📚 Year 10 SQA Chemistry: Core Concepts Review | Year 10 SQA 化学：核心知识点梳理
This article brings together the fundamental topics you will encounter in Year 10 SQA Chemistry. From atomic structure and bonding to organic chemistry and quantitative analysis, each concept is explained with clarity and paired with key vocabulary so you can build confidence in both English and Chinese. Use this as your revision companion to deepen understanding and prepare for internal assessments and the SQA National 5 course.
本文汇总了 Year 10 SQA 化学课程中的核心基础知识。从原子结构与键合，到有机化学和定量分析，每个概念都配有关键词汇的中英对照讲解，帮助你用双语巩固理解，为校内测评和 SQA National 5 课程做好准备。
1. Atomic Structure | 原子结构
Atoms are the smallest particles of an element that still have the chemical properties of that element. The nucleus contains positively charged protons and neutral neutrons, while negatively charged electrons orbit the nucleus in energy levels. The atomic number (Z) is the number of protons and defines the element. The mass number (A) is the total number of protons plus neutrons.
原子是保持元素化学性质的最小粒子。原子核由带正电的质子和不带电的中子组成，带负电的电子则在核外的电子层中运动。原子序数 (Z) 等于质子数，决定了元素的种类；质量数 (A) 则是质子数与中子数的总和。
Electrons are arranged in shells (energy levels), with the first shell holding a maximum of 2 electrons and the second and third shells holding up to 8 electrons each. For elements with atomic numbers 1 to 20, the electron arrangement can be written simply, for example 2.8.1 for sodium (Na). The outermost electrons are called valence electrons and determine chemical reactivity.
电子分层排布，第一层最多容纳 2 个电子，第二、三层最多容纳 8 个电子。1 至 20 号元素的电子排布可以写成简单形式，如钠 (Na) 的排布为 2.8.1。最外层电子称为价电子，决定了元素的化学性质和反应活性。
2. The Periodic Table and Patterns | 周期表与规律
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 the same number of valence electrons and therefore similar chemical properties. For example, all Group 1 elements have one electron in their outer shell and are highly reactive metals.
元素周期表按原子序数递增的顺序排列，每一横行叫做周期，每一纵列叫做族。同族元素拥有相同数目的价电子，因此化学性质相似。例如第 1 族元素最外层都有一个电子，都是非常活泼的金属。
Group 1 metals (alkali metals) react vigorously with water to produce alkaline solutions and hydrogen gas. Group 7 elements (halogens) exist as diatomic molecules, such as F₂, Cl₂, Br₂, I₂, and their reactivity decreases down the group. Group 0 elements (noble gases) have full outer shells, making them very stable and unreactive. A quick way to determine the ion formed by an element is to check how many electrons it needs to lose or gain to reach a full outer shell, like Na losing one electron to become Na⁺.
第 1 族碱金属与水剧烈反应，生成碱性溶液和氢气。第 7 族卤素以双原子分子存在，如 F₂、Cl₂、Br₂、I₂，反应活性从上到下递减。第 0 族稀有气体最外层已满，非常稳定，几乎不参与反应。判断元素形成的离子非常简单：看它需要失去或获得几个电子达到全满结构。例如钠失去一个电子形成 Na⁺。
3. Bonding and Properties | 化学键与物质性质
Atoms bond together to achieve a full outer electron shell. Ionic bonding occurs between metals and non-metals when electrons are transferred. The metal atom loses electrons to become a positive ion (cation), and the non-metal atom gains them to become a negative ion (anion). The strong electrostatic attraction between oppositely charged ions holds the ionic lattice together and gives ionic compounds high melting and boiling points.
原子通过得失或共用电子来使最外层达到稳定结构。金属与非金属之间发生离子键合：金属原子失去电子形成阳离子，非金属原子得到电子形成阴离子。正负离子之间的强静电作用形成了离子晶格，因此离子化合物的熔点和沸点很高。
Covalent bonding occurs between two non-metal atoms that share pairs of electrons. A molecule like water (H₂O) has two single covalent bonds, and carbon dioxide (CO₂) has two double covalent bonds. Covalent molecular substances have low melting points and do not conduct electricity. Covalent networks, such as diamond and silicon dioxide, have giant lattice structures and very high melting points. Metallic bonding features a lattice of positive ions surrounded by a 'sea' of delocalised electrons, which explains why metals are good conductors of heat and electricity and can be shaped easily.
