IBDP化学课程真题讲解（4）

通常而言，IBDP 化学被视作一门比较难的学科。但对于一些小伙伴而言，IB化学却并不那么难。这两者并不矛盾。今天带着大家一起看一道IBDP化学课程的真题（HIGHER LEVEL PAPER 2）。这道题取自于IBDP chemistry specimen paper。不多说，直接上题。

题目1：One of the main constituents of acid deposition is sulfuric acid. This acid is formed from the sulfur dioxide pollutant.A mechanism proposed for its formation is:

(b) Consider the following equilibrium between the two oxides of sulfur, sulfur dioxide and sulfur trioxide:

题目难度：简单。

考点分析：考查position of equilibrium shift

题目分析：升高温度朝着吸热的方向移动，升高压强朝着分子数减少的方向移动，加催化剂不影响。

正确答案：

题目2：One of the main constituents of acid deposition is sulfuric acid. This acid is formed from the sulfur dioxide pollutant.A mechanism proposed for its formation is:

(a) State what the symbol (·) represents in the species shown in this mechanism. [1]

题目难度：简单。

考点分析：考查free radical

题目分析：点就代表radical，也就是未成对的电子。

正确答案：radical / unpaired electron

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