📚 Cross-Disciplinary Integrated Questions in Year 7 OCR Chemistry | 跨学科综合题型训练
In Year 7 OCR Chemistry, you will come across questions that do not treat chemistry as a standalone subject. Instead, they blend chemistry with physics, biology or earth science. These cross-disciplinary questions test your ability to link ideas across the whole of science. This revision guide offers practice in recognising these connections and shows you how to answer integrated problems with confidence.
在 Year 7 OCR 化学中，你会遇到不把化学当作独立学科的题目。这些题目将化学与物理、生物或地球科学融合在一起。这类跨学科综合题考察你用全局科学思维连接不同概念的能力。本复习指南将帮助你识别这些联系，并教你如何自信地解答综合问题。
1. Particle Model and Heat Transfer | 粒子模型与热传递
The particle model in chemistry explains that all substances are made of tiny, constantly moving particles. In physics, heat transfer occurs when energy moves from a hotter object to a cooler one. These two ideas combine beautifully when you explain everyday observations like a metal spoon heating up in a cup of tea.
化学中的粒子模型告诉我们，所有物质都由不断运动着的微小粒子组成。物理中，热传递指的是能量从较热的物体转移到较冷的物体。当你解释金属勺在热茶中变热这类日常现象时，这两套概念可以很好地结合起来。
Example question: Explain why a metal spoon left in a cup of hot tea becomes hot, using ideas about particles and energy.
例题：请用粒子和能量的观点解释为什么金属勺放在一杯热茶中会变热。
Answer: The hot tea has more thermal energy than the spoon. Energy transfers from the tea to the cooler metal. The particles on the spoon’s surface gain kinetic energy and start to vibrate more vigorously. In metals, free electrons move quickly and collide with other particles, passing the kinetic energy along the spoon. This continues until the whole spoon reaches a uniform temperature.
答案：热茶比勺子拥有更多的热能。能量从茶传递到较冷的金属。勺子表面的粒子获得动能，振动变得更剧烈。在金属中，自由电子可以快速移动，与其他粒子碰撞，将动能沿勺子传递，直到整个勺子达到均匀的温度。
2. Changes of State and the Water Cycle | 物态变化与水循环
The water cycle involves evaporation, condensation and precipitation. Chemistry explains these changes of state using the particle model. Evaporation happens when liquid water particles gain enough energy to escape as a gas. Condensation occurs when water vapour particles lose energy and come closer together to form liquid droplets. This connects directly to geography and the weather.
水循环涉及蒸发、凝结和降水。化学用粒子模型解释这些状态变化。当液态水颗粒获得足够能量变成气体逸出时，就发生了蒸发。当水蒸气颗粒失去能量、相互靠近形成液滴时，就发生了凝结。这直接联系到地理和天气。
Example question: Describe the role of evaporation and condensation in the water cycle, using the particle model.
例题：运用粒子模型描述蒸发和凝结在水循环中的作用。
Answer: The Sun heats water in oceans and lakes. Liquid water particles gain kinetic energy, overcome the forces holding them together and escape as water vapour (evaporation). As the moist air rises and cools, water vapour particles lose energy. They slow down, move closer together and form liquid droplets around dust particles, creating clouds (condensation). Eventually, the droplets become large enough to fall as rain.
答案：太阳加热海洋和湖泊中的水。液态水颗粒获得动能，克服相互间的吸引力，逸散成水蒸气（蒸发）。潮湿空气上升冷却时，水蒸气颗粒失去能量，运动减慢，相互靠近，围绕尘埃颗粒形成液态小水滴，组成云（凝结）。最终，水滴变得足够大，以雨的形式降落。
3. Atoms, Elements and the Earth’s Composition | 原子、元素与地球组成
The Earth’s crust is made of a relatively small number of chemical elements. Oxygen is the most abundant, making up nearly half the mass, but it almost always exists combined with other elements in compounds such as silicon dioxide (SiO₂). Chemists use the idea of reactivity to explain why free, gaseous oxygen is rare in rocks.
地壳由较少的几种化学元素组成。氧是最丰富的元素，差不多占了质量的一半，但它几乎总是与其他元素化合，存在于二氧化硅 (SiO₂) 等化合物中。化学家用反应性的概念来解释为什么岩石中游离的气态氧非常稀少。
Example question: The most abundant element in the Earth’s crust is oxygen. Explain why we find oxygen mainly in compounds inside rocks, not as a separate gas.
例题：地壳中最丰富的元素是氧。请解释为什么我们在岩石中发现的氧主要以化合物形式存在，而不是单独的氧气。
Answer: Oxygen is a highly reactive non-metal. It readily forms chemical bonds with many other elements, especially silicon, aluminium and iron. For instance, oxygen combines with silicon to form silicon dioxide, a major component of sand and granite. Because of its reactivity, any free oxygen gas near the Earth’s surface long ago became locked up in solid compounds.
