IB化学 Core 计量 原子 键合 能量 备考
IB Core Chemistry covers Topics 1-11, accounting for 80% of your final chemistry grade. Whether you are aiming for a 7 or just want to secure a solid pass, mastering the Core syllabus is non-negotiable. This guide gives you a structured, six-week roadmap through stoichiometry, atomic structure, bonding, energetics, kinetics, equilibrium, acids and bases, redox, organic chemistry, and measurement ： with exam tips, common pitfalls, and a bilingual glossary to lock in key terms.
IB Core化学涵盖Topic 1至11，占化学最终成绩的80%。无论你的目标是7分还是夯实基础，掌握Core内容都是必经之路。本文为你提供一份六周结构化备考路线图，覆盖化学计量、原子结构、化学键、能量学、动力学、平衡、酸碱、氧化还原、有机化学和测量数据处理。同时附上应试策略、常见错误提醒和中英双语术语表，助你锁定高分。
Topic 1 化学计量 Stoichiometric Relationships
The mole concept is the language of chemistry. IB expects you to move fluently between mass, moles, number of particles, gas volume, and solution concentration. Start with the mole triangle: n = m/M, n = V/Vm (for gases at STP: 0degC, 100 kPa, Vm = 22.7 dm3 mol-1), and n = cV (for solutions). From there, empirical and molecular formula calculations are a staple of Paper 1 and Paper 2. Practice limiting reactant problems until you can identify the limiting reagent by inspection ： save time in the exam by comparing the mole ratio of reactants to the balanced equation rather than computing full product yields for both.
摩尔概念是化学的语言。IB要求你在质量、摩尔数、粒子数、气体体积和溶液浓度之间自如转换。从摩尔三角形开始：n = m/M，n = V/Vm（STP下气体：0度、100 kPa、Vm = 22.7 dm3 mol-1），以及 n = cV（溶液）。经验式和分子式计算是Paper 1和Paper 2的常考题型。限速试剂问题要练到能一眼辨认：考试时直接比较反应物的摩尔比与配平方程式，而非费力计算两种反应物的完整产率，可以节省大量时间。
Topic 2-3 原子结构与周期性 Atomic Structure and Periodicity
The progression from Dalton to Thomson to Rutherford to Bohr to the quantum mechanical model is examinable. Know the evidence for each model. For the modern model, be precise: the hydrogen emission spectrum produces convergence at higher energy levels because the energy gaps between successive shells decrease. Ionisation energy trends across Period 3 and down Group 1 demand explanation in terms of nuclear charge, shielding, and atomic radius. The drop from Mg to Al (3p electron, further from nucleus, shielded by 3s) and from P to S (spin-pair repulsion in the 3p orbital) are classic IB mark-scheme points.
从道尔顿到汤姆逊到卢瑟福到玻尔再到量子力学模型，每个模型的证据都可能出现在考卷中。现代模型部分务必精准：氢原子发射光谱在高能级处收敛，因为相邻能级间的能量差逐渐减小。Period 3的电离能趋势和Group 1的变化趋势，必须从核电荷、屏蔽效应和原子半径三方面解释。Mg到Al的电离能下降（3p电子更远，被3s屏蔽）和P到S的下降（3p轨道中自旋电子对排斥）是IB评分标准中的经典考点。
Topic 4 化学键合与结构 Chemical Bonding and Structure
This is the longest topic in the Core and underpins almost everything else. Master the three bond types: ionic (electrostatic attraction between oppositely charged ions in a lattice), covalent (electrostatic attraction between shared electrons and two nuclei), and metallic (electrostatic attraction between a lattice of cations and a sea of delocalised electrons). VSEPR theory gives you shapes: linear, bent, trigonal planar, trigonal pyramidal, tetrahedral. For each shape, you need electron domains, bonding pairs, lone pairs, bond angles, and an example molecule. Intermolecular forces ： London dispersion, dipole-dipole, and hydrogen bonding ： determine physical properties like boiling point and solubility. A common trap: hydrogen bonding occurs only when H is bonded to N, O, or F.
