📚 Year 9 Edexcel Chemistry: Core Knowledge Organiser | 九年级爱德思化学：核心知识点梳理
Welcome to your complete Year 9 Edexcel Chemistry revision guide. This article condenses the most important concepts you will encounter, from atomic theory to chemical reactions, explained in clear, bilingual format to boost your confidence and exam readiness.
欢迎阅读九年级爱德思化学完整复习指南。本文将你将会遇到的最重要概念，从原子理论到化学反应，以清晰的双语形式呈现，旨在提升你的信心和备考能力。
1. Atoms and the Periodic Table | 原子与元素周期表
Atoms are the smallest particles of an element that can take part in chemical reactions. They consist of a tiny, dense nucleus containing protons and neutrons, surrounded by electrons arranged in shells or energy levels.
原子是元素能参与化学反应的最小粒子。它们由一个微小、致密的含有质子和中子的原子核，以及按电子层或能级排列的电子构成。
Protons carry a positive charge (+1), electrons a negative charge (-1) and neutrons have no charge. In a neutral atom, the number of protons equals the number of electrons.
质子带一个正电荷 (+1)，电子带一个负电荷 (-1)，中子不带电。在中性原子中，质子数等于电子数。
The atomic number (Z) is the number of protons in an atom and determines which element it is. The mass number (A) is the total number of protons and neutrons. Electrons occupy shells in the pattern 2,8,8 for the first 20 elements.
原子序数 (Z) 是原子中的质子数，决定了它属于哪种元素。质量数 (A) 是质子与中子的总数。前20号元素的电子按2,8,8的规律排布。
The periodic table arranges elements in order of increasing atomic number. Rows are called periods, and columns are called groups. Elements in the same group have similar chemical properties because they have the same number of outer‑shell electrons.
元素周期表按原子序数递增的顺序排列元素。横行称为周期，纵列称为族。同一族元素因最外层电子数相同而具有相似的化学性质。
Metals are found on the left and centre of the table and are typically shiny, conductive and malleable. Non‑metals are on the right and are often dull, brittle and poor conductors.
金属位于周期表的左侧和中部，通常有光泽、导电、可锻。非金属位于右侧，通常暗淡、脆性、不导电。
2. States of Matter and Changes of State | 物质状态与状态变化
Matter exists in three main states: solid, liquid and gas. The particle theory explains their properties: solids have fixed shape and volume with particles vibrating in fixed positions; liquids have a fixed volume but take the shape of the container, with particles sliding past each other; gases have no fixed shape or volume and their particles move rapidly in all directions.
物质主要以三种状态存在：固态、液态和气态。粒子理论解释了它们的性质：固体有固定的形状和体积，粒子在固定位置上振动；液体有固定体积但形状随容器而定，粒子相互滑动；气体没有固定形状或体积，粒子快速向各个方向运动。
Changes of state are physical changes: melting (solid to liquid), freezing (liquid to solid), boiling or evaporation (liquid to gas) and condensation (gas to liquid). Sublimation is the direct change from solid to gas, as seen in solid carbon dioxide (dry ice).
状态变化属于物理变化：熔化（固→液）、凝固（液→固）、沸腾或蒸发（液→气）、冷凝（气→液）。升华是固体直接变为气体，如固态二氧化碳（干冰）所示。
During a state change, the temperature remains constant while the energy is used to overcome the forces between particles. The melting point and boiling point are characteristic properties of a pure substance.
状态变化过程中，温度保持恒定，因为能量用于克服粒子间作用力。熔点和沸点是纯物质的特征性质。
The amount of energy needed to change state depends on the strength of the forces between particles and the mass of the substance.
状态变化所需能量的多少取决于粒子间作用力的强度和物质的质量。
3. Chemical vs Physical Changes | 化学变化与物理变化
A physical change alters the state, shape or appearance of a substance but does not produce a new substance. Examples include dissolving salt in water, breaking a glass and melting ice. These changes are often easy to reverse.
物理变化会改变物质的状态、形状或外观，但不产生新物质。例子有食盐溶于水、打碎玻璃、冰融化等。这些变化通常容易逆转。
A chemical change (chemical reaction) results in the formation of one or more new substances with different properties. Signs of a chemical reaction include colour change, gas production (bubbles or effervescence), temperature change, appearance of a precipitate (solid) or a permanent change that cannot be easily reversed.
