相比IGCSE，A-level化学的难度属实是跳跃式升级。
如果对即将到来的夏季大考感到焦虑和压力，下面这些A-level化学不同paper的考试绝招就必须get起来了！
Paper1考试建议
一些问题可能会要求你结合一些知识点来选择正确的答案，所以答题前一定要准确的理解题目要求。
答题时，用铅笔划掉明显错误的选项，然后在其他选项中进行选择。
考试局：Cambridge Assessment International Education (CAIE)
考试类别：International Advanced Level
考试阶段：International Advanced Subsidiary
考试科目：Chemistry
考试单元：Paper 1 Multiple Choice
试卷代码：9701/12
试卷年份：May/June 2019
题目1：
Ethyl ethanoate undergoes the following reaction.
Equal amounts of ethanoic acid and ethanol were mixed together and allowed to reach equilibrium.
At equilibrium, the concentrations of both ethanoic acid and ethanol were 0.42 mol dm–3.
What is the concentration of ethyl ethanoate at equilibrium?
题目难度：一般
考点分析：考查equilibriumconstant的计算
题目分析：该题看起来比较简单，直接代入数据计算即可，但是要注意water的浓度和ethyl ethanoate的浓度是一样的，答案不是B而是C。
题目2：
Which row is an example of heterogeneous catalysis?
reaction; catalyst
A esterification; sulfuric acid
B the Contact process; divanadium pentoxide
C destruction of the ozone layer; chlorine radicals
D atmospheric formation of sulfur trioxide; nitrogen dioxide
题目难度：简单
考点分析：考查heterogeneous catalysis
题目分析：heterogeneous catalysis是指reactants和catalyst不在同一个state里，A是same state，B是不同的state（gas和solid），C是gas，D是gas，所以答案选B。