这是Core中最长的章节，也是几乎所有后续内容的基础。掌握三种键型：离子键（晶格中带相反电荷离子之间的静电引力）、共价键（共用电子对与两个原子核之间的静电引力）和金属键（阳离子晶格与离域电子海之间的静电引力）。VSEPR理论给出分子形状：直线形、弯曲形、平面三角形、三角锥形、四面体形。每个形状需要掌握电子域数、成键对数、孤对电子数、键角和一个分子实例。分子间作用力：伦敦色散力、偶极-偶极力和氢键：决定物质的沸点、溶解度等物理性质。常见陷阱：只有当H与N、O或F直接键合时，才存在氢键。
Topic 5 能量学 Energetics
Thermochemistry revolves around enthalpy change (deltaH). The calorimetry calculation q = mc deltaT is the workhorse ： remember that the mass in q = mc deltaT is the mass of the water or solution being heated, not the mass of the reactant. Hess's Law is the unifying problem-solving framework: construct an enthalpy cycle, assign known values, and solve for the unknown. Standard enthalpy of formation (deltaHf standard) is the enthalpy change when one mole of a compound is formed from its elements in their standard states. Standard enthalpy of combustion (deltaHc standard) is the enthalpy change when one mole of a substance is completely burned in excess oxygen. Bond enthalpy calculations (reactants minus products) give approximate deltaH values because average bond enthalpies are used.
热化学围绕焓变展开。量热计算 q = mc deltaT 是核心工具：注意m是水或溶液的质量，而非反应物的质量。赫斯定律是统合性的解题框架：构建焓循环、标出已知值、求解未知数。标准生成焓是1 mol化合物由其标准态元素生成时的焓变。标准燃烧焓是1 mol物质在过量氧气中完全燃烧时的焓变。键焓计算（反应物减生成物）给出近似的deltaH值，因为使用的是平均键焓。
Topic 6 化学动力学 Chemical Kinetics
Collision theory states that for a reaction to occur, particles must collide with the correct orientation and with kinetic energy greater than or equal to the activation energy (Ea). The rate of reaction is measured as the change in concentration of a reactant or product per unit time. Five factors affect rate: concentration (more particles per volume, higher collision frequency), temperature (more particles above Ea, AND higher collision frequency), surface area (more exposed particles can collide), pressure for gases (equivalent to concentration), and catalysts (provide an alternative pathway with lower Ea). Maxwell-Boltzmann distributions appear in every IB exam series ： be able to sketch them and explain the area under the curve beyond Ea.
碰撞理论指出，反应发生的条件是：粒子以正确的取向碰撞，且动能大于或等于活化能(Ea)。反应速率即反应物或生成物浓度在单位时间内的变化。五种影响反应速率的因素：浓度（单位体积粒子数增多，碰撞频率提高）、温度（超过Ea的粒子比例增大，且碰撞频率提高）、表面积（更多粒子暴露可发生碰撞）、气体压强（等同于浓度效应）和催化剂（提供Ea较低的替代反应路径）。麦克斯韦-玻尔兹曼分布曲线是每次IB考试的必考内容：要能画出曲线并解释Ea右侧曲线下面积的含义。
Topic 7-8 平衡与酸碱 Equilibrium and Acids/Bases
Dynamic equilibrium occurs when the rates of the forward and reverse reactions are equal in a closed system. Le Chatelier's principle lets you predict the effect of changes in concentration, pressure, and temperature. For temperature, identify whether the forward reaction is exothermic or endothermic. The equilibrium constant Kc depends only on temperature. For acids and bases, the Bronsted-Lowry theory defines acids as proton donors and bases as proton acceptors. Strong acids and bases fully dissociate; weak acids and bases partially dissociate, establishing an equilibrium. The pH scale is logarithmic: pH = -log10[H+]. Know how to calculate pH for strong acids (direct from concentration), strong bases (via [OH-] and Kw), and weak acids (using Ka = [H+]2 / [HA]).