化学变化（化学反应）会产生一种或多种性质不同的新物质。化学反应的迹象包括颜色变化、产生气体（气泡或冒泡）、温度变化、出现沉淀（固体）或不易逆转的永久性变化。
During any chemical reaction, atoms are rearranged but not created or destroyed. This is the law of conservation of mass: the total mass of reactants equals the total mass of products.
在任何化学反应中，原子重新排列，既不会被创造也不会被消灭。这就是质量守恒定律：反应物的总质量等于生成物的总质量。
If mass appears to change in an open container, it is usually because a gas has entered or escaped. Reactions carried out in a sealed system will show constant mass.
如果在开放容器中质量似乎发生了变化，通常是因为气体进入或逸出。在封闭系统中进行的反应会显示质量恒定。
4. Elements, Compounds and Mixtures | 元素、化合物与混合物
An element is a pure substance made of only one type of atom. All the atoms in an element have the same atomic number. Examples include oxygen (O₂), iron (Fe) and gold (Au).
元素是由仅一种原子组成的纯净物。元素中的所有原子都具有相同的原子序数。例子包括氧气 (O₂)、铁 (Fe) 和金 (Au)。
A compound is a pure substance made of two or more different elements chemically joined in a fixed proportion. The properties of a compound are different from those of the elements it contains. Water (H₂O), carbon dioxide (CO₂) and sodium chloride (NaCl) are common compounds.
化合物是由两种或多种不同元素以固定比例通过化学方式结合而成的纯净物。化合物的性质与其所含元素的性质不同。水 (H₂O)、二氧化碳 (CO₂) 和氯化钠 (NaCl) 是常见化合物。
A mixture consists of two or more substances that are physically combined and not chemically joined. The composition of a mixture can vary. Air, seawater and soil are mixtures. Mixtures can be separated by physical techniques.
混合物由两种或多种物质物理混合而成，未通过化学方式结合。混合物的组成可以变化。空气、海水和土壤都是混合物。混合物可以通过物理方法分离。
Naming simple compounds follows rules: the metal name comes first, followed by the non‑metal with the ending changed to '-ide' (e.g. magnesium oxide). When two non‑metals combine, prefixes like 'mono‑', 'di‑' and 'tri‑' are used (e.g. carbon dioxide, sulfur trioxide).
简单化合物的命名遵循规则：金属名称在前，非金属在后，且词尾改为“-ide”（如 magnesium oxide）。当两种非金属结合时，使用“mono-”、“di-”、“tri-”等前缀（如二氧化碳 carbon dioxide、三氧化硫 sulfur trioxide）。
5. Writing and Balancing Equations | 化学方程式的书写与配平
A word equation shows the names of the reactants and products. For example: magnesium + oxygen → magnesium oxide. Word equations are useful for identifying the chemicals involved.
文字方程式显示了反应物和生成物的名称。例如：镁 + 氧气 → 氧化镁。文字方程式有助于确定所涉及的化学物质。
A balanced symbol equation uses chemical formulae and shows the number of atoms of each element on both sides. To write a balanced equation, first write the correct formulae for all substances, then place numbers (coefficients) in front of the formulae so that the same number of each type of atom appears on each side.
配平的符号方程式使用化学式，并显示两边每种元素的原子数。书写配平方程式时，先写出所有物质的正确化学式，然后在化学式前面放置数字（系数），使得每种原子在两边的数量相同。
2Mg + O₂ → 2MgO
You may need to add state symbols to show the physical state: (s) for solid, (l) for liquid, (g) for gas and (aq) for aqueous solution, meaning dissolved in water.
你可能需要添加状态符号来表示物理状态：(s) 表示固体，(l) 表示液体，(g) 表示气体，(aq) 表示水溶液，即溶于水。
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)
When balancing, never change the small subscript numbers inside a formula. Only adjust the large numbers in front. This skill is essential for quantitative chemistry and understanding mole ratios later.
配平时，切勿改变化学式内部的小下标数字。只调整前面的系数。这项技能对于后续的定量化学和理解摩尔比至关重要。
6. Acids and Alkalis | 酸和碱
Acids are substances that release hydrogen ions (H⁺) when dissolved in water. Common laboratory acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃).
酸是溶于水时释放氢离子 (H⁺) 的物质。常见的实验室酸包括盐酸 (HCl)、硫酸 (H₂SO₄) 和硝酸 (HNO₃)。
Alkalis are soluble bases that release hydroxide ions (OH⁻) in water. Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are typical alkalis. A base is any substance that neutralises an acid, but not all bases are alkalis.
