{"id":10556,"date":"2026-09-26T11:34:27","date_gmt":"2026-09-26T10:34:27","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/"},"modified":"2026-09-26T11:34:27","modified_gmt":"2026-09-26T10:34:27","slug":"3-1-3-the-halogens","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/","title":{"rendered":"3.1.3 The Halogens"},"content":{"rendered":"\n<div class=\"ols-ocr313-page\">\n\n  <aside class=\"ols-sidebar\">\n  <div class=\"ols-sidebar-header\">\n    <h3>Revision Notes<\/h3>\n    <p>A Level Chemistry<\/p>\n  <\/div>\n\n  <div class=\"ols-topic-group\">\n    <h4>3.1.3 The Halogens<\/h4>\n\n    <ul class=\"ols-topic-list\">\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/\">3.1.3 Overview<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/trends-in-the-halogens\/\">Trends in the Halogens<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/halogens-as-oxidising-agents\/\">Halogens as Oxidising Agents<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/disproportionation-reactions-of-chlorine\/\">Disproportionation Reactions of Chlorine<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/halide-ions-reducing-agents-and-tests\/\">Halide Ions: Reducing Agents and Tests<\/a>\n      <\/li>\n    <\/ul>\n  <\/div>\n\n  <div class=\"ols-topic-group\">\n    <h4>Other Sections<\/h4>\n\n    <ul class=\"ols-topic-list\">\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/2-1-5-redox\/\">2.1.5 Redox<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-2-group-2\/\">3.1.2 Group 2<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-4-qualitative-analysis\/\">3.1.4 Qualitative Analysis<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/2-1-4-acids\/\">2.1.4 Acids<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-1-periodicity\/\">3.1.1 Periodicity<\/a>\n      <\/li>\n      <li>\n        <a 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linear-gradient(135deg, #fdf4ff 0%, #d8b4fe 45%, #7e22ce 100%); }\n  <\/style>\n\n  <!-- BREADCRUMB BAR -->\n  <div class=\"ols-ocr313-breadcrumb-bar\">\n    <div class=\"ols-ocr313-container\">\n      <nav class=\"ols-ocr313-breadcrumb\" aria-label=\"Breadcrumb\">\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/\">Revision Notes<\/a> \/\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/\">A Level Chemistry<\/a> \/\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/\">OCR<\/a> \/\n          <span>3.1.3 The Halogens<\/span>\n        <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- INTRO -->\n  <section class=\"ols-ocr313-intro\">\n    <div class=\"ols-ocr313-container\">\n      <div class=\"ols-ocr313-intro-inner\">\n        <div>\n          <div class=\"ols-ocr313-eyebrow\">OCR A Level Chemistry A<\/div>\n          <h1>3.1.3<br>The Halogens<\/h1>\n          <div class=\"ols-ocr313-accent-bar\"><\/div>\n          <p class=\"ols-ocr313-intro-lead\">Section 3.1.3 covers the halogens as diatomic molecules and the trend in their boiling points, the s\u00b2p\u2075 outer shell and the formation of 1\u2212 ions, the trend in reactivity shown by displacement reactions and explained by atomic radius and shielding, disproportionation in the reactions of chlorine with water and with cold dilute sodium hydroxide, the benefits and risks of chlorine in water treatment, and the precipitation reactions of the halide ions with silver ions followed by ammonia.<\/p>\n        <\/div>\n        <div class=\"ols-ocr313-info-grid\">\n          <div class=\"ols-ocr313-info-card\"><div class=\"ols-ocr313-info-card-label\">Exam Paper<\/div><div class=\"ols-ocr313-info-card-value\">Paper 1 &amp; 3<\/div><div class=\"ols-ocr313-info-card-sub\">H432\/01 and H432\/03<\/div><\/div>\n          <div class=\"ols-ocr313-info-card\"><div class=\"ols-ocr313-info-card-label\">Specification Points<\/div><div class=\"ols-ocr313-info-card-value\">3.1.3 (a) &#8211; (g)<\/div><div class=\"ols-ocr313-info-card-sub\">7 learning outcomes<\/div><\/div>\n          <div class=\"ols-ocr313-info-card\"><div class=\"ols-ocr313-info-card-label\">Topic Parts<\/div><div class=\"ols-ocr313-info-card-value\">4 pages<\/div><div class=\"ols-ocr313-info-card-sub\">Revision notes available<\/div><\/div>\n          <div class=\"ols-ocr313-info-card\"><div class=\"ols-ocr313-info-card-label\">Exam Board<\/div><div class=\"ols-ocr313-info-card-value\">OCR A<\/div><div class=\"ols-ocr313-info-card-sub\">H432 (2015 onwards)<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- TOPIC CARDS -->\n  <section class=\"ols-ocr313-topics\">\n    <div class=\"ols-ocr313-container\">\n      <div class=\"ols-ocr313-section-header\">\n        <h2 class=\"ols-ocr313-section-title\">Revision Notes<\/h2>\n        <p class=\"ols-ocr313-section-sub\">Work through 3.1.3 The Halogens in a structured sequence.