📚 GCSE Chemistry: Last-Minute Revision Notes | GCSE化学：考前冲刺笔记
This last-minute revision guide distils the most essential GCSE Chemistry topics into a clear, condensed format. From atomic structure to using resources, every key concept, equation, and common trap is covered so you can review efficiently and walk into your exam with confidence.
这份考前冲刺笔记将最核心的GCSE化学主题浓缩为清晰简洁的格式。从原子结构到资源利用，每个关键概念、重要方程式和常见易错点都涵盖在内，帮助你高效复习，自信迎考。
1. Atomic Structure & the Periodic Table | 原子结构与周期表
All matter is made of atoms. An atom contains a tiny, dense nucleus of protons and neutrons, surrounded by electrons arranged in shells. The atomic number (proton number) defines the element, while the mass number is the total of protons and neutrons.
所有物质都由原子构成。原子中心有一个微小致密的原子核，由质子和中子组成，核外电子按电子层排布。原子序数（质子数）决定了元素种类，质量数则是质子与中子数之和。
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. For example, carbon-12 and carbon-14 are both carbon but have different mass numbers.
同位素是质子数相同但中子数不同的同种元素的原子。例如碳-12和碳-14都是碳，但质量数不同。
In the periodic table, elements are arranged in order of increasing atomic number. Groups (vertical columns) contain elements with the same number of outer electrons and therefore similar chemical properties. Periods (horizontal rows) show a pattern of increasing proton number and repeating trends in properties.
周期表中元素按原子序数递增排列。族（纵列）里的元素最外层电子数相同，因此化学性质相似。周期（横行）则表现出质子数递增和性质递变的规律。
Group 1 are the alkali metals – highly reactive, soft, react violently with water. Group 7 are the halogens – non-metals that exist as diatomic molecules (F₂, Cl₂, Br₂, I₂) and become less reactive down the group. Group 0 are the noble gases – inert, monatomic, with full outer shells.
第1族是碱金属——非常活泼、质软，与水剧烈反应。第7族是卤素——以双原子分子存在（F₂、Cl₂、Br₂、I₂），从上到下活泼性减弱。第0族是稀有气体——惰性、单原子，具有全满的最外层电子。
Electron configuration: the first shell holds up to 2 electrons, the second and third shells hold up to 8. For GCSE, you should be able to write configurations for the first 20 elements, e.g. sodium: 2,8,1; chlorine: 2,8,7.
电子排布：第一层最多2个电子，第二层和第三层最多8个。GCSE要求能写出前20号元素的电子排布，如钠：2,8,1；氯：2,8,7。
2. Chemical Bonding | 化学键
Ionic bonding occurs between metals and non-metals. Metals lose electrons to form positive ions (cations); non-metals gain electrons to form negative ions (anions). The oppositely charged ions are held together by strong electrostatic forces in a giant ionic lattice.
离子键形成于金属和非金属之间。金属失去电子形成阳离子，非金属得到电子形成阴离子。带有相反电荷的离子通过强静电引力结合成巨型离子晶格。
For example, sodium chloride: Na loses its outer electron to become Na⁺, Cl gains that electron to become Cl⁻. The formula is NaCl because the charges balance in a 1:1 ratio. Magnesium oxide: Mg loses two electrons to form Mg²⁺, O gains two electrons to form O²⁻, so the formula is MgO.
例如氯化钠：钠原子失去最外层电子形成Na⁺，氯原子得到该电子形成Cl⁻。电荷以1:1比例平衡，因此化学式为NaCl。氧化镁：镁失去两个电子形成Mg²⁺，氧得到两个电子形成O²⁻，化学式为MgO。
Covalent bonding occurs between non-metal atoms. Electrons are shared to achieve full outer shells. Simple molecular substances (e.g. H₂O, CO₂, CH₄) have strong covalent bonds within molecules but weak intermolecular forces, so they have low melting and boiling points.
共价键形成于非金属原子之间。原子通过共享电子对来达到满壳层结构。简单分子物质（如H₂O、CO₂、CH₄）分子内共价键很强，但分子间作用力较弱，因此熔点和沸点较低。
Giant covalent structures (e.g. diamond, graphite, silicon dioxide) consist of many atoms linked by covalent bonds in a continuous network. These substances have very high melting points. Graphite is unusual because it conducts electricity and is slippery – due to delocalised electrons between layers.
