📚 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
Misconceptions in science can seriously hinder progress in WJEC Year 10. By identifying and correcting these common errors, students can deepen their understanding and boost exam performance. This article highlights frequent misunderstandings across biology, chemistry and physics and provides clear corrections.
科学中的误区会严重阻碍 WJEC 十年级学生的学习进展。通过识别并纠正这些常见错误，学生可以加深理解并提高考试成绩。本文重点介绍生物学、化学和物理学中经常出现的错误观念，并提供清晰的纠正方法。
1. Respiration and Photosynthesis | 呼吸与光合作用
Many students think plants only respire at night, confusing the absence of photosynthesis with the absence of respiration. In reality, plants respire continuously, day and night, like all aerobic organisms. Respiration releases energy from glucose in every living cell, while photosynthesis occurs only in light to synthesise glucose. Another mistake is treating the two processes as exact opposites that cancel out. Although their overall equations are reversed, they involve different organelles, enzymes and energy transfers.
许多学生认为植物只在夜间呼吸，误以为没有光合作用就没有呼吸作用。实际上，植物与所有好氧生物一样，昼夜不停地进行呼吸作用。呼吸作用在所有活细胞中释放葡萄糖的能量，而光合作用仅在光照下合成葡萄糖。另一个错误是把这两个过程当作简单的逆反应相互抵消。尽管总方程式相反，但它们涉及不同的细胞器、酶和能量转换。
- English: 'Photosynthesis takes place in mitochondria.' Correction: Photosynthesis occurs in chloroplasts, respiration in mitochondria.
中文：“光合作用发生在线粒体。”纠正：光合作用发生在叶绿体，呼吸作用发生在线粒体。 - English: 'Plants take in food from the soil.' Correction: Plants make glucose via photosynthesis; roots absorb water and minerals, not food.
中文：“植物从土壤中吸收食物。”纠正：植物通过光合作用制造葡萄糖；根吸收的是水和矿物质，不是食物。
Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Aerobic respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
2. Mass and Weight | 质量与重量
Students frequently use 'weight' and 'mass' interchangeably, thinking that a 50 kg person 'weighs' 50 kg. Weight is a force measured in newtons (N), caused by gravity acting on mass. Mass is the amount of matter, measured in kilograms (kg), and does not change with location. An astronaut has the same mass on the Moon but only one-sixth of Earth weight. Another myth is that objects in orbit are weightless because there is no gravity; in fact, gravity is still present, but the free-fall condition creates apparent weightlessness.
学生经常混用“重量”和“质量”，认为一个 50 千克的人“重” 50 千克。重量是一种力，单位是牛顿（N），由重力作用在质量上产生。质量是物质的多少，单位是千克（kg），不随位置变化。宇航员在月球上的质量不变，但重量只有地球的六分之一。另一个误解是在轨道上物体会因为没有重力而失重；事实上，重力仍然存在，自由落体状态造成了表观失重。
- English: 'A balance measures weight.' Correction: A balance compares mass; a spring scale measures weight.
中文：“天平称量的是重量。”纠正：天平比较的是质量；弹簧秤测量的是重量。 - English: 'Mass changes when you go into space.' Correction: Mass is invariant; weight varies with gravitational field strength.
中文：“进入太空后质量会改变。”纠正：质量是不变的；重量随引力场强度变化。
Weight (N) = mass (kg) × gravitational field strength (N/kg)
3. Current in Circuits | 电路中的电流
A pervasive misconception is that electric current is 'used up' by components, so less current returns to the battery. In a series circuit, current (the rate of flow of charge) is the same at every point. Energy is transferred from the battery to the components, but the charge carriers themselves are not consumed. The rope-loop model helps: pulling a rope around a circuit, friction at 'bulbs' makes it hard to pull, but the rope speed is constant everywhere. Current is measured in amperes (A), and the ammeter connected in series shows identical readings anywhere in the loop.
一个普遍的误区是电流会被用电器“消耗”，从而回到电池的电流会变小。在串联电路中，电流（电荷流动的速率）在各点都相等。能量从电池转移到元器件，但电荷本身并未被消耗。绳圈模型有助于理解：拉着一根绳子绕电路转动，在“灯泡”处有摩擦，但绳子的速度处处恒定。电流的单位是安培（A），串联的电流表在任何位置读数都相同。
- English: 'The battery stores electric current that runs out.' Correction: The battery supplies energy to drive charges; it does not store ready-made current.
