📚 Reactivity Series of Metals | 金属反应性序列
The reactivity series is a fundamental concept in IGCSE Chemistry. It ranks metals according to how vigorously they react with substances like water, acids, and oxygen. Understanding this series allows us to predict displacement reactions, choose suitable methods for extracting metals from their ores, and explain corrosion and its prevention. This article provides a thorough revision of the reactivity series for Edexcel IGCSE Science, including key reactions, experimental techniques, and examination tips.
反应性序列是 IGCSE 化学中的一个基本概念。它根据金属与水、酸和氧气等物质反应的剧烈程度对金属进行排序。理解这一序列使我们能够预测置换反应、选择合适的从矿石中提取金属的方法，并解释腐蚀及其预防。本文为 Edexcel IGCSE 科学考试全面复习反应性序列，涵盖关键反应、实验技巧和考试建议。
1. Introduction to Reactivity Series | 反应性序列简介
The reactivity series arranges metals from the most reactive to the least reactive. The most reactive metals, such as potassium and sodium, lose electrons very easily and react violently with cold water. At the other end, metals like gold and platinum are extremely unreactive and occur naturally in their elemental state.
反应性序列将金属从最活泼到最不活泼排列。最活泼的金属，如钾和钠，非常容易失去电子，与冷水发生剧烈反应。另一端的金属，如金和铂，反应性极低，在自然界中以单质形式存在。
A metal's reactivity is linked to its tendency to form positive ions. The easier a metal atom loses its outer electrons, the more reactive it is. This electron‑loss tendency can be studied through reactions with water, dilute acids, and salt solutions.
金属的反应性与其形成正离子的倾向有关。金属原子越容易失去外层电子，反应性就越强。这种失电子倾向可以通过与水、稀酸以及盐溶液的反应来研究。
2. The Reactivity Series Order | 反应性序列顺序
The common reactivity series for IGCSE is: Potassium (most reactive), Sodium, Calcium, Magnesium, Aluminium, (Carbon), Zinc, Iron, (Hydrogen), Copper, Silver, Gold (least reactive). Carbon and hydrogen are non‑metals but are included because they are used as reference points for extraction and acid reactions.
IGCSE 常见的反应性序列为：钾（最活泼）、钠、钙、镁、铝、（碳）、锌、铁、（氢）、铜、银、金（最不活泼）。碳和氢是非金属，但被列入其中，因为它们是提取金属和酸反应的参考点。
A mnemonic to remember the order is: "Please Stop Calling Me A Cute Zebra In The Library – Call Something Good." (PSCMA CZ I TL CSG). Always check your specification to confirm the exact sequence.
一个记忆顺序的口诀是：“Please Stop Calling Me A Cute Zebra In The Library – Call Something Good.”（PSCMA CZ I TL CSG）。务必核对考纲以确认确切顺序。
| Metal / 金属 | Reactivity / 反应性 | Reaction with cold water / 与冷水反应 | Reaction with dilute acid / 与稀酸反应 |
|---|---|---|---|
| K, Na | Extremely high | Violent, produce H₂ | Explosive |
| Ca, Mg, Al | High | Slow or with steam | Vigorous |
| Zn, Fe | Moderate | No reaction | Slow to moderate |
| Cu, Ag, Au | Low | No reaction | No reaction |
3. Reactions of Metals with Water | 金属与水的反应
Reactive metals react with water to produce a metal hydroxide and hydrogen gas. The more reactive the metal, the more vigorous the reaction.
活泼金属与水反应生成金属氢氧化物和氢气。金属越活泼，反应越剧烈。
Example with sodium: 2Na + 2H₂O → 2NaOH + H₂. Sodium melts into a silvery ball, fizzes rapidly, and moves around the water surface.
以钠为例：2Na + 2H₂O → 2NaOH + H₂。钠熔化成闪亮的银白色小球，剧烈冒泡，在水面上四处游动。
Calcium reacts less violently: Ca + 2H₂O → Ca(OH)₂ + H₂. Magnesium reacts very slowly with cold water but burns brightly in steam: Mg + H₂O (steam) → MgO + H₂.
