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Useful: Energy Light Sound Non-Useful: Electricity C02
That would be "heat", except that sometimes heat can be quite useful.
high-energy electrons
Energy will, but "useful" energy will not, as the available energy gets dissipated through expanding space. This is referred to as the heat death of the universe.
yes some chemical reactions are harmful to us. as digestion of food, photosynthesis, decomposition of organic waste are some examples of the useful chemical reactions.