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Group 7

Descrição

FlashCards sobre Group 7, criado por Caitlyn Jones em 10-12-2017.
Caitlyn Jones
FlashCards por Caitlyn Jones, atualizado more than 1 year ago
Caitlyn Jones
Criado por Caitlyn Jones aproximadamente 7 anos atrás
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Resumo de Recurso

Questão Responda
What is the equation for the reaction of Cl₂ and COLD & DILUTE NaOH? What word can be used to describe the results? Cl₂ + 2OH⁻ → ClO⁻ + Cl⁻ + H₂O Disproportination
What is the equation for the reaction of Cl₂ and HOT & CONCENTRATED NaOH? 3Cl₂ + 6OH⁻ → ClO₃⁻ + 5Cl⁻ + 3H₂O
What are the uses of: Sodium (I) Chlorate? Sodium (V) Chlorate? Sodium Chloride? Sodium (I) Chlorate = Bleach Sodium (V) Chlorate = Weedkiller Sodium Chloride = Food industry - "Salt"
What is the general formula for the reactions of sodium halides with concentrated sulphuric acid? What are the general observations? NaX + H₂SO₄ → HX + NaHSO₄ Misty fumes (steamy) vapour - Acidic (fume cupboard)
What is produced and observed during the reaction with NaCl and H₂SO₄? HCl - Misty fumes
What is the explanation for these products? Concentrated H₂SO₄ will not oxidise chloride Cl⁻ ions to Chlorine Cl₂ as it is a weaker oxidising agent than chlorine. Chloride ions cannot reduce the sulphur.
What is produced and observed during the reaction with NaBr and H₂SO₄? HBr - Misty fumes Br₂ - Orange/brown fumes SO₂ - Colourless choking gas
What is the explanation for these products? Concentrated H₂SO₄ will oxidise bromide Br⁻ ions to Bromine Br₂ as it is a stronger oxidising agent than bromine. Bromide ions reduce the S in H₂SO₄ - H₂SO₄ → SO₂ +6 +4
What is produced and observed during the reaction with NaI and H₂SO₄? HI - Misty Fumes I₂ - Purple vapour I₂ - Shiny grey solid SO₂ - Colourless choking gas S - Yellow solid H₂S - Rotten egg smell
What is the explanation for these products? Concentrated H₂SO₄ will oxidise iodide I⁻ ions to Iodine I₂ as it is a stronger oxidising agent than iodine. Iodide ions reduce the S in H₂SO₄ - S = +6 H₂SO₄ → SO₂ S = +4 → S S = 0 → H₂S S = -2
Can Chloride Cl⁻ ions reduce: Bromine Br₂? Iodine I₂? Both no
Can Bromide Br⁻ ions reduce: Chlorine Cl₂? Iodine I₂? Chlorine - Yes Iodine - No
Can Iodide I⁻ ions reduce: Chlorine Cl₂? Bromine Br₂? Both yes
What are the reagents used to test for halide ions? Can you give a general equation? Reagents:- Nitric acid and Silver nitrate solution Equation:- Ag⁺ (aq) + X⁻ (aq) → AgX (s)
What further test can be carried out to distinguish between the halide ions? Place the silver halide in both dilute and concentrated NH₃ to assess its solubility
What is produced when Chloride Cl⁻ are used? What observations are seen? What is its solubility in NH₃? AgCl produced - White ppt. Soluble in both dilute and concentrated NH₃.
What is produced when Bromide Br⁻ are used? What observations are seen? What is its solubility in NH₃? AgBr produced - Cream ppt. Insoluble in dilute NH₃. Soluble in concentrated NH₃.
What is produced when Iodide I⁻ are used? What observations are seen? What is its solubility in NH₃? AgI produced - Pale yellow ppt. Insoluble in both dilute and concentrated NH₃.

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