{"id":7150,"date":"2026-09-08T17:56:37","date_gmt":"2026-09-08T16:56:37","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/?page_id=7150"},"modified":"2026-09-08T19:06:03","modified_gmt":"2026-09-08T18:06:03","slug":"cie","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/cie\/","title":{"rendered":"Cambridge International (CIE)"},"content":{"rendered":"\n<div class=\"ols-cie-page\">\n\n  <style>\n    @import url('https:\/\/fonts.googleapis.com\/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');\n\n    .ols-cie-page,\n    .ols-cie-page * { box-sizing: border-box; }\n\n    .ols-cie-page {\n      --ols-purple: #7c2d12;\n      --ols-purple-2: #9a3412;\n      --ols-accent: #f97316;\n      --ols-accent-2: #7c2d12;\n      --ols-soft-purple: #fff7ed;\n      --ols-soft-purple-2: #ffedd5;\n      --ols-ink: #431407;\n      --ols-muted: #6b5a52;\n      --ols-soft: #fbf7f2;\n      --ols-soft-2: #fff7ed;\n      --ols-white: #ffffff;\n      --ols-border: rgba(59, 7, 100, 0.13);\n      --ols-shadow: 0 18px 45px rgba(59, 7, 100, 0.13);\n      --ols-shadow-soft: 0 10px 28px rgba(59, 7, 100, 0.09);\n      --ols-radius: 26px;\n      --ols-container: 1180px;\n\n      font-family: \"Poppins\", Arial, sans-serif;\n      color: var(--ols-ink);\n      background:\n        radial-gradient(circle at top left, rgba(249, 115, 22, 0.09), transparent 32%),\n        linear-gradient(180deg, #ffffff 0%, #ffffff 100%);\n      overflow: hidden;\n    }\n\n    .ols-cie-page a { color: inherit; text-decoration: none; }\n    .ols-cie-page img { max-width: 100%; display: block; }\n    .ols-cie-container { width: min(var(--ols-container), calc(100% - 40px)); margin: 0 auto; }\n\n    .ols-cie-btn,\n    .ols-cie-resource-link {\n      display: inline-flex;\n      align-items: center;\n      justify-content: center;\n      min-width: 116px;\n      min-height: 40px;\n      border-radius: 999px;\n      border: 1px solid rgba(59, 7, 100, 0.22);\n      color: var(--ols-purple);\n      background: #ffffff;\n      font-size: 13px;\n      font-weight: 600;\n      line-height: 1;\n      font-family: \"Poppins\", Arial, sans-serif;\n      box-shadow: none;\n      cursor: pointer;\n      white-space: nowrap;\n      padding: 13px 26px;\n      transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;\n    }\n\n    .ols-cie-btn:hover,\n    .ols-cie-resource-link:hover {\n      background: var(--ols-purple);\n      color: #ffffff;\n      border-color: var(--ols-purple);\n      transform: translateY(-2px);\n      box-shadow: none;\n    }\n\n    .ols-cie-breadcrumb-bar { padding: 16px 0 0; background: #ffffff; }\n    .ols-cie-breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--ols-muted); font-weight: 500; }\n    .ols-cie-breadcrumb a { color: var(--ols-muted); transition: color 0.2s ease; text-decoration: none; }\n    .ols-cie-breadcrumb a:hover { color: var(--ols-accent); }\n    .ols-cie-breadcrumb span { color: var(--ols-purple); font-weight: 700; }\n\n    .ols-cie-navigator {\n      padding: 72px 0 80px;\n      background:\n        radial-gradient(circle at top center, rgba(249, 115, 22, 0.08), transparent 40%),\n        linear-gradient(180deg, #fbf7f2 0%, #ffffff 100%);\n    }\n\n    .ols-cie-nav-intro { text-align: center; margin-bottom: 48px; }\n    .ols-cie-nav-eyebrow {\n      display: inline-flex;\n      align-items: center;\n      gap: 9px;\n      padding: 8px 16px;\n      border-radius: 999px;\n      background: #ffffff;\n      border: 1px solid rgba(249, 115, 22, 0.22);\n      color: var(--ols-accent);\n      font-size: 13px;\n      font-weight: 600;\n      box-shadow: 0 6px 18px rgba(59, 7, 100, 0.06);\n      margin-bottom: 18px;\n    }\n    .ols-cie-nav-eyebrow::before {\n      content: \"\";\n      width: 7px;\n      height: 7px;\n      border-radius: 50%;\n      background: var(--ols-accent);\n      box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.14);\n    }\n    .ols-cie-nav-heading {\n      font-size: clamp(32px, 4vw, 52px);\n      font-weight: 800;\n      color: var(--ols-purple);\n      letter-spacing: -0.04em;\n      line-height: 1.1;\n      margin: 0 0 14px;\n      text-shadow: -9px 0 9px rgba(59, 7, 100, 0.08);\n    }\n    .ols-cie-nav-sub { font-size: 16px; font-weight: 300; color: var(--ols-muted); margin: 0; }\n\n    .ols-cie-unit-row { display: grid; grid-template-columns: 152px 1fr; gap: 16px; margin-bottom: 14px; align-items: stretch; }\n    .ols-cie-unit-label {\n      border-radius: 22px;\n      padding: 18px 14px;\n      display: flex;\n      flex-direction: column;\n      justify-content: center;\n      align-items: center;\n      