This question is about Group 7 elements.
Chlorine is more reactive than iodine.
Name the products formed when chlorine solution reacts with potassium iodide solution
[1 mark]
ANSWER
Potassium chloride and iodine
Explain why chlorine is more reactive than iodine.
[3 marks]
ANSWER
Chlorine’s outer shell electrons is closer to the nucleus so the chlorine nucleus has greater attraction for valence electron so chlorine gains an electron more easily as compared to iodine, hence more reactive than iodine.
Chlorine reacts with hydrogen to form hydrogen chloride. Explain why hydrogen chloride is a gas at room temperature.
[3 marks]
ANSWER
Hydrogen chloride is made of small molecules and has weak intermolecular forces which requires little energy to overcome the said forces and hence exist in gas state at room temperature
Bromine reacts with methane in sunlight.
Figure 9 shows the displayed formulae for the reaction of bromine with methane.
Figure 9
Table 3 shows the bond energies and the overall energy change in the reaction.
Table 3
Calculate the bond energy X for the C-Br bond.
Use Figure 9 and Table 3.
[4 marks]
ANSWER
Therefore,
i.e.
