atoms of the same chemical element are typically not identical. ... Since the states of the electrons in an atom are what determine the nature of the chemical bonding that the atom experiences, two atoms of the same element can react differently if they are in different states.
2 Yes, water can stay liquid below zero degrees Celsius. There are a few ways in which this can happen. The freezing point of water drops below zero degrees Celsius as you apply pressure. ... When we apply pressure to a liquid, we force the molecules to get closer together.
3 Diamond can indeed be set on fire since it is made of carbon. ... The ignition temperature of wood is about 300 degrees C while the ignition temperature of diamond in air is about 900 degrees C. Although diamond requires a higher temperature to burn, it does indeed burn via normal carbon combustion.