📚 Year 11 AQA Science: Core Knowledge Review | Year 11 AQA 科学：核心知识点梳理
Year 11 AQA Science covers a substantial body of knowledge across Biology, Chemistry, and Physics, often examined through the Combined Science: Trilogy or separate science routes. This article consolidates the essential topics, key equations, and core concepts that students must master for their GCSE examinations. Each section pairs clear explanations in English and Chinese to support bilingual learners and reinforce understanding.
Year 11 AQA 科学涵盖生物、化学和物理的大量知识，通常以综合科学：三部曲或单独科学途径进行考核。本文整理了学生在 GCSE 考试中必须掌握的核心主题、关键公式和重要概念。每个部分都配有中英双语的清晰解释，帮助双语学习者巩固理解。
1. Cell Structure and Function | 细胞结构与功能
All living organisms are composed of cells, which can be eukaryotic (with a nucleus) or prokaryotic (without a nucleus). Animal and plant cells are eukaryotic and share common structures such as the cell membrane, cytoplasm, and genetic material enclosed in a nucleus.
所有生物体都由细胞组成，细胞可分为真核细胞（有细胞核）和原核细胞（无细胞核）。动物和植物细胞都是真核细胞，具有细胞膜、细胞质和包围在细胞核内的遗传物质等共同结构。
Plant cells additionally contain a rigid cell wall made of cellulose, a large permanent vacuole for storage and support, and chloroplasts which carry out photosynthesis. Specialised cells, such as root hair cells, sperm cells, and nerve cells, have adaptations that enable them to perform specific functions efficiently.
植物细胞还含有由纤维素构成的坚硬细胞壁、用于储存和支撑的大液泡，以及进行光合作用的叶绿体。特化细胞如根毛细胞、精子细胞和神经细胞具有适应其特定功能的结构。
The key equation linking magnification, image size, and actual size is:
放大倍数、图像尺寸和实际尺寸之间的关键公式为：
magnification = image size ÷ actual size
放大倍数 = 图像尺寸 ÷ 实际尺寸
Microscopy techniques, including light microscopes and electron microscopes, have revolutionised our understanding of sub-cellular structures. Electron microscopes have a much higher resolution, allowing scientists to see smaller organelles like ribosomes and mitochondria in detail.
显微镜技术，包括光学显微镜和电子显微镜，彻底改变了我们对亚细胞结构的认识。电子显微镜具有更高的分辨率，使科学家能够详细观察到核糖体和线粒体等更小的细胞器。
2. Cell Division and Inheritance | 细胞分裂与遗传
Cell division occurs through mitosis for growth and repair, and meiosis for producing gametes. Mitosis produces two genetically identical diploid daughter cells, essential for replacing damaged cells and asexual reproduction.
细胞分裂通过有丝分裂实现生长和修复，通过减数分裂产生配子。有丝分裂产生两个遗传上相同的二倍体子细胞，对替换受损细胞和无性生殖至关重要。
Meiosis halves the chromosome number to form haploid gametes, introducing genetic variation through independent assortment and crossing over. The fusion of gametes during fertilisation restores the diploid number and creates a unique combination of alleles.
减数分裂将染色体数目减半以形成单倍体配子，通过独立分配和交叉互换引入遗传变异。受精过程中配子的融合恢复了二倍体数目，并创造了独特的等位基因组合。
Inheritance follows patterns described by monohybrid crosses, where dominant and recessive alleles determine phenotypes. Punnett squares can predict the probability of offspring inheriting certain traits, such as cystic fibrosis (recessive) or polydactyly (dominant).
遗传遵循单基因杂交模式，显性和隐性等位基因决定表型。旁氏表可以预测后代继承某些性状的概率，如囊性纤维化（隐性）或多指症（显性）。
Sex determination in humans relies on the XX (female) and XY (male) chromosome pair. The father’s sperm determines the sex of the child, as mothers always contribute an X chromosome.
