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【简答题】
实验室里有一种失去标签的银白色金属,欲通过实验探究确定它是哪种金属。 【查阅资料】 (1)查阅实验室药品储存记录。实验室中存放的金属试剂有铁、镁、铝、锌、锡、铅、铜、 银、铂和金。 (2)常见金属的活动性顺序(由强逐渐减弱)如下: 【猜想与假设】分析收集到的资料,对该金属有如下猜想:猜想一:该金属可能是铁、镁、铝、锌、锡、铅、银、铂、铜和金中的任意一种;猜想二:该金属可能是铁、镁、铝、锌、锡、铅、铂。经讨论后,小组同学认为猜想一不成立,理由是 _____________ 。 【设计方案】小组同学设计实验方案如图,实验一的目的是______________ 【实验与事实】按如图方案进行实验时, (1)在实验一中观察到:有大量气泡产生。 (2)在实验二中观察到:A、B试管中无任何现象;c试管中溶液的绿色逐渐变浅,金属 表面附有一层灰黑色固体。 【结论与解释】 (1)实验一中产生的现象说明该金属能与盐酸发生置换反应,即在金属活动性顺序中排在氢前。 (2)综合分析实验一和实验二中产生的现象,可推知该金属是___________。 (3)写出试管C中发生反应的化学方程式:__________。 【反思与评价】实验中将金属固体与稀盐酸在试管中混合反应时,将__________装入试管。 【拓展与应用】用该金属制作的容器不能盛装稀盐酸,用化学方程式解释其原因为 __________。
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【单选题】患者上腹胀,呕吐2天,清晨空腹就诊,查体发现上腹部振水音。最可能是
A.
正常
B.
胃内大量液体潴留
C.
腹腔内有大量液体
D.
腹腔内有游离气体
E.
腹腔内有肿块
【单选题】"One could not hide skeletons in the closet , because there were no closets." What's the meaning of "hiding skeletons in the closet"?
A.
making his or her closet a terrible place
B.
hiding something important in one's closet
C.
murdering a person and hiding the body in the closet
D.
keeping secret a bad or embarrassing fact about oneself
【简答题】I was small for my age. I was shy and sometimes it was hard for me to make friends with the others. However, learning came fairly easy for me. I was the best in most of my classes, but PE class was my...
【简答题】I was used to be the shyest person in the world. I often hide behind my mother whenever there came a visitor. When asking to speak in class, I could hard breathe. Then in the seven grade, I had a new ...
【单选题】课文句子:One could not hide skeletons in the closet ... 问题:What does "skeletons" mean in this sentence?
A.
bones
B.
secrets
C.
monster
D.
fire
【简答题】Do you want a friend whom you could tell everything 1 . __ _________ ___, like your deepest feelings and thoughts? Or are you afraid that your friend would laugh at you, or would not understand 2 ____...
【单选题】通过 INTERNET 消费者与消费者之间进行相互的个人交易称为
A.
B2B
B.
B2C
C.
C2C
D.
B2G
【简答题】阅读理解。 I was small for my age. I was shy and sometimes it was hard for me to make friends with others. However, learning came fairly easy for me. I was the best in most of my classes, but PE class was ...
【单选题】通过 Internet 消费者与消费者之间进行相互的个人交易称为( )
A.
B2B
B.
B2C
C.
C2C
D.
B2G
【单选题】患者上腹胀,呕吐2天,清晨空腹就诊,查体发现上腹部振水音。最可能是
A.
正常
B.
胃内大量液体潴留
C.
腹腔内有大量液体
D.
腹腔内有游离气体
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