📚 Year 8 CIE Chemistry: Practical Assessment Key Points | Year 8 CIE 化学：实验/实践考核要点
In Year 8 CIE Chemistry, practical skills are just as important as theoretical knowledge. Your teacher will assess how well you can follow safety rules, use apparatus, make observations, record data, and draw conclusions. This article will guide you through the essential practical assessment points that often appear in checkpoint tests and school-based exams.
在 Year 8 CIE 化学中，实验技能与理论知识同等重要。老师将评估你是否能遵守安全规则、正确使用仪器、进行观察、记录数据并得出结论。本文将带你复习实验考核中的常见要点，这些内容常出现在 checkpoint 测试和校内考试中。
1. Safety in the Laboratory | 实验室安全
Always wear safety goggles and a lab coat to protect your eyes and skin from chemicals.
始终佩戴护目镜和实验服，以保护眼睛和皮肤免受化学品伤害。
Tie back long hair and tuck in loose clothing or ties when using a Bunsen burner. Never wear dangling jewellery.
使用本生灯时，应将长发束起，收好宽松的衣物或领带。切勿佩戴悬垂的首饰。
Never taste any chemicals or directly smell gases; gently waft the vapour towards your nose with your hand.
切勿品尝任何化学品或直接闻气体；应用手轻轻将蒸气扇向鼻子。
Know the location of the fire extinguisher, fire blanket, and first aid kit before starting any experiment.
在开始任何实验前，应知道灭火器、灭火毯和急救箱的位置。
Report all spills, breakages, or accidents to your teacher immediately, no matter how small they seem.
无论看起来多么轻微，一旦发生溢出、破碎或意外，应立即报告老师。
2. Naming and Using Common Apparatus | 常见仪器的名称与使用
You must recognise and name basic equipment: beaker, test tube, conical flask, measuring cylinder, Bunsen burner, tripod, gauze, heat-proof mat, test tube rack, spatula, stirring rod, and thermometer.
你必须能够识别并说出基本仪器：烧杯、试管、锥形瓶、量筒、本生灯、三脚架、石棉网、隔热垫、试管架、药匙、搅拌棒和温度计。
A Bunsen burner has a gas inlet, air hole, and collar. When the air hole is open, the flame is blue and roaring – used for heating. When closed, the flame is yellow and luminous – used as a safety flame.
本生灯有燃气入口、气孔和调节环。气孔打开时，火焰呈蓝色咆哮状，用于加热。关闭时，火焰呈黄色明亮状，用作安全火焰。
For measuring liquids, always use a measuring cylinder, not a beaker. Beakers are for mixing and holding liquids, not for precise measurements.
测量液体时始终使用量筒，而非烧杯。烧杯用于混合和盛放液体，不适合精确测量。
A test tube holder should be used when heating a test tube; never hold it with bare hands or paper towels.
加热试管时应使用试管夹；切勿用手或纸巾直接拿取。
3. Heating Substances Safely | 安全加热物质
When heating a test tube, point the open end away from yourself and others. Move the tube gently back and forth through the flame to heat evenly.
加热试管时，管口应远离自己和他人。在火焰中来回轻轻移动试管，使其均匀受热。
Use a test tube holder to hold the tube, and heat the liquid at the top first before moving down to avoid bumping.
使用试管夹夹持试管，先加热液体上部，再向下移动，以避免暴沸。
Never heat a closed container – the pressure buildup can cause an explosion.
切勿加热密闭容器——压力积聚可能导致爆炸。
Flammable liquids must be heated in a water bath, never directly over a flame. Turn off the Bunsen burner or switch to the yellow safety flame when not actively heating.
易燃液体必须在水浴中加热，严禁直接在火焰上加热。不加热时，应关闭本生灯或调至黄色安全火焰。
4. Measuring Liquids and Solids | 测量液体与固体
Read the volume of a liquid in a measuring cylinder at eye level. For water and most solutions, read the bottom of the curved meniscus.
在量筒中读取液体体积时，视线应与液面水平。对于水及大多数溶液，应以凹液面底部为准。
Place the measuring cylinder on a flat surface and allow the liquid to settle before reading. Record the value to the nearest 0.5 cm³ if the scale allows.
将量筒放在平坦的表面上，待液面稳定后再读数。若刻度允许，记录到最接近的 0.5 cm³。
Use a digital balance to measure mass. Place a weighing boat or paper on the pan, then press the tare (zero) button before adding the solid.
使用电子天平测量质量。在秤盘上放上称量纸或称量皿，按下去皮（清零）键，然后加入固体。
When using a thermometer, the bulb must be fully immersed in the substance but not touching the sides or bottom of the container. Wait for the reading to stabilise before recording.
使用温度计时，球部应完全浸入物质中，但不要接触容器壁或底部。待读数稳定后再记录。
To measure pH, dip a clean glass rod into the solution, touch it to a piece of universal indicator paper, and immediately compare the colour to the chart. Never dip the paper directly into the test tube.
测量 pH 时，用洁净的玻璃棒蘸取溶液，点在广用试纸上，立即与比色卡对比。切勿将试纸直接浸入试管中。
5. Observing Chemical Reactions | 观察化学反应
Look for signs of a chemical reaction: a colour change, formation of a precipitate (insoluble solid
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