📚 Core Knowledge Points for Year 10 SQA Chemistry | Year 10 SQA 化学：核心知识点梳理
This article summarises the core knowledge required for Year 10 SQA Chemistry, covering fundamental topics from atomic structure to chemical analysis. It is designed to help students build a solid foundation and prepare for their assessments.
本文梳理了 Year 10 SQA 化学的核心知识点，涵盖从原子结构到化学分析的基础主题，旨在帮助学生打牢基础，为测评做好准备。
1. Atomic Structure and the Periodic Table | 原子结构与元素周期表
Every atom contains a nucleus made of protons and neutrons, surrounded by electrons in energy levels. The number of protons (atomic number) determines the identity of the element. The mass number is the sum of protons and neutrons. Atoms are neutral because protons and electrons are equal in number.
每个原子都有一个由质子和中子组成的原子核，核外电子分层排布。质子数（原子序数）决定了元素的种类。质量数是质子数与中子数之和。原子呈电中性，因为质子数与电子数相等。
Electron arrangement follows the pattern 2, 8, 8, ... for the first three shells. Elements in the same group have the same number of outer electrons, leading to similar chemical properties. The periodic table is arranged by increasing atomic number, with periods corresponding to the number of electron shells.
电子排布遵循 2,8,8,… 的规律（前三层）。同一族的元素最外层电子数相同，因此化学性质相似。元素周期表按原子序数递增排列，周期数等于电子层数。
2. Bonding: Ionic, Covalent and Metallic | 化学键：离子键、共价键与金属键
Ionic bonding occurs between a metal and a non-metal. Metals lose electrons to form positive ions (cations), while non-metals gain electrons to form negative ions (anions). The electrostatic attraction between oppositely charged ions holds the lattice together, e.g. in sodium chloride (NaCl).
离子键形成于金属与非金属之间。金属失去电子形成阳离子，非金属得到电子形成阴离子。带相反电荷的离子通过静电引力构成离子晶格，例如氯化钠 (NaCl)。
Covalent bonding occurs when two non-metal atoms share one or more pairs of electrons to achieve a full outer shell. Molecules like water (H₂O) and carbon dioxide (CO₂) are formed this way. Some covalent substances form giant structures, such as diamond and silicon dioxide.
共价键是两个非金属原子通过共用一对或多对电子以达到稳定电子层结构而形成的。水 (H₂O) 和二氧化碳 (CO₂) 等分子就是这样构成的。一些共价物质可形成巨型结构，如金刚石和二氧化硅。
Metallic bonding features a lattice of positive metal ions surrounded by a 'sea' of delocalised electrons. This model explains why metals conduct electricity, are malleable and have high melting points.
金属键的特点是金属阳离子规则排列在“电子海”中，离域电子自由移动。这解释了金属的导电性、延展性和高熔点。
3. Writing Chemical Formulae and Equations | 化学式与化学方程式的书写
Chemical formulae are written using the chemical symbols and subscripts to show the number of each atom in a compound. When writing ionic formulae, the total positive charge must balance the total negative charge, e.g. aluminium oxide is Al₂O₃ because Al³⁺ and O²⁻ combine in a 2:3 ratio.
化学式用元素符号和下标数字表示化合物中各原子的个数。书写离子式时，正负总电荷需相互平衡，例如氧化铝为 Al₂O₃，因为 Al³⁺ 与 O²⁻ 以 2:3 的比例结合。
A balanced chemical equation shows the relative amounts of reactants and products, obeying the law of conservation of mass. State symbols (s), (l), (g) and (aq) indicate solid, liquid, gas and aqueous solution respectively.
配平的化学方程式表示反应物与生成物的相对数量，遵守质量守恒定律。状态符号 (s)、(l)、(g)、(aq) 分别表示固态、液态、气态和水溶液。
4. The Mole and Reacting Masses | 摩尔与反应质量
or amount of substance. One mole of any substance contains 6.02 × 10²³ particles (Avogadro' ubstance is the mass in grams of one mole, numerically equal to the relative formula mass.
摩尔是物质的量的单位。1 摩尔任何物质含有 6.02 × 10²³ 个粒子（阿伏伽德罗常数）。摩尔质量 (M) 是 1 摩尔物质的质量，数值上等于其相对式量，单位为 g/mol。
cting masses. For example, from a balanced equation, the mole ratio allows us to find the mass of a product given the mass of a reactant.
利用关系式 n = m / M 和 n = c × V（溶液），可计算反应质量。例如，根据配平的化学方程式，利用摩尔比可由反应物质量求出生成物质量。
5. Acids, Bases and the pH Scale | 酸、碱与 pH 标度
An acid is a substance that produces hydrogen ions (H⁺) in water. Common acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃). A base is a substance that neutralises an acid to form a salt and water; an alkali is a soluble base that releases hydroxide ions (OH⁻) in water, such as sodium hydroxide (NaOH).
