📚 Year 9 SQA Chemistry: Vocabulary and Terminology Quick Memory Guide | 九年级SQA化学：词汇术语速记指南
Mastering the key vocabulary of SQA Year 9 Chemistry is like learning the alphabet of a new language—once you know the building blocks, everything else makes sense. This guide provides quick memory hooks and clear definitions to help you recall important terms fast. You will discover simple word associations, visual tricks and real examples that turn tricky words into friendly clues.
掌握SQA九年级化学的关键词汇就像学习一门新语言的字母表——一旦你掌握了这些基本要素，其他一切就都变得容易理解了。本指南提供了快速记忆窍门和清晰的定义，帮助你迅速记住重要术语。你将发现简单的词根联想、图像化技巧和真实例子，把难记的单词变成友好的提示。
1. Building Blocks of Matter | 物质的基本组成
Atom: The smallest particle of an element that can take part in a chemical reaction. Picture 'a-tom' as 'a tiny object of matter'.
原子：元素参与化学反应的最小粒子。可以把 "atom" 想象成 "a-tom"（一个微小的物体）。
Element: A substance made of only one type of atom. Elements are like the letters of the alphabet — each one is unique and cannot be broken down by chemical means.
元素：由同一种原子组成的纯物质。元素就像字母表中的字母——每一个都是独特的，化学方法无法再分解。
Molecule: Two or more atoms chemically bonded together. The word "molecule" contains the idea of a small mass; imagine a tiny cluster of legos stuck together.
分子：两个或更多原子通过化学键结合而成的粒子。"molecule" 含有 "小团" 的意思；想象一小簇粘在一起的乐高积木。
Compound: A substance formed when two or more different elements are chemically joined in fixed proportions. "Com-" means together, so compounds are combinations of elements.
化合物：当两种或以上不同元素以固定比例通过化学键结合而成的纯物质。"com-" 表示共同，所以化合物就是元素组合体。
Mixture: Different substances not chemically combined; they can be separated by physical methods like filtration or evaporation. A mixture is like a bowl of salad — everything keeps its own identity.
混合物：不同的物质没有发生化学结合，只是物理混合，可以通过过滤或蒸发等方法分开。混合物就像一碗沙拉——每一种食材都保持自己的特性。
2. The Periodic Table | 元素周期表
Period: A horizontal row in the periodic table. Think of a period as a sentence running across a page — each element in the same period has the same number of electron shells.
周期：元素周期表中的横排。把周期想象成横跨书页的句子——同一周期的元素具有相同的电子层数。
Group: A vertical column in the periodic table. Groups stand tall like a group of people; elements in the same group have the same number of valence electrons and similar chemical properties.
族：元素周期表中的纵列。族就像一群人竖着站成一列；同族元素具有相同的价电子数和相似的化学性质。
Metal: Elements that are shiny, good conductors of heat and electricity, and often malleable. Most elements on the left of the periodic table are metals.
金属：具有光泽、是热和电的良导体，通常具有延展性的元素。周期表左边的元素大多是金属。
Non-metal: Elements that are generally poor conductors, often brittle, and found on the right side of the periodic table.
非金属：通常导电导热性差、易脆的元素，位于周期表右侧。
Atomic number: The number of protons in the nucleus of an atom. It determines the identity of the element — think of it as the element's fingerprint.
原子序数：原子核中质子的数目。它决定了元素的身份——可以把它想象成元素的指纹。
Mass number: The total number of protons and neutrons in the nucleus. Remember, mass number is always larger than atomic number because it counts the heavy particles.
质量数：原子核中质子与中子数之和。记住，质量数因为计算了较重的粒子，所以总是比原子序数大。
3. Chemical Bonds and Compounds | 化学键与化合物
Ionic bond: A strong electrostatic attraction between oppositely charged ions, formed when a metal transfers electrons to a non-metal. Think "I owe you" to recall that one atom gives electrons to the other.
离子键：带相反电荷离子之间强烈的静电引力，由金属向非金属转移电子形成。用 "I owe you"（我欠你）来记，即一个原子把电子给了另一个。
Covalent bond: A bond formed when two atoms share a pair of electrons. "Co-" means together, so the atoms are cooperating by sharing.
共价键：两个原子通过共用一对电子形成的化学键。"co-" 表示共同，所以原子通过共用实现合作。
Ion: A charged particle formed when an atom gains or loses electrons. If it loses electrons, it becomes a positive ion (cation); if it gains, it becomes a negative ion (anion).
离子：原子得到或失去电子后形成的带电粒子。失去电子变成阳离子，得到电子变成阴离子。
Cation: Positive ion. Use the memory trick "cats have paws" — paws remind you of positive.
阳离子：带正电的离子。用 "cats have paws"（猫有爪子）联想，爪子让人想起 "positive"（正极）。
Anion: Negative ion. "An onion makes you cry", and the tears represent a negative feeling.
阴离子：带负电的离子。"an onion"（洋葱）会让你流泪，泪水代表负面情绪。
Valence electron: An electron in the outermost shell of an atom; it determines how the atom bonds. "Valence" sounds like "valentine" — valentines connect people, and valence electrons connect atoms.
价电子：原子最外层的电子，决定原子的成键方式。"valence" 音似 "valentine"（情人节），情人节让人相连，价电子让原子相连。
4. Chemical Reactions | 化学反应
Reactant: A substance that takes part in and undergoes change during a reaction. Reactants are written on the left of the arrow. Think "re-act" — they act again to become something new.
