📚 Year 11 CIE Chemistry: Exam Techniques & Marking Criteria | Year 11 CIE 化学：答题技巧与评分标准
Mastering IGCSE Chemistry is not just about knowing the content—it is about understanding how to apply that knowledge in the exam. This guide will walk you through essential answering techniques and the marking criteria used by CIE examiners, helping you maximise your score.
掌握IGCSE化学不仅仅是记住知识点，更在于理解如何在考试中运用这些知识。本指南将带你了解CIE考官使用的关键答题技巧和评分标准，帮助你在考试中最大化得分。
1. Understand the Exam Structure | 了解考试结构
The CIE IGCSE Chemistry (0620) assessment consists of three papers. All candidates take Paper 2 (Multiple Choice) and Paper 4 (Theory), plus either Paper 5 (Practical Test) or Paper 6 (Alternative to Practical).
CIE IGCSE化学（0620）考核包括三份试卷。所有考生都要参加Paper 2（选择题）和Paper 4（理论题），以及Paper 5（实验操作考试）或Paper 6（实验替代题）。
Paper 2 has 40 multiple-choice questions worth 40 marks, testing breadth of knowledge. You must select one correct answer from four options.
Paper 2包含40道选择题，共40分，考查知识的广度。必须从四个选项中选出一个正确答案。
Paper 4 is the theory paper with short-answer and structured questions, worth 80 marks. It requires detailed explanations, calculations and often tests several topics in one question.
Paper 4是理论卷，包含简答题和结构化问题，共80分。需要给出详细的解释、计算，常在一道题中综合考查多个主题。
Paper 5 tests practical skills in a lab, while Paper 6 assesses understanding of experimental procedures via written questions. Most schools opt for Paper 6, so familiarise yourself with common apparatus, variables and data analysis.
Paper 5在实验室考查实际操作技能，Paper 6则通过书面问题评估对实验过程的理解。大多数学校选择Paper 6，因此要熟悉常见仪器、变量和数据分析。
2. Decode Command Words | 破译指令词
CIE exams use specific command words that tell you exactly what to do. Misinterpreting them can cost marks. The table below lists the most common ones and what examiners expect.
CIE考试使用特定的指令词，明确告诉你应该做什么。误解这些词可能导致失分。下表列出了最常见的指令词及考官的期望。
| Command Word | What It Requires | Tip |
| State | Give a concise answer without explanation. | One word or short phrase. |
| Describe | Say what you see or what happens; no reasons. | Use adjectives, trends, observations. |
| Explain | Give scientific reasons; use 'because'. | Link to theory, particles, bonding. |
| Calculate | Work out a numerical answer; show working. | Include units and significant figures. |
| Suggest | Propose a plausible reason or method (not necessarily the only answer). | Use logic; may not be explicitly taught. |
| Compare | Give similarities and differences. | Use comparative adjectives; e.g., higher, fewer. |
| Deduce | Draw a conclusion from given information. | Use data or patterns in the question. |
A valuable exam technique is to underline or highlight the command word in every question. This forces you to focus on what is actually required and prevents irrelevant answers.
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