{"id":10532,"date":"2026-09-26T11:33:31","date_gmt":"2026-09-26T10:33:31","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/"},"modified":"2026-09-26T11:33:31","modified_gmt":"2026-09-26T10:33:31","slug":"3-2-3-group-7-17-the-halogens","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/","title":{"rendered":"3.2.3 Group 7 (17), the Halogens"},"content":{"rendered":"\n<div class=\"ols-aqa323-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>3.2.3 Group 7 (17)<\/h4>\n\n    <ul class=\"ols-topic-list\">\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/\">3.2.3 Overview<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-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\/aqa\/3-2-3-group-7-17-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\/aqa\/3-2-3-group-7-17-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\/aqa\/3-2-3-group-7-17-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\/aqa\/3-1-7-oxidation-reduction-and-redox-equations\/\">3.1.7 Oxidation, Reduction and Redox Equations<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/\">3.2.2 Group 2<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-2-amount-of-substance\/\">3.1.2 Amount of Substance<\/a>\n      <\/li>\n      <li>\n        <a 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rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #fdf4ff 0%, #d8b4fe 45%, #7e22ce 100%); }\n  <\/style>\n\n  <!-- BREADCRUMB BAR -->\n  <div class=\"ols-aqa323-breadcrumb-bar\">\n    <div class=\"ols-aqa323-container\">\n      <nav class=\"ols-aqa323-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\/aqa\/\">AQA<\/a> \/\n          <span>3.2.3 Group 7 (17)<\/span>\n        <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- INTRO -->\n  <section class=\"ols-aqa323-intro\">\n    <div class=\"ols-aqa323-container\">\n      <div class=\"ols-aqa323-intro-inner\">\n        <div>\n          <div class=\"ols-aqa323-eyebrow\">AQA A Level Chemistry<\/div>\n          <h1>3.2.3<br>Group 7 (17)<\/h1>\n          <div class=\"ols-aqa323-accent-bar\"><\/div>\n          <p class=\"ols-aqa323-intro-lead\">Section 3.2.3 covers the trends in electronegativity and boiling point of the halogens, their oxidising ability shown by displacement reactions, the reducing ability of the halide ions shown by their reactions with concentrated sulfuric acid, the acidified silver nitrate test and the ammonia follow-up, and the reactions of chlorine with water and with cold dilute sodium hydroxide, including the use of chlorine in water treatment.<\/p>\n        <\/div>\n        <div class=\"ols-aqa323-info-grid\">\n          <div class=\"ols-aqa323-info-card\"><div class=\"ols-aqa323-info-card-label\">Exam Paper<\/div><div class=\"ols-aqa323-info-card-value\">Paper 1 &amp; 3<\/div><div class=\"ols-aqa323-info-card-sub\">7405\/1 and 7405\/3<\/div><\/div>\n          <div class=\"ols-aqa323-info-card\"><div class=\"ols-aqa323-info-card-label\">Specification Points<\/div><div class=\"ols-aqa323-info-card-value\">3.2.3.1 &#8211; 3.2.3.2<\/div><div class=\"ols-aqa323-info-card-sub\">12 statements<\/div><\/div>\n          <div class=\"ols-aqa323-info-card\"><div class=\"ols-aqa323-info-card-label\">Topic Parts<\/div><div class=\"ols-aqa323-info-card-value\">4 pages<\/div><div class=\"ols-aqa323-info-card-sub\">Revision notes available<\/div><\/div>\n          <div class=\"ols-aqa323-info-card\"><div class=\"ols-aqa323-info-card-label\">Exam Board<\/div><div class=\"ols-aqa323-info-card-value\">AQA<\/div><div class=\"ols-aqa323-info-card-sub\">7405 (2015 onwards)<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- TOPIC CARDS -->\n  <section class=\"ols-aqa323-topics\">\n    <div class=\"ols-aqa323-container\">\n      <div class=\"ols-aqa323-section-header\">\n        <h2 class=\"ols-aqa323-section-title\">Revision Notes<\/h2>\n        <p class=\"ols-aqa323-section-sub\">Work through 3.2.3 Group 7 (17) in a structured sequence.<\/p>\n      <\/div>\n      <div class=\"ols-aqa323-cards-grid\">\n\n        <!-- Card 1: Trends in the Halogens -->\n        <a class=\"ols-aqa323-card ols-aqa323-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/trends-in-the-halogens\/\">\n          <div class=\"ols-aqa323-card-img-wrap\">\n            <div class=\"ols-aqa323-visual ols-aqa323-visual--ht\">\n              <div class=\"ols-aqa323-visual-panel\">\n                <div class=\"ols-aqa323-visual-kicker\">F\u2082 to I\u2082<\/div>\n                <div class=\"ols-aqa323-visual-main\">Halogen<br>Trends<\/div>\n                <div class=\"ols-aqa323-config-line\" aria-hidden=\"true\"><span>colour, volatility, electronegativity<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa323-card-num\">1<\/div>\n            <span class=\"ols-aqa323-card-status ols-aqa323-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa323-card-body\">\n            <p class=\"ols-aqa323-card-title\">Trends in the Halogens<\/p>\n            <p class=\"ols-aqa323-card-desc\">The trends in Group 7 (17): states, colours, boiling points, electronegativity, reactivity and predictions for fluorine and astatine.