GCSE AQA Science: Last-Minute Revision Notes | GCSE AQA 科学：考前冲刺笔记

📚 GCSE AQA Science: Last-Minute Revision Notes | GCSE AQA 科学：考前冲刺笔记

Preparing for your GCSE AQA Science exams? These last-minute revision notes cover essential concepts across Biology, Chemistry, and Physics, focusing on high-yield topics for AQA Combined Science: Trilogy. Use these concise summaries to reinforce your understanding and boost your confidence before the exam.

正在准备 GCSE AQA 科学考试？这些考前冲刺笔记涵盖生物学、化学和物理学的核心概念，聚焦于AQA综合科学：三部曲中的高频考点。用这些简洁的总结来巩固理解，在考前增强信心。

1. Cell Biology & Organisation | 细胞生物学与组织

Eukaryotic cells (plant and animal) have a nucleus, cytoplasm, cell membrane, and mitochondria. Prokaryotic cells (bacteria) lack a nucleus and have a single loop of DNA.

真核细胞（植物和动物）有细胞核、细胞质、细胞膜和线粒体。原核细胞（细菌）没有细胞核，有一条环形DNA。

Specialised cells: sperm cells have a tail for movement; root hair cells have a large surface area to absorb water. Enzymes are biological catalysts that speed up reactions, with each enzyme specific to a substrate.

特化细胞：精子细胞有尾部用于运动；根毛细胞有较大的表面积以吸收水分。酶是生物催化剂，加速反应，每种酶对其底物具有特异性。

The digestive system breaks down large molecules into smaller ones. Amylase breaks down starch into glucose, proteases break down proteins into amino acids, and lipases break down lipids into fatty acids and glycerol. Bile emulsifies fats and neutralises stomach acid.

消化系统将大分子分解为小分子。淀粉酶将淀粉分解为葡萄糖，蛋白酶将蛋白质分解为氨基酸，脂肪酶将脂质分解为脂肪酸和甘油。胆汁乳化脂肪并中和胃酸。

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2. Infection and Response | 感染与反应

Pathogens include bacteria, viruses, fungi, and protists. Bacteria produce toxins; viruses replicate inside host cells. Measles and HIV are viral; Salmonella and gonorrhoea are bacterial; rose black spot is a fungal disease; malaria is caused by a protist.

病原体包括细菌、病毒、真菌和原生生物。细菌产生毒素；病毒在宿主细胞内复制。麻疹和艾滋病毒是病毒引起的；沙门氏菌病和淋病是细菌引起的；黑斑病是真菌病；疟疾由原生生物引起。

The immune system uses white blood cells to engulf pathogens, produce antibodies, and produce antitoxins. Vaccination introduces a dead or weakened pathogen, stimulating antibody production and creating memory cells for rapid future response.

免疫系统利用白细胞吞噬病原体、产生抗体和产生抗毒素。疫苗接种引入死亡或减毒的病原体，刺激产生抗体并产生记忆细胞，以便将来快速反应。

Antibiotics kill bacteria but not viruses. Painkillers relieve symptoms without killing pathogens. Developing new drugs involves preclinical testing and clinical trials with placebos and blind conditions.

抗生素能杀死细菌但不能杀死病毒。止痛药缓解症状但不杀死病原体。新药开发包括临床前测试和使用安慰剂及盲法的临床试验。

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3. Bioenergetics | 生物能学

Photosynthesis: carbon dioxide + water → glucose + oxygen (light energy). Equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Rate is affected by light intensity, CO₂ concentration, and temperature.

光合作用：二氧化碳 + 水 → 葡萄糖 + 氧气（光能）。方程式：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。速率受光照强度、二氧化碳浓度和温度影响。

Respiration: aerobic respiration releases energy from glucose using oxygen: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. Anaerobic respiration in muscles: glucose → lactic acid; in yeast: glucose → ethanol + carbon dioxide.

