📚 Key Skills for Year 7 CIE Chemistry Practical Assessments | CIE 七年级化学实验/实践考核要点
Practical work is the heart of chemistry. In Year 7, the CIE curriculum introduces you to the laboratory environment, teaching you how to work safely, use basic apparatus, and record observations accurately. Mastering these fundamental skills will not only boost your confidence but also prepare you for the more advanced practical assessments in later years. This article breaks down the essential practical skills you need to demonstrate, from safety rules to writing a clear conclusion.
实验是化学的核心。在七年级，CIE 课程将你带入实验室环境，教你如何安全操作、使用基本仪器并准确记录观察结果。掌握这些基本技能不仅能增强你的信心，还能为你以后更高级的实验考核打下基础。本文将详细分解你需要展示的关键实验技能，从安全规则到撰写清晰的结论。
1. Lab Safety and Personal Conduct | 实验室安全与个人行为
Always enter the laboratory calmly and place your bag and coat in the designated area. Listen carefully to your teacher's instructions before touching any equipment. Never run, push, or play in the lab. Know the location of the fire extinguisher, fire blanket, and eyewash station. If you have long hair, tie it back; roll up loose sleeves and remove dangling jewellery. Wear safety goggles at all times when handling chemicals or heating substances.
进入实验室时要保持安静，将书包和外套放在指定区域。触碰任何器材之前，务必仔细聆听老师的指示。严禁在实验室里奔跑、推搡或嬉戏。了解灭火器、灭火毯和洗眼器的位置。长发应束起，宽松的袖子要卷起来，并摘下悬挂的首饰。在处理化学品或加热物质时，必须始终佩戴护目镜。
2. Identifying Common Laboratory Apparatus | 识别常见实验仪器
You must be able to name and sketch key pieces of equipment: beaker, conical flask, measuring cylinder, test tube, boiling tube, Bunsen burner, tripod, gauze, heat‑proof mat, evaporating basin, filter funnel, spatula, and stirring rod. For each item, understand its purpose – for example, a beaker is used for holding and mixing larger volumes of liquids, while a test tube is ideal for holding small amounts during reactions.
你必须能说出并画出关键仪器的名称：烧杯、锥形瓶、量筒、试管、沸腾管、本生灯、三脚架、石棉网、隔热垫、蒸发皿、过滤漏斗、药匙和搅拌棒。对每种仪器，要理解其用途——例如，烧杯用于盛放和混合较大体积的液体，而试管则适合在反应中盛放少量物质。
3. Using a Bunsen Burner Correctly | 正确使用本生灯
The Bunsen burner has two main flames: the yellow safety flame (air hole closed) and the blue heating flame (air hole open). Always light the burner with the air hole closed to obtain the visible yellow flame first. Then, open the air hole to produce a roaring blue flame for heating. Never leave a lit Bunsen burner unattended. The hottest part of the blue flame is the tip of the inner cone.
本生灯有两种主要火焰：黄色安全焰（气孔关闭）和蓝色加热焰（气孔打开）。点燃本生灯时，务必先关闭气孔，获得可见的黄色火焰。然后再打开气孔，产生用于加热的蓝色强焰。切勿让点燃的本生灯无人看管。蓝色火焰温度最高的部分是内焰锥的尖端。
4. Measuring Mass, Volume, and Temperature | 测量质量、体积和温度
Use an electronic balance to find the mass of a substance. Remember to place a weighing boat or paper on the pan first, then press 'Tare' to zero the balance before adding the chemical. For volume, a measuring cylinder is the most common tool; read the bottom of the meniscus at eye level. For temperature, use a thermometer, holding it in the liquid without touching the bottom or sides of the container, and wait until the reading stops changing.
使用电子天平称量物质质量。记得先在秤盘上放置称量舟或称量纸，然后按“去皮”键将天平归零，再加入化学品。测量体积最常用的工具是量筒；读数时应目光平视凹液面的最低点。测量温度时，使用温度计，将其悬在液体中，不触碰容器底部或内壁，等读数稳定不变时再记录。
5. Heating Substances Safely | 安全加热物质
When heating a test tube of liquid, use a test‑tube holder and point the open end away from yourself and others. Move the tube gently in and out of the flame to avoid bumping and boiling over. For heating a beaker of water, set up a tripod, gauze, and heat‑proof mat, then place the beaker on the gauze. Always use a medium or roaring blue flame to heat the gauze evenly.
加热试管中的液体时，使用试管夹，并将试管口朝向无人处。轻轻将试管在火焰中来回移动，以防止暴沸和溢出。加热烧杯中的水时，应架好三脚架、石棉网和隔热垫，然后将烧杯放在石棉网上。始终使用中等或强力的蓝色火焰，使石棉网均匀受热。
6. Making and Recording Observations | 进行并记录观察结果
Observation is more than just looking. You must record changes in colour, state (solid, liquid, gas), temperature, and any fizzing or bubbling. Use precise language – for example, 'the clear colourless liquid turned cloudy white' or 'a bright orange solid dissolved to form a pale yellow solution'. Make your notes in ink directly in your lab notebook, and never rely on memory later.
