📚 Year 10 OCR Science: Core Knowledge Revision | Year 10 OCR 科学：核心知识点梳理
This revision guide covers the essential topics in Year 10 OCR Gateway Science, including key concepts from biology, chemistry and physics. Mastering these fundamentals will help you build a strong foundation for your GCSEs and prepare you effectively for end‑of‑year assessments.
这份复习指南涵盖了 OCR Gateway 科学课程 Year 10 的核心内容，包括生物、化学和物理中的关键概念。掌握这些基础知识将帮助你为 GCSE 打下扎实的基础，并有效应对学年末的测评。
1. Cells and Microscopy | 细胞与显微镜
All living organisms are made of cells. Eukaryotic cells (in plants and animals) have a nucleus, cytoplasm and a cell membrane, while prokaryotic cells (bacteria) lack a true nucleus and have free‑floating DNA.
所有生物都由细胞构成。真核细胞（动植物）具有细胞核、细胞质和细胞膜，而原核细胞（细菌）没有真正的细胞核，DNA 游离在细胞质中。
Animal cells contain mitochondria for aerobic respiration, ribosomes for protein synthesis, and may have small temporary vacuoles. Plant cells additionally have a cellulose cell wall, a large permanent vacuole filled with cell sap, and chloroplasts that absorb light for photosynthesis.
动物细胞含有用于有氧呼吸的线粒体、用于蛋白质合成的核糖体，并可能具有小型临时液泡。植物细胞额外具有纤维素细胞壁、充满细胞液的大型永久液泡和吸收光能进行光合作用的叶绿体。
. We must prepare specimens on a slide, often with a drop of water and a coverslip, and start with the lowest power objective when focusing.
使用光学显微镜时，总放大倍数 = 目镜放大倍数 × 物镜放大倍数。我们需要在载玻片上制备标本，通常滴一滴水并盖上盖玻片，调焦时应从低倍物镜开始。
2. Enzymes and Digestion | 酶与消化
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are proteins with a specific active site that fits a substrate like a lock and key; the shape of the active site is affected by temperature and pH.
酶是生物催化剂，能够加速生物体内的化学反应。它们是一种具有特定活性位点的蛋白质，活性位点与底物的结合如同锁和钥匙；活性位点的形状受温度和 pH 影响。
If the temperature or pH is too high, the enzyme denatures: its active site changes shape permanently, and it can no longer catalyse the reaction. Each enzyme works best at an optimum temperature (around 37 °C for human enzymes) and an optimum pH (e.g. pepsin in the stomach works best at pH 2).
如果温度或 pH 过高，酶会变性：其活性位点永久改变形状，无法再催化反应。每种酶都有最适温度（人体酶约为 37 °C）和最适 pH（例如胃蛋白酶在 pH 2 时活性最佳）。
Digestive enzymes convert large insoluble molecules into small soluble ones that can be absorbed into the blood. Amylase breaks down starch into maltose; proteases break proteins into amino acids; lipases break lipids into fatty acids and glycerol.
消化酶将大分子不溶性物质分解为可溶于水的小分子，以便被血液吸收。淀粉酶将淀粉分解为麦芽糖；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。
3. The Circulatory System and Blood | 循环系统与血液
The human circulatory system is a double system: blood passes through the heart twice on each full circuit – once to the lungs (pulmonary circuit) and once to the rest of the body (systemic circuit). The heart has four chambers: left and right atria and left and right ventricles.
人体循环系统为双循环系统：血液每一次完整循环两次经过心脏——一次流向肺部（肺循环），一次流向全身（体循环）。心脏有四个腔室：左、右心房和左、右心室。
Arteries carry blood away from the heart at high pressure; they have thick, elastic muscular walls. Veins carry blood back to the heart at low pressure and contain valves to prevent backflow. Capillaries are one‑cell‑thick vessels where materials are exchanged between blood and tissues.
动脉将血液从心脏送出，血压较高，管壁厚而有弹性。静脉将血液送回心脏，血压较低，含有瓣膜防止倒流。毛细血管壁仅有一层细胞，是血液与组织之间物质交换的场所。
Blood consists of red blood cells (transport oxygen, contain haemoglobin), white blood cells (defence against pathogens), platelets (help blood clotting) and plasma which transports carbon dioxide, hormones and waste.
