Acids react with most metals to form a salt and hydrogen gas. ... For example, zinc metal reacts with hydrochloric acid producing zinc chloride and hydrogen gas. \[\ce{Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)}\] Bases react with certain metals like zinc or aluminum for example to also produce hydrogen gas.
For the temperature to go down, the average kinetic energy must decrease which means that the kinetic energy of the gas molecules must decrease. Since energy is neither created nor destroyed, and energy is not "lost" due to gas molecule collisions (they are elastic), then the KE must be transferred to the molecules of some other substance at a lower temperature.
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Answer:
During separation of substances with different boiling points, fractional distillation is used.
During separation of substances in an eutectic mixture or azeotropic mixture, steam distillation is used.
Ionic Bonds have a Lower melting and Covalent have higher.