答案：氧是一种高反应性的非金属。它很容易与许多其他元素（尤其是硅、铝和铁）形成化学键。例如，氧与硅结合生成二氧化硅，这是沙子和花岗岩的主要成分。由于氧的高反应性，很久以前地球表面附近的任何游离氧气气体都被固定到了固体化合物中。
4. Chemical Reactions and Energy Changes | 化学反应与能量变化
Many chemical reactions involve energy transfers, linking chemistry with physics. Exothermic reactions release heat to the surroundings, while endothermic reactions absorb heat. A common example is the reaction of iron with oxygen used in disposable hand warmers.
许多化学反应都涉及能量转移，这就将化学与物理联系了起来。放热反应向环境释放热量，而吸热反应则吸收热量。一次性暖手包中用到的铁与氧气的反应就是一个常见例子。
Example question: A hand warmer contains iron powder that reacts with oxygen to form iron oxide, releasing heat. Explain this process using chemical and energy ideas.
例题：一个暖手包含有铁粉，与氧气反应生成氧化铁并释放热量。请用化学和能量观点解释这个过程。
Answer: The reaction is: iron + oxygen → iron oxide. This is an exothermic reaction. Chemical bonds in the iron and oxygen store chemical energy. When the reaction happens, new bonds form in iron oxide, and the stored energy is released as thermal energy. The heat then transfers to your hands, warming them up.
答案：该反应为：铁 + 氧气 → 氧化铁。这是一个放热反应。铁和氧气中的化学键储存着化学能。当反应发生时，氧化铁中形成了新的化学键，储存的能量以热能的形式释放出来。然后热量传递到你的手上，使手变暖。
5. Acids, Alkalis and the Environment | 酸、碱与环境
Acid rain is a serious environmental problem that requires an understanding of both chemistry and geography. Burning fossil fuels releases sulfur dioxide (SO₂) and nitrogen oxides. These gases dissolve in rain water, forming acidic solutions with a low pH that can damage ecosystems.
酸雨是一个严重的环境问题，需要结合化学和地理知识来理解。燃烧化石燃料会释放二氧化硫 (SO₂) 和氮氧化物。这些气体溶解在雨水中，形成低pH的酸性溶液，会破坏生态系统。
Example question: Explain how burning coal can lead to acid rain and how this affects aquatic life.
例题：解释燃烧煤如何导致酸雨，以及酸雨如何影响水生生物。
Answer: Coal contains sulfur impurities. When coal burns, sulfur reacts with oxygen: S + O₂ → SO₂. Sulfur dioxide then dissolves in water droplets in clouds: SO₂ + H₂O → H₂SO₃ (sulfurous acid). This acid rain lowers the pH of lakes and rivers. Many aquatic organisms, such as fish and insects, cannot survive in very acidic water, and the whole food web is disturbed.
答案：煤中含有硫杂质。煤燃烧时，硫与氧气反应：S + O₂ → SO₂。然后二氧化硫溶解在云中的小水滴里：SO₂ + H₂O → H₂SO₃（亚硫酸）。这种酸雨降低了湖泊和河流的pH值。许多水生生物，如鱼和昆虫，无法在强酸性水体中生存，整个食物网因此受到破坏。
6. Combustion and Respiration | 燃烧与人体生理
Combustion (burning) and aerobic respiration are both chemical processes that release energy. In chemistry, combustion is a rapid reaction of a fuel with oxygen. In biology, respiration is a slower, controlled set of reactions inside cells. Comppararing the two helps you see how science disciplines overlap.
燃烧和需氧呼吸都是释放能量的化学过程。在化学中，燃烧是燃料与氧气发生的快速反应。在生物学中，呼吸作用是细胞内一系列受控的、较慢的反应。比较两者能帮助你看到不同科学学科是如何重叠的。
Example question: Compare the burning of glucose in air with respiration in your body. Mention reactants and products.
例题：比较葡萄糖在空气中的燃烧与你体内的呼吸作用。提及反应物和产物。
Answer: The overall word equation for both is: glucose + oxygen → carbon dioxide + water (+ energy). Combustion is a rapid, uncontrolled reaction that releases heat and light. Respiration is a slow, step‑by‑step process controlled by enzymes, releasing energy gradually for the body to use. Both processes transfer energy and produce the same final products.
答案：两者总体的文字方程式都是：葡萄糖 + 氧气 → 二氧化碳 + 水 (+ 能量)。燃烧是一个快速、不受控的反应，释放出热和光。呼吸作用是一个缓慢、逐步、由酶控制的过程，逐步释放能量供身体使用。两个过程都转移能量，并产生相同的最终产物。
7. Separation Techniques in
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