📚 Cambridge IGCSE Exam Questions from Paper 3 | 剑桥IGCSE化学试卷三考题解析
Cambridge IGCSE Chemistry Paper 3 (Extended Theory) is a structured written examination that tests your depth of understanding across the entire syllabus. Unlike Paper 1 or Paper 2 multiple choice papers, Paper 3 requires you to construct your own answers, balance equations, perform calculations, and explain chemical phenomena in your own words. Mastering this paper is the single most decisive step towards achieving an A* grade.
剑桥IGCSE化学试卷三（拓展理论）是一份结构化笔试，考查你对整个教学大纲的理解深度。与试卷一或试卷二的选择题不同，试卷三要求你自行组织答案、配平方程式、进行计算，并用你自己的语言解释化学现象。掌握这份试卷是迈向A*成绩最关键的一步。
1. Understanding Paper 3 Structure | 试卷三结构解析
Paper 3 lasts for 1 hour 15 minutes and carries 80 marks, worth 50% of your final grade. It is only taken by candidates sitting the Extended curriculum. The paper contains approximately 8 to 12 compulsory structured questions covering all syllabus topics, with marks ranging from 5 to 12 per question.
试卷三考试时长为1小时15分钟，满分80分，占总成绩的50%。只有参加拓展课程的考生才需要考这份试卷。试卷包含大约8到12道必做结构题，覆盖全部大纲主题，每题分值在5到12分之间。
The question booklet provides spaces for your answers; rough work should be done in the booklet and crossed out if not intended for marking. All questions are compulsory, so there is no choice — you must be prepared for every topic.
答题册中为你的答案预留了作答空间；草稿应在答题册中完成，如不打算作为答案请划掉。所有题目均为必做题，没有选择余地——你必须对每个主题都做好准备。
2. Command Words and Question Types | 指令词与题型
Understanding the command word is the first key to scoring marks. ‘State’ or ‘Name’ requires a brief fact; ‘Describe’ asks for what happens; ‘Explain’ demands reasons and mechanisms; ‘Calculate’ requires a numeric answer with units; ‘Suggest’ lets you apply knowledge to a fresh context.
理解指令词是得分的第一把钥匙。”State”（陈述）或”Name”（写出名称）只需要简短事实；”Describe”（描述）要求说明发生了什么；”Explain”（解释）要求给出理由和机理；”Calculate”（计算）需要带单位的数值答案；”Suggest”（建议）让你将知识应用于新的情境。
- State the colour change: one mark, no explanation needed. | 写出颜色变化：1分，无需解释。
- Explain why the rate increases: link temperature to particle kinetic energy and collision frequency. | 解释速率为何增大：联系温度与粒子动能以及碰撞频率。
- Calculate the concentration: show your working, include units, and give the answer to an appropriate number of significant figures. | 计算浓度：写出步骤，包含单位，并保留合适的有效数字。
The most common mistake candidates make is writing too much for a 1-mark ‘state’ question and too little for a 3-mark ‘explain’ question. Match your answer length to the marks allocated.
考生最常见的错误是在1分的”state”题上写太多，而在3分的”explain”题上写太少。答案长度要与分值匹配。
3. Moles and Stoichiometry |
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