两个非金属原子之间通过共用电子对形成共价键。如水分子 (H₂O) 含有两个单键，二氧化碳 (CO₂) 含有两个双键。共价分子物质熔点低，不导电。而像金刚石、二氧化硅这类共价网络具有巨型结构，熔沸点极高。金属键的模型是阳离子被离域电子“海洋”包围，因此金属具有良好的导电、导热性和延展性。
4. Chemical Formulae and Equations | 化学式与化学方程式
A chemical formula shows the types and numbers of atoms in a compound. For ionic compounds, the overall charge must be zero, so we use cross-over of charges to get the correct formula. For example, aluminium oxide contains Al³⁺ and O²⁻, giving the formula Al₂O₃. For covalent molecular substances, prefixes like mono-, di-, tri- are often used, e.g. carbon tetrachloride CCl₄.
化学式表示化合物中原子的种类和个数。写离子化合物的化学式时要确保总电荷为零，可以用交换电荷值的方法。例如氧化铝由 Al³⁺ 和 O²⁻ 组成，化学式为 Al₂O₃。共价分子化合物常用一、二、三等前缀表示原子数，如四氯化碳 CCl₄。
Chemical equations show the reactants and products in a reaction. A balanced equation has the same number of each type of atom on both sides. For instance, the combustion of methane is:
CH₄ + 2O₂ → CO₂ + 2H₂O
化学方程式表示反应物和生成物。配平后，方程式两边每种原子的总数必须相等。例如甲烷燃烧的方程式为：
CH₄ + 2O₂ → CO₂ + 2H₂O
State symbols (s), (l), (g) and (aq) can be added to show the physical state or aqueous solution. Equations can also be written as ionic equations, where spectator ions that do not change are omitted, leaving only the reacting ions.
方程式可以加上状态符号 (s)、(l)、(g)、(aq) 表明固态、液态、气态或水溶液。还可以写成离子方程式，去掉不参与反应的旁观离子，只保留实际反应的离子。
5. The Mole Concept | 摩尔概念
or amount of substance. One mole of any substance contains 6.02 × 10²³ particles (Avogadro' the formula mass of water H₂O is (2×1) + 16 = 18, so one mole of water has a mass of 18 g.
摩尔是表示物质的量的单位。1 摩尔任何物质含有阿伏伽德罗常数 (6.02 × 10²³) 个微粒。1 摩尔物质的质量（克）在数值上等于该物质的式量。例如水的式量为 (2×1) + 16 = 18，因此 1 摩尔水的质量是 18 克。
Key formulas to remember:
n = m / M
c = n / V
where n is the number of moles, m is the mass in grams, M is the molar mass, c is concentration in mol/L, and V is the volume of solution in litres. For gases at the same temperature and pressure, equal moles occupy equal volumes. The molar volume is often taken as 22.4 L at standard conditions, but SQA may use data from questions; the ratio method is equally important.
需要掌握的重要公式：
n = m / M
c = n / V
其中 n 是物质的量（摩尔），m 是质量（克），M 是摩尔质量，c 是浓度（mol/L），V 是溶液体积（升）。对于气体，相同条件下等物质的量的气体占据相同体积，通常可运用题目给出的数据或体积比进行计算。
6. Acids, Bases and pH | 酸、碱与 pH
Acids are substances that produce hydrogen ions (H⁺) when dissolved in water. Common laboratory acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃). Bases are substances that neutralise acids, and alkalis are soluble bases that produce hydroxide ions (OH⁻) in water.
