State the substance that: (i) turns pink when water is added to it (ii) is a non-metal used as a lubricant (iii) is used to neutralise acidic industrial waste (iv) is obtained from bauxite (v) serves as an electrical insulator.
Some state changes of sodium are shown. The diagram shows solid sodium ⇄ liquid sodium ⇄ sodium gas. The arrow from solid sodium to liquid sodium is labelled A. The arrow from liquid sodium to solid sodium is labelled freezing. The arrow from liquid sodium to sodium gas is labelled evaporation. The arrow from sodium gas to liquid sodium is labelled B. (i) State the names of the changes of state represented by A and B. (ii) Using the kinetic particle model, describe how the particles are arranged and how far apart they are in solid sodium and in liquid sodium.