📚 Year 10 WJEC Science: Common Misconceptions and How to Correct Them | Year 10 WJEC 科学：常见误区与纠正方法
In Year 10 WJEC Science, students often bring prior ideas that conflict with scientific models. These misconceptions can block deep understanding across biology, chemistry and physics. This article identifies the most frequent errors and offers clear corrections, each explained in paired English and Chinese to support bilingual learners. Mastering these distinctions will sharpen your exam answers and build lasting scientific literacy.
在 Year 10 WJEC 科学学习中，学生常常带着与科学模型相悖的前概念进入课堂。这些误区会阻碍对生物、化学和物理的深入理解。本文总结了最常见的错误并提供了清晰的纠正，每一点都用中英双语配对讲解，帮助双语学习者。掌握这些区别能让你的考试答案更精准，并建立持久的科学素养。
1. Breathing vs. Respiration | 呼吸与呼吸作用的区别
Many students think 'breathing' and 'respiration' are the same process because both involve oxygen and carbon dioxide.
许多学生认为“呼吸”和“呼吸作用”是同一个过程，因为两者都涉及氧气和二氧化碳。
Breathing (ventilation) is the physical movement of air into and out of the lungs, driven by the diaphragm and rib muscles. Respiration is a chemical process that occurs inside every living cell, where glucose reacts with oxygen to release energy (ATP), producing carbon dioxide and water as waste.
呼吸（通气）是空气进出肺部的物理运动，由膈肌和肋骨肌肉驱动。呼吸作用是在每个活细胞内部发生的化学过程，葡萄糖与氧气反应释放能量（ATP），并产生二氧化碳和水作为废物。
. This reaction is not visible as moving air; it is controlled by enzymes in mitochondria.
有氧呼吸的方程式：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O（+ 能量）。这个反应并不能被看作空气的流动；它是在线粒体中由酶控制的。
Key correction: Use 'ventilation' for the mechanical act of breathing, and 'cellular respiration' for the energy‑releasing reaction.
关键纠正：用“通气”表示呼吸的机械动作，用“细胞呼吸作用”表示释放能量的反应。
2. Plants Respire Only at Night | 植物只在夜间进行呼吸作用
Because photosynthesis produces oxygen during the day, many learners assume plants only respire in darkness.
由于光合作用在白天产生氧气，许多学习者认为植物只在黑暗中进行呼吸作用。
Plants respire 24 hours a day, just like animals. Respiration supplies energy for growth, active transport and reproduction. During daylight, photosynthesis usually outpaces respiration, so the net gas exchange is oxygen release and carbon dioxide uptake. At night, photosynthesis stops, so only respiration is detectable – giving the false impression that respiration suddenly switches on.
植物和动物一样，一天 24 小时都在进行呼吸作用。呼吸作用为生长、主动运输和繁殖提供能量。白天，光合作用的速度通常超过呼吸作用，因此净气体交换是释放氧气和吸收二氧化碳。夜晚，光合作用停止，只能检测到呼吸作用——这给人一种错误印象，好像呼吸作用突然打开了。
Exam tip: on a graph of gas exchange over 24 hours, the compensation point is where photosynthesis rate equals respiration rate – net exchange is zero.
考试提示：在 24 小时气体交换曲线图上，补偿点是光合作用速率等于呼吸作用速率的时刻——此时净交换为零。
3. Atoms, Molecules and Ions | 原子、分子与离子
Students often use 'atom', 'molecule' and 'ion' interchangeably, especially when writing formulae.
学生常常混用“原子”、“分子”和“离子”，尤其是在写化学式的时候。
An atom is the smallest part of an element that retains its chemical properties (e.g. a single Na atom). A molecule is two or more atoms chemically bonded together, which can be the same element (O₂) or different elements (H₂O). An ion is a charged particle formed when an atom or group of atoms loses or gains electrons (e.g. Na⁺, SO₄²⁻).