呼吸作用：有氧呼吸利用氧气从葡萄糖释放能量：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O。肌肉中的无氧呼吸：葡萄糖 → 乳酸；酵母中：葡萄糖 → 乙醇 + 二氧化碳。

Metabolism is the sum of all chemical reactions in cells. Exercise increases respiration; oxygen debt occurs after anaerobic respiration. Liver converts lactic acid back to glucose.

代谢是细胞中所有化学反应的总和。运动增强呼吸作用；无氧呼吸后产生氧债。肝脏将乳酸转化回葡萄糖。

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4. Atomic Structure & Periodic Table | 原子结构与周期表

Atoms contain protons (+1), neutrons (0), and electrons (-1). Atomic number = number of protons; mass number = protons + neutrons. Isotopes have the same number of protons but different neutrons.

原子含有质子（+1）、中子（0）和电子（-1）。原子序数 = 质子数；质量数 = 质子数 + 中子数。同位素具有相同的质子数但不同的中子数。

In the periodic table, groups show the number of outer electrons; periods show the number of shells. Group 1 (alkali metals) react vigorously with water, reactivity increases down the group. Group 7 (halogens) have 7 outer electrons, reactivity decreases down the group. Group 0 (noble gases) are unreactive with full outer shells.

在周期表中，族表示外层电子数；周期表示电子层数。第1族（碱金属）与水剧烈反应，反应性向下增强。第7族（卤素）有7个外层电子，反应性向下减弱。第0族（稀有气体）外层全满，不活泼。

Development of the periodic table: Mendeleev left gaps for undiscovered elements and predicted their properties, leading to acceptance.

周期表的发展：门捷列夫为未发现的元素留下空位并预测其性质，因而被接受。

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5. Bonding, Structure & Properties | 键合、结构与性质

Ionic bonding involves transfer of electrons between metal and non-metal, forming positive and negative ions held by electrostatic forces. Giant ionic lattices have high melting points and conduct electricity when molten or dissolved.

离子键涉及金属和非金属之间的电子转移，形成由静电引力保持的正负离子。巨型离子晶格具有高熔点，在熔融或溶解时导电。

Covalent bonding occurs when non-metal atoms share electron pairs. Simple molecular substances (e.g., H₂O, CO₂) have low melting points due to weak intermolecular forces. Giant covalent structures (diamond, graphite, silicon dioxide) have high melting points; graphite conducts electricity due to delocalised electrons.

共价键发生在非金属原子共享电子对时。简单分子物质（如水、二氧化碳）因分子间作用力弱而熔点低。巨型共价结构（金刚石、石墨、二氧化硅）具有高熔点；石墨因离域电子而导电。

Metallic bonding: positive metal ions in a ‘sea’ of delocalised electrons. Metals are good conductors of heat/electricity, malleable. Alloys are harder because different atom sizes disrupt layers.

金属键：正金属离子处于离域电子的’海洋’中。金属是热和电的良导体，有延展性。合金因不同原子大小打乱层状结构而更硬。

Nanoparticles have diameters 1-100 nm; high surface area to volume ratio, used in medicine, electronics, and cosmetics.

纳米颗粒直径1-100纳米，具有高表面积体积比，用于医药、电子和化妆品。

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6. Quantitative Chemistry | 定量化学

Relative formula mass (Mᵣ) is the sum of relative atomic masses (Aᵣ) of all atoms in formula. The mole is the amount of substance containing 6.02×10²³ particles. Mass (g) = moles × Mᵣ.

相对配方质量（Mᵣ）是化学式中所有原子相对原子质量（Aᵣ）的总和。摩尔是含有6.02×10²³个粒子的物质的量。质量（克）= 摩尔数 × Mᵣ。

Percentage yield = (actual yield / theoretical yield) × 100. Atom economy = (Mᵣ of desired product / sum of Mᵣ of all reactants) × 100. High atom economy reduces waste and increases sustainability.

百分产率 =（实际产率 / 理论产率）× 100。原子经济性 =（期望产物的Mᵣ / 所有反应物Mᵣ之和）× 100。高原子经济性减少废物，增加可持续性。

Concentration (g/dm³) = mass (

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