📚 AQA AS Chemistry Command Words Explained | AQA AS 化学指令词详解
In any AQA International AS Chemistry examination, the command word at the start of a question tells you exactly what the examiner expects in your answer. Misreading or ignoring it is one of the most common reasons students lose easy marks. This guide explains the key command words used in the 9620 specification, what they mean, and how to phrase your response to gain full credit.
在 AQA 国际 AS 化学（9620）考试中，题目开头的指令词明确告诉了你考官希望你在答案中呈现什么。误读或忽视指令词是学生丢失容易得分的最常见原因之一。本指南将解析 9620 考纲中常用的关键指令词、它们的含义，以及如何组织你的答案以获得满分。
1. State / Give / Name | 陈述 / 给出 / 命名
“State”, “Give” and “Name” all require a concise, factual answer. No explanation or working-out is needed unless the question says otherwise. For example, “State the colour of the precipitate when aqueous silver nitrate is added to a solution containing chloride ions” expects just “white”.
“State””Give”和”Name”都要求简洁、事实性的答案。除非题目另有说明，否则不需要解释或计算过程。例如，”State the colour of the precipitate when aqueous silver nitrate is added to a solution containing chloride ions” 只要求回答”white”（白色）。
Common pitfalls: writing too much, adding irrelevant detail, or hedging with words like “maybe”. Be direct and use the correct chemical term.
常见误区：写太多无关内容，或使用”也许”等模棱两可的词汇。要直接给出答案，并使用准确的化学术语。
2. Define | 定义
“Define” asks for a precise scientific statement, often one that has been taught verbatim. For example: “Define the term ‘molar mass’.” You must say the mass of one mole of a substance in grams, with units g mol⁻¹.
“Define”要求精确的科学陈述，通常是课堂上教过的标准定义。例如：”Define the term ‘molar mass’”（定义”摩尔质量”一词）。你需要说明：一摩尔物质的质量，单位为 g mol⁻¹。
Marks are often awarded for key phrases such as “mass of one mole” and “units”. Learn the specification definitions exactly – do not paraphrase.
得分点常常在于关键词组，如”一摩尔物质的质量”和”单位”。请准确记忆考纲中的定义，不要随意改写。
3. Describe | 描述
“Describe” asks you to give an account of what happens, what you observe, or the shape of a trend. It does not ask for reasons. For instance, “Describe the trend in atomic radius across Period 3” – you should say the radius decreases from Na to Ar, but you do not yet need to explain why.
“Describe”要求你描述发生了什么、观察到了什么，或一个趋势的形状，不要求解释原因。例如，”Describe the trend in atomic radius across Period 3″（描述第三周期原子半径的变化趋势）——你应说明从 Na 到 Ar 半径减小，但暂时不需要解释原因。
Use precise language: “increases”, “decreases”, “remains constant”, “then drops sharply”. For experimental procedures, list steps in chronological order with quantities.
使用精确的语言：”增大””减小””保持不变””然后急剧下降”。如果是描述实验步骤，请按时间顺序列出步骤，并包含用量。
4. Explain | 解释
An “Explain” question requires a reason or mechanism, not just a description. A good answer often contains a cause-and-effect chain. For example: “Explain why the first ionisation energy of magnesium is higher than that of sodium.” The answer must link to the greater nuclear charge and smaller atomic radius of Mg.
“Explain”题要求你给出原因或机理，而不仅仅是描述。好的答案通常包含一条因果链。例如：”Explain why the first ionisation energy of magnesium is higher than that of sodium.”（解释镁的第一电离能为什么高于钠。）答案必须联系到 Mg 更大的核电荷和更小的原子半径。
Use connectives such as “because”, “therefore”, “so”. Each mark usually corresponds to one step in the explanation. Write in full sentences.
使用”因为””所以””因此”等连接词。每个得分点通常对应解释中的一个步骤。请用完整句子作答。
5. Suggest | 建议
“Suggest” is used in unfamiliar contexts. You are expected to apply your knowledge of chemistry to a new situation. There is usually more than one correct answer. For example, if told that a new element has a lower melting point than expected, you might “suggest” that it has weaker intermolecular forces.
“Suggest”用于不熟悉的情境。你被期望将化学知识应用到新情境中，通常正确答案不止一个。例如，如果告诉你说一种新元素的熔点比预期低，你可能”suggest”它分子间作用力较弱。
Always base your suggestion on a valid chemical principle (bonding, structure, kinetics, equilibrium). Even if you are unsure, write a plausible mechanism – the examiner rewards reasonable ideas.
始终基于有效的化学原理（成键、结构、动力学、平衡）提出建议。即使不确定，也要写出合理的机理——考官会给合理的想法打分。
6. Calculate | 计算
“Calculate” demands a numerical answer. You must show your working, because method marks are usually available even if the final value is wrong. Always include units and an appropriate number of significant figures. For example:
“Calculate”要求数值答案。你必须展示计算过程，因为即使最终数值错误，通常也有步骤分。始终包含单位并保留适当有效数字。例如：
n(CaCO₃) = mass / M(CaCO₃) = 5.0 g / 100 g mol⁻¹ = 0.050 mol
Use the equation triangle if you are stuck: amount = mass/molar mass. Check that your answer is chemically sensible (e.g. a mole of gas at room temp is about 24 dm³).
如果卡住，可以使用三角公式：物质的量＝质量/摩尔质量。检查你的答案在化学上是否合理（例如室温下 1 mol 气体约为 24 dm³）。
7. Determine / Deduce | 确定 / 推断
“Determine” often means that you need to find a value by calculation, graphical extrapolation, or data analysis. “Deduce” means to draw a logical conclusion from given information. For instance, “Determine the order of reaction with respect to A” or “Deduce the oxidation state of chlorine in ClO₂”.
“Determine”通常表示你需要通过计算、图形外推或数据分析来找到一个值。”Deduce”表示从给定信息中得出逻辑结论。例如，”Determine the order of reaction with respect to A”（确定反应对 A 的反应级数）或”Deduce the oxidation state of chlorine in ClO
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