几道英文版的化学题1.In a laboratory experiment,students are asked to

几道英文版的化学题
1.In a laboratory experiment,students are asked to determine the ralative amounts of benzoic acid and charcoal in a solid mixture.Benzoic acid is relatively soluble in hot water,but charcoal is not.Devise a method for separating the two components of this mixture.
2.Discuss the similarities and differences between a liquid and a gas.
P.S:铁是混合物吗?
3.Explain the differences among solids,liquids,and gases both macroscopically and microscopically.