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Why does the mass of a substance remain the same after a chemical reaction?

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

Explaining why atoms bondcomplete the sentence. atoms form chemical bonds to satisfy the    rule and to become  .