动态平衡是指密闭体系中正向和逆向反应速率相等的状态。勒夏特列原理帮助你预测浓度、压强和温度变化的影响。温度变化时，需判断正向反应是放热还是吸热。平衡常数Kc仅取决于温度。酸碱方面，Bronsted-Lowry理论将酸定义为质子给体，碱定义为质子受体。强酸和强碱完全电离；弱酸和弱碱部分电离，建立平衡。pH标度是对数标度：pH = -log10[H+]。掌握强酸pH计算（直接从浓度得出）、强碱pH计算（通过[OH-]和Kw）和弱酸pH计算（使用Ka = [H+]2/[HA]）。
Topic 9-10 氧化还原与有机化学 Redox and Organic Chemistry
Oxidation is loss of electrons; reduction is gain of electrons (OIL RIG). Oxidation states let you track electron transfer ： the sum of oxidation states in a neutral compound is zero, and in a polyatomic ion equals the ion's charge. The activity series predicts which metal will displace another from a solution. A voltaic cell converts chemical energy to electrical energy; an electrolytic cell converts electrical energy to chemical energy. For organic chemistry, IB Core covers alkanes, alkenes, alcohols, halogenoalkanes, and their reactions. Learn the functional groups, homologous series patterns, and key reactions: combustion of alkanes, electrophilic addition of alkenes, nucleophilic substitution of halogenoalkanes, and oxidation of alcohols. Isomerism ： structural isomers and stereoisomers ： must be drawn and identified.
氧化是失去电子，还原是得到电子（OIL RIG口诀）。氧化数帮助你追踪电子转移：中性化合物中各原子氧化数之和为零，多原子离子中氧化数之和等于离子的电荷。活动性顺序可预测金属置换反应的产物。原电池将化学能转化为电能；电解池将电能转化为化学能。有机化学方面，IB Core涵盖烷烃、烯烃、醇、卤代烷及其反应。熟记官能团、同系物规律和关键反应：烷烃燃烧、烯烃亲电加成、卤代烷亲核取代、醇的氧化。异构现象：结构异构和立体异构：必须能够绘制和识别。
Topic 11 测量与数据处理 Measurement and Data Processing
This topic runs through the entire course and is assessed in both external and internal assessment. Systematic errors affect accuracy (closeness to the true value); random errors affect precision (spread of repeated measurements). Absolute uncertainty is plus or minus the smallest division on the measuring instrument; percentage uncertainty equals absolute uncertainty divided by measured value times 100. When adding or subtracting measurements, add absolute uncertainties. When multiplying or dividing, add percentage uncertainties. Significant figures reflect the precision of your measurements ： final answers should match the least precise measurement used in the calculation. Be able to calculate mean, standard deviation, and sketch error bars on graphs.
这一章节贯穿整个课程，在外部评估和内部评估中均会考核。系统误差影响准确度（测量值与真值的接近程度）；随机误差影响精密度（重复测量值的离散程度）。绝对不确定度为正负测量仪器最小刻度值；百分比不确定度等于绝对不确定度除以测量值再乘以100。加减运算时，将绝对不确定度相加。乘除运算时，将百分比不确定度相加。有效数字反映测量的精密度：最终答案的有效数字位数应与计算中使用的最不精密的测量值一致。掌握平均值、标准差的计算和图表上误差棒的绘制方法。
六周备考计划 Six-Week Study Plan
Week 1 第一周：Topic 1 + 11 ： Mole concept, stoichiometry, uncertainty, and significant figures. These are the calculation tools you will use in every other topic. Do at least 20 stoichiometry problems with varying difficulty before moving on.
Week 2 第二周：Topic 2 + 3 + 4 ： Atomic structure, periodicity, and bonding. These three topics are tightly linked. Draw ionisation energy graphs from memory. Build a VSEPR shape table with all six shapes, domains, and angles.
Week 3 第三周：Topic 5 + 6 ： Energetics and kinetics. Master Hess's Law cycles. Practice four calorimetry problems. Draw and annotate three Maxwell-Boltzmann curves showing concentration, temperature, and catalyst effects.
Week 4 第四周：Topic 7 + 8 ： Equilibrium and acids/bases. Kc calculations with ICE tables. pH calculations for strong acids, strong bases, and weak acids. Titration curve analysis (equivalence point vs buffer region).
Week 5 第五周：Topic 9 + 10 ： Redox and organic chemistry. Construct and label a voltaic cell diagram. Write half-equations for redox reactions. Draw and name the first six alkanes and alkenes, and their key reaction products.
Week 6 第六周：Consolidation ： Full Paper 1 mock under timed conditions (45 min for 30 questions). Paper 2 mock with Section A (data-based) and Section B (extended response). Review all marked errors and redo weak topics using the bilingual glossary below.
