Consider the example below👁🗨
2.13 Describe the relative reactivities of the elements in Group 7
2.14 Describe experiments to demonstrate that a more reactive halogen will displace a less reactive halogen from a solution of one of its salt
2.15 Understand these displacement reactions as redox reactions
2.13🤔
The reactivity of Group 7 elements decreases as we move down the group.
❗️❕Further Explanation:
When moving down the group, the atoms get larger thus the outermost shell gets further from the nucleus.
As a result, the attraction between the nucleus and electrons gets weaker, so an electron is less easily gained.
2.14 and 2.15🤔
Experiment 1
Displacement Reaction of Chlorine and Potassium Bromide
2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(aq)
- More reactive chlorine displaces the less reactive bromine
- It is a redox reaction as bromide is being oxidized and chlorine is being reduced
Experiment 2
Displacement Reaction of Chlorine and Potassium Iodide
2KI(aq) + Cl2(g) → 2KCl(aq) + I2(aq)
- More reactive chlorine displaces the less reactive iodine
- It is a redox reaction as iodine is being oxidized and chlorine is being reduced
Experiment 3
Displacement Reaction of bromine and sodium bromide
- More reactive chlorine displaces the less reactive bromine
- It is a redox reaction as bromide is being oxidized and chlorine is being reduced
Lastly, here is a sample question🧐
The answer is B as only the reactions of I and III is possible
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