人类的性别决定取决于 XX（女性）和 XY（男性）染色体对。父亲的精子决定了孩子的性别，因为母亲总是贡献一条 X 染色体。
3. Atomic Structure and the Periodic Table | 原子结构与周期表
All substances are made of atoms, which consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The atomic number represents the number of protons, while the mass number is the sum of protons and neutrons.
所有物质都由原子组成，原子由包含质子和中子的原子核以及核外分层排布的电子构成。原子序数代表质子数，而质量数是质子数与中子数之和。
Isotopes are atoms of the same element with different numbers of neutrons, hence different mass numbers. The relative atomic mass (Aᵣ) of an element is an average of the masses of its isotopes, weighted by their abundance.
同位素是同一元素的原子，其中子数不同，因此质量数不同。元素的相对原子质量（Aᵣ）是其同位素质量的加权平均值，根据丰度计算。
The modern periodic table arranges elements in order of increasing atomic number. Elements in the same group have the same number of electrons in their outer shell, giving them similar chemical properties. Group 1 (alkali metals) are highly reactive, while Group 7 (halogens) are reactive non-metals, and Group 0 (noble gases) are unreactive.
现代周期表按原子序数递增排列元素。同族元素的外层电子数相同，因此化学性质相似。第 1 族（碱金属）非常活泼，第 7 族（卤素）是活泼的非金属，第 0 族（稀有气体）则不活泼。
Electronic configuration determines chemical behaviour. For example, sodium (2,8,1) needs to lose one electron to achieve a stable octet, while chlorine (2,8,7) needs to gain one electron.
电子排布决定了化学行为。例如，钠 (2,8,1) 需要失去一个电子以达到稳定的八隅体结构，而氯 (2,8,7) 需要获得一个电子。
4. Chemical Bonding and Properties | 化学键合与物质性质
Chemical bonding involves the transfer or sharing of electrons to achieve stable electronic configurations. Ionic bonding occurs between metals and non-metals, where electrons are transferred, forming oppositely charged ions held together by strong electrostatic forces.
化学键合涉及电子的转移或共享以达到稳定的电子排布。离子键合发生在金属和非金属之间，电子发生转移，形成带相反电荷的离子，通过强静电作用力结合在一起。
Ionic compounds have high melting and boiling points and conduct electricity when molten or dissolved because the ions are free to move. They form giant ionic lattice structures, which are regular and repeating.
离子化合物具有高熔点和高沸点，在熔融或溶解时能够导电，因为离子可以自由移动。它们形成规则的、重复的巨型离子晶格结构。
Covalent bonding occurs between non-metals, with atoms sharing pairs of electrons. Simple molecular substances like H₂O and CO₂ have low melting points and do not conduct electricity, because the intermolecular forces are weak, albeit the covalent bonds within molecules are strong.
共价键合发生在非金属之间，原子通过共享电子对结合。像 H₂O 和 CO₂ 这样的简单分子物质具有低熔点且不导电，因为分子间作用力很弱，尽管分子内的共价键很强。
Giant covalent structures, such as diamond, graphite, and silicon dioxide, have very high melting points and exceptional hardness or conductivity. Graphite conducts electricity due to delocalised electrons between layers, whereas diamond does not.
巨型共价结构，如金刚石、石墨和二氧化硅，具有极高的熔点和卓越的硬度或导电性。石墨由于层间有离域电子而导电，而金刚石则不能。
Metallic bonding features a ‘sea’ of delocalised electrons around positive metal ions, explaining properties like malleability and electrical conductivity. Alloys are mixtures of metals designed to have enhanced hardness by disrupting the regular layer arrangement.
金属键合的特点是正金属离子周围有’离域电子海’，解释了诸如延展性和导电性等性质。合金是金属的混合物，通过打乱规则的层排列来提高硬度。
5. Chemical Reactions and Quantitative Chemistry | 化学反应与定量化学
Chemical reactions are represented by balanced symbol equations, which follow the law of conservation of mass. The total mass of reactants equals the total mass of products because atoms are rearranged, not created or destroyed.
