Describe X, Y and Z by referring to their bonding, how their particles are arranged and how those particles move.
A closed gas syringe contains substance X. Describe how the volume of substance X in the syringe changes when the pressure is raised. The temperature stays constant. Explain your answer in terms of particles.
Substance Z is diamond. Diamond is used in jewellery. Give one other use of diamond.
Substance Y can undergo both physical and chemical changes. Which two of the options below are physical changes? Explain your answer. A Substance Y dissolves readily in water. B An aqueous solution of substance Y gives a white precipitate with acidified aqueous silver nitrate. C Substance Y melts at $801\,^{\circ}\text{C}$. D Substance Y reacts with concentrated sulfuric acid.