钙的反应较不剧烈：Ca + 2H₂O → Ca(OH)₂ + H₂。镁与冷水的反应非常缓慢，但在水蒸气中剧烈燃烧：Mg + H₂O (steam) → MgO + H₂。
Metals below magnesium in the reactivity series, such as zinc, iron, and copper, show no visible reaction with cold water. This difference is used to place metals in the series during practical investigations.
反应性序列中排在镁以下的金属，如锌、铁和铜，与冷水没有明显反应。这一差异被用于在实验探究中将金属排序。
4. Reactions of Metals with Dilute Acids | 金属与稀酸的反应
Most metals above hydrogen in the reactivity series react with dilute acids to produce a salt and hydrogen gas. The rate of bubbling indicates the metal's relative reactivity.
反应性序列中排在氢以上的大多数金属能与稀酸反应，生成盐和氢气。气泡产生的速率指示金属的相对活泼程度。
General word equation: metal + acid → salt + hydrogen. For example, magnesium with hydrochloric acid: Mg + 2HCl → MgCl₂ + H₂.
一般文字方程式：金属 + 酸 → 盐 + 氢气。例如，镁与盐酸的反应：Mg + 2HCl → MgCl₂ + H₂。
The reactivity trend is clear: potassium reacts explosively with acid (too dangerous for schools), sodium reacts vigorously, magnesium fizzes rapidly, zinc fizzes moderately, iron fizzes slowly, and copper does not react. These observations help students deduce the order of reactivity.
反应性趋势很明显：钾与酸发生爆炸性反应（对学校来说太危险），钠反应剧烈，镁迅速冒泡，锌中等程度冒泡，铁缓慢冒泡，铜则不反应。这些观察有助于学生推断反应性顺序。
Hydrochloric acid and sulfuric acid are commonly used. The salts formed depend on the acid: chlorides from HCl, sulfates from H₂SO₄. Equations must be balanced and state symbols added as required by Edexcel mark schemes.
常用的是盐酸和硫酸。生成的盐取决于酸的类型：盐酸生成氯化物，硫酸生成硫酸盐。必须配平方程式，并按 Edexcel 评分方案的要求添加状态符号。
5. Displacement Reactions | 置换反应
A more reactive metal will displace a less reactive metal from a solution of its salt. This is a key working principle of the reactivity series.
较活泼的金属能将较不活泼的金属从其盐溶液中置换出来。这是反应性序列的一个核心工作原理。
Example: Zinc + copper(II) sulfate → zinc sulfate + copper. Zn + CuSO₄ → ZnSO₄ + Cu. The blue colour of CuSO₄ solution fades, and a reddish‑brown deposit of copper metal forms on the zinc strip.
示例：锌 + 硫酸铜(II) → 硫酸锌 + 铜。Zn + CuSO₄ → ZnSO₄ + Cu。CuSO₄ 溶液的蓝色逐渐褪去，锌片上附着红褐色的铜沉淀。
Displacement reactions serve as excellent practical evidence for determining the reactivity order. A classic classroom experiment involves placing different metal strips (Mg, Zn, Fe, Cu) in separate solutions of MgSO₄, ZnSO₄, FeSO₄, CuSO₄ and observing colour changes or deposits.
置换反应是确定反应性顺序的极佳实验证据。一个经典的课堂实验是将不同的金属条（Mg、Zn、Fe、Cu）分别放入 MgSO₄、ZnSO₄、FeSO₄、CuSO₄ 溶液中，观察颜色变化或沉积物。
The thermite reaction between aluminium and iron(III) oxide is an important industrial displacement: 2Al + Fe₂O₃ → Al₂O₃ + 2Fe. It demonstrates that aluminium is more reactive than iron, and is used to weld railway tracks.
铝与氧化铁(III)之间的铝热反应是一个重要的工业置换反应：2Al + Fe₂O₃ → Al₂O₃ + 2Fe。它证明铝比铁更活泼，可用于焊接铁轨。
6. Reactivity and Extraction Methods | 反应性与提取方法
The method used to extract a metal from its ore depends on its position in the reactivity series. Highly reactive metals are harder to reduce and require powerful extraction techniques.
