1.选择题- (共21题)
选项 | 物质 | 杂质 | 除杂试剂或操作方法 |
A | 氯化镁溶液 | 氯化钠 | 加入适量硝酸银溶液,再过滤 |
B | 硝酸钠溶液 | 硫酸钠 | 加入适量氯化钡溶液,再过滤 |
C | 熟石灰 | 石灰石 | 高温煅烧 |
D | 一氧化碳 | 二氧化碳 | 通过氢氧化钠溶液,再用浓硫酸干燥 |
①若要验证小莹同学的猜想:可向反应后的溶液中加入金属{#blank#}1{#/blank#},结果发现在该金属表面只生成红色固体,则证明该同学的猜想是错误的.
②因为稀盐酸是新配制的,不存在变质的可能,所以小斌同学的猜想也是错误的.
③小歆为了验证自己的猜想是正确的,在不改变药品和实验方法前提下,向实验结束后的试管中加入某种物质适量,结果发现溶液呈现蓝色.小歆加入的是下列哪种物质{#blank#}2{#/blank#}
A.酒精 B.水 C.硫酸铜溶液 D.氯化铜溶液
爱动脑筋的小歆对这一实验做了一点改进,将一根铜丝擦光亮后,一端绕成螺旋状放在酒精灯火焰上灼烧至表面出现黑色,然后趁热放进稀盐酸中,一会儿就可以看到螺旋上的{#blank#}3{#/blank#},溶液也由无色变成蓝色.化学方程式{#blank#}4{#/blank#}
①若要验证小莹同学的猜想:可向反应后的溶液中加入金属{#blank#}1{#/blank#},结果发现在该金属表面只生成红色固体,则证明该同学的猜想是错误的.
②因为稀盐酸是新配制的,不存在变质的可能,所以小斌同学的猜想也是错误的.
③小歆为了验证自己的猜想是正确的,在不改变药品和实验方法前提下,向实验结束后的试管中加入某种物质适量,结果发现溶液呈现蓝色.小歆加入的是下列哪种物质{#blank#}2{#/blank#}
A.酒精 B.水 C.硫酸铜溶液 D.氯化铜溶液
爱动脑筋的小歆对这一实验做了一点改进,将一根铜丝擦光亮后,一端绕成螺旋状放在酒精灯火焰上灼烧至表面出现黑色,然后趁热放进稀盐酸中,一会儿就可以看到螺旋上的{#blank#}3{#/blank#},溶液也由无色变成蓝色.化学方程式{#blank#}4{#/blank#}
某试剂瓶内装的估计是盐酸,要鉴别是否真是盐酸,应采用的实验操作是:首先用试管取少量待测液,加入{#blank#}1{#/blank#},然后,再用试管取少量待测液,加入{#blank#}2{#/blank#},如果是盐酸,前后两步的实验现象是{#blank#}3{#/blank#}、{#blank#}4{#/blank#}.
某试剂瓶内装的估计是盐酸,要鉴别是否真是盐酸,应采用的实验操作是:首先用试管取少量待测液,加入{#blank#}1{#/blank#},然后,再用试管取少量待测液,加入{#blank#}2{#/blank#},如果是盐酸,前后两步的实验现象是{#blank#}3{#/blank#}、{#blank#}4{#/blank#}.
2.单项选择- (共18题)
A.attract | B.pay | C.absorb | D.concentrate |
— Yes.We all ______ him of his rudeness.
A.That;accused B. What;accused
B.That;charged D. /;charged
A.Were | B.Should | C.If | D.Had |
A.relies on; processes |
B.depends on; processes |
C.depends on; is processed |
D.decides on; is processed |
A.is consisted | B.concludes | C.consists | D.contains |
A.admit | B.agree | C.prove | D.approve |
A.to take the place of | B.take place of |
C.to in place of | D.in the place of |
A.it is necessary to have planted more trees |
B.many more trees need to plant |
C.our city needs more trees |
D.we must plant more trees |
A.live | B.living | C.have lived | D.being lived |
A.open, stolen | B.opening ,stealing |
C.opened ,missed | D.opening, missing |
A.Having absorbed | B.Absorbed |
C.Absorbing | D.To be absorbed |
—_____a beautiful necklace.
A.As she received | B.Receiving |
C.Received | D.Because of receiving |
A.in the place of | B.in places |
C.in the place | D.in place |
A.of | B.for | C.about | D.with |
A. you are convenient | B.you will be convenient |
C. it will be convenient for you | D.it is convenient to you |
---- There ____.
A.comes the bus, is he |
B.the bus comes, he is |
C.comes the bus, he is |
D.the bus comes, is he |
—No, but I _____. I worked for the City Sports Meeting last year.
A.used to | B.used to be | C.used to do | D.was used to |
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【1】题量占比
选择题:(21道)
单项选择:(18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:18
7星难题:0
8星难题:0
9星难题:0