巨型共价结构（如金刚石、石墨、二氧化硅）由无数个原子通过共价键连续连接而成，熔点和沸点极高。石墨例外，它能导电且具有润滑性，因为层间存在离域电子。
Metallic bonding: metal atoms lose their outer electrons, which become delocalised. A lattice of positive ions is surrounded by a ‘sea’ of delocalised electrons, enabling metals to conduct electricity and be malleable.
金属键：金属原子失去最外层电子，这些电子成为离域电子。正离子晶格沉浸在离域电子的“海洋”中，使金属能够导电并具有延展性。
3. Quantitative Chemistry (Moles) | 定量化学（摩尔计算）
The mole is the unit for the amount of substance. One mole of any substance contains 6.02 × 10²³ particles (Avogadro’s constant). The mass of one mole of a substance is its relative formula mass in grams.
摩尔是物质的量的单位。1摩尔任何物质含有6.02×10²³个微粒（阿伏加德罗常数）。1摩尔物质的质量在数值上等于其相对化学式量，单位为克。
moles = mass (g) / molar mass (g/mol)
摩尔数 = 质量(g) / 摩尔质量(g/mol)
To calculate the mass of a product from a given mass of reactant: write the balanced equation, find the moles of the known substance, use the mole ratio to find moles of the unknown, then convert to mass.
由已知反应物质量计算生成物质量：写出配平的化学方程式，求出已知物质的摩尔数，利用摩尔比求出未知物质的摩尔数，再换算为质量。
Concentration calculations: concentration (g/dm³) = mass (g) / volume (dm³). For titrations, use the equation moles = concentration (mol/dm³) × volume (dm³). Remember to convert cm³ to dm³ by dividing by 1000.
浓度计算：浓度(g/dm³) = 质量(g) / 体积(dm³)。滴定计算中使用：摩尔数 = 浓度(mol/dm³) × 体积(dm³)。务必记得将cm³转换为dm³，即除以1000。
Percentage yield compares the actual yield to the theoretical yield: % yield = (actual yield / theoretical yield) × 100. Atom economy is a measure of how efficiently atoms are used: % atom economy = (total Mᵣ of desired product / total Mᵣ of all reactants) × 100.
产率百分比比较实际产量与理论产量：产率% = (实际产量 / 理论产量) × 100。原子经济性衡量原子利用效率：原子经济性% = (目标产物的总相对分子质量 / 所有反应物的总相对分子质量) × 100。
4. Acids, Bases & Salts | 酸、碱和盐
Acids are substances that release hydrogen ions (H⁺) in aqueous solution. Bases neutralise acids to form a salt and water. Alkalis are soluble bases that release hydroxide ions (OH⁻) in water.
酸是在水溶液中能释放氢离子(H⁺)的物质。碱能中和酸生成盐和水。可溶性碱在水中释放氢氧根离子(OH⁻)，称为碱溶液。
The pH scale measures acidity or alkalinity: pH 7 is neutral, less than 7 is acidic, greater than 7 is alkaline. Universal indicator gives a broad colour range; litmus is red in acid and blue in alkali.
pH标度衡量酸碱度：pH=7为中性，小于7为酸性，大于7为碱性。通用指示剂呈现广泛颜色变化；石蕊在酸性中呈红色，在碱性中呈蓝色。
General neutralisation reaction: acid + base → salt + water. With metals, acid + metal → salt + hydrogen. With carbonates, acid + carbonate → salt + water + carbon dioxide.
一般中和反应：酸 + 碱 → 盐 + 水。金属与酸：酸 + 金属 → 盐 + 氢气。碳酸盐与酸：酸 + 碳酸盐 → 盐 + 水 + 二氧化碳。
Making soluble salts: use an excess of insoluble base or carbonate, filter off the excess, and crystallise the salt from the solution. Titration is used when preparing a salt from an alkali and an acid, using an indicator to find the exact end point.
可溶性盐的制备：用过量的不溶性碱或碳酸盐反应，滤去过量物，从溶液中结晶得到盐。当用可溶性碱和酸制备盐时，可使用滴定法，借助指示剂确定恰好中和的终点。
Common strong acids: hydrochloric acid HCl, sulfuric acid H₂SO₄, nitric acid HNO₃. Common alkalis: sodium hydroxide NaOH, potassium hydroxide KOH. The salt formed depends on the acid and metal: hydrochloric acid produces chlorides, sulfuric acid produces sulfates.