反应物：在化学反应中参与并发生变化的物质，写在箭头左边。用 "re-act"（再次行动）联想——它们再次行动变成新物质。
Product: A substance that is formed as a result of a chemical reaction and written on the right of the arrow. "Product" is what is produced.
生成物：化学反应生成的新物质，写在箭头右边。"product" 就是被生产出来的东西。
Catalyst: A substance that increases the rate of a reaction without being used up. Imagine a "cat" that sprints around making things faster but never gets tired.
催化剂：能加快反应速率而自身不被消耗的物质。想象一只 "cat"（猫）到处跑催快事物，却永远不累。
Activation energy: The minimum energy required for a reaction to occur. Think of it as the push you need to roll a boulder over a hill.
活化能：发生化学反应所需的最小能量。把它想象成推动巨石翻过山坡所需的力量。
Collision theory: For a reaction to happen, particles must collide with sufficient energy and correct orientation. No collision, no reaction — like two snooker balls that must hit hard enough to pot.
碰撞理论：发生反应的粒子必须具有足够能量和正确取向地碰撞。没有碰撞就没有反应——就像两个台球必须足够猛地撞击才能进袋。
Example: 2H₂ + O₂ → 2H₂O
5. Acids, Alkalis and pH | 酸、碱与pH值
Acid: A substance that releases hydrogen ions (H⁺) in water, tastes sour, and has a pH less than 7. "Acid" sounds sharp, just like its sour taste.
酸：在水中释放氢离子 (H⁺)、尝起来酸的、且pH值小于7的物质。"acid" 听起来很尖锐，就像它的酸味。
Alkali: A soluble base that releases hydroxide ions (OH⁻) in water, feels slippery, and has a pH greater than 7. "Alkali" reminds you of "alkaline", the opposite of acidic.
碱：可溶解的碱在水里释放氢氧根离子 (OH⁻)，摸起来滑腻，pH值大于7。"alkali" 让你想起 "alkaline"，是酸的反面。
pH scale: A measure of acidity or alkalinity from 0 (very acidic) to 14 (very alkaline), with 7 as neutral. pH stands for "power of hydrogen".
pH值标度：衡量酸碱性的尺度，范围从0（强酸性）到14（强碱性），7为中性。pH代表 "氢的力量"。
Neutralisation: e : The reaction between an acid and a base/alkali to form salt and water. Use the memory phrase "A Bear Neutralised" (Acid + Base → Neutralisation).
中和：酸与碱或可溶性碱反应生成盐和水的过程。用 "A Bear Neutralised"（一只熊被中和）来记：酸 + 碱 → 中和。
Indicator: A dye that changes colour according to pH, such as litmus (red in acid, blue in alkali). Universal indicator gives a full rainbow.
指示剂：根据pH值改变颜色的染料，例如石蕊（酸中红，碱中蓝）。通用指示剂显示彩虹色。
HCl + NaOH → NaCl + H₂O
6. Oxidation and Reduction | 氧化与还原
Oxidation: The loss of electrons from a substance, often combined with gaining oxygen. Use OIL RIG: Oxidation Is Loss (of electrons).
氧化：物质失去电子的过程，常常伴随得氧。用 OIL RIG 记：氧化意味着失电子（Oxidation Is Loss）。
Reduction: The gain of electrons by a substance, often combined with losing oxygen. OIL RIG: Reduction Is Gain (of electrons).
还原：物质得到电子的过程，常常伴随失氧。OIL RIG：还原意味着得电子（Reduction Is Gain）。
Redox: A reaction where both oxidation and reduction occur simultaneously. In a redox reaction, one substance is oxidised and another is reduced — they happen as a pair.
氧化还原反应：氧化和还原同时发生的反应。在氧化还原反应中，一个物质被氧化，另一个被还原——它们成对出现。
Oxidising agent: A substance that gains electrons and causes another substance to be oxidised. It itself gets reduced. Think of it as an electron thief.
氧化剂：得到电子并使另一物质被氧化的物质，它自身被还原。把它想象成偷电子的 "小偷"。
Reducing agent: A substance that loses electrons and causes another substance to be reduced. It itself gets oxidised — it is the electron donor.
还原剂：失去电子并使另一物质被还原的物质，它自身被氧化——是电子的 "捐赠者"。
2Mg + O₂ → 2MgO (Mg is oxidised, O₂ is reduced)
7. Energy Changes in Reactions | 反应中的能量变化
Exothermic reaction: A reaction that releases heat to the surroundings; the temperature rises. "Exo-" means exit, so heat exits. Exothermic reactions feel hot — like burning fuels or neutralisation.
放热反应：向周围环境释放热量的反应，温度计示数升高。"exo-" 表示向外，所以热量 "走出去了"。放热反应摸上去很热，比如燃烧或中和反应。
Endothermic reaction: A reaction that absorbs heat from the surroundings; the temperature drops. "Endo-" means enter, so heat enters. Endothermic reactions feel cold — like photosynthesis or dissolving ammonium nitrate.
吸热反应：从周围环境吸收热量的反应，温度下降。"endo-" 表示向内，所以热量 "进来了"。吸热
Published by TutorHao | Year 9 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