Concentration and Reaction Rate | 浓度与反应速率

📚 Concentration and Reaction Rate | 浓度与反应速率

In KS3 chemistry, understanding how concentration changes the speed of a reaction is a key skill. Concentration tells us how crowded particles are in a solution, and reaction rate tells us how quickly reactants turn into products. This article explains the collision theory, common experiments, graph skills and the real-world importance of concentration.

在KS3化学中，理解浓度如何改变化学反应的快慢是一项关键技能。浓度告诉我们溶液中粒子有多拥挤，而反应速率告诉我们反应物变成产物的速度。本文将解释碰撞理论、常见实验、图表技能以及浓度在现实世界中的重要性。

1. What is Concentration? | 什么是浓度？

Concentration describes how much solute is dissolved in a certain volume of solvent. A concentrated solution has more solute particles per cm³ than a dilute solution. For example, 2 mol/dm³ hydrochloric acid is twice as concentrated as 1 mol/dm³ hydrochloric acid.

浓度描述了一定体积溶剂中溶解了多少溶质。浓溶液每立方厘米含有比稀溶液更多的溶质粒子。例如，2 mol/dm³ 的盐酸浓度是 1 mol/dm³ 盐酸的两倍。

The common units are grams per cubic decimetre (g/dm³) or moles per cubic decimetre (mol/dm³). At KS3, you often compare volumes of acid or simply use the labels concentrated

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