text-align: center;\n      font-weight: 800;\n      font-size: 11px;\n      letter-spacing: 0.05em;\n      text-transform: uppercase;\n      line-height: 1.4;\n      gap: 3px;\n      min-height: 80px;\n      border: 1px solid;\n    }\n    .ols-cie-unit-label span { font-size: 21px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; }\n    .ols-cie-unit-label small { font-size: 10px; font-weight: 500; opacity: 0.70; }\n    a.ols-cie-unit-label { cursor: pointer; text-decoration: none; transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease; }\n    a.ols-cie-unit-label:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(59, 7, 100, 0.10); }\n\n    .ols-nav-physical { background: #fff7ed; border-color: rgba(88, 28, 135, 0.22); color: #7c2d12; }\n    .ols-nav-inorganic { background: #fff7ed; border-color: rgba(124, 45, 18, 0.22); color: #7c2d12; }\n    .ols-nav-organic { background: #fdf2f8; border-color: rgba(157, 23, 77, 0.18); color: #831843; }\n    .ols-nav-practical { background: #f8fafc; border-color: rgba(51, 65, 85, 0.20); color: #334155; }\n\n    .ols-cie-topics-wrap { display: flex; flex-wrap: wrap; gap: 10px; align-content: flex-start; }\n    .ols-cie-topic-chip {\n      display: inline-flex;\n      flex-direction: column;\n      gap: 3px;\n      padding: 12px 14px;\n      border-radius: 16px;\n      background: #ffffff;\n      border: 1px solid;\n      font-size: 11px;\n      font-weight: 700;\n      color: var(--ols-purple);\n      letter-spacing: 0.01em;\n      text-decoration: none;\n      min-width: 122px;\n      max-width: 190px;\n      transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;\n    }\n    .ols-cie-topic-chip.ols-chip-physical { border-color: rgba(88, 28, 135, 0.18); }\n    .ols-cie-topic-chip.ols-chip-physical .ols-chip-num { color: #ea580c; }\n    .ols-cie-topic-chip.ols-chip-inorganic { border-color: rgba(124, 45, 18, 0.18); }\n    .ols-cie-topic-chip.ols-chip-inorganic .ols-chip-num { color: #c2410c; }\n    .ols-cie-topic-chip.ols-chip-organic { border-color: rgba(157, 23, 77, 0.18); }\n    .ols-cie-topic-chip.ols-chip-organic .ols-chip-num { color: #be185d; }\n    .ols-cie-topic-chip.ols-chip-practical { border-color: rgba(51, 65, 85, 0.18); }\n    .ols-cie-topic-chip.ols-chip-practical .ols-chip-num { color: #475569; }\n    .ols-cie-topic-chip.ols-chip-available:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(59, 7, 100, 0.10); }\n    .ols-cie-topic-chip.ols-chip-locked { opacity: 0.68; cursor: default; pointer-events: none; }\n    .ols-chip-num { font-size: 10px; font-weight: 600; }\n    .ols-chip-name { font-size: 12px; font-weight: 700; line-height: 1.3; }\n    .ols-chip-pill { display: inline-flex; align-items: center; padding: 3px 8px; border-radius: 999px; font-size: 10px; font-weight: 700; width: fit-content; margin-top: 4px; }\n    .ols-pill-available { background: #eaf3de; color: #3B6D11; }\n    .ols-pill-soon { background: #f0f2f8; color: #4b5575; }\n    .ols-pill-paper { background: #fff7ed; color: #9a3412; border: 1px solid rgba(88, 28, 135, 0.12); }\n    .ols-cie-nav-legend { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; margin-top: 32px; font-size: 12px; color: var(--ols-muted); font-weight: 500; }\n    .ols-cie-nav-legend-item { display: flex; align-items: center; gap: 7px; }\n    .ols-cie-nav-legend-dot { width: 12px; height: 12px; border-radius: 3px; flex-shrink: 0; }\n    .ols-legend-available { background: #3B6D11; }\n    .ols-legend-soon { background: #d0d5e8; border: 1px solid rgba(28,36,75,0.15); }\n\n    .ols-cie-hero { padding: 74px 0 80px; }\n    .ols-cie-hero-grid { display: grid; grid-template-columns: 0.92fr 1.08fr; gap: 72px; align-items: center; }\n    .ols-cie-eyebrow {\n      display: inline-flex;\n      align-items: center;\n      gap: 10px;\n      padding: 9px 14px;\n      border-radius: 999px;\n      background: #ffffff;\n      border: 1px solid rgba(249, 115, 22, 0.18);\n      color: var(--ols-accent);\n      font-size: 13px;\n      font-weight: 600;\n      box-shadow: 0 8px 20px rgba(59, 7, 100, 0.06);\n      margin-bottom: 22px;\n    }\n    .ols-cie-eyebrow::before { content: \"\"; width: 8px; height: 8px; border-radius: 50%; background: var(--ols-accent); box-shadow: 0 0 0 5px rgba(249, 115, 22, 0.10); }\n    .ols-cie-hero h1,\n    .ols-cie-section-title { color: var(--ols-purple); font-weight: 700; letter-spacing: -0.045em; line-height: 1.08; margin: 0; text-shadow: -9px 0 9px rgba(59, 7, 100, 0.08); }\n    .ols-cie-hero h1 { font-size: clamp(52px, 6vw, 86px); max-width: 560px; }\n    .ols-cie-hero-lead { color: #6b2a0f; font-size: