📚 Year 8 SQA Chemistry: Summer Preparation and Transition Course | SQA Year 8 化学：暑期预习与衔接课程
Moving into Year 8 (S2) marks an exciting step in your science journey, especially in chemistry. This summer, taking a little time to review what you already know and look ahead to new topics will help you feel confident and curious. In this guide, we will cover everything from the particle model to simple chemical reactions, building the bridge between Year 7 and the more structured chemical ideas you will meet next term.
进入 Year 8（S2）是你科学之旅中令人兴奋的一步，特别是在化学方面。这个暑假，花一点时间复习你已经掌握的知识并提前了解新课题，会让你充满信心和好奇心。在这篇指南中，我们将涵盖从粒子模型到简单化学反应的所有内容，为你搭建起连通 Year 7 与新学期更系统的化学概念的桥梁。
1. The Particle Model of Matter | 物质的粒子模型
All substances are made up of tiny particles that are constantly moving. In Year 7 you learned that the way these particles are arranged decides whether a material is a solid, a liquid or a gas.
所有物质都由不断运动的微小粒子组成。在 Year 7 你已经学过，这些粒子的排列方式决定了材料是固体、液体还是气体。
In solids, particles are packed closely in a fixed pattern and only vibrate in place. This gives solids a definite shape and volume.
在固体中，粒子紧密排列成固定模式，只能在原地振动。这让固体拥有确定的形状和体积。
In liquids, particles are still close together but can slide past each other, so a liquid takes the shape of its container while keeping a constant volume.
在液体中，粒子仍然紧挨在一起，但可以相互滑动，因此液体保持固定体积的同时会呈现容器的形状。
In gases, particles are far apart and move rapidly in all directions. Gases have no fixed shape or volume and can be compressed easily.
在气体中，粒子相距很远，朝各个方向快速运动。气体没有固定的形状或体积，容易被压缩。
2. Changes of State | 状态变化
When a substance is heated or cooled, its particles gain or lose energy. This can cause a change of state rather than a change in the type of substance.
当物质被加热或冷却时，其粒子会获得或失去能量。这会导致状态变化，但不会改变物质的种类。
Melting happens when a solid turns into a liquid at its melting point. Freezing is the reverse process, where a liquid becomes a solid.
熔化是指固体在熔点变成液体的过程。凝固是相反的过程，液体变成固体。
Boiling and evaporation change a liquid into a gas, while condensation turns a gas back into a liquid. Sublimation skips the liquid stage entirely, such as solid carbon dioxide turning directly into gas.
沸腾和蒸发使液体变为气体，而冷凝则将气体变回液体。升华则完全跳过液态，例如固体二氧化碳直接变为气体。
These physical changes do not produce new substances. In chemistry, you will learn to recognise the difference between physical and chemical changes.
这些物理变化不会产生新物质。在化学中，你将学习如何区分物理变化和化学变化。
3. Atoms, Elements and Symbols | 原子、元素与符号
An atom is the smallest part of an element that still has the properties of that element. Elements are pure substances made up of only one type of atom.
原子是元素的最小组成部分，仍然保留该元素的性质。元素是由一种类型的原子组成的纯物质。
Each element has a unique chemical symbol, often taken from its English or Latin name. For example, hydrogen is H, oxygen is O, carbon is C, iron is Fe and sodium is Na.
每种元素都有独特的化学符号，这些符号通常来源于其英文或拉丁文名称。例如，氢是 H，氧是 O，碳是 C，铁是 Fe，钠是 Na。
Scientists arrange elements in a special chart called the Periodic Table. In Year 8, you will start using it to predict how elements behave.
科学家将元素排列在一张特殊的图表中，称为元素周期表。在 Year 8，你将开始使用它来预测元素的性质。
4. Inside the Atom | 原子内部
Atoms themselves are made of even smaller particles: protons, neutrons and electrons. Protons carry a positive charge, electrons carry a negative charge, and neutrons have no charge.
原子本身由更小的粒子组成：质子、中子和电子。质子带正电荷，电子带负电荷，中子不带电。
The protons and neutrons are packed together in the central nucleus, while electrons move around the nucleus in energy levels or shells.
质子和中子紧密堆积在中心的原子核内，而电子则在能级或电子层上绕核运动。
In a neutral atom, the number of protons equals the number of electrons. The atomic number tells you how many protons an atom has, which determines which element it is.
在中性原子中，质子数等于电子数。原子序数告诉你原子中有多少个质子，它决定了这是哪种元素。
5. Introduction to the Periodic Table | 元素周期表入门
The Periodic Table organises all known elements in rows called periods and columns called groups. Elements in the same group have similar chemical properties.
