📚 Year 7 CIE Science: Experimental and Practical Assessment Essentials | 7年级CIE科学：实验与实践考核要点
In Year 7 CIE Science, practical skills are just as important as theoretical knowledge. Your ability to plan, carry out, and evaluate experiments will be assessed throughout the year. This guide breaks down the key points you need to master for practical assessments. From staying safe in the lab to writing a clear conclusion, we will cover each step. By the end, you will understand exactly what examiners expect and how to demonstrate your scientific thinking. Let's get started!
在7年级CIE科学课程中，实践技能与理论知识同等重要。你计划、实施和评估实验的能力将在全年受到考核。本指南为你梳理了实践评估需要掌握的关键要点。从实验室安全到写出清晰的结论，我们将逐一讲解。读完后，你将清楚考官期待什么，以及如何展现你的科学思维。让我们开始吧！
1. Safety in the Laboratory | 实验室安全
Before any experiment, you must know the safety rules. Always wear safety goggles to protect your eyes from chemicals or heat. Tie back long hair and tuck in loose clothing to avoid catching fire or dipping into chemicals. Never taste or smell substances unless instructed by your teacher. Wash your hands after handling materials. Know the location of the fire extinguisher, first aid kit, and emergency exits.
进行任何实验前，你必须了解安全规则。始终佩戴护目镜，防止化学品或热量伤害眼睛。把长发扎好，塞好宽松衣物，避免着火或沾到化学品。除非老师指示，绝不品尝或直接闻任何物质。接触材料后要洗手。了解灭火器、急救箱和紧急出口的位置。
Report accidents immediately, even small spills. Clean up your workspace after the experiment. Never run or play in the laboratory.
立即报告事故，即使是小量溢出。实验结束后清理工作区。绝不在实验室奔跑或玩耍。
2. Understanding Variables | 理解变量
In every experiment, there are three types of variables: independent, dependent, and control variables. The independent variable is the one you change on purpose. The dependent variable is what you measure or observe; it changes because of the independent variable. Control variables are all the other factors you must keep the same to ensure a fair test.
在每个实验中，都有三类变量：自变量、因变量和控制变量。自变量是你故意改变的那个。因变量是你测量或观察的，它因为自变量而改变。控制变量是必须保持相同的所有其他因素，以确保公平测试。
For example, if you investigate how temperature affects the rate of sugar dissolving in water, the temperature is the independent variable. The time taken for sugar to dissolve is the dependent variable. Control variables include the volume of water, the amount of sugar, and the type of stirring.
例如，如果你研究温度如何影响糖在水中溶解的速度，温度是自变量。糖溶解所需的时间是因变量。控制变量包括水的体积、糖的量以及搅拌的方式。
3. Writing a Testable Hypothesis | 写出可检验的假设
A hypothesis is a prediction based on scientific knowledge. It is often written as an 'If... then...' statement. For example: 'If the temperature of water increases, then the sugar will dissolve faster because particles move more quickly at higher temperatures.' A good hypothesis must be clear and testable by experiment.
假设是基于科学知识的预测，通常写成“如果……那么……”的陈述。例如：“如果水温升高，那么糖会溶解得更快，因为温度升高时粒子运动更快。”一个好的假设必须清晰且可通过实验检验。
Avoid just stating what you think will happen without a reason. Always link your prediction to a scientific idea, such as particle theory or energy. Do not write a hypothesis as a question.
避免只说明你认为会发生什么而没有理由。始终将预测与科学概念联系起来，例如粒子理论或能量。不要把假设写成问句形式。
4. Planning a Fair Test | 设计公平测试
A fair test means that only the independent variable is changed, while all control variables are kept constant. This allows you to conclude that any change in the dependent variable is truly caused by the independent variable. If you change more than one thing at a time, you cannot tell which factor caused the result.
公平测试意味着只改变自变量，而所有控制变量保持不变。这样你才能得出因变量的任何变化确实是由自变量引起的。如果一次改变多个因素，就无法确定是哪个因素导致了结果。
For instance, when testing the effect of light on plant growth, you must use the same type of plant, pot size, amount of water, and temperature. Only the light intensity is varied. Always list your control variables before starting.