碱是可溶性的碱，在水中释放氢氧根离子 (OH⁻)。氢氧化钠 (NaOH) 和氢氧化钾 (KOH) 是典型的碱。任何能中和酸的物质都叫碱，但并非所有的碱都可溶。
The pH scale ranges from 0 to 14. Acids have a pH less than 7, alkalis have a pH greater than 7, and a pH of 7 is neutral. Universal indicator gives a range of colours across the scale, while litmus turns red in acid and blue in alkali.
pH 值的范围是 0 到 14。酸的 pH 小于 7，碱的 pH 大于 7，pH 为 7 时为中性。通用指示剂在整个范围内呈现多种颜色，而石蕊试纸在酸性中变红，在碱性中变蓝。
+ OH⁻ → H₂O. For example: hydrochloric acid + sodium hydroxide → sodium chloride + water.
中和反应是酸和碱反应生成盐和水的过程。总的离子方程式是：H⁺ + OH⁻ → H₂O。例如：盐酸 + 氢氧化钠 → 氯化钠 + 水。
You can name the salt formed by taking the first part from the metal (or base) and the second part from the acid. Hydrochloric acid gives chlorides, sulfuric acid gives sulfates and nitric acid gives nitrates.
你可以通过取金属（或碱）的前一部分和酸的后一部分来命名生成的盐。盐酸生成氯化物，硫酸生成硫酸盐，硝酸生成硝酸盐。
7. Reactivity Series and Displacement | 活泼性顺序与置换反应
The reactivity series lists metals in order of their readiness to react. A typical order from most to least reactive is: potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, copper, silver, gold. Carbon and hydrogen are often included for comparison with extraction methods.
活泼性顺序按金属参与反应的难易程度排列。从最活泼到最不活泼的常见顺序为：钾、钠、钙、镁、铝、锌、铁、铅、铜、银、金。碳和氢气也常被列入，以便比较提炼方法。
2HCl(aq) → MgCl₂(aq) + H₂(g). Less reactive metals like copper show no reaction with dilute acids.
活泼性较强的金属会与水或酸剧烈反应，产生氢气。例如，镁与盐酸反应：Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)。活泼性较弱的金属如铜不与稀酸反应。
copper sulfate solution: Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s). The blue colour fades as copper metal forms.
当较活泼的金属将较不活泼的金属从其化合物中置换出来时，发生置换反应。例如，在硫酸铜溶液中加入铁屑：Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)。随着铜金属的生成，蓝色逐渐褪去。
The reactivity series also explains why some metals are extracted by heating with carbon (e.g. iron from iron oxide) while very reactive metals such as aluminium must be extracted using electricity (electrolysis).
活泼性顺序也解释了为什么有些金属通过用碳加热提炼（如从氧化铁中提炼铁），而像铝这样非常活泼的金属必须用电能（电解）来提炼。
8. Separation Techniques | 分离技术
Mixtures can be separated by exploiting differences in their physical properties. The choice of technique depends on the type of mixture and the properties of its components.
混合物可以通过利用物理性质的差异来分离。方法的选择取决于混合物的类型及其组分的性质。
Filtration is used to separate an insoluble solid from a liquid. The mixture passes through filter paper; the solid residue stays on the paper and the filtrate passes through. For example, separating sand from water.
过滤用于分离不溶性固体和液体。混合物通过滤纸；固体残渣留在纸上，滤液通过。例如，从水中分离沙子。
Crystallisation or evaporation is used to obtain a soluble salt from a solution. The solution is heated gently; the solvent evaporates slowly, leaving behind crystals of the solute. Careful heating prevents decomposition.
结晶或蒸发用于从溶液中获取可溶性盐。将溶液缓慢加热；溶剂逐渐蒸发，留下溶质晶体。小心加热可防止分解。
Distillation separates a solvent from a solution or mixtures of liquids with different boiling points. Simple distillation involves boiling the mixture and condensing the vapour back to liquid. Fractional distillation separates liquids with closer boiling points, as in separating ethanol and water.
蒸馏用于将溶剂从溶液中分离出来，或分离沸点不同的液体混合物。简单蒸馏包括将混合物煮沸，然后将蒸气冷凝回液体。分馏用于分离沸点较接近的液体，例如分离乙醇和水。
Chromatography separates dissolved substances based on their different affinities for a stationary phase and a mobile phase. In paper chromatography, dyes move different distances up the paper. Rf values can be calculated to identify substances.