元素周期表用称为周期的行和称为族的列来组织所有已知元素。同一族中的元素具有相似的化学性质。
Metals are found on the left side and in the centre of the table, while non-metals are located on the right. A zigzag line often separates them.
金属位于周期表的左侧和中间，而非金属位于右侧。通常有一条锯齿线将它们分开。
In Year 8 you will become familiar with the first 20 elements, their symbols and some of their everyday uses.
在 Year 8，你将熟悉前 20 号元素、它们的符号以及一些日常用途。
Group 1 elements are known as the alkali metals and are very reactive. Group 7 elements are the halogens, and Group 0 are the noble gases, which are very unreactive.
第 1 族元素被称为碱金属，非常活泼。第 7 族是卤素，第 0 族是稀有气体，它们很不活泼。
6. Compounds and Chemical Formulae | 化合物与化学式
When two or more different elements combine chemically, they form a compound. A compound has properties that are completely different from the elements it contains.
当两种或多种不同元素化学结合时，就形成化合物。化合物的性质与其所含元素的性质完全不同。
A chemical formula shows the types and numbers of atoms in a compound. For instance, water has the formula H₂O, meaning two hydrogen atoms bonded to one oxygen atom.
化学式表示化合物中原子的种类和数量。例如，水的化学式是 H₂O，表示两个氢原子与一个氧原子结合。
Other common compounds you will meet include carbon dioxide CO₂, sodium chloride NaCl and sulfuric acid H₂SO₄. The small subscript numbers tell you how many of each atom are present.
你会遇到的其他常见化合物包括二氧化碳 CO₂、氯化钠 NaCl 和硫酸 H₂SO₄。小的下标数字告诉你每种原子有多少个。
It is important to learn how to write and interpret these formulae correctly, as they are the language of chemistry.
学会正确书写和解读这些化学式非常重要，因为它们是化学的语言。
7. Chemical Reactions and Equations | 化学反应与方程式
A chemical reaction happens when substances change into new materials with different properties. Signs of a reaction include a colour change, a gas being given off, a precipitate forming or an energy change such as heating or light.
当物质变成具有不同性质的新材料时，就发生了化学反应。反应的迹象包括颜色变化、放出气体、生成沉淀或能量变化（如发热或发光）。
In a chemical reaction, the starting substances are called reactants, and the new substances formed are called products.
在化学反应中，起始物质称为反应物，生成的新物质称为产物。
A word equation uses the names of the reactants and products. A balanced symbol equation uses formulae and shows that atoms are not created or destroyed.
文字方程式使用反应物和产物的名称。配平的符号方程式使用化学式，并表明原子没有被创造或毁灭。
2H₂ + O₂ → 2H₂O
（两个氢分子与一个氧分子反应生成两个水分子）
You will begin to balance simple equations in Year 8, which is a key skill for all future chemistry work.
在 Year 8，你将开始配平简单的方程式，这是今后所有化学学习的关键技能。
8. Acids and Alkalis | 酸与碱
Acids are substances that release hydrogen ions (H⁺) when dissolved in water. Common laboratory acids include hydrochloric acid HCl, sulfuric acid H₂SO₄ and nitric acid HNO₃.
酸是溶解在水中时会释放氢离子 (H⁺) 的物质。常见的实验室酸包括盐酸 HCl、硫酸 H₂SO₄ 和硝酸 HNO₃。
Alkalis are soluble bases that release hydroxide ions (OH⁻) in water. Sodium hydroxide NaOH and potassium hydroxide KOH are typical examples.
碱是可溶性的碱类，在水中会释放氢氧根离子 (OH⁻)。氢氧化钠 NaOH 和氢氧化钾 KOH 是典型的例子。
The pH scale measures how acidic or alkaline a solution is. Values below 7 are acidic, 7 is neutral, and above 7 are alkaline.
pH 标度用于衡量溶液的酸性或碱性程度。数值低于 7 为酸性，7 为中性，高于 7 为碱性。
Indicators such as litmus change colour in acids and alkalis. Universal indicator gives a range of colours across the pH scale.
石蕊等指示剂在酸和碱中会变色。通用指示剂能在整个 pH 标度范围内呈现不同颜色。
A neutralisation reaction occurs when an acid and an alkali react to form a salt and water. This is an important reaction you will explore through practical work.
当酸与碱反应生成盐和水时，就发生了中和反应。这是你将通过实验工作探索的重要反应。
9. Separating Mixtures | 混合物分离
A mixture contains two or more substances that are not chemically joined. Unlike compounds, mixtures can be separated using physical techniques.