从矿石中提取金属的方法取决于其在反应性序列中的位置。高活泼性金属更难被还原，需要更强大的提取技术。
Metals more reactive than carbon, such as potassium, sodium, calcium, magnesium, and aluminium, are extracted by electrolysis of their molten compounds. For example, aluminium is extracted by electrolysis of molten aluminium oxide (Al₂O₃) dissolved in cryolite.
比碳更活泼的金属，如钾、钠、钙、镁和铝，是通过电解其熔融化合物来提取的。例如，铝是通过电解溶解在冰晶石中的熔融氧化铝（Al₂O₃）来提取的。
Metals below carbon but above hydrogen, such as zinc and iron, can be extracted by reduction with carbon or carbon monoxide. In a blast furnace, iron(III) oxide is reduced: Fe₂O₃ + 3CO → 2Fe + 3CO₂.
位于碳以下但氢以上的金属，如锌和铁，可通过碳或一氧化碳还原提取。在鼓风炉中，氧化铁(III)被还原：Fe₂O₃ + 3CO → 2Fe + 3CO₂。
Metals below hydrogen, such as copper and silver, can be obtained simply by heating their ores in air (roasting) or by displacement from solutions. Copper can be extracted from copper(II) oxide by heating with carbon: 2CuO + C → 2Cu + CO₂.
位于氢以下的金属，如铜和银，只需在空气中加热矿石（焙烧）或从溶液中置换即可获得。铜可通过炭热还原氧化铜(II)来提取：2CuO + C → 2Cu + CO₂。
7. Reactivity Series and Corrosion | 反应性序列与腐蚀
Corrosion is the gradual destruction of a metal by reaction with substances like oxygen and water. The more reactive a metal, the more readily it corrodes, although a protective oxide layer can sometimes slow further corrosion.
腐蚀是金属因与氧气和水等物质反应而逐渐毁坏的过程。金属越活泼，越容易被腐蚀，但有时保护性氧化层可以减缓进一步的腐蚀。
Iron rusts in the presence of oxygen and water to form hydrated iron(III) oxide. Rusting is an electrochemical process that can be explained using the reactivity series; iron loses electrons more easily than less reactive metals.
铁在有氧气和水的条件下生锈，形成水合氧化铁(III)。锈蚀是一个电化学过程，可以用反应性序列解释；铁比活性较低的金属更容易失去电子。
Sacrificial protection uses a more reactive metal (e.g., zinc or magnesium) attached to steel to prevent rusting. The zinc preferentially corrodes instead of the iron, acting as a 'sacrificial anode'. This is the principle behind galvanising.
牺牲保护法利用附着在钢上的更活泼金属（如锌或镁）来防止生锈。锌优先被腐蚀而不是铁，充当“牺牲阳极”。镀锌的原理即基于此。
Less reactive metals like gold, silver, and platinum are resistant to corrosion, which is why they are used in jewellery and electrical contacts. Understanding the reactivity series helps engineers select materials and design protection strategies.
活性较低的金属如金、银和铂耐腐蚀，因此它们被用于珠宝和电接触点。理解反应性序列有助于工程师选择材料和设计防护策略。
8. Experimental Determination of Reactivity | 反应性的实验测定
IGCSE students often design experiments to construct a reactivity series using temperature changes or reaction rates. One common method involves adding a fixed mass of metal powder to a known volume of copper(II) sulfate solution and measuring the maximum temperature rise.
IGCSE 学生经常设计实验，通过温度变化或反应速率来构建反应性序列。一种常见方法是将固定质量的金属粉末加入已知体积的硫酸铜(II)溶液中，并测量最高温升。
The larger the temperature rise, the more reactive the metal, because the displacement reaction is more exothermic. For instance, magnesium causes a much greater temperature increase than iron or zinc.