原子是保持元素化学性质的最小粒子（例如一个单独的 Na 原子）。分子是两个或更多原子通过化学键结合在一起的粒子，可以是同种元素（O₂）也可以是不同元素（H₂O）。离子是原子或原子团失去或得到电子后形成的带电粒子（例如 Na⁺、SO₄²⁻）。
Misconception: 'NaCl is a molecule.' Correction: sodium chloride is an ionic compound consisting of a giant lattice of Na⁺ and Cl⁻ ions, not discrete molecules.
误区：“NaCl 是一个分子。”纠正：氯化钠是一种离子化合物，由 Na⁺ 和 Cl⁻ 离子组成的巨型晶格，而不是离散的分子。
4. Bond Breaking Releases Energy? | 化学键断裂释放能量？
In everyday language we 'break' things to release energy (e.g. burning wood), leading to the idea that breaking chemical bonds gives out heat.
在日常语言中我们“打碎”东西来释放能量（比如烧木头），这导致了一种误解，即化学键断裂会放出热量。
Bond breaking is always endothermic – it requires an input of energy. Bond making is always exothermic – it releases energy. In an exothermic reaction overall (like combustion), more energy is released when new bonds form in the products than was absorbed to break bonds in the reactants.
化学键的断裂总是吸热的——需要输入能量。化学键的形成总是放热的——释放能量。在一个总反应放热的反应中（如燃烧），生成物中新键形成时释放的能量超过了断裂反应物中旧键所吸收的能量。
Energy level diagrams for exothermic reactions show products lower than reactants because the net energy given out results in a drop in chemical potential energy.
放热反应的能量水平图显示生成物能量低于反应物，因为净释放的能量导致化学势能降低。
5. Mass in Combustion Reactions | 燃烧反应中的质量守恒
When a log burns, the ash left behind is much lighter than the original log. Many students conclude that mass has been lost.
当圆木燃烧时，剩下的灰烬比原来的木头轻得多。许多学生因此得出结论：质量减少了。
The law of conservation of mass states that in a closed system mass remains constant. Burning wood is an open system: carbon dioxide and water vapour escape into the air. If all the gases were captured, the total mass of the products would equal the mass of the original wood plus the oxygen that combined with it.
质量守恒定律指出，在一个封闭系统中质量保持不变。燃烧木头是一个开放系统：二氧化碳和水蒸气逸散到空气中。如果收集所有气体，生成物的总质量将等于原来木头的质量加上与之反应的氧气质量。
Exam answer: 'The mass appears to decrease because gas products escape. In a sealed container the total mass would stay the same.'
考试答案：“质量看起来减少了，是因为气体生成物逃逸了。在密封容器中，总质量会保持不变。”
6. Force Keeps Objects Moving | 力使物体保持运动
Everyday experience suggests you need to keep pushing a trolley to keep it moving. This leads to the Aristotelian idea that a continuous force is necessary for motion.
日常经验表明，你需要不断推着购物车才能让它保持移动。这导致了亚里士多德式的观念：持续的作用力是维持运动所必需的。
Newton's First Law states that an object stays at rest or moves with constant velocity unless a resultant force acts on it. When you stop pushing, friction (a resultant force) slows the trolley down. In space, far from friction, an object given a single push would move forever at constant speed in a straight line.
牛顿第一定律表明，除非有合力作用，否则物体将保持静止或匀速直线运动状态。当你停止推车时，摩擦力（一个合力）使减速。在远离摩擦的太空里，一个被推了一下的物体会永远沿直线匀速运动。
Misconception to correct: 'A force is needed to keep things moving.' Correction: 'A resultant force changes the speed or direction of motion; no net force is needed to maintain constant velocity.'
需要纠正的误区：“需要力来保持物体运动。”纠正：“合力会改变运动的速度或方向；维持匀速不需要净力。”
7. Current is Used Up in a Circuit | 电流在电路中被消耗
A very common model among learners is that electric current leaves the battery, passes through a bulb (where some of it is 'used up') and a reduced current returns.
学习者中一个非常普遍的模型是：电流从电池出发，经过灯泡（一部分被“消耗掉”），然后减少的电流返回。
In a series circuit, current is the same at all points. Charge carriers (electrons) are not used up; they are simply pushed around by the battery's potential difference. Energy is transferred from the battery to components, where it is converted into light and heat. The current remains constant because the number of electrons flowing per second is unchanged.