<\/p>\n            <span class=\"ols-aqa323-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-aqa323-card ols-aqa323-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/halogens-as-oxidising-agents\/\">\n          <div class=\"ols-aqa323-card-img-wrap\">\n            <div class=\"ols-aqa323-visual ols-aqa323-visual--ho\">\n              <div class=\"ols-aqa323-visual-panel\">\n                <div class=\"ols-aqa323-visual-kicker\">Displacement<\/div>\n                <div class=\"ols-aqa323-visual-main\">Oxidising<br>Agents<\/div>\n                <div class=\"ols-aqa323-config-line\" aria-hidden=\"true\"><span>Cl\u2082 > Br\u2082 > I\u2082<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa323-card-num\">2<\/div>\n            <span class=\"ols-aqa323-card-status ols-aqa323-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa323-card-body\">\n            <p class=\"ols-aqa323-card-title\">Halogens as Oxidising Agents<\/p>\n            <p class=\"ols-aqa323-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-aqa323-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-aqa323-card ols-aqa323-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/disproportionation-reactions-of-chlorine\/\">\n          <div class=\"ols-aqa323-card-img-wrap\">\n            <div class=\"ols-aqa323-visual ols-aqa323-visual--cd\">\n              <div class=\"ols-aqa323-visual-panel\">\n                <div class=\"ols-aqa323-visual-kicker\">Water and bleach<\/div>\n                <div class=\"ols-aqa323-visual-main\">Chlorine<br>Reactions<\/div>\n                <div class=\"ols-aqa323-config-line\" aria-hidden=\"true\"><span>Cl\u2082 + H\u2082O, Cl\u2082 + NaOH<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa323-card-num\">3<\/div>\n            <span class=\"ols-aqa323-card-status ols-aqa323-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa323-card-body\">\n            <p class=\"ols-aqa323-card-title\">Disproportionation Reactions of Chlorine<\/p>\n            <p class=\"ols-aqa323-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-aqa323-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-aqa323-card ols-aqa323-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-3-group-7-17-the-halogens\/halide-ions-reducing-agents-and-tests\/\">\n          <div class=\"ols-aqa323-card-img-wrap\">\n            <div class=\"ols-aqa323-visual ols-aqa323-visual--hi\">\n              <div class=\"ols-aqa323-visual-panel\">\n                <div class=\"ols-aqa323-visual-kicker\">Cl\u207b, Br\u207b, I\u207b<\/div>\n                <div class=\"ols-aqa323-visual-main\">Halide<br>Ions<\/div>\n                <div class=\"ols-aqa323-config-line\" aria-hidden=\"true\"><span>H\u2082SO\u2084, AgNO\u2083, NH\u2083<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa323-card-num\">4<\/div>\n            <span class=\"ols-aqa323-card-status ols-aqa323-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa323-card-body\">\n            <p class=\"ols-aqa323-card-title\">Halide Ions: Reducing Agents and Tests<\/p>\n            <p class=\"ols-aqa323-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-aqa323-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-aqa323-spec-section\">\n    <div class=\"ols-aqa323-container\">\n      <div class=\"ols-aqa323-spec-wrap\">\n        <div class=\"ols-aqa323-spec-pill\">Specification Coverage<\/div>\n        <h2 class=\"ols-aqa323-spec-heading\">3.2.3 Group 7 (17), the Halogens &#8211; AQA A Level Chemistry<\/h2>\n        <p class=\"ols-aqa323-spec-intro-text\">The following AQA specification points outline the knowledge and skills students are expected to demonstrate. Wording follows the AQA A Level Chemistry (7405) specification.<\/p>\n        <h3 class=\"ols-aqa323-spec-group-title\">3.2.3.1 Trends in properties<\/h3>\n        <div class=\"ols-aqa323-spec-rows\">\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">i<\/div><div class=\"ols-aqa323-spec-text\">The trend in electronegativity of the halogens down the group, and its explanation.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">ii<\/div><div class=\"ols-aqa323-spec-text\">The trend in boiling point of the halogens, explained in terms of their structure and bonding.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">iii<\/div><div class=\"ols-aqa323-spec-text\">The trend in oxidising ability of the halogens down the group, including displacement reactions of halide ions in aqueous solution.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">iv<\/div><div class=\"ols-aqa323-spec-text\">The trend in reducing ability of the halide ions, including the reactions of solid sodium halides with concentrated sulfuric acid.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">v<\/div><div class=\"ols-aqa323-spec-text\">The use of acidified silver nitrate solution to identify and distinguish between halide ions.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">vi<\/div><div class=\"ols-aqa323-spec-text\">The trend in solubility of the silver halides in ammonia.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">vii<\/div><div class=\"ols-aqa323-spec-text\">Explain why silver nitrate solution is used to identify halide ions, why it is acidified and why ammonia solution is added.<\/div><\/div>\n        <\/div>\n\n        <h3 class=\"ols-aqa323-spec-group-title\">3.2.3.2 Uses of chlorine and chlorate(I)<\/h3>\n        <div class=\"ols-aqa323-spec-rows\">\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">i<\/div><div class=\"ols-aqa323-spec-text\">The reaction of chlorine with water to form chloride ions and chlorate(I) ions.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">ii<\/div><div class=\"ols-aqa323-spec-text\">The reaction of chlorine with water to form chloride ions and oxygen.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">iii<\/div><div class=\"ols-aqa323-spec-text\">The use of chlorine in water treatment; the benefits to health outweigh its toxic effects.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--light\"><div class=\"ols-aqa323-spec-code\">iv<\/div><div class=\"ols-aqa323-spec-text\">Society assesses the advantages and disadvantages when deciding if chemicals should be added to water supplies.<\/div><\/div>\n          <div class=\"ols-aqa323-spec-row ols-aqa323-spec-row--mid\"><div class=\"ols-aqa323-spec-code ols-aqa323-spec-code--mid\">v<\/div><div class=\"ols-aqa323-spec-text\">The reaction of chlorine with cold, dilute, aqueous NaOH and the uses of the solution formed.<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"CollectionPage\",\n      \"@id\": 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