Give the colour and state shown by chlorine at room temperature and pressure.
State the use of chlorine in treating the domestic water supply.
Use the information in Table 5.1 to deduce the physical state of iodine at 195^{\circ}C. Give a reason for your answer.
State one more physical property of potassium.
Describe what is seen when potassium is added to water.
Describe a test for hydrogen. test; what is seen.
Complete the symbol equation shown below. ...... K + ............ → 2K2O
Choose the pH value of the solution made when solid potassium oxide is dissolved in water. Circle your selected answer. pH1 pH5 pH7 pH12
Complete the dot-and-cross diagram in Fig. 5.1 for potassium chloride to show the electronic configuration of each ion and the charge on each ion.