📚 Year 11 WJEC Science: Essay Writing Framework and Model Answers | WJEC 11年级科学：论文写作框架与范文
In WJEC GCSE Science, extended writing questions (often worth 6 or 9 marks) require you to plan an investigation, present data, draw conclusions, and evaluate methods. This article provides a clear framework for structuring your answers, with a full model answer on how temperature affects reaction rate.
在WJEC GCSE科学考试中，扩展写作题（通常占6或9分）要求你设计实验、呈现数据、得出结论并评价方法。本文提供了一个清晰的写作框架，并附上一篇关于温度如何影响反应速率的完整范文。
1. Understanding WJEC Extended Writing Requirements | 理解WJEC扩展写作要求
Extended writing tasks assess your ability to apply scientific knowledge in a practical context. You may be asked to 'Plan an investigation', 'Analyse the data', or 'Evaluate the method'. Marks are awarded for logical structure, correct use of scientific terms, accurate data handling, and critical evaluation.
扩展写作任务考查你在实验背景下应用科学知识的能力。你可能被要求“设计一项探究”、“分析数据”或“评价方法”。评分依据为逻辑结构、正确使用科学术语、准确的数据处理和批判性评价。
These questions are not simply 'write everything you know'. They test if you can construct a coherent scientific argument. Examiners look for statements linked to evidence, precise language, and awareness of limitations.
这些问题并非简单地“写下你所知道的一切”。它们考查你能否构建连贯的科学论证。考官关注的是与证据相关联的陈述、精准的语言以及对局限性的认识。
2. Analysing the Question and Planning | 审题与规划
Read the question carefully and underline command words such as 'describe', 'explain', 'compare', or 'evaluate'. Spend two minutes drafting a quick plan: aim, variables, method steps, expected results, and a conclusion. This plan will ensure you do not miss key marking points.
仔细阅读题目，在“描述”、“解释”、“比较”或“评价”等指令词下划线。花两分钟快速构思：目的、变量、方法步骤、预期结果和结论。这份提纲能确保你不错过关键得分点。
For example, if asked to investigate the effect of light intensity on photosynthesis, your plan may include: independent variable – distance from lamp; dependent variable – volume of oxygen produced; control variables – CO₂ concentration, temperature, type of plant.
例如，如果要求探究光照强度对光合作用的影响，你的提纲可以包括：自变量——与灯的距离；因变量——产生的氧气体积；控制变量——二氧化碳浓度、温度、植物种类。
3. Introduction: Stating Scientific Principles | 引言：陈述科学原理
Begin your answer with a concise scientific background. Link the investigation to key concepts, such as particle theory, energy transfer, or biological processes. Use precise vocabulary like 'collision frequency', 'activation energy', or 'limiting factor'.
开头简要交代科学背景。将探究与关键概念联系起来，如粒子理论、能量传递或生物过程。使用精准词汇，如“碰撞频率”、“活化能”或“限制因子”。
A strong introduction for a rates experiment might be: 'According to collision theory, for a reaction to occur, particles must collide with sufficient energy (activation energy). Increasing temperature raises the average kinetic energy, so more particles have energy greater than the activation energy, leading to more frequent successful collisions per second.'
一个关于速率实验的有力引言可以是：“根据碰撞理论，要发生反应，粒子必须以足够的能量（活化能）碰撞。升高温度增加了平均动能，因此更多粒子具有大于活化能的能量，导致每秒更多次的成功碰撞。”
4. Method: Describing the Procedure | 方法：描述实验步骤
Write the method in a logical numbered sequence. Include specific volumes, concentrations, and apparatus. State how you will change the independent variable, measure the dependent variable, and keep control variables constant. Always mention safety precautions.
按逻辑顺序编写步骤，编号排列。写明具体的体积、浓度和仪器。说明如何改变自变量、测量因变量以及保持控制变量不变。务必提及安全措施。
Example: '1. Use a measuring cylinder to transfer 20 cm³ of 0.1 mol/dm³ sodium thiosulfate solution into a conical flask. 2. Place the flask on a white tile marked with a cross. 3. Measure 5 cm³ of 1.0 mol/dm³ hydrochloric acid using a separate cylinder. 4. Add the acid to the flask, start the stopwatch, and swirl. 5. Stop the timer when the cross is no longer visible. 6. Repeat at temperatures of 20 °C, 30 °C, 40 °C, 50 °C, using a water bath to control temperature.'
示例：“1. 用量筒量取20 cm³ 0.1 mol/dm³硫代硫酸钠溶液，倒入锥形瓶。2. 将锥形瓶放在画有十字的白瓷砖上。3. 用另一量筒量取5 cm³ 1.0 mol/dm³盐酸。4. 将酸加入锥形瓶，启动秒表并摇匀。5. 当十字不可见时停止计时。6. 分别在20°C、30°C、40°C、50°C温度下重复实验，使用水浴控制温度。”
5. Variables and Control | 变量与控制
Clearly identify the independent variable (the one you change), the dependent variable (the one you measure), and at least three control variables. Explain how you will control each one. This demonstrates a high level of practical understanding.
明确识别自变量（你改变的量）、因变量（你测量的量）和至少三个控制变量。解释如何控制每个变量。这体现出对实验的高度理解。
In the temperature-rate investigation, the independent variable is temperature (°C); the dependent variable is time for the cross to disappear (s). Control variables: concentration and volume of acid and thiosulfate (use same stock solutions), size of the cross, and the same observer to judge disappearance. Control is achieved by using measuring cylinders and keeping the tile unchanged.
在温度-速率探究中，自变量是温度（°C）；因变量是十字消失的时间（s）。控制变量：酸和硫代硫酸盐的浓度和体积（使用同一储备液）、十字的大小以及由同一观察者判断消失。通过使用量筒和保持瓷砖不变来实现控制。
6. Results: Presenting Data in Tables | 结果：用表格呈现数据
Draw a neat table with headings and units. Include columns for independent variable, dependent variable, and any calculated quantities (e.g., rate as 1/time). Use a ruler
Published by TutorHao | Year 11 Science Revision Series | aleveler.com
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