观察不仅仅是看。你必须记录颜色、状态（固体、液体、气体）、温度的变化以及是否有嘶嘶声或气泡产生。使用精确的语言——例如，“透明无色液体变为浑浊白色”或“亮橙色固体溶解形成浅黄色溶液”。用墨水直接记录在实验笔记本上，切勿事后凭记忆补充。
7. Presenting Data in Tables and Graphs | 在表格和图表中呈现数据
Draw a table with ruled lines and clear headings, including units in brackets, e.g. 'Mass of salt (g)' raph, label both axes with the variable name and unit, choose a sensible scale, and plot points with small crosses (×). Draw a line of best fit; this could be a smooth curve or a straight line, depending on the data.
绘制表格要用直尺画线，标题清晰，并在括号中标明单位，例如“盐的质量 (g)”。自变量（你改变的变量）放在左列；因变量（你测量的变量）放在右列。绘制图表时，在两条坐标轴上标明变量名称和单位，选择合理的刻度，用小叉号（×）描点。画出一条最佳拟合线；根据数据情况，可能是平滑曲线或直线。
8. Simple Separation Techniques: Filtration and Evaporation | 简单分离技术：过滤与蒸发
Filtration separates an insoluble solid from a liquid. Fold the filter paper into a cone, place it in a filter funnel, and pour the mixture slowly down a stirring rod to avoid splashing. The solid remains on the filter paper (residue), while the liquid passes through (filtrate). For a soluble salt dissolved in water, use evaporation: heat the solution in an evaporating basin on a steam bath or gentle blue flame until all the water has evaporated, leaving the solid salt behind.
过滤用于分离不溶性固体与液体。将滤纸折叠成锥形，放入过滤漏斗中，把混合物沿搅拌棒缓慢倒入以避免飞溅。固体留在滤纸上（滤渣），液体则通过滤纸（滤液）。对于溶解于水的可溶性盐，则使用蒸发：将溶液放在蒸发皿中，用水浴或温和的蓝色火焰加热，直到水分全部蒸发，留下固体盐。
9. Testing for Common Gases | 测试常见气体
You need to know three key tests. For hydrogen, hold a lit splint near the mouth of the test tube: it burns with a squeaky pop. For oxygen, insert a glowing splint: it will relight. For carbon dioxide, bubble the gas through limewater (calcium hydroxide solution) or hold a drop of limewater on a glass rod in the gas: the limewater turns milky or cloudy. Always describe the initial and final appearance.
你需要掌握三种关键气体的测试。氢气：在试管口附近放一根点燃的木条，会发出“咻”的爆鸣声。氧气：伸入一根带火星的木条，木条会重新燃烧起来。二氧化碳：将气体通入石灰水中，或者用玻璃棒蘸一滴石灰水放入气体中，石灰水会变成牛奶状或浑浊。务必描述测试前后的变化。
10. Planning a Simple Investigation | 设计简单探究实验
Before starting any practical, think about your aim and write a clear hypothesis. Identify the independent variable (what you will change), the dependent variable (what you will measure), and the control variables (what you must keep the same). For example, when investigating how salt dissolves faster in warm water, the temperature of the water is the independent variable, the time taken to dissolve is the dependent variable, and the mass of salt, type of salt, and volume of water are controls.
在开始任何实验之前，先考虑你的目的，并写出清晰的假设。确认自变量（你要改变的）、因变量（你要测量的）以及控制变量（必须保持不变的）。例如，在研究盐在温水中如何溶解得更快时，水温是自变量，溶解所需的时间是因变量，而盐的质量、盐的种类和水的体积都是控制变量。
11. Identifying Sources of Error and Uncertainties | 识别误差来源与不确定性
stopwatch with slow reaction time. For a measuring cylinder, state the uncertainty; for example, a 50 cm³ cylinder might have an uncertainty of ±1 cm³. In your conclusion, suggest how to reduce these errors, such as repeating measurements and calculating an average.
没有测量是完美的。常见的误差来源包括读数不正确（视差）、热量散失到周围环境，或使用秒表时反应时间较慢。对于量筒，要说明其不确定性；例如，一个50 cm³量筒的不确定性可能是±1 cm³。在结论中，提出如何减少这些误差，比如重复测量并计算平均值。
12. Writing a Clear Conclusion and Evaluation | 撰写清晰的结论与评价
Your conclusion must refer back to the aim and the hypothesis. State whether the results support your prediction, using data from your table or graph. For example: 'The time taken for the salt to dissolve decreased as the temperature increased, from 45 s at 20 °C to 15 s at 60 °C. This supports the hypothesis that higher temperature speeds up dissolving.' Then evaluate your method: what worked well, what could be improved, and suggest a further experiment.
你的结论必须回扣实验目的与假设。使用表格或图表中的数据，说明结果是否支持你的预测。例如：“随着温度升高，盐溶解所需的时间从20 °C的45秒减少到60 °C的15秒。这支持了较高温度可加快溶解的假设。”然后评价你的方法：哪些方面有效，哪些可以改进，并建议一个进一步的实验。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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