matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Gas particles are spread farther apart and move faster than solids or liquids. ... The average speeds and kinetic energies of gas particles increase with an increase in temperature and decrease with a decrease in temperature.
