📚 Year 11 Edexcel Science: Common Misconceptions and How to Fix Them | 爱德思11年级科学：常见误区与纠正方法
Mastering GCSE Science requires not only memorising facts but also overcoming common conceptual misunderstandings. In Year 11, as you prepare for Edexcel exams, identifying and correcting these errors can dramatically boost your performance. This guide highlights ten widespread misconceptions across Biology, Chemistry and Physics, and gives clear corrections with exam-ready explanations.
掌握GCSE科学不仅需要记忆事实，还要克服常见的概念误解。在11年级准备爱德思考试时，识别并纠正这些错误能大幅提高成绩。本指南突出了生物、化学和物理中十个普遍的误区，并给出清晰的纠正和适合考试的解释。
1. Force and Motion: Constant Force Does Not Mean Constant Speed | 力与运动：恒定力不等于恒定速度
A very common error is to think that if a constant force acts on an object, it will move at a constant speed. Students often believe that a steady push results in steady motion.
一个非常常见的错误是认为如果一个恒力作用在物体上，物体就会以恒定速度运动。学生通常认为稳定的推力会导致稳定的运动。
The correct concept is that a net constant force produces constant acceleration, not constant speed. According to Newton's second law, F = m × a. If the resultant force is constant, the object accelerates uniformly. Constant speed occurs only when the resultant force is zero (balanced forces). For example, a car moving at a constant velocity experiences zero net force because the driving force is cancelled by friction and air resistance.
正确的概念是，合外恒力产生恒加速度，而不是恒定速度。根据牛顿第二定律，F = m × a。如果合力恒定，物体将匀加速。只有当合力为零（平衡力）时，才会出现恒定速度。例如，匀速行驶的汽车所受净力为零，因为驱动力被摩擦力和空气阻力抵消。
Exam tip: always check if the forces are balanced or unbalanced. Write 'constant velocity → resultant force = 0' in your notes.
考试技巧：始终检查力是平衡还是不平衡。在笔记中写下"恒定速度 → 合力 = 0"。
2. Chemical Bonding: Ionic Compounds Do Not Form Molecules | 化学键：离子化合物不形成分子
Many learners describe sodium chloride (NaCl) as a 'molecule of salt'. This reflects a deep misunderstanding of ionic structure. Ionic compounds consist of a giant lattice of positive and negative ions held together by electrostatic forces, not discrete molecules.
许多学生将氯化钠（NaCl）描述为"盐分子"。这反映了对离子结构的深层误解。离子化合物由正负离子通过静电作用组成的巨型晶格构成，而不是分立的分子。
The formula NaCl represents the simplest ratio of ions in the lattice (the empirical formula), not a separate molecule. In the solid state, each Na⁺ ion is surrounded by six Cl⁻ ions and vice versa. There are no NaCl molecules. Therefore, we cannot talk about the 'molecular formula' of an ionic substance—only the empirical formula.
化学式NaCl表示晶格中离子的最简比（经验式），而不是一个单独的分子。在固态下，每个Na⁺离子被六个Cl⁻离子包围，反之亦然。不存在NaCl分子。因此，我们不能说离子物质的"分子式"——只有最简式。
A good way to remember: ionic compounds are held together by strong electrostatic attraction in all directions. They have high melting points and conduct electricity when molten or dissolved, because the ions are free to move—another feature that a simple molecule cannot have.
一个好记的方法是：离子化合物由各方向的强静电引力结合在一起。它们具有高熔点，在熔融或溶解时能导电，因为离子可以自由移动——这是简单分子不可能具有的特征。
3. Breathing vs. Respiration: Not the Same Process | 呼吸与呼吸作用：不是同一过程
Students often use the words 'breathing' and 'respiration' interchangeably. However, they are distinct processes. Breathing (vent
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