Common Misconceptions in Pre-U AQA Chemistry and How to Correct Them | Pre-U AQA 化学常见误区与纠正方法

📚 Common Misconceptions in Pre-U AQA Chemistry and How to Correct Them | Pre-U AQA 化学常见误区与纠正方法

In Pre-U AQA Chemistry, students often develop misconceptions that can hinder their understanding and exam performance. This article identifies common pitfalls across topics such as equilibrium, kinetics, redox, and organic chemistry, and provides clear corrections to solidify your knowledge.

在Pre-U AQA化学学习中，学生常会产生一些误解，这些误解会影响他们的理解和考试成绩。本文指出了在平衡、动力学、氧化还原以及有机化学等主题中常见的误区，并提供清晰的纠正方法，以巩固你的知识。

1. Equilibrium Constants and Temperature Dependence | 平衡常数与温度依赖性

Many learners assume that if you add more reactant, the equilibrium constant Kc will increase to reflect a greater yield of products.

许多学习者认为，如果加入更多的反应物，平衡常数Kc会增大，以反映产物产率的提高。

However, Kc is constant at a given temperature. Adding reactant disturbs the equilibrium, and the position shifts to counteract the change, but Kc remains unchanged. For example, in the Haber process N₂(g) + 3H₂(g) ⇌ 2NH₃(g), increasing [N₂] shifts equilibrium to the right, yet Kc stays the same. Only a change in temperature alters Kc because it affects the relative rates of forward and reverse reactions depending on whether the reaction is exothermic or endothermic.

然而，在给定温度下Kc是常数。增加反应物会扰乱平衡，平衡位置会向抵消这一变化的方向移动，但Kc保持不变。例如在哈伯法N₂(g) +

Published by TutorHao | Pre-U Chemistry Revision Series | aleveler.com

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