1.单选题- (共4题)
A.用溴水可鉴别苯与乙醇 |
B.分子式为C5H12的有机物只有三种,它们互为同系物 |
C.苯不能使溴的四氯化碳溶液褪色,说明苯分子中没有碳碳双键 |
D.不能用KMnO4溶液除去乙烷中的乙烯 |
A.冰熔化时,分子中H—O键发生断裂 |
B.HI比HF易分解,是因为HI分子间不存在氢键 |
C.CO2与SiO2都属于分子晶体 |
D.熔沸点由高到低的顺序是:金刚石>NaCl>Na |
A.石油分馏时温度计水银球位置处在蒸馏烧瓶的支管口附近 |
B.5mL 10%硫酸铜溶液中滴入5滴5%氢氧化钠溶液,再加入1mL葡萄糖溶液,加热,可观察到砖红色沉淀 |
C.在乙醇中加入钠可产生氢气 |
D.浓HNO3应保存在棕色试剂瓶中,并贮存在避光、低温处 |
2.选择题- (共3题)
My feelings about science have {#blank#}1{#/blank#}(complete) changed. More than one science teachers at my new school{#blank#}2{#/blank#} excellent and{#blank#}3{#/blank#}(friend). The science{#blank#}4{#/blank#}(facility) are very good with laboratories that have all the{#blank#}5{#/blank#}(late) equipment. Our chemistry teacher takes us to public science lectures about four times{#blank#}6{#/blank#} term,{#blank#}7{#/blank#}are always interesting, because the lecturers are famous at their area of science. In the last 20 years, seven Canadian scientists{#blank#}8{#/blank#}(win) the Nobel Prize. Now{#blank#}9{#/blank#}I'm becoming more and more interested in is physics and I want to study it at university. But my parents are{#blank#}10{#/blank#}(astonish), as they always thought I would become an English teacher.
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【1】题量占比
单选题:(4道)
选择题:(3道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:1
7星难题:0
8星难题:2
9星难题:1