Explain why silicon is placed in Group IV. Answer in terms of electronic configuration.
Use Table 5.1 to work out the physical state of tin at 175^{\circ}C. Give a reason for your answer.
State the colour and physical state of iodine at room temperature and pressure.
Describe what you observe when calcium is added to water.
Complete the word equation for the reaction between calcium and water: calcium + water → [blank] + [blank].
Choose the pH of dilute nitric acid. Circle your answer: pH1, pH7, pH9, pH13.
Complete the equation for the neutralisation of an acid to produce water. $\mathrm{H^+ + \underline{\hspace{1cm}} \rightarrow H_2O}$
State the colour change of the methyl orange indicator as lithium carbonate is added to the dilute nitric acid in the flask.
Describe a test to show that $\mathrm{Li^+}$ ions are present in the solution. Include test and observations.
Complete the dot-and-cross diagram in Fig. 5.1 for lithium chloride to show the electronic configuration of each ion and the charge on each ion. Use crosses to represent lithium’s electrons.