色谱法根据溶解物质对固定相和流动相的不同亲和度进行分离。在纸色谱中，染料在纸上移动的距离不同。可以计算 Rf 值来鉴别物质。
9. The Earth's Atmosphere and Climate Change | 地球大气与气候变化
The Earth's early atmosphere was mainly carbon dioxide, with little oxygen, released by volcanic activity. Over time, photosynthesis by algae and plants reduced CO₂ levels and increased oxygen, leading to the atmosphere we have today.
地球早期大气主要由二氧化碳组成，氧气极少，由火山活动释放。随着时间的推移，藻类和植物的光合作用降低了 CO₂ 水平并增加了氧气，形成了今天的大气。
Today, the atmosphere is roughly 78 % nitrogen, 21 % oxygen, 0.9 % argon, 0.04 % carbon dioxide and variable amounts of water vapour. Trace amounts of other gases are also present.
如今，大气大约由 78% 氮气、21% 氧气、0.9% 氩气、0.04% 二氧化碳以及不定量的水蒸气组成。还存在微量的其他气体。
Greenhouse gases, including carbon dioxide, methane and water vapour, trap heat from the Sun and keep Earth warm enough for life. However, human activities such as burning fossil fuels, deforestation and farming have increased greenhouse gas concentrations, leading to an enhanced greenhouse effect.
温室气体，包括二氧化碳、甲烷和水蒸气，会捕获来自太阳的热量，使地球保持足够温暖以维持生命。然而，燃烧化石燃料、砍伐森林和农业等人类活动增加了温室气体浓度，导致了增强的温室效应。
This is causing global warming and climate change, with effects such as rising sea levels, melting ice caps and more extreme weather events. Scientists monitor atmospheric CO₂ at stations such as Mauna Loa.
这正在引起全球变暖和气候变化，影响包括海平面上升、冰盖融化和更频繁的极端天气事件。科学家们在莫纳罗亚等地监测大气 CO₂ 浓度。
Reducing our carbon footprint involves using renewable energy, improving energy efficiency, planting trees and developing carbon capture technologies.
减少我们的碳足迹包括使用可再生能源、提高能源效率、植树造林以及开发碳捕获技术。
10. Key Skills: Graphs, Tables and Safety | 关键技能：图表、实验及安全
Chemistry requires careful handling of data. When plotting graphs, the independent variable goes on the x‑axis and the dependent variable on the y‑axis. Axes must be labelled with quantity and unit, scales should be linear and points plotted accurately, then a line of best fit drawn.
化学需要仔细处理数据。绘制图表时，自变量置于 x 轴，因变量置于 y 轴。坐标轴必须标明数量和单位，刻度应线性，点要准确标出，然后画出最佳拟合线。
You should be able to interpret trends such as directly proportional, inversely proportional or no correlation. Calculating gradients and using tangent lines for curves can be required for higher progress.
你应该能够解释趋势，如正比、反比或无相关性。更高阶段可能需要计算斜率和在曲线上使用切线。
Tables must have headings with units, values to an appropriate number of significant figures and a clear layout. Record all observations carefully, noting colour changes, gas evolution or temperature readings.
表格必须有带单位的表头，数值取适当有效数字，且布局清晰。仔细记录所有观察结果，注意颜色变化、气体逸出或温度读数。
Laboratory safety is paramount. Standard hazard symbols (flammable, corrosive, oxidising, irritant, toxic, environmental hazard) must be recognised. Always wear safety goggles, tie back long hair and follow the CLEAPSS student safety sheets or Hazcards for each chemical.
实验室安全至关重要。必须识别标准危险标志（易燃、腐蚀性、助燃、刺激性、有毒、环境危害）。始终佩戴护目镜，束起长发，并遵循针对每种化学品的 CLEAPSS 学生安全资料表或 Hazcard。
When planning an investigation, identify the independent, dependent and control variables. Control variables must be kept the same to ensure a fair test. Repeating measurements increases reliability and spotting anomalous results helps evaluate the procedure.
设计探究实验时，确定自变量、因变量和控制变量。控制变量必须保持相同以确保公平测试。重复测量可提高可靠性，发现异常结果有助于评估实验程序。
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