clamp(18px, 2vw, 22px); line-height: 1.62; font-weight: 300; margin: 26px 0 0; max-width: 560px; }\n    .ols-cie-hero-actions { display: flex; justify-content: center; margin-top: 34px; }\n\n    .ols-cie-info-panel {\n      position: relative;\n      background:\n        linear-gradient(145deg, rgba(255,255,255,0.92), rgba(251,247,242,0.94)),\n        radial-gradient(circle at top right, rgba(249, 115, 22, 0.12), transparent 38%);\n      border: 1px solid var(--ols-border);\n      border-radius: var(--ols-radius);\n      box-shadow: var(--ols-shadow);\n      padding: 44px 44px 40px;\n      overflow: hidden;\n    }\n    .ols-cie-info-panel::before {\n      content: \"\";\n      position: absolute;\n      inset: 0;\n      pointer-events: none;\n      background: linear-gradient(90deg, rgba(249, 115, 22, 0.08) 1px, transparent 1px), linear-gradient(180deg, rgba(249, 115, 22, 0.08) 1px, transparent 1px);\n      background-size: 34px 34px;\n      mask-image: linear-gradient(135deg, rgba(0,0,0,0.32), transparent 70%);\n    }\n    .ols-cie-info-item { position: relative; padding: 0 0 34px 0; margin-bottom: 34px; border-bottom: 1px solid rgba(59, 7, 100, 0.10); }\n    .ols-cie-info-item:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }\n    .ols-cie-info-item h2 { margin: 0 0 8px; color: var(--ols-purple); font-size: 20px; line-height: 1.18; letter-spacing: -0.02em; font-weight: 700; }\n    .ols-cie-info-item p { margin: 0; color: #6b2a0f; font-size: 14px; line-height: 1.72; font-weight: 400; }\n\n    .ols-cie-papers { padding: 84px 0 96px; background: linear-gradient(180deg, rgba(251,247,242,0.76), rgba(255,255,255,1)); }\n    .ols-cie-papers-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 70px; align-items: start; }\n    .ols-cie-paper-panel {\n      background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(251,247,242,0.96));\n      border: 1px solid var(--ols-border);\n      border-radius: var(--ols-radius);\n      box-shadow: var(--ols-shadow-soft);\n      padding: 42px;\n      position: relative;\n      overflow: hidden;\n    }\n    .ols-cie-paper-panel::before { content: \"\"; position: absolute; width: 210px; height: 210px; border-radius: 50%; background: rgba(249, 115, 22, 0.12); right: -82px; top: -82px; }\n    .ols-cie-paper-item { position: relative; padding-bottom: 34px; margin-bottom: 34px; border-bottom: 1px solid rgba(59, 7, 100, 0.10); }\n    .ols-cie-paper-item:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }\n    .ols-cie-paper-item h3 { margin: 0 0 12px; color: var(--ols-purple); font-size: 18px; line-height: 1.25; letter-spacing: -0.02em; font-weight: 700; }\n    .ols-cie-paper-meta { margin: 0 0 14px; color: #9a3412; font-size: 13px; line-height: 1.7; font-weight: 500; }\n    .ols-cie-paper-item p { color: #6b2a0f; font-size: 13px; line-height: 1.72; margin: 0 0 14px; padding: 0; }\n    .ols-cie-papers-copy { position: sticky; top: 24px; }\n    .ols-cie-papers-copy h2 { font-size: clamp(42px, 5vw, 64px); max-width: 560px; }\n    .ols-cie-papers-copy p { color: #9a3412; font-size: 17px; line-height: 1.65; font-weight: 300; margin: 24px 0 34px; max-width: 560px; }\n\n    .ols-cie-mini-products { display: grid; grid-template-columns: 1fr; gap: 22px; max-width: 310px; margin: 0 auto; }\n    .ols-cie-course-card { display: block; background: #ffffff; border: 1px solid rgba(59, 7, 100, 0.12); border-radius: 20px; overflow: hidden; box-shadow: 0 14px 30px rgba(59, 7, 100, 0.12); transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease; }\n    .ols-cie-course-card:hover { transform: translateY(-10px); box-shadow: 0 24px 46px rgba(59, 7, 100, 0.18); border-color: rgba(249, 115, 22, 0.30); }\n    .ols-cie-course-placeholder { aspect-ratio: 1 \/ 1; background: linear-gradient(135deg, #07111f 0%, #7c2d12 52%, #7c2d12 100%); display: flex; align-items: center; justify-content: center; color: #ffffff; text-align: center; padding: 28px; font-weight: 800; font-size: 28px; line-height: 1.1; }\n    .ols-cie-course-body { padding: 18px 18px 22px; text-align: center; }\n    .ols-cie-course-body h3 { margin: 0 0 8px; color: #ea580c; font-size: 14px; line-height: 1.35; font-weight: 500; }\n    .ols-cie-stars { color: #e2336b; font-size: 15px; line-height: 1; margin-bottom: 7px; letter-spacing: 1px; }\n    .ols-cie-price { font-size: 13px; color: var(--ols-purple); font-weight: 700; }\n    .ols-cie-price del { opacity: 0.55; margin-right: 6px; font-weight: 500; }\n    .ols-cie-basket { display: inline-flex; margin-top: 14px; padding: 9px 16px; border-radius: 8px; background: #fff7ed; color: