📚 Year 7 SQA Chemistry: Summer Preparation & Bridging Course | SQA 七年级化学：暑期预习与衔接课程
Welcome to your summer chemistry journey! This bridging resource is designed to help you move smoothly from primary science into Year 7 SQA Chemistry. You will explore key ideas like safety in the lab, states of matter, the periodic table, and simple chemical reactions. By reading each bilingual section, you build both scientific understanding and the language needed to discuss chemistry confidently. Let’s start with curiosity, care, and a sense of wonder about the materials that make up our world.
欢迎踏上暑期化学之旅！这份衔接资料旨在帮助你从小学科学平稳过渡到 SQA 七年级化学。你将探索实验室安全、物质状态、元素周期表和简单化学反应等关键概念。通过阅读每一个中英双语板块，你不仅能建立科学理解，还能掌握自信讨论化学所需的语言。让我们带着好奇心、谨慎态度和对构成世界之物质的惊叹，一起开始吧。
1. Welcome to Chemistry: Safety & Lab Skills | 欢迎来到化学世界：安全与实验技能
Before you carry out any experiment, you must know the core lab safety rules. Always wear safety goggles, tie back long hair, and roll up loose sleeves. Never eat, drink, or taste anything in the lab, and wash your hands after handling chemicals.
在进行任何实验之前，你必须了解核心的实验室安全规则。务必佩戴护目镜，扎起长发，卷起宽松的袖子。切勿在实验室饮食或品尝任何东西，接触化学试剂后要及时洗手。
Learn to recognise common hazard symbols such as flammable, corrosive, toxic, and irritant. These symbols help you to assess risk quickly. When you see a Bunsen burner, remember the correct order: light the match before turning on the gas, and always use a safety flame when not heating actively.
学会识别常见的危险标志，如易燃、腐蚀性、有毒和刺激性标志。这些符号能帮助你快速评估风险。使用本生灯时，记住正确的操作顺序：先划火柴再开气阀，不加热时应切换到安全火焰。
2. States of Matter: Solids, Liquids & Gases | 物质状态：固体、液体和气体
All substances around you exist as solids, liquids or gases. In a solid, particles are tightly packed in a regular pattern and can only vibrate in fixed positions. That is why solids keep a definite shape and volume.
你周围的所有物质都以固体、液体或气体的形式存在。固体中的粒子紧密排列，呈规则形态，只能在固定位置振动。这就是固体保持一定形状和体积的原因。
In a liquid, particles are still close together but can slide past one another, so liquids flow and take the shape of their container. In a gas, particles are far apart, move rapidly in all directions, and spread out to fill any available space. Heating a substance gives particles more energy, which can trigger changes of state: melting, boiling, condensing or freezing.
在液体中，粒子仍然彼此靠近，但可以相互滑动，因此液体会流动并呈现容器的形状。气体中的粒子相距很远，快速地向各个方向运动，充满整个空间。加热物质会给粒子更多能量，从而引发状态变化：熔化、沸腾、冷凝或凝固。
Change of state is a physical process, not a chemical one. For example, when ice melts into water, it is still H₂O. Understanding particle theory helps you explain why a puddle dries up or why a balloon inflates with air.
状态变化是物理过程，而不是化学变化。例如，冰融化成水，它依然是 H₂O。理解粒子理论可以帮助你解释水坑何以干涸，气球何以充满空气。
3. Elements, Compounds & Mixtures | 元素、化合物与混合物
An element is a pure substance made of only one type of atom. Every element is listed on the periodic table; examples include oxygen (O), iron (Fe) and gold (Au). A compound forms when two or more different elements chemically combine in a fixed ratio, such as water (H₂O) or carbon dioxide (CO₂).
元素是仅由一种原子组成的纯净物。每种元素都列在元素周期表上，例如氧 (O)、铁 (Fe) 和金 (Au)。当两种或更多不同元素以固定比例发生化学结合时，就形成化合物，如水 (H₂O) 或二氧化碳 (CO₂)。
A mixture contains two or more substances that are not chemically joined, so each keeps its own properties. Air is a mixture of gases; a salad is a mixture of solids. You can often separate mixtures by physical methods like filtering or evaporation. This is very different from breaking a compound, which needs a chemical reaction.
混合物含有两种或更多物质，它们之间没有化学键合，因此各组分保持自身的性质。空气是气体的混合物；沙拉是固体的混合物。混合物通常可用过滤或蒸发等物理方法分离。这与打破化合物截然不同，后者需要化学反应。
4. Introduction to the Periodic Table | 元素周期表入门
The periodic table is the chemist’s map of all known elements. It arranges elements in order of increasing atomic number and groups those with similar properties into vertical columns called groups. Metals are found on the left and centre, while non-metals occupy the upper right.
元素周期表是化学家们的地图，记录了所有已知元素。它按原子序数递增排列，并把性质相似的元素归入称为族的纵列。金属位于左侧和中部，非金属位于右上方。
Each element symbol is a shorthand version of its name, often from Latin or English. You should try to memorise the symbols of the first 20 elements: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca. These build the foundation for writing chemical formulas later.
