Chemistry 0620: AIR AND WATER Topical Past Paper Questions

Iron nails rust slowly in the presence of water and air. When an iron nail rusts, insoluble solid hydrated iron(III) oxide forms. The solid hydrated iron(III) oxide falls off the iron nail. The rusting of iron nails is slowed down by coating the nails with oil or paint. Plan an i…

The three states of matter are solid, liquid and gas. **(a)** Complete Table 1.1 to describe the structures of solids, liquids and gases in terms of particle separation, particle arrangement and particle motion. Table 1.1 [3] **(b)** Substances can physically change. > Name each…

Table 2.1 shows the masses of some of the ions in a $ 1000\,cm^{3} $ sample of river water. Table 2.1 (a) Answer these questions using the information in Table 2.1. (i) Name the negative ion that has the highest concentration. (ii) Name the compound that contains $ NH_{4}^{+} $ a…