常见强酸：盐酸HCl、硫酸H₂SO₄、硝酸HNO₃。常见碱：氢氧化钠NaOH、氢氧化钾KOH。生成的盐取决于所用的酸和金属：盐酸生成氯化物，硫酸生成硫酸盐。
5. Electrolysis | 电解
Electrolysis is the decomposition of an ionic compound using direct current electricity. The electrolyte is the molten or dissolved ionic substance. Positive ions (cations) move to the negative cathode and gain electrons (reduction). Negative ions (anions) move to the positive anode and lose electrons (oxidation).
电解是利用直流电分解离子化合物的过程。电解质是熔融或溶解状态的离子化合物。阳离子移向负极（阴极）得到电子（还原反应），阴离子移向正极（阳极）失去电子（氧化反应）。
In molten lead bromide, Pb²⁺ ions are reduced to lead metal at the cathode, and Br⁻ ions are oxidised to bromine gas at the anode: cathode: Pb²⁺ + 2e⁻ → Pb; anode: 2Br⁻ → Br₂ + 2e⁻.
在熔融溴化铅中，Pb²⁺在阴极还原为金属铅，Br⁻在阳极氧化为溴气：阴极：Pb²⁺ + 2e⁻ → Pb；阳极：2Br⁻ → Br₂ + 2e⁻。
In aqueous solutions, the products depend on the reactivity of the ions. At the cathode, if the metal is less reactive than hydrogen (e.g. Cu²⁺), the metal is formed; if more reactive (e.g. Na⁺), hydrogen gas is produced. At the anode, halide ions are preferentially discharged over oxygen, so chlorine, bromine or iodine may form; otherwise oxygen is released.
在水溶液中，电解产物取决于离子的活泼性顺序。阴极上，若金属比氢不活泼（如Cu²⁺），则析出金属；若比氢活泼（如Na⁺），则产生氢气。阳极上，卤离子优先于OH⁻放电，因此可能生成氯气、溴气或碘气；否则析出氧气。
Electrolysis has important industrial applications: extraction of aluminium from aluminium oxide (in molten cryolite), purification of copper, and production of sodium hydroxide and chlorine from brine.
电解具有重要的工业应用：从氧化铝中提取铝（在熔融冰晶石中进行）、精炼铜，以及从食盐水中生产氢氧化钠和氯气。
6. Energy Changes | 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 from the surroundings, causing a drop in temperature (e.g. thermal decomposition, photosynthesis).
化学反应伴随能量转移。放热反应向环境释放能量，导致温度升高（如燃烧、中和反应）。吸热反应从环境吸收能量，导致温度降低（如热分解、光合作用）。
Bond breaking is endothermic (requires energy); bond making is exothermic (releases energy). In a reaction, if the energy released by forming new bonds is greater than the energy absorbed to break bonds, the reaction is exothermic overall.
断键吸热，成键放热。在一个反应中，如果形成新键释放的能量大于断裂旧键吸收的能量，则整个反应为放热反应。
ΔH = total energy for bond breaking – total energy for bond making
ΔH = 断键总吸能 – 成键总放能
Energy profile diagrams show the relative energies of reactants and products. Activation energy is the minimum energy needed for a reaction to occur. Catalysts lower the activation energy, providing an alternative reaction pathway with lower energy requirements.
能级图显示反应物与生成物的相对能量。活化能是反应发生所需的最低能量。催化剂能降低活化能，提供一条能量要求更低的替代反应路径。
7. Rates of Reaction | 反应速率
The rate of a chemical reaction is the change in concentration of a reactant or product per unit time. It can be measured by the volume of gas produced, change in mass, or formation of a precipitate.
化学反应速率是指单位时间内反应物或生成物浓度的变化。可以通过测量气体产生体积、质量变化或沉淀生成来衡量。
Factors affecting reaction rate: concentration of reactants (higher concentration increases rate in solutions), pressure of gases (higher pressure increases rate), surface area (finely divided solids react faster), temperature (higher temperature increases rate significantly), and catalysts.
影响反应速率的因素：反应物浓度（溶液中浓度越高速率越快）、气体压强（压强越大速率越快）、接触面积（固体越细反应越快）、温度（温度升高速率显著加快）以及催化剂。
Increasing temperature increases the kinetic energy of particles. More particles have energy equal to or greater than the activation energy, so the frequency of successful collisions increases.