var(--ols-purple); font-size: 12px; font-weight: 600; }\n    .ols-cie-product-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; margin-top: 58px; }\n    .ols-cie-product-row .ols-cie-course-card { max-width: 360px; width: 100%; margin: 0 auto; }\n\n    .ols-cie-pathway { padding: 86px 0 60px; background: #ffffff; }\n    .ols-cie-pathway-card { border-radius: 28px; border: 1px solid rgba(59, 7, 100, 0.12); box-shadow: var(--ols-shadow-soft); padding: 34px; background: #ffffff; overflow: hidden; }\n    .ols-cie-pathway-card h2 { color: var(--ols-purple); font-size: clamp(34px, 4vw, 52px); line-height: 1.1; letter-spacing: -0.04em; margin: 0 0 16px; font-weight: 700; text-shadow: -9px 0 9px rgba(59, 7, 100, 0.08); }\n    .ols-cie-pathway-card p { color: #9a3412; font-size: 16px; line-height: 1.7; margin: 0 0 18px; max-width: 900px; }\n    .ols-cie-pathway-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 24px; }\n    .ols-cie-pathway-pill { border-radius: 18px; background: #fbf7f2; border: 1px solid rgba(59,7,100,0.10); padding: 18px; color: #6b2a0f; font-size: 13px; line-height: 1.55; font-weight: 500; }\n    .ols-cie-pathway-pill strong { display: block; color: var(--ols-purple); margin-bottom: 5px; }\n\n    .ols-cie-study { padding: 82px 0 92px; background: radial-gradient(circle at top center, rgba(249, 115, 22, 0.08), transparent 32%), linear-gradient(180deg, #fbf7f2 0%, #ffffff 100%); text-align: center; }\n    .ols-cie-study h2 { color: var(--ols-purple); font-size: clamp(40px, 5vw, 64px); line-height: 1.1; letter-spacing: -0.045em; margin: 0; font-weight: 700; text-shadow: -9px 0 9px rgba(59, 7, 100, 0.08); }\n    .ols-cie-study p { max-width: 860px; margin: 22px auto 30px; color: #9a3412; font-size: 18px; line-height: 1.65; font-weight: 300; }\n    .ols-cie-study-image { width: min(760px, 100%); margin: 38px auto 0; border-radius: 24px; overflow: hidden; box-shadow: 0 20px 42px rgba(59, 7, 100, 0.18); border: 1px solid rgba(59, 7, 100, 0.14); background: #ffedd5; }\n    .ols-cie-study-image img { width: 100%; height: auto; }\n\n    .ols-cie-choice { padding: 80px 0 50px; background: #ffffff; }\n    .ols-cie-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }\n    .ols-cie-choice-card { position: relative; background: linear-gradient(145deg, #ffffff, #fbf7f2); border: 1px solid rgba(59,7,100,0.12); border-radius: 26px; box-shadow: var(--ols-shadow-soft); padding: 34px; overflow: hidden; }\n    .ols-cie-choice-card::before { content: \"\"; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(249,115,22,0.06) 1px, transparent 1px), linear-gradient(180deg, rgba(249,115,22,0.06) 1px, transparent 1px); background-size: 36px 36px; mask-image: linear-gradient(135deg, rgba(0,0,0,0.24), transparent 70%); pointer-events: none; }\n    .ols-cie-choice-card > * { position: relative; }\n    .ols-cie-badge { display: inline-flex; align-items: center; padding: 8px 12px; border-radius: 999px; background: #ffffff; border: 1px solid rgba(249,115,22,0.18); color: var(--ols-accent); font-size: 12px; font-weight: 700; margin-bottom: 18px; }\n    .ols-cie-choice-card h2 { color: var(--ols-purple); margin: 0 0 14px; font-size: 26px; line-height: 1.2; letter-spacing: -0.035em; font-weight: 700; text-shadow: -9px 0 9px rgba(59,7,100,0.08); }\n    .ols-cie-choice-line { width: 62px; height: 3px; background: var(--ols-accent); border-radius: 999px; margin-bottom: 18px; }\n    .ols-cie-chip { display: inline-flex; padding: 8px 12px; border-radius: 8px; background: var(--ols-purple); color: #ffffff; font-size: 12px; font-weight: 700; margin-bottom: 18px; }\n    .ols-cie-choice-card p { margin: 0; color: #6b2a0f; font-size: 14px; line-height: 1.8; }\n\n    .ols-cie-video-section { padding: 88px 0 92px; background: #fbf7f2; text-align: center; }\n    .ols-cie-video-section h2 { color: var(--ols-purple); font-size: clamp(40px, 4.6vw, 58px); line-height: 1.12; letter-spacing: -0.04em; margin: 0; font-weight: 700; text-shadow: -9px 0 9px rgba(59,7,100,0.08); }\n    .ols-cie-video-section p { margin: 16px auto 34px; color: #9a3412; font-size: 18px; line-height: 1.58; font-weight: 300; max-width: 760px; }\n    .ols-cie-video-wrap { position: relative; width: min(1040px, 100%); margin: 0 auto; border-radius: 28px; overflow: hidden; background: #000000; box-shadow: 0 24px 54px rgba(59,7,100,0.22); border: 1px solid rgba(59,7,100,0.16); }\n    .ols-cie-video-frame { position: relative; width: 100%; padding-top: 56.25%; }\n    .ols-cie-video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }\n\n    .ols-cie-resources { padding: 78px 0 92px; background: #ffffff; }\n    .ols-cie-resource-stack { display: grid; gap: 24px; max-width: 880px; margin: 0 auto; }\n    .ols-cie-resource-card { background: linear-gradient(145deg, #ffffff, #fbf7f2); border: 1px solid rgba(59,7,100,0.10); border-radius: 24px; box-shadow: 0 12px 28px rgba(59,7,100,0.08); padding: 34px 28px; text-align: center; }\n    .ols-cie-resource-card h3 { margin: 0 0 12px; color: var(--ols-purple); font-size: 22px; line-height: 1.2; letter-spacing: -0.025em; font-weight: 700; }\n    .ols-cie-resource-card p { color: #6b2a0f; font-size: 14px; line-height: 1.72; margin: 0 auto 20px; max-width: 720px; }\n\n    .ols-cie-faq { padding: 86px 0 100px; background: radial-gradient(circle at top center, rgba(249,115,22,0.09), transparent 32%), linear-gradient(180deg, #ffffff 0%, #fbf7f2 100%); }\n    .ols-cie-faq h2 { text-align: center; color: var(--ols-purple); font-size: clamp(46px, 5vw, 68px); 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font-size: 15px; line-height: 1.45; font-weight: 600; white-space: normal; outline: none !important; box-shadow: none !important; -webkit-tap-highlight-color: transparent; appearance: none; -webkit-appearance: none; }\n    .ols-cie-faq-title { display: block; min-width: 0; max-width: 100%; white-space: normal; overflow: visible; text-overflow: unset; word-break: normal; overflow-wrap: break-word; padding-right: 4px; color: var(--ols-purple) !important; }\n    .ols-cie-faq-icon { width: 34px; height: 34px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; justify-self: end; background: rgba(249,115,22,0.12) !important; color: var(--ols-accent) !important; transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease; font-size: 22px; line-height: 1; font-weight: 700; }\n    .ols-cie-faq-answer { display: none; background: #ffffff; }\n    .ols-cie-faq-answer-inner { padding: 18px 24px 26px; color: #6b2a0f; font-size: 14px; line-height: 1.82; 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gap: 10px; }\n      .ols-cie-unit-label { flex-direction: row; border-radius: 14px; min-height: auto; padding: 12px 16px; justify-content: flex-start; text-align: left; gap: 10px; }\n      .ols-cie-topics-wrap { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }\n      .ols-cie-topic-chip { width: 100%; min-width: 0; max-width: none; }\n      .ols-cie-topic-chip:last-child:nth-child(odd) { grid-column: 1 \/ -1; }\n    }\n\n    @media (max-width: 460px) {\n      .ols-cie-hero h1 { font-size: 42px; }\n      .ols-cie-choice-card { padding: 28px 22px; }\n      .ols-cie-faq-question { min-height: 76px; padding: 20px; grid-template-columns: minmax(0, 1fr) 32px; gap: 14px; font-size: 14px; }\n      .ols-cie-faq-icon { width: 32px; height: 32px; }\n      .ols-cie-faq-answer-inner { padding: 16px 20px 22px; }\n    }\n  <\/style>\n\n  <!-- BREADCRUMB BAR -->\n  <div class=\"ols-cie-breadcrumb-bar\">\n    <div class=\"ols-cie-container\">\n      <nav class=\"ols-cie-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        <span>Cambridge International (CIE)<\/span>\n      <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- TOPIC NAVIGATOR -->\n  <section class=\"ols-cie-navigator\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-nav-intro\">\n        <div class=\"ols-cie-nav-eyebrow\">Cambridge International AS &amp; A Level Chemistry (9701)<\/div>\n        <h2 class=\"ols-cie-nav-heading\">Revision Notes by Syllabus Topic<\/h2>\n        <p class=\"ols-cie-nav-sub\">Select a syllabus topic to access structured Cambridge International revision notes, practical links and exam practice as pages are released. Topics 1\u201322 are AS Level; Topics 23\u201337 are A Level only.<\/p>\n      <\/div>\n      <div id=\"ols-cie-units-container\"><\/div>\n      <div class=\"ols-cie-nav-legend\">\n        \n        <div class=\"ols-cie-nav-legend-item\"><span class=\"ols-cie-nav-legend-dot ols-legend-soon\"><\/span>Coming soon<\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- HERO -->\n  <section class=\"ols-cie-hero\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-hero-grid\">\n        <div class=\"ols-cie-hero-copy\">\n          <div class=\"ols-cie-eyebrow\">Introduction<\/div>\n          <h1>Cambridge<br>International<br>Chemistry<\/h1>\n          <p class=\"ols-cie-hero-lead\">\n            Cambridge International AS &amp; A Level Chemistry (9701) is the Cambridge Assessment International Education qualification taken worldwide, with exam series in June and November (and March for India). The syllabus for 2025 to 2027 is organised into 37 numbered topics: Topics 1 to 22 form the AS Level and Topics 23 to 37 add the A Level content, each divided into physical, inorganic and organic chemistry.