温升越大，金属越活泼，因为置换反应的放热更剧烈。例如，镁引起的温升比铁或锌大得多。
Key control variables include: mass of metal, volume and concentration of copper sulfate solution, initial temperature, and surface area of metal (same powder form). Safe handling of exothermic reactions and use of a thermometer accurate to 0.1 °C are essential.
关键控制变量包括：金属质量、硫酸铜溶液体积和浓度、初始温度以及金属表面积（相同粉末形态）。安全处理放热反应以及使用精确到 0.1 °C 的温度计至关重要。
The results can be plotted on a bar chart, and the reactivity order deduced from the temperature changes. This practical is a core investigation in the Edexcel IGCSE Science specification and frequently tested in written papers.
结果可以绘制为条形图，并根据温度变化推断反应性顺序。此项实验是 Edexcel IGCSE 科学课程大纲中的核心探究活动，常在笔试中考查。
9. Using the Reactivity Series to Predict Reactions | 利用反应性序列预测反应
If you know the relative positions of metals, you can predict whether a displacement reaction will occur. A metal will displace any metal ion below it in the series from a solution.
如果你知道金属的相对位置，就能预测是否会发生置换反应。一种金属能将溶液中任何排在其后面的金属离子置换出来。
Example: Will iron displace zinc from zinc sulfate solution? Iron is below zinc, so no reaction. Will zinc displace copper from copper chloride? Yes, because zinc is above copper. The ability to make these predictions is essential for answering exam questions correctly.
示例：铁能否从硫酸锌溶液中置换出锌？铁排在锌之后，因此不反应。锌能否从氯化铜中置换出铜？可以，因为锌排在铜之前。做出此类预测的能力对正确回答考题至关重要。
Redox interpretation: Displacement reactions are redox reactions. The more reactive metal loses electrons (oxidation) and the less reactive metal ion gains electrons (reduction). Write ionic equations to show electron transfer, e.g., Zn + Cu²⁺ → Zn²⁺ + Cu.
氧化还原解释：置换反应是氧化还原反应。较活泼的金属失去电子（氧化），较不活泼的金属离子得到电子（还原）。书写离子方程式以展示电子转移，例如 Zn + Cu²⁺ → Zn²⁺ + Cu。
Contexts such as choosing a container for a corrosive chemical or designing a heating element benefit from reactivity series knowledge. For instance, aluminium is not used with alkaline foods because it reacts, whereas stainless steel (containing iron, chromium, nickel) is more resistant.
选择储存腐蚀性化学品的容器或设计加热元件等实际场景，都能受益于反应性序列知识。例如，铝不与碱性食物一同使用，因为它会反应；而不锈钢（含铁、铬、镍）则更加耐腐蚀。
10. Summary and Exam Tips | 总结与考试技巧
Mastering the reactivity series involves knowing the order, understanding the underlying electron‑transfer concept, and being able to write balanced equations for reactions with water, acids, and salt solutions. Edexcel IGCSE papers expect you to link reactivity to extraction methods and corrosion prevention.
掌握反应性序列需要记住顺序、理解背后的电子转移概念，并能够为与水、酸和盐溶液的反应书写配平的方程式。Edexcel IGCSE 的试卷要求你将反应性与提取方法和腐蚀防护联系起来。
Common mistakes include forgetting to balance equations, confusing the position of carbon and hydrogen, and misidentifying the products of metal‑water reactions (e.g., writing an oxide instead of hydroxide). Use state symbols consistently: (s) solid, (l) liquid, (g) gas, (aq) aqueous.
常见错误包括：忘记配平方程式、混淆碳和氢的位置、错误判断金属与水反应的产物（例如写成了氧化物而非氢氧化物）。请始终使用状态符号：(s) 固体、(l) 液体、(g) 气体、(aq) 溶液。
Practice drawing labelled diagrams of experimental setups, plotting graphs, and explaining anomalies using concepts of reactivity and exothermicity. Always refer to the reactivity series when discussing rusting, extraction, or displacement in extended‑answer questions.
练习绘制实验装置标签图、绘制图表，并利用反应性和放热概念解释异常现象。在扩展性回答题中讨论生锈、提取或置换时，始终要引用反应性序列。
Published by TutorHao | Science 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