中文：“电池储存电流，电流会用完。”纠正：电池提供能量来驱动电荷；它并不储存现成的电流。 - English: 'Voltage is the speed of electrons.' Correction: Voltage is a measure of energy per unit charge (potential difference).
中文：“电压是电子的速度。”纠正：电压是单位电荷能量的量度（电势差）。
4. Atoms and Molecules | 原子与分子
Students often believe atoms are the smallest particles and cannot be split, or that all atoms are identical. Atoms consist of protons, neutrons and electrons, and can be split in nuclear reactions. Different elements have different numbers of protons. A molecule is a group of two or more atoms chemically bonded; an atom of oxygen (O) is not the same as a molecule of oxygen (O₂). Another common error is thinking that compounds are just mixtures of atoms; in a compound, atoms are chemically combined in fixed proportions and have different properties from their constituent elements.
学生通常认为原子是最小的粒子且不可分割，或者所有原子都一样。原子由质子、中子和电子组成，在核反应中可以被分裂。不同元素的质子数不同。分子是由两个或两个以上原子通过化学键结合而成的；氧原子（O）和氧分子（O₂）不是一回事。另一个常见错误是认为化合物只是原子的混合物；实际上，化合物中原子以固定比例化学结合，性质与其组成元素截然不同。
- English: 'Water is made of hydrogen and oxygen atoms mixed together.' Correction: Water molecules contain two hydrogen atoms bonded to one oxygen atom.
中文：“水是由氢原子和氧原子混合而成的。”纠正：水分子含有两个氢原子和一个氧原子通过化学键连接。 - English: 'All atoms of an element are exactly the same.' Correction: Isotopes have the same number of protons but different numbers of neutrons.
中文：“同种元素的所有原子完全相同。”纠正：同位素质子数相同，但中子数不同。
5. Digestion and Absorption | 消化与吸收
A common belief is that digestion happens only in the stomach, and absorption occurs only in the small intestine. Digestion actually begins in the mouth, where amylase starts breaking down starch. The stomach digests proteins with pepsin and hydrochloric acid. The small intestine completes digestion with enzymes from the pancreas and absorbs most nutrients. The large intestine absorbs water, not nutrients. Another error is that food is absorbed directly into the blood from the stomach; only substances like alcohol and some drugs are absorbed there. The products of digestion are small, soluble molecules that can pass through the villi into the bloodstream.
一个常见观点是消化只在胃里发生，吸收只在小肠进行。实际上，消化从口腔开始，淀粉酶开始分解淀粉。胃用胃蛋白酶和盐酸消化蛋白质。小肠在胰酶的作用下完成消化，并吸收大部分营养。大肠吸收水分，不是营养物。另一个错误是食物从胃直接吸收到血液中；只有酒精和一些药物能在胃里被吸收。消化的产物是小而可溶的分子，能穿过小肠绒毛进入血液。
- English: 'Enzymes are alive and get used up.' Correction: Enzymes are biological catalysts, not living, and can be reused.
中文：“酶是活的，会被消耗掉。”纠正：酶是生物催化剂，不是活的，可以重复使用。 - English: 'Fibre is digested to give energy.' Correction: Fibre (cellulose) cannot be digested by humans but aids bowel movement.
中文：“纤维被消化提供能量。”纠正：纤维（纤维素）不能被人体消化，但有助于肠道蠕动。
6. Heat and Temperature | 热量与温度
Many learners confuse heat and temperature, saying 'the coffee has a lot of heat' when they mean high temperature. Temperature is a measure of the average kinetic energy of particles, while heat is the transfer of thermal energy from a hotter to a cooler object. A huge iceberg has a much lower temperature than a cup of tea, but it contains far more internal energy because of its mass. The misconception that temperature alone determines heat content leads to errors when discussing specific heat capacity and phase changes.
许多学生混淆热量和温度，当他们说“咖啡有很多热量”时，其实是指温度高。温度是粒子平均动能的量度，而热量是从高温物体向低温物体传递的热能。一座巨大的冰山温度远低于一杯茶，但由于质量庞大，其内能要多得多。仅仅用温度高低来判断热量多少
Published by TutorHao | Year 10 Science Revision Series | aleveler.com
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