【简答题】((9分) (1)在配合物离子(FeSCN) 2 + 中,提供空轨道接受孤对电子的微粒是 。 (2)根据VSEPR模型,H 3 O + 的分子立体结构为 ,BCl 3 的构型为 。 (3)Cu 2 + 能与NH 3 、H 2 O、Cl - 等形成配位数为4的配合物。 ①[Cu(NH 3 ) 4 ] 2+ 中存在的化学键类型有 (填序号)。 A.配位键 B.离子键 C.极性共价键 D.非极性共价键 ...
【简答题】常温下,将某一元碱BOH和HCl溶液等体积混合,两种溶液的浓度和混合后所得溶液的pH如下表: 实验编号 HCl的物质的量浓度 (mol?L -1 ) BOH的物质的量浓度 (mol?L -1 ) 混合溶液的pH ① 0.1 0.1 pH=5 ② c 0.2 pH=7 ③ 0.1 0.2 pH>7 请回答: (1)从第①组情况分析,BOH是______(选填“强碱”或“弱碱”).该组所得混合溶液中由...
【单选题】一瓶氢气和一瓶氧气质量密度相同,分子平均平动动能相同,而且它们都处于平衡状态,两系统均视为理想气体系统,分子均视为刚性分子,则两系统:
【简答题】城乡二元结构体现了工业化进程中“ ”的基本特征,是“工农业发展水平还不够高的表现”。
【单选题】一瓶氢气和一瓶氧气质量密度相同,分子平均平动动能相同,且都处于平衡状态,则:
【单选题】一瓶氢气和一瓶氧气质量密度相同,分子平均平动动能相同,而且它们都处于平衡状态,两系统均视为理想气体系统,分子均视为刚性分子,则两系统:
【单选题】关于Ⅳ型超敏反应的特点叙述错误的是()
A.
炎症反应发生较慢,通常在接触抗原后24~72小时时出现炎症反应
D.
引起Ⅳ型超敏反应的抗原有胞内寄生虫、病毒、细菌等
E.
效应T细胞主要为CD4 + Th2和CD8 + Tc细胞
【单选题】What role does Amazon.com play in business world today?
【简答题】Section B Directions: There are 5 incomplete statements here. You should fill in each blank with the proper form of the word given in the brackets. 31. He is unable to answer the questions about the n...
【多选题】Which of the following are good study habits to develop?
A.
Interleave your learning by alternating your practice with different types of problems--don't waste study time by simply repeating the same technique over and over again.
B.
Keep practicing the easy material instead of focusing on the harder material because it's more comfortable to do this, and it will help you to enjoy your learning more.
C.
Have the TV on in the background for company and a readily available distraction while you are learning.
D.
Space out study sessions with smaller bits of information to be mastered in each session.