升高温度增加了粒子的动能，更多粒子具有等于或大于活化能的能量，因此有效碰撞频率增加。
Collision theory states that for a reaction to occur, particles must collide with sufficient energy (activation energy) and with the correct orientation. Changing the factors above affects the frequency of successful collisions.
碰撞理论认为，要发生反应，粒子必须以足够的能量（活化能）和适当的取向发生碰撞。改变上述因素会影响有效碰撞的频率。
Catalysts are substances that speed up a reaction without being chemically used up. They are specific to reactions and are essential in many industrial processes, such as iron in the Haber process and vanadium(V) oxide in the Contact process.
催化剂是能加快反应速率而自身在过程中没有化学消耗的物质。催化剂对反应具有专一性，在许多工业过程中至关重要，如哈伯法中的铁和接触法中的五氧化二钒。
8. Reversible Reactions & Equilibrium | 可逆反应与平衡
Some reactions are reversible: they can proceed in both directions. The Haber process is a key example: N₂(g) + 3H₂(g) ⇌ 2NH₃(g). The double arrow indicates the reaction is reversible.
有些反应是可逆的，即同时向两个方向进行。哈伯制氨法是一个典型例子：N₂(g) + 3H₂(g) ⇌ 2NH₃(g)。双箭头表示反应可逆。
Dynamic equilibrium is reached when the forward and reverse reactions occur at the same rate in a closed system. The concentrations of reactants and products remain constant, but reactions are still occurring.
动态平衡是指在密闭系统中正向和逆向反应速率相等时的状态。反应物和生成物的浓度保持恒定，但反应仍在持续进行。
Le Chatelier’s principle: if the conditions of a system at equilibrium are changed, the position of equilibrium shifts to oppose the change. Increasing temperature favours the endothermic direction; increasing pressure favours the side with fewer gas molecules.
勒夏特列原理：如果改变平衡系统的条件，平衡位置会向削弱该改变的方向移动。升高温度有利于吸热方向；增大压强有利于气体分子数较少的一方。
For the Haber process (exothermic forward reaction), a low temperature favours a high yield of ammonia but makes the rate too slow. A compromise temperature of about 450°C is used, along with high pressure (200 atm) and an iron catalyst to increase the rate without affecting the equilibrium position.
对于哈伯法（正向放热），低温有利于提高氨的产率，但会使反应速率过慢。工业上采用约450°C的折中温度，配合高压（200大气压）和铁催化剂，既加快速率又不影响平衡位置。
9. Organic Chemistry | 有机化学
Organic chemistry is the study of carbon-based compounds. Hydrocarbons contain only hydrogen and carbon. Alkanes are saturated hydrocarbons with the general formula CₙH₂ₙ₊₂. The first four alkanes are methane (CH₄), ethane (C₂H₆), propane (C₃H₈) and butane (C₄H₁₀).
有机化学研究碳基化合物。烃仅含碳和氢元素。烷烃是饱和烃，通式为CₙH₂ₙ₊₂。前四种烷烃分别为甲烷(CH₄)、乙烷(C₂H₆)、丙烷(C₃H₈)和丁烷(C₄H₁₀)。
Alkenes are unsaturated hydrocarbons containing at least one C=C double bond; general formula CₙH₂ₙ. Ethene (C₂H₄) and propene (C₃H₆) are important examples. The double bond makes alkenes much more reactive than alkanes, undergoing addition reactions.
烯烃是不饱和烃，至少含有一个C=C双键，通式为CₙH₂ₙ。乙烯(C₂H₄)和丙烯(C₃H₆)是重要例子。双键使烯烃比烷烃活泼得多，能发生加成反应。
Addition reactions: alkenes react with hydrogen (hydrogenation), water (hydration to form alcohols), and halogens (e.g. bromine water test – the orange-brown colour is decolourised).
加成反应：烯烃可与氢气（氢化反应）、水（水合反应生成醇）以及卤素（如溴水褪色试验——橙棕色消失）反应。
Alcohols contain the –OH functional group; general formula CₙH₂ₙ₊₁OH. Ethanol (C₂H₅OH) is the most common. It can be produced by fermentation of sugars (with yeast) or by hydration of ethene. Alcohols burn cleanly, dissolve in water, and can be oxidised to carboxylic acids.