血液由红细胞（运输氧气，含血红蛋白）、白细胞（防御病原体）、血小板（帮助血液凝固）和血浆（运输二氧化碳、激素及废物）组成。
4. Atomic Structure and the Periodic Table | 原子结构与元素周期表
An atom consists of a small central nucleus containing positively charged protons and neutral neutrons, surrounded by electrons arranged in energy levels (shells). The atomic number is the number of protons, and the mass number is the total of protons and neutrons.
原子由一个微小的中心原子核及绕核排布在能级（电子层）上的电子构成。原子核内含有带正电的质子与不带电的中子。原子序数等于质子数，质量数为质子数与中子数之和。
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. They have identical chemical properties but slightly different physical properties such as mass.
同位素是同一元素中质子数相同但中子数不同的原子。它们的化学性质完全相同，但物理性质（如质量）略有差异。
In the periodic table, elements are arranged in order of increasing atomic number. Rows are called periods; columns are groups. Elements in the same group have the same number of outer‑shell electrons and therefore similar chemical reactions. Group 0 (noble gases) are unreactive because they have a full outer shell.
在周期表中，元素按原子序数递增排列。横排称为周期，纵列称为族。同一族元素具有相同的最外层电子数，因此化学性质相似。第 0 族（稀有气体）因为具有满壳层结构而不活泼。
5. Bonding and Structure | 化学键与结构
Ionic bonding occurs between metals and non‑metals. Metal atoms lose electrons to form positive cations, while non‑metal atoms gain electrons to form negative anions. The strong electrostatic forces between oppositely charged ions hold the giant ionic lattice together.
离子键形成于金属与非金属之间。金属原子失去电子形成阳离子，非金属原子获得电子形成阴离子。相反电荷离子之间的强静电引力将巨型离子晶格结合在一起。
Ionic compounds have high melting and boiling points, and they conduct electricity when molten or dissolved in water because the ions are free to move.
离子化合物具有高熔点和高沸点，在熔融或溶于水时能导电，因为此时离子可以自由移动。
Covalent bonding occurs when atoms share pairs of electrons, usually between non‑metals. Simple molecular substances like water or carbon dioxide have low melting and boiling points and do not conduct electricity. Giant covalent structures, such as diamond and graphite, have very high melting points due to extensive networks of strong bonds.
共价键通常形成于非金属原子之间，通过共享电子对实现。简单分子物质（如水或二氧化碳）熔沸点低，不导电。巨型共价结构（如金刚石和石墨）由于存在大量强键的网络，熔点非常高。
6. Chemical Equations and Quantitative Chemistry | 化学方程式与定量化学
Atoms are rearranged in chemical reactions; mass is always conserved. Symbol equations must be balanced so that there are equal numbers of each type of atom on both sides. State symbols are added: (s) solid, (l) liquid, (g) gas and (aq) aqueous.
化学反应中原子重新排列，质量始终守恒。符号方程式必须配平，使两边每一种原子的数目相等。需要标上状态符号：(s) 固体，(l) 液体，(g) 气体，(aq) 水溶液。
Percentage by mass of an element = (total mass of the element in the formula ÷ Mᵣ) × 100.
相对化学式质量（Mᵣ）等于化学式中所有原子的相对原子质量之和。元素的质量百分数 = (该元素在化学式中的总质量 ÷ Mᵣ) × 100。
Using balanced equations, we can predict the masses of reactants and products. The mole concept (one mole is an amount of substance containing Avogadro’s number of particles) may be introduced, but Year 10 often focuses on reacting mass calculations using the ratio of moles from Mᵣ.
利用配平的方程式，我们可以预测反应物与生成物的质量。摩尔概念（一摩尔是含有阿伏伽德罗常数个粒子的物质的量）可能有所涉及，但 Year 10 通常侧重于利用 Mᵣ 得出的摩尔比进行反应质量计算。
7. Energy Stores and Transfers | 能量储存与转移
Energy can be stored in different ways: kinetic, gravitational potential, elastic potential, thermal (internal), chemical, nuclear, electrostatic and magnetic. In any process, energy is transferred between stores; it is never created or destroyed (conservation of energy).
能量可以以不同形式储存：动能、重力势能、弹性势能、热能（内能）、化学能、核能、静电势能和磁能。在任何过程中，能量在储存库之间转移；能量不会凭空产生或消失（能量守恒）。
force (m). Power is the rate of doing work: power (W) = energy transferred (J) ÷ time (s).
