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When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
Best Answer: Heat provides energy for the water molecules to move about more rapidly. As a result, many of the molecular bonds present in the liquid (water) are broken. These broken bonds result in molecules being spaced out which forms a gas. In the case of water, this gas is what we know as steam. That's the chemical side of it (sort of). As for what would visibly happen when water is heated, it depends on the temperature. The water would boil at 100 degrees celsius which would lead to bubbling and evaporation. Steam is formed.