A student compares the reactivity of the elements bromine, chlorine and iodine. He mixes these pairs of solutions and observes the reactions that occur.• chlorine solution and potassium bromide solution• bromine solution and potassium iodide solutionExplain how the reactions can be used to show the order of reactivity of the three elements.Include the colour change that the student would observe in each reaction.
Question
A student compares the reactivity of the elements bromine, chlorine and iodine. He mixes these pairs of solutions and observes the reactions that occur.• chlorine solution and potassium bromide solution• bromine solution and potassium iodide solutionExplain how the reactions can be used to show the order of reactivity of the three elements.Include the colour change that the student would observe in each reaction.
Solution
The reactivity of halogens (such as bromine, chlorine, and iodine) can be determined by observing displacement reactions. In a displacement reaction, a more reactive halogen will displace a less reactive halogen from a solution of its salts.
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Chlorine solution and potassium bromide solution: Chlorine is more reactive than bromine. Therefore, when chlorine is added to a solution of potassium bromide, it will displace the bromine. The solution will change from colourless to orange, indicating the presence of bromine.
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Bromine solution and potassium iodide solution: Bromine is more reactive than iodine. Therefore, when bromine is added to a solution of potassium iodide, it will displace the iodine. The solution will change from colourless to brown, indicating the presence of iodine.
From these reactions, we can conclude that the order of reactivity is: Chlorine > Bromine > Iodine. This is because chlorine can displace both bromine and iodine, while bromine can only displace iodine.
Similar Questions
6. The halogens are a group of elements showing trends in colour, state and reactionwith other halide ions.a Copy and complete the word equation for the reaction of chlorine with aqueouspotassium bromide.chlorine + potassium bromide →b Explain why an aqueous solution of iodine does not react with potassium chloride.
describe the nature of the compoundsformed when chlorine, bromine and iodine react with metals andnon-metals
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The diagram below shows the reaction between potassium and bromine.Describe, in terms of electrons, what happens when a potassium atom reacts with a bromine atom to produce potassium bromide.Potassium will lose one electron to form a -1 ion.Bromine will gain one electron to form a +1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will gain one electron to form a -1 ion.Bromine will gain one electron to form a +1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will lose one electron to form a +1 ion.Bromine will gain one electron to form a -1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will gain one electron to form a +1 ion.Bromine will lose one electron to form a -1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.
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