（b）Aqueous chlorine reacts with aqueous potassium iodide．（i）Complete the word equation for this reaction．［2］（ii）Explain why aqueous iodine does not react with aqueous potassium bromide． ................................................................................................................................... ［1］

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_w24_qp_31 Year：2024 Question No：5(b)

Answer:

Knowledge points:

7.1.1.1. metals

7.1.1.2. bases

7.1.1.3. carbonates

7.1.10. Define a strong acid as an acid that is completely dissociated in aqueous solution and a weak acid as an acid that is partially dissociated in aqueous solution

7.1.11. State that hydrochloric acid is a strong acid, as shown by the symbol equation,

7.1.12. State that ethanoic acid is a weak acid, as shown by the symbol equation

7.1.2.1. litmus

7.1.2.2. thymolphthalein

7.1.2.3. methyl orange

7.1.3. State that bases are oxides or hydroxides of metals and that alkalis are soluble bases

7.1.4.1. acids

7.1.4.2. ammonium salts

7.1.5.1. litmus

7.1.5.2. thymolphthalein

7.1.5.3. methyl orange

7.1.6. State that aqueous solutions of acids contain

7.1.7. Describe how to compare hydrogen ion concentration, neutrality, relative acidity and relative alkalinity in terms of colour and pH using universal indicator paper

7.1.8. Describe the neutralisation reaction between an acid and an alkali to produce water

7.1.9. Define acids as proton donors and bases as proton acceptors

8.3.1.1. increasing density

8.3.1.2. decreasing reactivity

8.3.2.1. chlorine, a pale yellow-green gas

8.3.2.2. bromine, a red-brown liquid

8.3.2.3. iodine, a grey-black solid

8.3.3. Describe and explain the displacement reactions of halogens with other halide ions

8.3.4. Predict the properties of other elements in Group VII, given information about the elements

Answer:

Knowledge points:

Solution:

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