酸是在水中能产生氢离子 (H⁺) 的物质。常见酸有盐酸 (HCl)、硫酸 (H₂SO₄) 和硝酸 (HNO₃)。碱能中和酸生成盐和水；可溶性的碱称为碱，在水中释放氢氧根离子 (OH⁻)，如氢氧化钠 (NaOH)。
alkaline. Neutralisation is the reaction between H⁺ and OH⁻ to form water: H⁺ + OH⁻ → H₂O.
pH 标度用于衡量酸碱度：pH<7 为酸性，pH=7 为中性，pH>7 为碱性。中和反应是 H⁺ 与 OH⁻ 结合生成水：H⁺ + OH⁻ → H₂O。
Writing neutralisation equations, for example: HCl + NaOH → NaCl + H₂O.
例如书写中和方程式：HCl + NaOH → NaCl + H₂O。
6. Rates of Reaction | 反应速率
The rate of a reaction measures how quickly reactants are consumed or products are formed. Factors that affect rate include temperature, concentration (for solutions), surface area (for solids) and the use of a catalyst.
反应速率衡量反应物消耗或生成物产生的快慢。影响速率的因素包括温度、浓度（溶液）、表面积（固体）以及催化剂。
According to collision theory, particles must collide with sufficient energy (activation energy) and correct orientation for a reaction to occur. Increasing temperature gives particles more kinetic energy, increasing both collision frequency and the proportion of successful collisions. A catalyst provides an alternative pathway with a lower activation energy, without being used up.
根据碰撞理论，粒子必须发生有效碰撞（能量超过活化能且取向合适）才能发生反应。升高温度增加粒子动能，提高碰撞频率和有效碰撞比例。催化剂提供较低活化能的新路径，自身不被消耗。
The average rate of reaction can be calculated as change in quantity ÷ change in time, often measured by gas volume produced per minute or change in mass.
平均反应速率可用变化量 ÷ 变化时间计算，通常以每分钟产生气体体积或质量变化来测量。
7. Electrolysis and Extraction of Metals | 电解与金属提取
Electrolysis is the decomposition of an ionic compound using direct current electricity. The compound must be molten or dissolved in water so ions are free to move. Positive ions migrate to the negative electrode (cathode) and gain electrons (reduction), while negative ions migrate to the positive electrode (anode) and lose electrons (oxidation).
电解是用直流电将离子化合物分解的过程。电解质必须熔融或溶于水，使离子能自由移动。阳离子移向负极（阴极）得电子（还原），阴离子移向正极（阳极）失电子（氧化）。
bBr₂(l) → Pb(l) + Br₂(g). At the cathode: Pb²⁺ + 2e⁻ → Pb. At the anode: 2Br⁻ → Br₂ + 2e⁻.
例如，电解熔融溴化铅：PbBr₂(l) → Pb(l) + Br₂(g)。阴极：Pb²⁺ + 2e⁻ → Pb；阳极：2Br⁻ → Br₂ + 2e⁻。
Reactive metals like aluminium are extracted from their ores using electrolysis, while less reactive metals can be obtained by reduction with carbon.
活泼金属（如铝）通过电解其矿石提取；不太活泼的金属可用碳还原。
8. Hydrocarbons and Fuels | 碳氢化合物与燃料
Hydrocarbons are compounds containing only carbon and hydrogen. Alkanes are a homologous series with the general formula CₙH₂ₙ₊₂. The first four alkanes are methane (CH₄), ethane (C₂H₆), propane (C₃H₈) and butane (C₄H₁₀). They are saturated because they contain only single bonds.
碳氢化合物只含碳和氢。烷烃是一个同系物系列，通式为 CₙH₂ₙ₊₂。前四种烷烃是甲烷 (CH₄)、乙烷 (C₂H₆)、丙烷 (C₃H₈) 和丁烷 (C₄H₁₀)。它们因只含单键而被称为饱和烃。
ncomplete combustion can produce carbon monoxide (CO), a poisonous gas, and soot (carbon).
碳氢化合物完全燃烧生成二氧化碳和水，例如甲烷燃烧：CH₄ + 2O₂ → CO₂ + 2H₂O。不完全燃烧会产生有毒的一氧化碳 (CO) 和碳黑。
Crude oil is separated into fractions by fractional distillation based on boiling point ranges.
原油通过分馏按沸点范围分离成不同馏分。
9. Energy Changes in Reactions | 化学反应中的能量变化
Chemical reactions can be exothermic (release energy to the surroundings, temperature increases) or endothermic (absorb energy, temperature decreases). Bond breaking requires energy (endothermic), and bond making releases energy (exothermic).
化学反应可分为放热反应（向周围释放能量，温度升高）和吸热反应（吸收能量，温度降低）。化学键断裂吸收能量（吸热），化学键形成释放能量（放热）。
mate overall ΔH: ΔH = Σ(bond energies of bonds broken) − Σ(bond energies of bonds formed).
放热反应的焓变 (ΔH) 为负，吸热反应的焓变为正。利用键能可估算反应热：ΔH = 反应物键能总和
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