酸是溶于水时产生氢离子 (H⁺) 的物质。实验室常用的酸有盐酸 (HCl)、硫酸 (H₂SO₄) 和硝酸 (HNO₃)。碱能中和酸，可溶性的碱称为碱（alkalis），它们在水中产生氢氧根离子 (OH⁻)。
The pH scale ranges from 0 to 14. Acids have pH less than 7, alkalis have pH greater than 7, and pure water has a pH of 7. During neutralisation, H⁺ ions from the acid react with OH⁻ ions from the alkali to form water:
H⁺(aq) + OH⁻(aq) → H₂O(l)
pH 范围从 0 到 14，酸性溶液 pH < 7，碱性溶液 pH > 7，纯水 pH = 7。中和反应的本质是酸中的 H⁺ 与碱中的 OH⁻ 结合生成水：
H⁺(aq) + OH⁻(aq) → H₂O(l)
Non-metal oxides such as CO₂ and SO₂ produce acidic solutions in water, while metal oxides such as Na₂O and CaO are basic. Spectator ions are those that do not change during a reaction; in a titration between HCl and NaOH, Cl⁻ and Na⁺ are spectator ions.
非金属氧化物如 CO₂、SO₂ 溶于水形成酸性溶液；金属氧化物如 Na₂O、CaO 则呈碱性。旁观离子是反应前后没有变化的离子，例如 HCl 与 NaOH 滴定中的 Cl⁻ 和 Na⁺。
7. Electrochemistry: Cells and Electrolysis | 电化学：电池与电解
When a more reactive metal is placed in a solution of a less reactive metal ion, a displacement reaction occurs. For example, zinc added to copper(II) sulfate solution displaces copper:
Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)
将较活泼的金属放入较不活泼金属的盐溶液中，会发生置换反应。例如锌加入硫酸铜溶液中，铜被置换出来：
Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)
In a simple cell, two different metals are connected by a wire and placed in an electrolyte. The greater the difference in reactivity, the larger the voltage produced. The electrochemical series lists metals in order of their tendency to lose electrons, and it helps predict the direction of electron flow and cell voltage.
简单电池由两种不同金属通过导线连接并浸入电解质中制成。金属间活泼性差异越大，产生的电压越高。电化学序按金属失去电子的倾向排序，可用来判断电流方向和电压大小。
Electrolysis is the breakdown of an ionic compound using direct current. In the electrolysis of molten lead(II) bromide, lead forms at the cathode and bromine at the anode. In aqueous solutions, water can also be electrolysed, so the product depends on the relative reactivity of the ions. For example, electrolysis of sodium chloride solution produces hydrogen gas at the cathode and chlorine gas at the anode, leaving sodium hydroxide in solution.
电解是利用直流电分解离子化合物。电解熔融溴化铅时，阴极生成铅，阳极生成溴。在水溶液中，水自身也可能参与电解，产物取决于离子的放电难易。例如电解氯化钠溶液时，阴极产生氢气，阳极产生氯气，溶液中留下氢氧化钠。
8. Fuels and Hydrocarbons | 燃料与烃类
Crude oil is a mixture of hydrocarbons that can be separated by fractional distillation. Hydrocarbons are compounds containing only carbon and hydrogen. The alkanes are a homologous series with the general formula CₙH₂ₙ₊₂. They are saturated compounds because they contain only single C–C bonds. The first four straight-chain alkanes are methane (CH₄), ethane (C₂H₆), propane (C₃H₈) and butane (C₄H₁₀).
原油是烃类的混合物，可通过分馏进行分离。烃是只含碳和氢的化合物。烷烃是通式为 CₙH₂ₙ₊₂ 的同系列有机物，它们只含碳碳单键，属于饱和烃。前四种直链烷烃是甲烷 (CH₄)、乙烷 (C₂H₆)、丙烷 (C₃H₈) 和丁烷 (C₄H₁₀)。
Alkenes contain at least one carbon-carbon double bond and are unsaturated. Their general formula is CₙH₂ₙ. Ethene (C₂H₄) is the simplest alkene. Unsaturated hydrocarbons decolourise bromine water quickly, which is a test for unsaturation. Cracking is a process that breaks long-chain alkanes into smaller alkanes and alkenes, which are more useful as fuels and chemical feedstocks.
烯烃含有至少一个碳碳双键，属于不饱和烃，通式为 CₙH₂ₙ。最简单的烯烃是乙烯 (C₂H₄)。不饱和烃能使溴水迅速褪色，这是检验不饱和键的方法。裂化将长链烷烃断裂成更短的烷烃和烯烃，小分子更适合用作燃料和化工原料。
Complete combustion of hydrocarbons in excess oxygen produces carbon dioxide and water, while incomplete combustion yields carbon monoxide or carbon (soot). Understanding the balanced equations for combustion is important for energy calculations and pollution discussions.