\n          <\/p>\n          <div class=\"ols-cie-hero-actions\">\n            <a class=\"ols-cie-btn\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/cambridge-chemistry-9701\/\">View Courses<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"ols-cie-info-panel\" aria-label=\"Cambridge International AS &amp; A Level Chemistry overview\">\n          <div class=\"ols-cie-info-item\">\n            <h2>A Linear Qualification<\/h2>\n            <p>\n              The full A Level can be taken as a linear qualification with all papers at the end of the course, or staged, with the AS papers taken first and carried forward. It uses syllabus code 9701 and the A*-E grading scale (a-e at AS Level).\n            <\/p>\n          <\/div>\n          <div class=\"ols-cie-info-item\">\n            <h2>Practical Assessment<\/h2>\n            <p>\n              There is no separate practical endorsement. Practical skills are examined directly: Paper 3 is a timed laboratory practical at AS Level, and Paper 5 assesses planning, analysis and evaluation at A Level.\n            <\/p>\n          <\/div>\n          <div class=\"ols-cie-info-item\">\n            <h2>AS Level Chemistry<\/h2>\n            <p>\n              Cambridge International AS Level Chemistry can be taken as a standalone qualification (Papers 1, 2 and 3) or as the first half of the A Level, with the AS marks carried forward to the full qualification.\n            <\/p>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- THREE PAPERS -->\n  <section class=\"ols-cie-papers\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-papers-grid\">\n        <div class=\"ols-cie-paper-panel\">\n          <div class=\"ols-cie-paper-item\">\n            <h3>Paper 1 &#8211; Multiple Choice (AS)<\/h3>\n            <div class=\"ols-cie-paper-meta\">\n              Paper code: 9701\/1<br>\n              Written examination: 1 hour 15 minutes | 40 marks | 31% of AS Level, 15.5% of A Level\n            <\/div>\n            <p>\n              Forty multiple-choice questions on the AS Level subject content, Topics 1 to 22. Questions may test any AS topic, including organic chemistry and practical understanding.\n            <\/p>\n          <\/div>\n          <div class=\"ols-cie-paper-item\">\n            <h3>Paper 2 &#8211; AS Level Structured Questions<\/h3>\n            <div class=\"ols-cie-paper-meta\">\n              Paper code: 9701\/2<br>\n              Written examination: 1 hour 15 minutes | 40 marks | 31% of AS Level, 15.5% of A Level\n            <\/div>\n            <p>\n              Structured questions on the AS Level subject content, Topics 1 to 22. 1 hour 15 minutes, 60 marks, 46% of AS Level and 23% of A Level. Paper 3 (Advanced Practical Skills, 40 marks) completes the AS assessment.\n            <\/p>\n          <\/div>\n          <div class=\"ols-cie-paper-item\">\n            <h3>Paper 4 &#8211; A Level Structured Questions<\/h3>\n            <div class=\"ols-cie-paper-meta\">\n              Paper code: 9701\/4<br>\n              Written examination: 2 hours | 100 marks | 38.5% of A Level\n            <\/div>\n            <p>\n              Structured questions on the A Level subject content, Topics 23 to 37, which may also draw on AS content. Paper 5 (Planning, Analysis and Evaluation, 30 marks, 1 hour 15 minutes) completes the A Level assessment.\n            <\/p>\n          <\/div>\n        <\/div>\n\n        <div class=\"ols-cie-papers-copy\">\n          <h2 class=\"ols-cie-section-title\">The Papers &#8211; How The AS and A Level Are Assessed<\/h2>\n          <p>\n            Cambridge International Chemistry is assessed through five papers. Papers 1, 2 and 3 cover the AS Level content, with Paper 3 a practical examination. Papers 4 and 5 cover the A Level content, with Paper 5 assessing planning, analysis and evaluation of experiments.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- PATHWAY -->\n  <section class=\"ols-cie-pathway\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-pathway-card\">\n        <h2>Cambridge Syllabus Pathway<\/h2>\n        <p>\n          Cambridge Chemistry is organised into 37 numbered topics, several of which appear twice: once at AS Level and again, extended, at A Level (for example Topic 14 Hydrocarbons and Topic 30 Hydrocarbons). OLS course cards pool related topics so that students can study coherent course units while still seeing the exact syllabus learning outcomes covered.