📚 Using the Reactivity Series: Extracting Metals from Their Ores | 利用反应性系列：从矿石中提取金属
Metals are essential materials, but most do not appear in the ground as shiny, pure elements. Instead, they are chemically locked inside rocks called ores. To obtain iron, aluminium, copper and other useful metals, we must choose an extraction method. The reactivity series is the key tool that tells us which method to use and why.
金属是必不可少的材料，但大多数金属并不是以闪亮的纯元素形式存在于地下。相反，它们以化学方式被锁在称为矿石的岩石中。为了获得铁、铝、铜和其他有用金属，我们必须选择提取方法。反应性系列是告诉我们使用哪种方法以及为什么的关键工具。
1. Metals from the Ground | 从地下获取金属
Most metals in Earth's crust exist as compounds, not as free elements. Only very unreactive metals such as gold are sometimes found as pure metal.
地壳中的大多数金属以化合物形式存在，而不是游离态单质。只有极不活泼的金属（如金）有时会以纯金属形式存在。
A metal compound found naturally in rock is usually an oxide or a sulfide. We call a rock an ore if it contains enough metal compound to make mining and extraction profitable.
天然存在于岩石中的金属化合物通常是氧化物或硫化物。如果岩石含有足够多的金属化合物、使开采和提取有利可图，我们就称之为矿石。
2. What Is an Ore? | 什么是矿石
An ore is a naturally occurring rock that contains a useful amount of a metal compound. For example, haematite is an iron ore containing iron(III) oxide, Fe₂O₃.
矿石是一种天然存在的岩石，含有具有利用价值的金属化合物。例如，赤铁矿是一种铁矿石，含有氧化铁 Fe₂O₃。
Ores are non-renewable resources. Removing the metal usually involves chemical change, not just physical separation.
矿石是不可再生资源。从矿石中提取金属通常涉及化学变化，而不仅仅是物理分离。
3. The Reactivity Series | 反应性系列
The reactivity series ranks metals from most reactive to least reactive. A common KS3 order is: potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, copper, silver, gold.
反应性系列按照从最活泼到最不活泼的顺序排列金属。KS3 常见顺序为：钾、钠、钙、镁、铝、锌、铁、铅、铜、银、金。
More reactive metals form more stable compounds. This means their compounds are harder to break apart during extraction.
越活泼的金属形成的化合物越稳定。这意味着在提取过程中，这些化合物更难分解。
4. Why Reactivity Controls Extraction | 为什么反应性决定提取方法
The more reactive a metal is, the more strongly it holds on to oxygen or other elements. Therefore, extracting a very reactive metal requires a more powerful method.
金属越活泼，它与氧或其他元素结合得就越牢固。因此，提取非常活泼的金属需要更强大的方法。
Less reactive metals need less energy or no chemical reaction at all. This pattern explains the three main extraction routes used at KS3.
较不活泼的金属所需能量较少，甚至不需要化学反应。这一规律解释了 KS3 阶段使用的三种主要提取路线。
5. Native Metals: No Extraction Needed | 天然金属：无需提取
Gold and sometimes silver and copper occur as native metals. They are so unreactive that they do not readily form compounds in nature.
金以及有时银和铜以天然金属形式存在。它们极不活泼，在自然界中不易形成化合物。
Native metals can be separated from rock by physical methods such as panning for gold. No chemical reaction is needed.
天然金属可以用物理方法从岩石中分离，例如淘金。不需要化学反应。
6. Heating Alone: Decomposition of Unstable Oxides | 仅加热：不稳定氧化物的分解
Some metal compounds near the bottom of the reactivity series are unstable when heated. Silver oxide, for example, breaks down into silver and oxygen simply by heating.
反应性系列底部附近的一些金属化合物受热不稳定。例如，氧化银只需加热就会分解成银和氧气。
2Ag₂O → 4Ag + O₂
This works only for very unreactive metals. More reactive metals have oxides that are too stable to decompose by heat alone.
这种方法只适用于极不活泼的金属。较活泼金属的氧化物太稳定，无法仅靠加热分解。
7. Reduction with Carbon | 用碳还原
For metals in the middle of the reactivity series, such as zinc, iron, lead and copper, we can extract them by heating their oxides with carbon. Carbon is more reactive than these metals, so it takes the oxygen away.
对于反应性系列中部的金属，如锌、铁、铅和铜，我们可以将它们的氧化物与碳一起加热来提取。碳比这些金属更活泼，因此会夺走氧。
This reaction is called reduction because the metal oxide loses oxygen. The carbon is oxidised to carbon dioxide.
这个反应称为还原反应，因为金属氧化物失去氧。碳则被氧化成二氧化碳。
2CuO + C → 2Cu + CO₂
8. Carbon's Position in the Series | 碳在反应性系列中的位置
Carbon is not a metal, but it is placed in the reactivity series between aluminium and zinc. This helps us predict which metal oxides carbon can reduce.
碳不是金属，但它在反应性系列中位于铝和锌之间。这有助于我们预测碳能还原哪些金属氧化物。
Carbon can reduce oxides of zinc, iron, lead and copper because they are less reactive than carbon. It cannot reduce oxides of aluminium, magnesium, sodium, calcium or potassium.
碳可以还原锌、铁、铅和铜的氧化物，因为它们不如碳活泼。碳不能还原铝、镁、钠、钙或钾的氧化物。
This rule is a key exam idea: carbon is the reducing agent only for metals below it in the series.
这条规则是重要考点：碳只能作为反应性系列中位于其下方金属的还原剂。
9. Electrolysis of Molten Compounds | 熔融化合物的电解
Very reactive metals, such as aluminium, magnesium, sodium, calcium and potassium, form extremely stable compounds. Carbon cannot remove oxygen from their oxides.
非常活泼的金属，如铝、镁、钠、钙和钾，会形成极稳定的化合物。碳无法从它们的氧化物中除去氧。
These metals are extracted by electrolysis. The metal compound is melted, and an electric current passes through it. The metal ions are reduced to metal atoms at the negative electrode.
这些金属通过电解提取。将金属化合物熔化，然后通入电流。金属离子在负极被还原为金属原子。
Electrolysis is powerful but expensive because it uses large amounts of electricity. This is why extracting aluminium costs more than extracting iron.
电解法效率高但成本昂贵，因为需要消耗大量电能。这就是提取铝比提取铁成本更高的原因。
2Al₂O₃ → 4Al + 3O₂
10. Method Comparison Table | 方法比较表
The table below summarises the extraction method for common metals. Notice how reactivity falls from top to bottom.
下表总结了常见金属的提取方法。请注意反应性从上到下逐渐降低。
| Metal / 金属 | Reactivity / 反应性 | Method / 方法 |
|---|---|---|
| Potassium, sodium, calcium, magnesium, aluminium / 钾、钠、钙、镁、铝 | Very reactive / 非常活泼 | Electrolysis of molten compound / 电解熔融化合物 |
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