应试技巧与常见错误 Exam Tips and Common Mistakes
Paper 1 Multiple Choice Strategy
30 questions, 45 minutes ： 90 seconds per question. Read the last line of each question first to know what is being asked before processing the stem. Watch for distractors that reverse cause and effect. Bonding and energetics questions often include a calculation disguised as a concept question ： always check the numbers.
30道题，45分钟：每题90秒。先读问题最后一行，明确要求再阅读题干。警惕因果倒置的干扰选项。化学键和能量学题目中，常把计算伪装成概念题：始终检查题中的数字。
Paper 2 Data-Based and Extended Response
Section A always includes a data-based question with an unfamiliar context. The chemistry is just stoichiometry, energetics, or equilibrium dressed in a new scenario ： strip away the context and identify which Core topic is being tested. Section B requires extended answers: define, explain, and apply. Marks are awarded for precise terminology ： "ions" not "particles", "electrostatic attraction" not "force".
Section A总是包含一个陌生情境的数据题。化学本质无非是化学计量、能量学或平衡：剥离情境，识别底层属于哪个Core话题。Section B要求长篇作答：定义、解释、应用。评分关键在用词精准："离子"而非"粒子"，"静电引力"而非"力"。
Top 5 Mistakes 五大常见错误
1. Confusing the mass in q = mc deltaT (it's the solution mass, not the reactant mass) / q=mcΔT中m是溶液质量，不是反应物质量
2. Forgetting that Kc depends only on temperature ： "adding catalyst" does NOT change Kc / 忘记Kc仅取决于温度："加催化剂"不改变Kc
3. Using "< particles >" instead of "< ions >" when describing ionic lattices or electrolysis / 描述离子晶格或电解时错用"粒子"代替"离子"
4. Drawing hydrogen bonds between H and Cl (hydrogen bonding only with N, O, F) / 在H和Cl之间画氢键（氢键仅存在于H与N、O、F之间）
5. Omitting state symbols in thermochemical equations ： marks are deducted / 热化学方程式中遗漏状态符号：会被扣分
内部评估快速指南 IA Quick Guide
The Internal Assessment is worth 20% of your final IB Chemistry grade. Choose a research question that allows you to collect sufficient quantitative data ： a common mistake is picking a topic that sounds interesting but yields only 3-4 data points, making statistical analysis impossible. The four assessment criteria are Personal Engagement (2 marks), Exploration (6 marks), Analysis (6 marks), and Evaluation (6 marks). For Exploration, state a clear hypothesis with scientific justification. For Analysis, include uncertainty propagation and a line of best fit with R-squared. For Evaluation, identify at least three specific limitations and suggest realistic improvements ： not "I would be more careful" but "I would use a data logger with temperature probe sampling every 0.5 seconds to improve the precision of cooling curve measurements."
IA占IB化学最终成绩的20%。选择一个能收集到足够定量数据的研究问题：常见错误是选了一个听起来有趣但只能获得3-4个数据点的话题，导致无法进行统计分析。四项评估标准为：个人投入(2分)、探索(6分)、分析(6分)和评估(6分)。探索部分要提出明确的假设并附上科学依据。分析部分要包含不确定度传播和最佳拟合线及R平方值。评估部分至少指出三个具体局限性并给出切实可行的改进建议：不是"我会更仔细"，而是"我会使用数据采集器配合温度探头，每0.5秒采样一次，以提高冷却曲线测量的精确度"。
中英双语核心术语表 Key Bilingual Terms
mole | 摩尔
Avogadro's constant | 阿伏伽德罗常数
limiting reactant | 限速试剂
empirical formula | 经验式
ionisation energy | 电离能
electronegativity | 电负性
VSEPR theory | 价层电子对互斥理论
intermolecular force | 分子间作用力
enthalpy change | 焓变
Hess's Law | 赫斯定律
activation energy | 活化能
catalyst | 催化剂
dynamic equilibrium | 动态平衡
Le Chatelier's principle | 勒夏特列原理
Bronsted-Lowry acid | Bronsted-Lowry酸
oxidation state | 氧化数
voltaic cell | 原电池
electrolytic cell | 电解池
functional group | 官能团
structural isomer | 结构异构体
systematic error | 系统误差
random error | 随机误差
uncertainty | 不确定度
significant figures | 有效数字
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