每个元素符号都是其名称的简写，常来自拉丁语或英语。你应试着记下前 20 种元素的符号：H、He、Li、Be、B、C、N、O、F、Ne、Na、Mg、Al、Si、P、S、Cl、Ar、K、Ca。它们是日后书写化学式的基础。
Groups have special names: Group 1 is the alkali metals, Group 7 is the halogens, and Group 0 (or 8) is the noble gases. Recognising these families helps you predict how an element might behave.
族还有特殊的名称：第 1 族是碱金属，第 7 族是卤素，第 0 族（或第 8 族）是稀有气体。认识这些家族有助于你预测元素可能的行为方式。
5. Atoms & Molecules: Building Blocks of Matter | 原子与分子：物质的基本微粒
Atoms are the tiniest units of an element that still show chemical properties. Every atom has a central nucleus containing protons and neutrons, surrounded by electrons whizzing around in shells. Protons carry a positive charge, electrons a negative charge, and neutrons are neutral.
原子是元素中仍能体现化学性质的最小单元。每个原子都有一个由质子和中子组成的中央核，外围是分层高速运动的电子。质子带正电，电子带负电，中子不带电。
The atomic number tells you the number of protons, which defines the element. For a neutral atom, the number of electrons equals the number of protons. The mass number is the total of protons and neutrons. Using simple diagrams, you can draw the electronic configuration of the first 20 elements, filling shells up to 2, 8, 8 electrons.
原子序数表示质子数，它决定了元素的种类。对于中性原子，电子数等于质子数。质量数则是质子与中子的总和。借助简易图，你可以画出前 20 种元素的电子排布，电子层按 2、8、8 的规则填充。
A molecule is a group of two or more atoms bonded together. Some molecules are elements, like O₂ (dioxygen) or N₂ (dinitrogen); others are compounds, like CO₂ or H₂O. Learning to distinguish atoms and molecules helps you make sense of chemical formulas.
分子是由两个或更多原子结合而成的集团。有些分子是单质，如 O₂（双氧）或 N₂（双氮）；另一些是化合物，如 CO₂ 或 H₂O。学会区分原子和分子有助于你理解化学式。
6. Chemical Reactions: Signs & Examples | 化学反应：现象与实例
A chemical reaction happens when substances change into new products with different properties. Common signs include a colour change, a gas being given off (bubbles), a temperature change, or a precipitate (solid) appearing from two clear solutions.
当物质变成性质不同的新产物时，就发生了化学反应。常见的现象有颜色改变、放出气体（气泡）、温度变化或两种澄清溶液混合后出现沉淀（固体）。
rd equation shows what happens: methane + oxygen → carbon dioxide + water. The arrow means 'reacts to produce' re rearranged, but none are created or destroyed. This is called the conservation of mass.
简单的文字方程式表明反应过程：甲烷 + 氧气 → 二氧化碳 + 水。箭头表示“反应生成”。左边是反应物，右边是生成物。反应过程中，原子重新排列，但既没有被创造也没有被消灭，这称为质量守恒。
Combustion and oxidation are common reaction types you will meet. Burning magnesium ribbon in air produces a brilliant white light and leaves behind magnesium oxide, a white powder. Observing such reactions helps you link signs to chemical change.
你将见到燃烧和氧化等常见反应类型。在空气中点燃镁条会发出耀眼白光，并留下白色粉末氧化镁。观察这些反应有助于你将现象与化学变化联系起来。
7. Acids & Alkalis: pH Scale | 酸与碱：pH 标度
Acids and alkalis are chemical opposites. Acids taste sour (though you must never taste them in the lab), turn blue litmus paper red, and have pH values less than 7. Alkalis feel soapy, turn red litmus paper blue, and have pH values greater than 7. A neutral substance, like pure water, has a pH of exactly 7.
酸和碱是化学上的对立面。酸有酸味（但绝不能在实验室品尝），使蓝色石蕊试纸变红，pH 小于 7。碱有滑腻感，使红色石蕊试纸变蓝，pH 大于 7。中性物质如纯水，pH 恰为 7。
Indicators, such as universal indicator or red cabbage juice, show the pH level by changing colour. The pH scale runs from 0 (strong acid) to 14 (strong alkali). Everyday acids include vinegar (acetic acid) and lemon juice (citric acid); household alkalis include baking soda and soap.
指示剂，如通用指示剂或红卷心菜汁，通过变色来显示 pH 水平。pH 标度从 0（强酸）到 14（强碱）。日常生活中的酸包括醋（醋酸）和柠檬汁（柠檬酸）；家用碱包括小苏打和肥皂。
When an acid and an alkali react together, they cancel each other out in a neutralisation reaction. This produces a salt and water. For example, hydrochloric acid and sodium hydroxide react to give sodium chloride (table salt) and water.
酸与碱互相作用时，会在中和反应中抵消彼此。这生成一种盐和水。例如，盐酸和氢氧化钠反应生成氯化钠（食盐）和水。
8. Separating Mixtures: Simple Techniques | 混合物的分离：简单方法
Because the components of a mixture are only physically mixed, chemists can separate them using techniques based on differences in physical properties. Filtration separates an insoluble solid from a liquid, for instance sand from water. The solid left on the filter paper is the residue, and the liquid that passes through is the filtrate.