化学反应用平衡的符号方程式表示，遵循质量守恒定律。反应物的总质量等于生成物的总质量，因为原子只是重新排列，并没有被创造或消灭。
The mole is the unit for amount of substance, defined as the amount containing Avogadro’s number (6.02 × 10²³) of entities. The mass of one mole of a substance (molar mass) can be calculated from relative atomic masses.
摩尔是物质的量的单位，定义为含有阿伏伽德罗常数 (6.02 × 10²³) 个实体的数量。一摩尔物质的质量（摩尔质量）可通过相对原子质量计算。
Key quantitative equations include:
关键的定量公式包括：
number of moles = mass (g) ÷ molar mass (g/mol)
摩尔数 = 质量 (g) ÷ 摩尔质量 (g/mol)
Reacting masses can be predicted using mole ratios from the balanced equation. Limiting reactants determine the maximum amount of product formed, while the other reactants are in excess.
通过平衡方程式中的摩尔比可以预测反应质量。限量反应物决定了生成物的最大量，而其他反应物则过量。
Acids and bases react to form a salt and water (neutralisation). The general equation is: acid + base → salt + water. In reactions of acids with carbonates, carbon dioxide gas is evolved, and with metals, hydrogen gas is produced.
酸和碱反应生成盐和水（中和反应）。通式为：酸 + 碱 → 盐 + 水。酸与碳酸盐反应会释放二氧化碳气体，与金属反应则产生氢气。
6. Energy Changes in Reactions | 反应中的能量变化
Chemical reactions involve energy transfers. Exothermic reactions release energy to the surroundings, causing a temperature rise (e.g., combustion, neutralisation). Endothermic reactions absorb energy, leading to a temperature drop (e.g., thermal decomposition, photosynthesis).
化学反应涉及能量转移。放热反应向周围环境释放能量，导致温度升高（如燃烧、中和）。吸热反应吸收能量，导致温度下降（如热分解、光合作用）。
Reaction profiles show the energy of reactants and products, including the activation energy (Eₐ), which is the minimum energy needed for a reaction to occur. Catalysts provide an alternative pathway with a lower activation energy, increasing the rate of reaction without being used up.
反应剖面图显示反应物和生成物的能量，包括活化能 (Eₐ)，这是反应发生所需的最低能量。催化剂提供了较低活化能的替代途径，提高反应速率而自身不被消耗。
Bond energy calculations allow us to determine the overall energy change of a reaction by considering energy absorbed to break bonds and energy released when new bonds form. If more energy is released than absorbed, the reaction is exothermic; otherwise, it’s endothermic.
键能计算使我们能够通过考虑断键吸收的能量和成键释放的能量来确定反应的总能量变化。如果释放的能量多于吸收的能量，反应为放热；反之则为吸热。
7. Energy: Transfers and Resources | 能量：转移与资源
Energy can be stored in various forms such as kinetic, gravitational potential, elastic potential, thermal, chemical, and nuclear. Energy is conserved in transfers; it is never created or destroyed, only moved from one store to another or dissipated.
能量可以多种形式储存，如动能、重力势能、弹性势能、热能、化学能和核能。能量在转移中守恒；它不会被创造或消灭，只会从一个储存转移到另一个或者耗散。
Work done, power, and efficiency are linked by equations:
做功、功率和效率通过以下公式关联：
work done = force × distance (W = F s)
做功 = 力 × 距离 (W = F s)
power = work done ÷ time (P = W / t)
功率 = 做功 ÷ 时间 (P = W / t)
efficiency = useful output energy transfer ÷ total input energy transfer
效率 = 有用输出能量转移 ÷ 总输入能量转移
Gravitational potential energy (GPE = m g h) and kinetic energy (KE = ½ m v²) are fundamental equations. In a closed system, the sum of GPE and KE remains constant if no external forces do work.
重力势能 (GPE = m g h) 和动能 (KE = ½ m v²) 是基础方程。在封闭系统中，如果没有外力做功，GPE 和 KE 的总和保持不变。
Renewable energy resources, such as solar, wind, tidal, and wave power, are replenishable but can be unreliable. Non-renewable resources, including fossil fuels and nuclear power, are finite but reliable. Energy resource choices have environmental and economic implications.