例如，测试光对植物生长的影响时，必须使用相同种类的植物、花盆大小、浇水量和温度。只有光照强度改变。在开始前务必列出你的控制变量。
5. Choosing and Using Apparatus Correctly | 正确选择和使用仪器
Selecting the right equipment is vital for accurate results. Common apparatus in Year 7 includes a beaker, measuring cylinder, thermometer, stopwatch, Bunsen burner, and tripod. Always check the scale and range of a measuring instrument. For example, use a measuring cylinder for liquid volumes rather than a beaker, because the cylinder gives more precise readings.
选择合适的设备对获得准确结果至关重要。7年级常用的仪器包括烧杯、量筒、温度计、秒表、本生灯和三脚架。始终检查测量仪器的刻度和量程。例如，使用量筒而不是烧杯来量取液体体积，因为量筒的读数更精确。
When reading a volume in a measuring cylinder, place your eye level with the bottom of the meniscus (the curved surface of the liquid). This avoids parallax error. A thermometer must be kept in the substance while reading; do not take it out. Use a stopwatch with a clear display and start timing exactly when the experiment begins.
读取量筒体积时，眼睛要与液面凹液面的底部平齐。这可以避免视差错误。使用温度计时，必须将温度计保持在物质中读数，不要取出。使用显示清晰的秒表，并在实验开始时准确计时。
6. Making Measurements and Observations | 进行测量与观察
Accurate measurements are the foundation of reliable results. Always record the unit with the number, for example, 25 ml, 30 °C, 10 s. Take repeat readings when possible, and calculate an average to reduce random errors. If you notice any anomalous results (results that do not fit the pattern), you may need to repeat that measurement or note it down separately.
准确的测量是可靠结果的基础。务必把单位和数字一起记录，例如 25 ml、30 °C、10 s。尽可能重复测量，并计算平均值以减少随机误差。如果你发现任何异常结果（不符合规律的结果），你可能需要重复该测量或单独记录下来。
Qualitative observations (such as colour change, fizzing, or production of a gas) should be described using clear, scientific language. For example, 'a white precipitate formed' rather than 'it went cloudy'. Use all your senses except taste.
定性观察（如颜色变化、起泡或产生气体）应使用清晰、科学的语言描述。例如，“生成白色沉淀”而不是“变浑浊了”。使用除味觉外的所有感官进行观察。
7. Recording Data in Tables | 用表格记录数据
Data tables make your results neat and easy to interpret. Every table should have a clear title that explains what was measured. The first column usually contains the independent variable, and the second column the dependent variable. Headings must include the quantity and unit, for example, 'Time (s)' or 'Temperature (°C)'.
数据表格让你的结果整洁且易于解读。每张表格都应有清晰的标题，说明测量了什么。第一列通常放自变量，第二列放因变量。表头必须包含数量和单位，例如“时间 (s)”或“温度 (°C)”。
An example table:
示例表格：
| Temperature of water (°C) | Time for sugar to dissolve (s) |
|---|---|
| 20 | 90 |
| 30 | 65 |
| 40 | 48 |
| 50 | 35 |
| 60 | 25 |
This table clearly shows the relationship. Always draw tables with a ruler and straight lines.
这张表格清楚地显示了关系。始终用直尺和直线绘制表格。
8. Drawing and Interpreting Graphs | 绘制与解读图表
Graphs help you visualise data and spot patterns. In Year 7, you will mostly draw bar charts for categoric data and line graphs for continuous data. For a line graph, plot the independent variable on the horizontal x-axis and the dependent variable on the vertical y-axis. Label both axes with the quantity and unit, and give the graph a title.
图表有助于可视化数据并发现规律。在7年级，你主要绘制分类数据的条形图和连续数据的折线图。对于折线图，把自变量画在水平x轴上，因变量画在垂直y轴上。给两条轴标上数量和单位，并为图表加上标题。
Use a sharp pencil to plot points as small crosses, then draw a line of best fit. The line does not have to join all points; it should show the general trend. If a point lies far from the line, you might have an anomalous result. Describe what the graph shows in words.
用削尖的铅笔把数据点画成小十字，然后画出最佳拟合线。该线不必连接所有点
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