KS3 CIE Chemical Reactions Mark Scheme | KS3 CIE 化学反应评分标准

📚 KS3 CIE Chemical Reactions Mark Scheme | KS3 CIE 化学反应评分标准

This article breaks down the KS3 CIE Chemical Reactions mark scheme so you can see exactly where marks are awarded and where candidates often lose them. Use it alongside practice questions to sharpen your exam technique and produce answers that match the wording examiners expect.

本文拆解 KS3 CIE 化学反应评分标准，帮助你明确得分点和常见失分点。配合练习题使用，可以优化答题技巧，写出符合考官要求的答案。

1. Command Words and Mark Allocation | 指令词与分值分配

CIE mark schemes use command words to tell you how to answer. ‘State’ or ‘Name’ requires a short, factual answer with no explanation. ‘Describe’ asks for observations or a sequence of events. ‘Explain’ needs a scientific reason, often using particles or energy. One mark is usually awarded for each correct point, so write more than one point if the question has more than one mark.

CIE 评分标准用指令词提示答题方式。State 或 Name 要求简短的事实性答案，不需要解释。Describe 要求描述观察现象或事件顺序。Explain 需要科学原因，通常涉及粒子或能量。每个正确要点通常得 1 分，因此题目分值超过 1 分时要写出多个要点。

For example, if a question says ‘Describe what you see when magnesium reacts with acid’, the mark scheme lists observable changes such as bubbles forming and the metal disappearing. If it says ‘Explain why mass decreases’, you must link the loss to a gas escaping, not just restate the observation.

例如，如果题目要求描述镁与酸反应时看到什么，评分标准列出可观察的变化，如产生气泡、金属消失。如果题目要求

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