可再生能源资源，如太阳能、风能、潮汐能和波浪能，是可再生的但可能不稳定。不可再生资源，包括化石燃料和核能，储量有限但可靠。能源选择对环境影响和经济成本有重要意义。
8. Electricity and Circuits | 电与电路
Electric current is the flow of charge. In a single closed loop, the current is the same everywhere. Charge (Q), current (I), and time (t) are related by:
电流是电荷的流动。在单个闭合回路中，各处电流相等。电荷量 (Q)、电流 (I) 和时间 (t) 的关系为：
Q = I t
Potential difference (V) is the energy transferred per unit charge. Ohm’s law for a resistor at constant temperature gives:
电势差 (V) 是每单位电荷转移的能量。恒定温度下电阻的欧姆定律为：
V = I R
In series circuits, the total resistance is the sum of individual resistances (R_total = R₁ + R₂ + …), and the current is the same through all components. In parallel circuits, the total current is split between branches, and the potential difference across each branch is the same.
串联电路中，总电阻是各个电阻之和 (R_total = R₁ + R₂ + …)，且通过所有组件的电流相同。并联电路中，总电流在分支中分配，各支路两端的电势差相等。
Electrical power (P) can be calculated using:
电功率 (P) 可以通过以下公式计算：
P = I V = I² R = V² / R
The National Grid transmits electricity at high potential difference and low current to reduce energy losses as heat. Transformers step-up voltage for transmission and step-down for safe domestic supply.
国家电网采用高电势差、低电流的方式输送电能，以减少热能损耗。变压器提升电压进行输送，再降低以供家庭安全使用。
9. Particle Model of Matter | 物质的粒子模型
The particle model describes the arrangement and movement of particles in solids, liquids, and gases. In solids, particles vibrate in fixed positions; in liquids, they can move past each other; in gases, they move rapidly in random directions.
粒子模型描述了固体、液体和气体中粒子的排列和运动。固体中粒子在固定位置振动；液体中粒子可以相互滑动；气体中粒子快速无规则运动。
Density (ρ) is mass per unit volume:
密度 (ρ) 是单位体积的质量：
ρ = m / V
Changes of state, such as melting, boiling, and condensing, involve energy transfers but not temperature changes during the process. The specific latent heat of fusion (L_f) and vaporisation (L_v) quantify the energy needed for a substance to change state without a change in temperature:
状态变化如熔化、沸腾和冷凝，涉及能量转移，但在此过程中温度不变。比潜热（熔化潜热 L_f 和汽化潜热 L_v）量化了物质在不改变温度的情况下改变状态所需的能量：
energy = mass × specific latent heat (E = m L)
能量 = 质量 × 比潜热 (E = m L)
Gas pressure is caused by particles colliding with container walls. Increasing temperature raises the kinetic energy of particles, leading to higher pressure if volume is constant, or expansion if the container is flexible.
气体压强由粒子与容器壁碰撞产生。温度升高会增加粒子的动能，若体积恒定则压强升高，若容器可变则体积膨胀。
10. Infection and Response | 感染与免疫
Pathogens, including viruses, bacteria, fungi, and protists, cause infectious diseases. They can spread through direct contact, airborne droplets, contaminated food or water, and vectors. Examples include measles (virus), salmonella (bacteria), and malaria (protist).
病原体，包括病毒、细菌、真菌和原生生物，会引起传染病。它们可通过直接接触、飞沫传播、污染的食物或水以及媒介生物传播。例如麻疹（病毒）、沙门氏菌（细菌）和疟疾（原生生物）。
The human body defends itself with physical barriers like skin and mucus, as well as the immune system. White blood cells engulf pathogens, produce antibodies, and release antitoxins. Vaccination exposes the immune system to a harmless form of a pathogen, stimulating antibody production and memory cell formation for future immunity.
人体通过皮肤和粘液等物理屏障以及免疫系统进行防御。白细胞吞噬病原体、产生抗体并释放抗毒素。疫苗接种让免疫系统接触无害的病原体形式，刺激抗体产生和记忆细胞形成，以提供未来的免疫力。
Antibiotics kill bacteria but are ineffective against viruses. The development of antibiotic-resistant bacteria, such as MRSA, is a serious concern, highlighting the need for responsible antibiotic use.