醇类含有–OH官能团，通式为CₙH₂ₙ₊₁OH。乙醇(C₂H₅OH)最常见，可通过糖类发酵（用酵母）或乙烯水合制备。醇能完全燃烧、溶于水，并可被氧化为羧酸。
Carboxylic acids contain the –COOH functional group; general formula CₙH₂ₙ₊₁COOH. Ethanoic acid (CH₃COOH) is the acid in vinegar. They react like typical acids but are weak acids. Esters are formed from carboxylic acids and alcohols, used in flavourings and perfumes.
羧酸含有–COOH官能团，通式为CₙH₂ₙ₊₁COOH。乙酸(CH₃COOH)是醋的主要成分。它们表现典型的酸性，但为弱酸。酯由羧酸和醇反应生成，用于食用香料和香水。
Polymers: addition polymers are made from alkene monomers. For example, poly(ethene) is formed from ethene monomers by breaking the double bond. Condensation polymers require two functional groups per monomer, eliminating a small molecule like water, but these are less emphasised at GCSE.
聚合物：加聚物由烯烃单体加成制得，如聚乙烯由乙烯单体通过打开双键聚合而成。缩聚物则需要每个单体带有两个官能团，脱去小分子如水，但在GCSE中要求较浅。
10. Chemical Analysis | 化学分析
Qualitative analysis identifies substances. Flame tests are used for metal ions: lithium (Li⁺) crimson, sodium (Na⁺) yellow, potassium (K⁺) lilac, calcium (Ca²⁺) brick-red, copper (Cu²⁺) green-blue.
定性分析用于鉴定物质。焰色反应可检测金属离子：锂离子(Li⁺)绯红色、钠离子(Na⁺)黄色、钾离子(K⁺)淡紫色、钙离子(Ca²⁺)砖红色、铜离子(Cu²⁺)蓝绿色。
Sodium hydroxide test for metal cations: aluminium (Al³⁺) gives white precipitate soluble in excess; calcium (Ca²⁺) white precipitate insoluble; copper (Cu²⁺) blue precipitate; iron(II) (Fe²⁺) green precipitate; iron(III) (Fe³⁺) brown precipitate.
氢氧化钠法检测阳离子：铝离子(Al³⁺)产生白色沉淀，可溶于过量碱；钙离子(Ca²⁺)白色沉淀不溶；铜离子(Cu²⁺)蓝色沉淀；亚铁离子(Fe²⁺)绿色沉淀；铁离子(Fe³⁺)棕色沉淀。
Anion tests: carbonates (CO₃²⁻) fizz with dilute acid, releasing CO₂ which turns limewater milky. Halides (Cl⁻, Br⁻, I⁻) are tested by adding dilute nitric acid then silver nitrate – chloride gives white ppt, bromide cream ppt, iodide yellow ppt. Sulfates (SO₄²⁻) give a white precipitate with barium chloride in acidic conditions.
阴离子检验：碳酸根离子(CO₃²⁻)加稀酸产生气泡，释放CO₂使石灰水变浑浊。卤离子(Cl⁻、Br⁻、I⁻)检验：加稀硝酸后再加硝酸银溶液，氯离子得白色沉淀，溴离子淡黄色，碘离子黄色。硫酸根离子(SO₄²⁻)在酸性条件下与氯化钡产生白色沉淀。
Gas tests: oxygen relights a glowing splint; hydrogen burns with a ‘squeaky pop’ when a lit splint is applied; carbon dioxide turns limewater milky; chlorine bleaches damp litmus paper.
气体检验：氧气使带火星木条复燃；氢气遇燃着木条发出“噗”的爆鸣声；二氧化碳使石灰水变浑浊；氯气使湿润的蓝色石蕊试纸褪色变白。
11. Chemistry of the Atmosphere & Using Resources | 大气化学与资源利用
The Earth’s early atmosphere was formed by volcanic activity, releasing mainly carbon dioxide, water vapour, and small amounts of methane and ammonia. As the Earth cooled, water vapour condensed to form oceans.
地球早期大气由火山活动形成，主要释放出二氧化碳、水蒸气以及少量甲烷和氨气。随着地球冷却，水蒸气凝结形成了海洋。
The evolution of oxygen came from photosynthesis by algae and plants, which converted CO₂ and water into oxygen over millions of years. Carbon dioxide was locked away in fossil fuels and sedimentary rocks, reducing atmospheric levels.
