Year 11 Edexcel Science: Experimental/Practical Assessment Tips | 实验/实践考核要点

📚 Year 11 Edexcel Science: Experimental/Practical Assessment Tips | 实验/实践考核要点

In Year 11 Edexcel Science, experimental and practical skills are not only assessed through hands-on Core Practicals but also in written examinations. Understanding how to plan, carry out, analyse and evaluate investigations is essential for success. This article highlights the key points you must master.

在 Year 11 Edexcel 科学中，实验和实践技能不仅通过动手操作的核心实验来评估，也在笔试中考查。理解如何规划、实施、分析和评估实验对考试成功至关重要。本文将强调你必须掌握的关键要点。

1. Planning an Investigation | 设计实验规划

Every investigation begins with a clear aim and a testable hypothesis. A good hypothesis is based on scientific reasoning and often follows the format ‘If … then … because …’.

每个实验都从一个明确的目标和可检验的假设开始。一个好的假设基于科学推理，通常遵循“如果……那么……因为……”的格式。

You need to write a step-by-step method that another student could follow. Include details such as the apparatus, the quantity of substances, and the measurements to be taken.

你需要写出另一个学生可以遵循的逐步方法。包括仪器、物质数量以及要进行的测量等细节。

It is also important to state how you will ensure reliable results, for example by taking repeat readings and calculating a mean.

说明如何确保可靠的结果也很重要，例如通过重复读数并计算平均值。

2. Variables and Fair Testing | 变量与公平测试

Identify the independent variable (IV), dependent variable (DV) and control variables (CV). The IV is the factor you deliberately change; the DV is what you measure; CVs are all the other factors kept constant.

确定自变量(IV)、因变量(DV)和控制变量(CV)。自变量是你故意改变的因素；因变量是你测量的；控制变量是所有保持不变的其他因素。

For example, when investigating the effect of light intensity on the rate of photosynthesis, light intensity is the IV, the number of oxygen bubbles produced per minute is the DV, and temperature, CO₂ concentration and type of plant are CVs.

例如，在研究光强度对光合作用速率的影响时，光强度是自变量，每分钟产生的氧气气泡数是因变量，温度、二氧化碳浓度和植物种类是控制变量。

Only by changing one variable at a time can you be confident about the cause-effect relationship. This is a fair test.

只有每次只改变一个变量，你才能确信因果关系。这就是公平测试。

3. Common Apparatus and Measurement | 常用仪器与测量

You must be able to select appropriate apparatus for the measurements required. For example, a measuring cylinder is suitable for approximate volumes, but a burette or pipette is needed for precise volumes in titrations.

你必须能够选择合适的测量仪器。例如，量筒适用于大致体积，但滴定中需要滴定管或移液管来精确测量体积。

When reading scales, always position your eye at the same level as the meniscus to avoid parallax error. Use a thermometer with a suitable range and resolution, e.g., -10 °C to 110 °C graduated every 0.5 °C.

读取刻度时，始终将眼睛与液面弯月面在同一水平，以避免视差误差。使用具有适当量程和分度值的温度计，例如 -10 °C 到 110 °C，每

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