功是力使物体移动时转移的能量。做的功 (J) = 力 (N) × 沿力的方向移动的距离 (m)。功率是做功的快慢：功率 (W) = 能量转移量 (J) ÷ 时间 (s)。
When heating a substance, the energy required to raise its temperature can be calculated using the specific heat capacity equation:
ΔE = m × c × Δθ
where ΔE is the change in thermal energy (J), m is mass (kg), c is specific heat capacity (J/kg°C) and Δθ is the temperature change (°C).
加热物质时，升高温度所需的能量可用比热容公式计算：ΔE = m × c × Δθ，其中 ΔE 为内能变化量 (J)，m 为质量 (kg)，c 为比热容 (J/kg°C)，Δθ 为温度变化 (°C)。
8. Electricity and Circuits | 电与电路
ential difference (V) in volts (V) is the energy transferred per unit of charge. Resistance (R) in ohms (Ω) opposes the flow of current: V = I × R.
电流是电荷的流动。在金属导线中，电荷载体是自由电子。电流 (I) 以安培 (A) 计量。电压 (V) 以伏特 (V) 计量，是单位电荷转移的能量。电阻 (R) 以欧姆 (Ω) 计量，阻碍电流流动，遵循 V = I × R。
In a series circuit, the current is the same everywhere, and the total potential difference is shared between components. In a parallel circuit, the potential difference across each branch is the same as the supply, and the total current is the sum of the branch currents.
在串联电路中，各处电流相同，总电压在各元件间分配。在并联电路中，各支路两端的电压与电源电压相同，干路电流等于各支路电流之和。
Ohm’s law states that, at constant temperature, the current through a resistor is directly proportional to the potential difference across it. However, some components, such as a filament lamp, do not obey Ohm’s law because their resistance increases as they heat up.
欧姆定律指出，在温度不变时，通过电阻器的电流与其两端的电压成正比。然而，某些元件如灯丝灯泡不符合欧姆定律，因为其电阻随温度升高而增大。
9. States of Matter and Particle Model | 物质状态与粒子模型
Matter exists as solid, liquid or gas. In solids, particles are closely packed, vibrate about fixed positions and have the least energy. In liquids, particles are close together but can move past each other. In gases, particles are far apart, move randomly and have the most energy.
物质以固态、液态或气态存在。固体中，粒子紧密排列，在固定位置振动，能量最低。液体中，粒子彼此靠近但能相对滑动。气体中，粒子相距较远，做无规则运动，能量最高。
When a substance changes state, its temperature remains constant during the change even though energy is still being transferred. The energy is used to break intermolecular bonds rather than raise kinetic energy; this is called latent heat.
当物质发生状态变化时，尽管仍在传递能量，其温度在变化期间保持不变。这些能量用于打破分子间作用力，而不是增加粒子的动能，这被称为潜热。
le model explains why solids usually have high density, liquids slightly lower density, and gases have very low density.
密度 (ρ) 是物质单位体积的质量：ρ = m ÷ V。粒子模型可以解释固体通常密度较高、液体密度稍低、气体密度非常低的原因。
10. Radioactivity and the Nuclear Model | 放射性及核模型
Some atomic nuclei are unstable and emit radiation to become more stable – this process is radioactive decay. The three main types of radiation are alpha (α), beta (β) and gamma (γ).
一些原子核不稳定，会通过释放辐射变得更为稳定，这一过程称为放射性衰变。三种主要的辐射类型为 α（阿尔法）、β（贝塔）和 γ（伽马）。
An alpha particle consists of two protons and two neutrons (a helium nucleus: ⁴₂He), has a +2 charge and is the most ionising but least penetrating. A beta particle is a fast‑moving electron emitted when a neutron turns into a proton; it is moderately ionising and penetrating. Gamma radiation is an electromagnetic wave with no mass or charge, low ionising power but very high penetrating ability.
α 粒子由两个质子和两个中子组成（即氦核：⁴₂He），带 +2 电荷，电离能力最强但穿透力最弱。β 粒子是中子转变为质子时释放出的高速电子，具有中等的电离能力和穿透力。γ 辐射是一种电磁波，无质量、不带电荷，电离能力弱但穿透力极强。
The half‑life of a radioactive isotope is the time taken for half the unstable nuclei in a sample to decay. It can be used to predict how the activity of a sample changes over time and has applications in radioactive dating and medical tracers.
放射性同位素的半衰期是样本中一半不稳定核发生衰变所需的时间。它可用于预测样品活度随时间的变化，并应用于放射性定年和医用示踪剂等方面。
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