由于混合物的组分只是物理混合，化学家可利用物理性质的差异对其进行分离。过滤能将不溶性固体与液体分开，例如将沙子从水中分离。留在滤纸上的固体是残渣，透过的液体是滤液。
Evaporation and crystallisation are used to obtain a dissolved solid from a solution. By gently heating seawater, the water evaporates, leaving salt crystals behind. Distillation, on the other hand, collects the liquid as well – it boils the liquid, then condenses the vapour back into a pure liquid, as used in making distilled water.
蒸发和结晶用于从溶液中得到溶解的固体。缓缓加热海水，水蒸发后留下盐的晶体。蒸馏则不同，它也能回收液体——将液体煮沸，再使蒸气冷凝成纯净液体，就像制造蒸馏水那样。
Chromatography can separate coloured substances, such as the dyes in ink. As the solvent soaks up through paper, different dyes travel at different speeds, creating a pattern that helps identify each component. These separation skills are not only practical but also show the difference between pure substances and mixtures.
色谱法可以分离有色物质，例如墨水中的染料。溶剂沿纸上行时，不同的染料移动速度不同，形成图案，有助于鉴别各组分。这些分离技能不仅实用，还展示出纯净物与混合物的区别。
9. Key Skills: Measurement, Observation & Recording | 关键技能：测量、观察与记录
Good chemistry depends on accurate observation. Use all your senses where safe, but never taste or directly inhale chemicals. Note the colour, state, clarity, odour (by wafting) and temperature before and after an experiment. Write these observations clearly, using scientific vocabulary such as 'transparent', 'opaque', 'effervescence' or 'precipitate'.
优秀的化学实验依赖于准确的观察。在安全的前提下运用所有感官，但切勿品尝或直接吸入化学品。记录实验前后的颜色、状态、透明度、气味（用手扇闻）和温度。用清晰的科学用语写下观察结果，如“透明”、“不透明”、“泡腾”或“沉淀”。
Measuring is just as important. Use a measuring cylinder for volumes of liquids, reading at eye level from the bottom of the meniscus. Record mass with a digital balance, and measure temperature with a thermometer, holding it steady without touching the container sides. Always include units: grams (g), millilitres (mL), degrees Celsius (°C).
测量同样重要。用量筒测量液体体积，在眼睛水平位置读取凹液面底部。用数字天平记录质量，用温度计测量温度，保持稳定且不碰容器壁。务必写出单位：克 (g)、毫升 (mL)、摄氏度 (°C)。
Present your data in neat tables with headings that show both quantity and unit. When appropriate, plot a line graph or bar chart. The independent variable goes on the x‑axis, the dependent variable on the y‑axis. Practice makes these skills second nature and prepares you for more advanced investigations.
将数据整齐地呈现在表格中，表头注明量值和单位。适当的时候，绘制折线图或条形图。自变量放在 x 轴，因变量放在 y 轴。多加练习，这些技能就会成为你的第二天性，并为更深入的探究做好准备。
10. Summer Bridging Tasks: Experiment Ideas | 暑期衔接任务：实验创意
mple activities with an adult present. Try mixing baking soda with vinegar in a tall glass – observe the vigorous effervescence. This is the acid‑ n carbonate → sodium acetate + water + carbon dioxide. The bubbles are carbon dioxide gas.
安全第一：只有在成人陪同下才能进行这些简单活动。试着在长玻璃杯中将小苏打与醋混合——观察剧烈的冒泡现象。这是酸与碳酸盐的反应：乙酸 + 碳酸氢钠 → 乙酸钠 + 水 + 二氧化碳。气泡就是二氧化碳气体。
Grow your own crystals by dissolving as much table salt or sugar as possible in hot water, then letting the solution cool slowly. Over a few days, crystals will form as the solvent evaporates. This mimics the separation technique of crystallisation. Compare the shape of salt crystals (cuboidal) with sugar crystals (monoclinic).
自己动手培养晶体：在热水中溶解尽可能多的食盐或糖，然后让溶液慢慢冷却。几天内，随着溶剂蒸发，晶体会逐渐形成。这模拟了结晶的分离技术。比较食盐晶体（立方体形）与糖晶体（单斜晶形）的形状。
Create your own pH indicator by boiling chopped red cabbage, then using the purple liquid to test lemon juice, soap solution and tap water. Record the colour changes and arrange substances on a homemade pH line. This hands‑on task brings the pH scale to life and sharpens observational skills.
自制 pH 指示剂：将切碎的红卷心菜煮沸，用得到的紫色液体检测柠檬汁、肥皂水和自来水。记录颜色变化，并把物质排列在自己绘制的 pH 线上。这个动手任务让 pH 标度变得鲜活，同时磨炼观察能力。
Keep a summer chemistry journal. Sketch your experimental set‑ups, note your predictions and compare them with what actually happened. Reflecting on results is just as important as carrying out the practical work.
准备一本暑期化学日志。画下实验装置简图，写下你的预测，并将预测与实际结果进行对比。反思结果与动手操作同样重要。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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