📚 Year 10 Cambridge Science: Exam Techniques and Marking Criteria | 剑桥10年级科学：答题技巧与评分标准
Mastering the Cambridge IGCSE Science exams (or equivalent Year 10 assessments) goes beyond knowing the content. It demands a clear understanding of what examiners expect in your answers and how marks are allocated. This guide breaks down essential exam techniques and the marking criteria used for Biology, Chemistry, and Physics papers, helping you turn your knowledge into top marks.
掌握剑桥 IGCSE 科学考试（或与之相当的 10 年级测试）不仅需要掌握知识本身，更需要准确理解考官的评分期望和具体的给分方式。本指南将深入解析适用于生物、化学和物理试卷的核心答题技巧与评分标准，帮你将所学知识转化为最优分数。
1. Understanding Command Words | 理解指令词
Command words such as 'state', 'describe', 'explain', 'calculate', 'compare', and 'evaluate' dictate the type of answer required. Ignoring them is one of the most common reasons students lose marks.
指令词如 "state"、"describe"、"explain"、"calculate"、"compare" 和 "evaluate" 决定了答案的类型。忽视指令词是学生丢分最常见的原因之一。
For instance, a question that says 'State the name of the gas produced' expects only a concise term, e.g., 'oxygen'. Writing a full sentence about how it is produced would waste time and score no extra marks.
例如，一道要求 "说出生成的气体名称" 的题目，期望的答案是简洁的术语，如 "oxygen"。若写出一整句话解释其产生过程，既浪费时间又不会额外得分。
Conversely, 'Explain why the temperature rises' requires a logical chain of reasoning using relevant scientific concepts, not just an observation.
反之，"解释温度升高的原因" 就需要运用相关科学概念进行逻辑推理，而不能仅仅描述观察现象。
Before you start writing, underline the command word and plan what the answer demands: a single word, a labelled diagram, a comparative statement, or a multi-step explanation.
在动笔前，先圈出指令词并思考答案要求：是单个词、带标注的示意图、对比陈述，还是多步骤的解释。
2. Answering 'Describe' Questions | 回答“描述”类问题
'Describe' questions ask you to say what you see or what happens, without providing reasons. In a graph question, you might describe the trend: 'As temperature increases, the volume increases steadily up to 50 °C, then levels off.'
"Describe" 类问题要求你陈述看到的现象或发生的事件，而不需要说明原因。对于图表题，你可能会描述趋势："随着温度升高，体积稳定增加直至 50 °C，然后趋于平稳。"
In experiments, descriptions should include observations like colour changes, gas bubbles, precipitate formation, or thermometer readings. Use precise language: 'a blue precipitate forms' rather than 'it goes blue'.
在实验中，描述应包含观察结果，如颜色变化、气泡产生、沉淀形成或温度计读数。使用精确语言："生成蓝色沉淀"，而不是 "变蓝了"。
When describing a graph, mention both the axes by name, note any turning points, and compare different regions if multiple lines are shown. Always include units from the axis labels.
描述图表时，要指明横纵坐标的名称，标注任何拐点，若有多条曲线还应比较不同区域。始终带上坐标轴上的单位。
Examiners are looking for factual, objective statements. Avoid using vague words like 'good' or 'big'; instead, quantify where possible: 'the mass decreased by 2.3 g'.
考官期待事实性、客观的陈述。避免使用 "好"、"大" 等模糊词汇；尽可能量化，例如 "质量减少了 2.3 g"。
3. Answering 'Explain' Questions | 回答“解释”类问题
'Explain' questions require you to give reasons, usually by linking scientific principles to the context. You must use the words 'because' or 'due to', either explicitly or implicitly. Marks are awarded for each logical step in your reasoning.
"Explain" 类问题要求你给出原因，通常需要将科学原理与题目情境联系起来。你必须明确或暗含 "因为" "由于" 等逻辑关系。推理的每个逻辑步骤都可能获得相应分数。
For example, 'Explain why the rate of reaction increases when the temperature is raised.' An answer should state: 'Particles gain kinetic energy, so they move faster. This leads to more frequent collisions and a greater proportion of collisions with energy greater than the activation energy, resulting in more successful collisions per unit time.'
例如，"解释为何升高温度会使反应速率加快。" 答案应为："粒子获得动能，运动更快，导致碰撞更频繁，且超过活化能的碰撞比例增加，从而单位时间内有效碰撞增多。"
Avoid writing a description
Published by TutorHao | Year 10 Science Revision Series | aleveler.com
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