抗生素能够杀死细菌，但对病毒无效。抗生素耐药菌的发展，如 MRSA，是一个严重的问题，突显了负责任使用抗生素的必要性。
Monoclonal antibodies are identical antibodies produced from a single clone of cells. They are used in pregnancy tests, cancer treatment, and disease diagnosis. Their high specificity makes them valuable, though production and use raise ethical and practical issues.
单克隆抗体是由单一细胞克隆产生的相同抗体。它们被用于妊娠检测、癌症治疗和疾病诊断。其高度特异性使它们很有价值，尽管生产和应用涉及伦理和实际问题。
11. Ecology and the Environment | 生态与环境
Ecology studies the interactions between organisms and their environment. Producers, consumers, and decomposers maintain a steady flow of energy and recycling of matter within ecosystems. Food chains and food webs illustrate feeding relationships, with energy decreasing at each trophic level.
生态学研究生物与其环境之间的相互作用。生产者、消费者和分解者维持着生态系统内能量的流动和物质的循环。食物链和食物网展示了捕食关系，每一营养级的能量都会减少。
The carbon cycle and water cycle are essential for life. Carbon is recycled through photosynthesis, respiration, combustion, and decomposition. Water evaporates, condenses, and precipitates, continuously moving between land, ocean, and atmosphere.
碳循环和水循环对生命至关重要。碳通过光合作用、呼吸作用、燃烧和分解进行循环。水通过蒸发、凝结和降水，在陆地、海洋和大气之间持续移动。
Biodiversity ensures ecosystem stability. Human activities like deforestation, pollution, and global warming reduce biodiversity. Sustainable practices, such as reforestation, reducing greenhouse gas emissions, and protecting habitats, help preserve ecosystems for future generations.
生物多样性确保生态系统的稳定性。森林砍伐、污染和全球变暖等人类活动降低了生物多样性。可持续实践，如植树造林、减少温室气体排放和保护栖息地，有助于为子孙后代保护生态系统。
12. Radioactivity and Atomic Physics | 放射性及原子物理
Some atomic nuclei are unstable and emit radiation to become more stable. The three main types are alpha (α), beta (β), and gamma (γ) radiation. Alpha particles are helium nuclei, highly ionising but weakly penetrating; beta particles are high-speed electrons, moderately ionising and penetrating; gamma rays are electromagnetic waves, highly penetrating but weakly ionising.
有些原子核不稳定，会通过发射辐射变得稳定。三种主要类型是 α 辐射、β 辐射和 γ 辐射。α 粒子是氦核，电离能力强但穿透力弱；β 粒子是高速电子，电离能力和穿透力中等；γ 射线是电磁波，穿透力强但电离能力弱。
Radioactive decay is a random process, measured by the activity (decays per second) in becquerels (Bq). Half-life is the time taken for half of the radioactive nuclei in a sample to decay, or for the activity to halve. It can be used to date materials or monitor medical tracers.
放射性衰变是一个随机过程，用活度（每秒衰变次数）以贝克勒尔 (Bq) 为单位衡量。半衰期是样本中一半放射性原子核衰变，或活度减半所需的时间。它可以用于材料定年或监测医用示踪剂。
Nuclear fission is the splitting of a large nucleus (e.g., uranium-235) into smaller nuclei, releasing energy and neutrons. A chain reaction can be controlled in nuclear reactors. Nuclear fusion involves joining small nuclei (e.g., hydrogen isotopes) to form a heavier nucleus, releasing vast energy. Fusion powers the Sun but is difficult to achieve on Earth under controlled conditions.
核裂变是大核（如铀-235）分裂成较小核，释放能量和中子。链式反应可在核反应堆中被控制。核聚变涉及将小核（如氢同位素）结合成较重的核，释放巨大能量。聚变为太阳提供能量，但在地球上受控条件下难以实现。
Published by TutorHao | Science Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导