混合物含有两种或多种没有化学结合的物质。与化合物不同，混合物可以用物理方法进行分离。
Filtration is used to separate an insoluble solid from a liquid, for example sand from water. The solid stays on the filter paper and the liquid passes through.
过滤用于将不溶性固体与液体分离，例如从水中分离沙子。固体留在滤纸上，液体通过滤纸。
Evaporation and crystallisation are used to recover a dissolved solid from a solution. As the solvent evaporates, crystals of the solute form.
蒸发和结晶用于从溶液中回收已溶解的固体。随着溶剂蒸发，溶质的晶体逐渐形成。
Distillation separates a liquid from a mixture by boiling it and then condensing the vapour. It is especially useful when you need to collect the pure liquid, such as pure water from salt water.
蒸馏通过沸腾液体再冷凝蒸气来从混合物中分离液体。当你需要收集纯液体时（例如从盐水中获取纯水），它特别有用。
Chromatography separates dissolved substances, such as the different dyes in ink, based on how they move through a material.
色谱法根据溶解的物质在材料中的移动速度不同来分离它们，例如墨水中的不同染料。
10. Metals and Non-metals | 金属与非金属
Metals are usually shiny, good conductors of heat and electricity, and can be bent or hammered into shape (malleable). Non-metals tend to be dull, brittle and poor conductors.
金属通常有光泽，是热和电的良导体，并且可以弯曲或锤打成各种形状（具有延展性）。非金属则往往暗淡无光，易碎，导电导热性差。
Many metals react with acids to produce hydrogen gas and a salt. For example, zinc reacts with hydrochloric acid to form zinc chloride and hydrogen.
许多金属与酸反应生成氢气和一种盐。例如，锌与盐酸反应生成氯化锌和氢气。
The reactivity series lists metals in order of how vigorously they react. In Year 8, you will investigate simple reactions of metals with water, acid and oxygen.
活泼性顺序表根据金属反应的剧烈程度列出金属。在 Year 8，你将研究金属与水、酸和氧气的简单反应。
Non-metals display a wide range of properties, with elements like oxygen and nitrogen being gases at room temperature, while carbon and sulfur are solids.
非金属的性质多种多样，如氧和氮在室温下为气体，而碳和硫则为固体。
11. Practical Skills and Lab Safety | 实验技能与实验室安全
Working safely in a laboratory is the most important habit to develop. Always wear safety goggles, tie back long hair and follow your teacher's instructions carefully.
在实验室安全操作是需要培养的最重要的习惯。始终佩戴护目镜，将长发束在脑后，并认真听从老师的指导。
Learn the names and uses of common equipment such as Bunsen burners, beakers, test tubes, measuring cylinders and tripods. Knowing how to heat substances safely using a blue flame saves time and prevents accidents.
了解常用器材的名称和用途，如本生灯、烧杯、试管、量筒和三脚架。知道如何用蓝焰安全地加热物质，可以节省时间并防止意外。
When using the Bunsen burner, start with the air hole closed (yellow safety flame) and then adjust to a blue heating flame. Never leave a lit burner unattended.
使用本生灯时，首先关闭气孔（产生黄色安全焰），然后调至蓝色加热焰。绝不离开点燃的本生灯。
Rinse apparatus with distilled water before and after experiments, and record observations clearly. Good practical skills will help you in every chemistry topic.
实验前后用蒸馏水冲洗仪器，并清晰地记录观察结果。良好的实验技能将在每个化学课题中帮助你。
12. Tips for a Smooth Transition into Year 8 | 顺利过渡到 Year 8 的建议
Start by organising your notes from Year 7 and reviewing the key terms: particle, element, compound, mixture, acid and alkali. Build a glossary with definitions and examples.
首先整理你的 Year 7 笔记，并复习关键术语：粒子、元素、化合物、混合物、酸和碱。制作一个包含定义和例句的词汇表。
Try some online interactive periodic tables and simple pH simulations. Watching a few short videos on balancing equations can make your first lessons much easier.
尝试一些在线的互动元素周期表和简单的 pH 模拟实验。观看几个关于配平方程式的短视频会让你最初的几堂课轻松许多。
Set a routine of 20 minutes of chemistry reading twice a week during the summer. Even small consistent efforts build a strong foundation.
暑假期间养成每周两次、每次 20 分钟化学阅读的习惯。即使很小的持续努力也能建立坚实的基础。
Remember that asking questions is a sign of a great scientist. Write down any curiosity you have and bring it to your new chemistry teacher.
记住，提问是优秀科学家的标志。写下你所有的好奇心，带给你的新化学老师。
Published by TutorHao | Chemistry Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图