烃类在充足氧气中完全燃烧生成二氧化碳和水，不完全燃烧则产生一氧化碳或碳。掌握燃烧反应的配平方程式对能量计算和讨论空气污染都至关重要。
9. Alcohols and Carboxylic Acids | 醇与羧酸
Alcohols are another homologous series, containing the functional group –OH (hydroxyl). The general formula for straight-chain alcohols is CₙH₂ₙ₊₁OH. Methanol (CH₃OH) and ethanol (C₂H₅OH) are the first two members. Ethanol is widely used as a solvent and in alcoholic drinks. Alcohols are soluble in water and can be oxidised to carboxylic acids.
醇是含有羟基 (–OH) 官能团的同系列有机物，直链醇的通式为 CₙH₂ₙ₊₁OH。甲醇 (CH₃OH) 和乙醇 (C₂H₅OH) 是前两种醇。乙醇常用作溶剂和酒精饮料的成分。醇可溶于水，也可被氧化为羧酸。
Carboxylic acids contain the functional group –COOH. The first member is methanoic acid (HCOOH), followed by ethanoic acid (CH₃COOH). Vinegar is a dilute solution of ethanoic acid. Carboxylic acids are weak acids and react with alcohols in the presence of a strong acid catalyst to form esters. Esters often have pleasant fruity smells and are used in flavourings and fragrances.
羧酸含有 –COOH 官能团。甲酸 (HCOOH) 和乙酸 (CH₃COOH) 是最简单的两种羧酸。食醋是乙酸的稀溶液。羧酸属于弱酸，能在强酸催化下与醇反应生成酯。酯类化合物通常具有水果香味，常用于香料和调香。
In the lab, the reaction of ethanol with ethanoic acid produces ethyl ethanoate, an important ester. The reversible nature of the reaction and characteristic smell make it a common practical investigation in Year 10.
在实验室中，乙醇与乙酸反应生成乙酸乙酯，这是一种重要的酯。反应的可逆性和其特征香味使其成为 Year 10 常见的实验研究内容。
10. Chemical Analysis Techniques | 化学分析方法
rette adds the other solution until the indicator changes colour at the end point. Repeating the titration yields concordant results, and calculations then use c₁V₁ = c₂V₂ or the mole method.
滴定是一种定量分析技术，用来测定酸或碱的浓度。用移液管量取一定体积的一种溶液，再用滴定管滴加另一种溶液，直到指示剂在终点变色。重复滴定得到一致的结果，然后用 c₁V₁ = c₂V₂ 或摩尔法进行计算。
Chromatography is a technique for separating mixtures into their components. Paper chromatography uses a stationary phase (paper) and a mobile phase (solvent). The substances travel different distances depending on their solubility and attraction to the paper. By comparing Rf values (distance moved by substance divided by distance moved by solvent), mixture components can be identified.
色谱法用来分离混合物中的各组分。纸色谱的固定相是色谱纸，流动相是溶剂。因各物质溶解度及对纸张的吸附力不同，移动距离也不同。通过比较比移值 Rf（物质移动距离 / 溶剂移动距离），可以鉴定混合物中的成分。
Flame emission spectroscopy is a more advanced analytical method that can identify metal ions by the specific wavelengths of light they emit when heated in a flame. In Year 10, simple flame tests for cations such as Na⁺ (yellow), K⁺ (lilac), Ca²⁺ (orange-red) and Cu²⁺ (blue-green) are often used. Precipitation reactions also help identify anions, for example adding barium chloride to detect sulfate ions gives a white precipitate of BaSO₄.
火焰发射光谱是更高级的分析手段，可根据金属离子在火焰中发出特定波长的光来鉴定离子。Year 10 阶段主要学习简单的焰色反应：Na⁺ 黄色，K⁺ 浅紫色，Ca²⁺ 砖红色，Cu²⁺ 蓝绿色。沉淀反应也可用于检验阴离子，例如加入氯化钡检验硫酸根离子，会产生硫酸钡白色沉淀。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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