<\/p>\n      <\/div>\n      <div class=\"ols-ocr313-cards-grid\">\n\n        <!-- Card 1: Trends in the Halogens -->\n        <a class=\"ols-ocr313-card ols-ocr313-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/trends-in-the-halogens\/\">\n          <div class=\"ols-ocr313-card-img-wrap\">\n            <div class=\"ols-ocr313-visual ols-ocr313-visual--ht\">\n              <div class=\"ols-ocr313-visual-panel\">\n                <div class=\"ols-ocr313-visual-kicker\">F\u2082 to I\u2082<\/div>\n                <div class=\"ols-ocr313-visual-main\">Halogen<br>Trends<\/div>\n                <div class=\"ols-ocr313-config-line\" aria-hidden=\"true\"><span>colour, volatility, electronegativity<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-ocr313-card-num\">1<\/div>\n            <span class=\"ols-ocr313-card-status ols-ocr313-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-ocr313-card-body\">\n            <p class=\"ols-ocr313-card-title\">Trends in the Halogens<\/p>\n            <p class=\"ols-ocr313-card-desc\">The trends in Group 17: states, colours, boiling points, electronegativity, reactivity and predictions for fluorine and astatine.<\/p>\n            <span class=\"ols-ocr313-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 2: Halogens as Oxidising Agents -->\n        <a class=\"ols-ocr313-card ols-ocr313-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/halogens-as-oxidising-agents\/\">\n          <div class=\"ols-ocr313-card-img-wrap\">\n            <div class=\"ols-ocr313-visual ols-ocr313-visual--ho\">\n              <div class=\"ols-ocr313-visual-panel\">\n                <div class=\"ols-ocr313-visual-kicker\">Displacement<\/div>\n                <div class=\"ols-ocr313-visual-main\">Oxidising<br>Agents<\/div>\n                <div class=\"ols-ocr313-config-line\" aria-hidden=\"true\"><span>Cl\u2082 > Br\u2082 > I\u2082<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-ocr313-card-num\">2<\/div>\n            <span class=\"ols-ocr313-card-status ols-ocr313-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-ocr313-card-body\">\n            <p class=\"ols-ocr313-card-title\">Halogens as Oxidising Agents<\/p>\n            <p class=\"ols-ocr313-card-desc\">The halogens as oxidising agents: displacement reactions, colours in water and cyclohexane, reactions with metals and hydrogen, and the reactivity trend.<\/p>\n            <span class=\"ols-ocr313-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 3: Disproportionation Reactions of Chlorine -->\n        <a class=\"ols-ocr313-card ols-ocr313-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/disproportionation-reactions-of-chlorine\/\">\n          <div class=\"ols-ocr313-card-img-wrap\">\n            <div class=\"ols-ocr313-visual ols-ocr313-visual--cd\">\n              <div class=\"ols-ocr313-visual-panel\">\n                <div class=\"ols-ocr313-visual-kicker\">Water and bleach<\/div>\n                <div class=\"ols-ocr313-visual-main\">Chlorine<br>Reactions<\/div>\n                <div class=\"ols-ocr313-config-line\" aria-hidden=\"true\"><span>Cl\u2082 + H\u2082O, Cl\u2082 + NaOH<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-ocr313-card-num\">3<\/div>\n            <span class=\"ols-ocr313-card-status ols-ocr313-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-ocr313-card-body\">\n            <p class=\"ols-ocr313-card-title\">Disproportionation Reactions of Chlorine<\/p>\n            <p class=\"ols-ocr313-card-desc\">The disproportionation of chlorine with water and with cold and hot alkali, bleach, water treatment and analogous halogen reactions.<\/p>\n            <span class=\"ols-ocr313-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 4: Halide Ions: Reducing Agents and Tests -->\n        <a class=\"ols-ocr313-card ols-ocr313-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/halide-ions-reducing-agents-and-tests\/\">\n          <div class=\"ols-ocr313-card-img-wrap\">\n            <div class=\"ols-ocr313-visual ols-ocr313-visual--hi\">\n              <div class=\"ols-ocr313-visual-panel\">\n                <div class=\"ols-ocr313-visual-kicker\">Cl\u207b, Br\u207b, I\u207b<\/div>\n                <div class=\"ols-ocr313-visual-main\">Halide<br>Ions<\/div>\n                <div class=\"ols-ocr313-config-line\" aria-hidden=\"true\"><span>H\u2082SO\u2084, AgNO\u2083, NH\u2083<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-ocr313-card-num\">4<\/div>\n            <span class=\"ols-ocr313-card-status ols-ocr313-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-ocr313-card-body\">\n            <p class=\"ols-ocr313-card-title\">Halide Ions: Reducing Agents and Tests<\/p>\n            <p class=\"ols-ocr313-card-desc\">Halide ions: reducing power with concentrated sulfuric acid, the acidified silver nitrate test and ammonia, and the hydrogen halides with ammonia and water.