\n        <\/p>\n        <div class=\"ols-cie-pathway-list\">\n          <div class=\"ols-cie-pathway-pill\"><strong>Physical chemistry &#8211; Topics 1\u20138 and 23\u201326<\/strong>Atomic structure, stoichiometry, bonding, states of matter, energetics, electrochemistry, equilibria and reaction kinetics.<\/div>\n          <div class=\"ols-cie-pathway-pill\"><strong>Inorganic chemistry &#8211; Topics 9\u201312 and 27\u201328<\/strong>Periodicity, Group 2, Group 17, nitrogen and sulfur, and the chemistry of transition elements.<\/div>\n          <div class=\"ols-cie-pathway-pill\"><strong>Organic chemistry &#8211; Topics 13\u201322 and 29\u201337<\/strong>Introductory organic chemistry, hydrocarbons, halogen compounds, hydroxy compounds, carbonyls, carboxylic acids, nitrogen compounds, polymerisation, synthesis and analytical techniques.<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- STUDY WITH OLS -->\n  <section class=\"ols-cie-study\">\n    <div class=\"ols-cie-container\">\n      <h2>Study Cambridge International Chemistry with OLS<\/h2>\n      <p>\n        OLS Cambridge courses are built around syllabus topics, with structured revision notes, worked examples, exam-style practice and clear links between practical skills and written exam questions.\n      <\/p>\n      <a class=\"ols-cie-btn\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/cambridge-chemistry-9701\/\">View Courses<\/a>\n      <div class=\"ols-cie-study-image\">\n        <img decoding=\"async\" src=\"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-content\/uploads\/2025\/07\/a-level-chemistry-virtual-lesson-tutor.webp\" alt=\"Cambridge International Chemistry online virtual lesson with tutor\" title=\"Study Cambridge International Chemistry with OLS\">\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- CHOICE CARDS -->\n  <section class=\"ols-cie-choice\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-choice-grid\">\n        <article class=\"ols-cie-choice-card\">\n          <span class=\"ols-cie-badge\">Full Qualification<\/span>\n          <h2>Take the A Level if&#8230;<\/h2>\n          <div class=\"ols-cie-choice-line\"><\/div>\n          <span class=\"ols-cie-chip\">Cambridge International A Level &#8211; 9701<\/span>\n          <p>\n            You need chemistry for university entry, particularly for medicine, dentistry, pharmacy, biochemistry, chemical engineering or related science degrees. The full A Level is recognised by universities worldwide, including all UK universities.\n          <\/p>\n        <\/article>\n        <article class=\"ols-cie-choice-card\">\n          <span class=\"ols-cie-badge\">Standalone Award<\/span>\n          <h2>Take the AS Level if&#8230;<\/h2>\n          <div class=\"ols-cie-choice-line\"><\/div>\n          <span class=\"ols-cie-chip\">Cambridge International AS Level &#8211; 9701<\/span>\n          <p>\n            You want a recognised one-year chemistry qualification, or you want to stage the A Level by taking the AS papers first. Unlike the UK boards, Cambridge lets AS marks carry forward into the full A Level.\n          <\/p>\n        <\/article>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- VIDEO -->\n  <section class=\"ols-cie-video-section\">\n    <div class=\"ols-cie-container\">\n      <h2>Watch a Chemistry Lesson Preview<\/h2>\n      <p>\n        See how OLS uses visual explanation, molecular models and specialist teacher commentary to support difficult A Level Chemistry topics.\n      <\/p>\n      <div class=\"ols-cie-video-wrap\">\n        <div class=\"ols-cie-video-frame\">\n          <iframe src=\"https:\/\/www.youtube.com\/embed\/M0iLMXF5o6o?start=1\" title=\"A Level Chemistry online lesson preview\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"\"><\/iframe>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- RESOURCES -->\n  <section class=\"ols-cie-resources\">\n    <div class=\"ols-cie-container\">\n      <div class=\"ols-cie-resource-stack\">\n        <article class=\"ols-cie-resource-card\">\n          <h3>Official Specification<\/h3>\n          <p>\n            The official Cambridge International AS &amp; A Level Chemistry 9701 syllabus for 2025 to 2027, covering subject content, assessment, practical skills and mathematical requirements.\n          <\/p>\n          <a class=\"ols-cie-resource-link\" href=\"INSERT_LINK_HERE\">Cambridge 9701 Syllabus \u2192<\/a>\n        <\/article>\n        <article class=\"ols-cie-resource-card\">\n          <h3>Past Papers &amp; Mark Schemes<\/h3>\n          <p>\n            The official Cambridge International past papers area, including question papers, mark schemes and examiner reports for 9701 Chemistry.