【单选题】对于一定的物系,当温度升高时,溶解度系数H与相平衡常数m的变化为( )。
【简答题】(8分)已知A的分子式为C 3 H 4 O 2 ,下图是A~H间相互转化的关系图,其中F中含有一个七元环;H是一种高分子化合物。(提示;羟基与双键碳原子相连的醇不稳定;同一个碳原子上连有2个或多个羟基的多元醇不稳定)。请回答下列问题: (1)A中含有的官能团名称: ; (2)请写出下列有机物的结构简式: C ; H [ (3)请指出下列反应的反应类型:B D ;G 丙二酸 (4)请写出D和E生成F...
【单选题】岩浆岩的构造是指因岩石中不同矿物组分的分布与排列反映出来的外貌特征,下列示意图中,三种分布与排列方式依次对应的是? 1分布均匀排列定向、2分布均匀排列随机、3分布不均匀排列随机
【简答题】有机物A、B、C互为同分异构体,分子式为 C 5 H 8 O 2 ,有关的转化关系如下图所示, 已知:A的碳链无支链,且1 mol A能与4 mol Ag(NH 3 ) 2 OH完全反应;B为五元环酯。 提示:CH 3 -CH=CH-R (1)A中所含官能团是____。 (2)B、H结构简式为____、____。 (3)写出下列反应方程式(有机物用结构式表示) D→C________, E→F(只...
【单选题】听力原文:M: Let's look at your problem: you always fail the job interviews. W: It seems so, sir. And the thing is that I always find those questions hard to answer. For example, they always ask me what I ...
B.
Sense of accomplishment.
【单选题】It seems that he is always pretty _________ in most cases, for his judgment always goes with strong evidence.
【简答题】Getting away for a short time always seems like a great idea—until you have to pack. 小题1:The rule is: pack light. Here are some tips to help you pack. 1. Make a list. Think of what you need from your ...