Cho m gam hỗn hợp (A) gồm Zn và Fe vào dung dịch HCl dư, thu được 1,12 lít khí hidro. Nếu cho m gam hỗn hợp (A) vào dung dịch CuSO4 dư. Phản ứng xảy ra xong thì số gam kết tủa thu được là: A. 0,8 gam B. 3,2 gam C. 1,6 gam D. 6,4 gam

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.