氧气来源于藻类和植物的光合作用，经过数百万年将二氧化碳和水转化为氧气。二氧化碳被封存在化石燃料和沉积岩中，大气中含量因此降低。
Today’s atmosphere is approximately 78% nitrogen, 21% oxygen, 0.9% argon, and 0.04% carbon dioxide. Human activities such as burning fossil fuels and deforestation are increasing CO₂ levels, leading to climate change.
现今大气成分约为：78%氮气、21%氧气、0.9%氩气、0.04%二氧化碳。燃烧化石燃料和砍伐森林等人类活动正在增加CO₂浓度，导致气候变化。
Common air pollutants from combustion: carbon monoxide (toxic, binds to haemoglobin), sulfur dioxide (acid rain), nitrogen oxides (acid rain and respiratory problems), and particulates (global dimming and health issues).
燃烧产生的常见空气污染物：一氧化碳（有毒，与血红蛋白结合）、二氧化硫（导致酸雨）、氮氧化物（引起酸雨和呼吸系统问题）以及颗粒物（造成全球变暗和健康问题）。
Earth’s resources and sustainable development: using renewable resources, reducing use, reusing and recycling materials. Life Cycle Assessments (LCA) evaluate the environmental impact of a product from raw material extraction to disposal.
地球资源与可持续发展：使用可再生资源、减少用量、重复使用和回收材料。生命周期评估(LCA)评价产品从原料获取到废弃处理的整个生命周期对环境的影响。
Potable water is obtained by treating fresh water (filtration, sterilisation) or desalinating seawater (distillation or reverse osmosis, both energy-intensive). Waste water must be treated to remove organic matter and harmful microbes before release.
饮用水通过处理淡水（过滤、消毒）或海水淡化（蒸馏或反渗透，能耗高）获得。废水在排放前必须经过处理以去除有机物和有害微生物。
12. Common Exam Pitfalls & Key Reminders | 常见考试陷阱与关键提醒
Always use state symbols in equations when asked: (s), (l), (g), (aq). A common mistake is forgetting to balance equations – check the number of atoms of each element on both sides.
题目要求时务必在方程式中标出状态符号：(s)、(l)、(g)、(aq)。常见错误是忘记配平方程式——务必检查两边每种元素的原子数目。
Do not confuse intermolecular forces with covalent bonds. Simple molecules have weak intermolecular forces, not weak bonds. Their low melting points are due to overcoming these weak forces, not breaking covalent bonds.
不要将分子间作用力与共价键混淆。简单分子间的作用力弱，并非化学键弱。熔点低是因为克服了这些弱的分子间力，而不是因为共价键断裂。
In electrolysis of aqueous solutions, students often forget that water also contains H⁺ and OH⁻ ions. Always check the reactivity series for the cathode product and remember the halide preference at the anode.
在电解水溶液时，学生常忘记水中也含有H⁺和OH⁻离子。判断阴极产物时一定要参考金属活动性顺序，牢记阳极卤离子的优先放电次序。
For equilibrium questions, pressure affects only reactions involving gases, and catalysts do not change the position of equilibrium – they only speed up reaching equilibrium.
关于平衡问题，压强只影响有气体参与的反应，催化剂不会改变平衡位置，只能加快到达平衡的速率。
When calculating percentage yield, use moles and the balanced equation to identify the limiting reactant. Percentage yield is always less than 100% due to incomplete reactions, side reactions, and product losses during separation.
计算产率百分比时，要利用摩尔概念和配平方程式找出限量反应物。由于反应不完全、存在副反应以及分离过程中的损失，产率通常低于100%。
In organic nomenclature, the prefix meth-, eth-, prop-, but- correspond to 1, 2, 3, 4 carbons. The suffix -ane is alkane, -ene is alkene, -ol is alcohol, -oic acid is carboxylic acid. Memorise these patterns.
有机命名中，词头甲、乙、丙、丁分别对应1、2、3、4个碳原子。词尾-烷是烷烃，-烯是烯烃，-醇是醇，-酸是羧酸。记住这些规律。
Finally, manage your time: read questions carefully, show all steps in calculations, and always include units. A well-structured answer using correct scientific terminology can make a critical difference.
最后，合理分配时间：仔细审题，计算题写出所有步骤并始终标注单位。使用正确的科学术语、条理清晰作答，会起到关键作用。
Published by TutorHao | Chemistry 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