本文针对Cambridge Assessment International Education的International Advanced Level化学考试中的Paper1 Multiple Choice部分，选取了2019年5/6月考卷的部分易错题目进行详细讲解。题目涵盖orbital overlap和bond formation、不同物质性质辨识以及理想气体状态方程的应用。通过这些解析，帮助考生提升对关键知识点的理解，提高分数。
Paper 1全部都是选择题，虽然我们有25%蒙对的概率，不过总分只有40分，各个成绩等级之间相差了了，因此每一分都至关重要。
今天从19年的一套卷子中节选几道易错题来详细讲解，希望对大家的考试有所帮助。
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：
A σ bond is made between two carbon atoms in a molecule of ethene.
Which diagram shows the orbital overlap that occurs to form this bond?
题目难度：容易
考点分析：考查orbital overlapand bond formation
题目分析：carbon是sp2杂化，是sp2 orbital head to head overlap，所以只有C选项是两个sp2 orbital发生了head to head的overlap，所以答案选C。
题目2：
The table shows some properties of four substances.
Which substance could be potassium iodide?
题目难度：容易
考点分析：考查properties of different substances
题目分析：potassium iodide是ionic compound，melting point比较高，所以就把A和B选项给排除掉了；而ionic compounds在molten state下能够导电，所以把D选项给排除掉了，故而正确答案选C。
题目3：
X, Y and Z are all gases that behave ideally and react according to the equation shown.
When 3.0 mol of X and 3.0 mol of Y are placed inside a container with a volume of 1.0 dm3, they react to form the maximum amount of Z.
The final temperature of the reaction vessel is 120 °C.
What is the final pressure inside the reaction vessel?
题目难度：容易
考点分析：考查PV=nRT
题目分析：Y全部反应了，生成3.0 mol的Z，X还剩下1.5 mol，一共有4.5 mol，根据PV=nRT,可以求出答案为C。
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