在串联电路中，各点的电流都相同。电荷载流子（电子）并没有被消耗；它们只是被电池的电位差推动在回路中流动。能量从电池传递到元件，并在那里转化为光和热。电流之所以保持恒定，是因为每秒流过的电子数量没有改变。
Correct model: 'The bulb offers resistance and converts electrical energy, but the charge carriers continue their journey without being lost.'
正确模型：“灯泡提供电阻并转化电能，但电荷载流子继续前行，没有消失。”
8. Heat and Temperature: Same Thing? | 热与温度是一回事吗？
In everyday language we say 'Close the window to keep the heat in', blending the concepts of heat and temperature. Scientifically they are distinct.
在日常语言中，我们说“关上窗户以保持热量”，混用了热和温度的概念。从科学上讲，它们是不同的。
Temperature is a measure of the average kinetic energy of particles in a substance – it is an intensive property, meaning it does not depend on the amount of material. Heat is the thermal energy transferred from a hotter object to a colder one; it is an extensive quantity and depends on mass, specific heat capacity and temperature change.
温度是物质中粒子平均动能的度量——它是一个强度性质，意味着与材料的量无关。热是从较热物体传递到较冷物体的热能；它是一个广延量，取决于质量、比热容和温度变化。
A spark from a firework is at a very high temperature but contains little heat energy, so it does not burn your skin. A bath of warm water at lower temperature contains far more heat energy.
烟花的火花温度非常高，但含有的热量很少，因此不会烧伤皮肤。一浴缸温水温度较低，但含有的热量多得多。
9. Energy in Food Chains | 食物链中的能量流动
When drawing pyramids, students often put the largest bar at the top, thinking top predators get all the energy. In fact, energy decreases at each trophic level.
在画金字塔时，学生常常把最大的横条放在顶部，认为顶级捕食者获得了所有能量。实际上，能量在每一个营养级都减少了。
Only about 10% of the biomass (chemical energy) from one trophic level is converted into biomass in the next level. The rest is lost through respiration, movement, heat, and uneaten parts or waste. This explains why food chains rarely have more than four or five trophic levels – there is not enough energy left to support another level.
从一个营养级到下一个营养级，只有大约 10% 的生物质（化学能）被转化为下一级的生物质。其余的能量通过呼吸作用、运动、热量以及未被吃掉的部分或废物而流失。这就解释了为什么食物链很少超过四到五个营养级——没有足够的能量来支撑更高的层级。
Linked misconception: toxic substances like pesticides show biomagnification – their concentration increases up the food chain, opposite to the flow of energy.
相关的误区：像杀虫剂这样的有毒物质表现出生物放大作用——它们的浓度沿食物链向上递增，与能量的流向相反。
10. Evolution is Just Adaptation | 进化就是适应
Many students believe that individual organisms can evolve during their lifetime to suit the environment – a Lamarckian view, e.g. 'the giraffe stretched its neck to reach high leaves and passed on a longer neck.'
许多学生认为个体生物在一生中可以为了适应环境而进化——这是一种拉马克式的观点，例如“长颈鹿为了够到高处的叶子而伸长脖子，并将长脖子遗传下去”。
Evolution by natural selection works on populations over many generations. Genetic variation exists by random mutation. Individuals with traits that improve survival and reproduction are more likely to pass on their alleles. The frequency of those advantageous alleles increases in the gene pool over time – this is evolution. An individual cannot change its genes by effort.
自然选择驱动的进化作用于种群，跨越许多代。遗传变异由随机突变产生。具有有利于生存和繁殖的性状的个体，更有可能将它们的等位基因传递下去。随着时间的推移，这些有利等位基因在基因库中的频率增加——这就是进化。个体无法通过努力改变其基因。
Exam correction: 'Evolution is a change in allele frequency in a population, not the adaptation of a single organism.'
考试纠正：“进化是种群中等位基因频率的改变，而不是单个生物体的适应。”
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