<\/p>\n            <span class=\"ols-ocr313-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- SPECIFICATION -->\n  <section class=\"ols-ocr313-spec-section\">\n    <div class=\"ols-ocr313-container\">\n      <div class=\"ols-ocr313-spec-wrap\">\n        <div class=\"ols-ocr313-spec-pill\">Specification Coverage<\/div>\n        <h2 class=\"ols-ocr313-spec-heading\">3.1.3 The Halogens &#8211; OCR A Level Chemistry A<\/h2>\n        <p class=\"ols-ocr313-spec-intro-text\">The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.<\/p>\n        <h3 class=\"ols-ocr313-spec-group-title\">3.1.3 The halogens<\/h3>\n        <div class=\"ols-ocr313-spec-rows\">\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--light\"><div class=\"ols-ocr313-spec-code\">3.1.3(a)<\/div><div class=\"ols-ocr313-spec-text\">existence of halogens as diatomic molecules and explanation of the trend in the boiling points of Cl\u2082, Br\u2082 and I\u2082 in terms of induced dipole\u2013dipole interactions (London forces)<\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--mid\"><div class=\"ols-ocr313-spec-code ols-ocr313-spec-code--mid\">3.1.3(b)<\/div><div class=\"ols-ocr313-spec-text\">the outer shell s\u00b2p\u2075 electron configuration and the gaining of one electron in many redox reactions to form 1\u2212 ions<\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--light\"><div class=\"ols-ocr313-spec-code\">3.1.3(c)<\/div><div class=\"ols-ocr313-spec-text\">the trend in reactivity of the halogens Cl\u2082, Br\u2082 and I\u2082, illustrated by reaction with other halide ions<\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--mid\"><div class=\"ols-ocr313-spec-code ols-ocr313-spec-code--mid\">3.1.3(d)<\/div><div class=\"ols-ocr313-spec-text\">explanation of the trend in reactivity from the decreasing ease of forming 1\u2212 ions, in terms of attraction, atomic radius and electron shielding<\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--light\"><div class=\"ols-ocr313-spec-code\">3.1.3(e)<\/div><div class=\"ols-ocr313-spec-text\">explanation of the term disproportionation as oxidation and reduction of the same element, illustrated by:<div class=\"ols-ocr313-spec-sub-list\"><div class=\"ols-ocr313-spec-sub-row\"><div class=\"ols-ocr313-spec-sub-code\">i<\/div><div class=\"ols-ocr313-spec-sub-text\">the reaction of chlorine with water as used in water treatment<\/div><\/div><div class=\"ols-ocr313-spec-sub-row\"><div class=\"ols-ocr313-spec-sub-code\">ii<\/div><div class=\"ols-ocr313-spec-sub-text\">the reaction of chlorine with cold, dilute aqueous sodium hydroxide, as used to form bleach<\/div><\/div><div class=\"ols-ocr313-spec-sub-row\"><div class=\"ols-ocr313-spec-sub-code\">iii<\/div><div class=\"ols-ocr313-spec-sub-text\">reactions analogous to those specified in (i) and (ii)<\/div><\/div><\/div><\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--mid\"><div class=\"ols-ocr313-spec-code ols-ocr313-spec-code--mid\">3.1.3(f)<\/div><div class=\"ols-ocr313-spec-text\">the benefits of chlorine use in water treatment (killing bacteria) contrasted with associated risks (hazards of toxic chlorine gas and possible risks from formation of chlorinated hydrocarbons)<\/div><\/div>\n          <div class=\"ols-ocr313-spec-row ols-ocr313-spec-row--light\"><div class=\"ols-ocr313-spec-code\">3.1.3(g)<\/div><div class=\"ols-ocr313-spec-text\">the precipitation reactions, including ionic equations, of the aqueous anions Cl\u207b, Br\u207b and I\u207b with aqueous silver ions, followed by aqueous ammonia, and their use as a test for different halide ions<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n  <script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"CollectionPage\",\n      \"@id\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/#webpage\",\n      \"url\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/ocr-a\/3-1-3-the-halogens\/\",\n      \"name\": \"3.1.3 The Halogens | OCR A A Level Chemistry | Online Learning System\",\n      \"description\": \"OCR A A Level Chemistry 3.1.3 The Halogens revision notes: trends in the halogens, halogens as 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