\n          <\/p>\n          <a class=\"ols-cie-resource-link\" href=\"INSERT_LINK_HERE\">Cambridge Past Papers \u2192<\/a>\n        <\/article>\n        <article class=\"ols-cie-resource-card\">\n          <h3>Chemistry Reference Library<\/h3>\n          <p>\n            LibreTexts Chemistry is a free, open-access chemistry library covering a wide range of topics at A Level and beyond, useful for deeper reading and alternative explanations of difficult concepts.\n          <\/p>\n          <a class=\"ols-cie-resource-link\" href=\"INSERT_LINK_HERE\">LibreTexts Chemistry \u2192<\/a>\n        <\/article>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- FAQ -->\n  <section class=\"ols-cie-faq\">\n    <div class=\"ols-cie-container\">\n      <h2>FAQ<\/h2>\n      <div class=\"ols-cie-faq-grid\">\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">How is Cambridge International Chemistry organised?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">The syllabus is organised into 37 numbered topics, each with numbered learning outcomes such as 14.2.4 or 3.4.1(a). Topics 1 to 22 are AS Level and Topics 23 to 37 are A Level. OLS uses these syllabus references directly so students can revise by exact learning outcome.<\/div><\/div>\n        <\/div>\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">How many exams are there for Cambridge International Chemistry?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">There are five papers in total. Papers 1, 2 and 3 make up the AS Level (multiple choice, structured questions and a practical exam). Papers 4 and 5 make up the A Level half (structured questions and planning, analysis and evaluation).<\/div><\/div>\n        <\/div>\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">Does Cambridge use Edexcel-style topic numbers?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">Cambridge also numbers its topics, but differently: Topic 14 Hydrocarbons covers alkanes and alkenes at AS Level, while related content such as isomerism sits in Topic 13 and polymers in Topic 20. OLS places each page where the syllabus places the content and links across topics where a course unit draws on several.<\/div><\/div>\n        <\/div>\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">Are practical skills assessed?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">Yes, directly. Paper 3 is a timed laboratory practical at AS Level and Paper 5 assesses planning, analysis and evaluation at A Level. Practical understanding is also examined in the written papers.<\/div><\/div>\n        <\/div>\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">Does the AS Level count towards the A Level?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">Yes, if you stage the qualification. Cambridge allows the AS papers (1, 2 and 3) to be taken in one series and carried forward, with Papers 4 and 5 taken later to complete the A Level. The AS can also be taken as a standalone qualification.<\/div><\/div>\n        <\/div>\n        <div class=\"ols-cie-faq-item\">\n          <button class=\"ols-cie-faq-question\" type=\"button\"><span class=\"ols-cie-faq-title\">How much mathematics is involved?<\/span><span class=\"ols-cie-faq-icon\">+<\/span><\/button>\n          <div class=\"ols-cie-faq-answer\"><div class=\"ols-cie-faq-answer-inner\">Cambridge Chemistry includes substantial mathematical work: at least 20% of the marks require mathematics, covering moles, concentrations, energetics, equilibria, rates, logarithms, graph work and practical-data analysis. Students should be confident rearranging equations and interpreting quantitative data.<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <script>\n    (function () {\n      var BASE = \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/cie\/\";\n\n      var rows = [\n        {\n          id: \"as-physical\", labelClass: \"ols-nav-physical\", chipClass: \"ols-chip-physical\",\n          label: \"AS 1\u20138\", qual: \"PHYSICAL\", desc: \"AS Level\",\n          topics: [\n            { num: \"1\", name: \"Atomic structure\", paper: \"Papers 1 &amp; 2\", locked: true },\n            { num: \"2\", name: \"Atoms, molecules and stoichiometry\", paper: \"Papers 1 &amp; 2\", locked: true },\n            { num: \"3\", name: \"Chemical bonding\", paper: \"Papers 1 &amp; 2\", locked: true },\n            { num: \"4\", name: \"States of matter\", paper: \"Papers 1 &amp; 2\", locked: true },\n            { num: \"5\", name: \"Chemical energetics\", paper: \"Papers 1 &amp; 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