【题目】化工生产中为了加快反应速率,常常先把反应的固体配成溶液再两两混合。
(1)在农业上,为了合理使用农药,常把不溶于水的固体或液体农药配成 _________ 或 _________ ,用来喷洒受病虫害的农作物。
(2)用X射线检查肠胃病时,医生会让病人服用“钡餐”来辅助检查,“钡餐”就是
硫酸钡 (溶液、悬浊液、乳浊液)。
科目:初中地理 来源: 题型:
【题目】C
It is Sunday afternoon. Mary goes to do the shopping with her mother. Her mother wants to buy some food for supper. Mary wants to buy a new skirt and some school things. They come to a shop.
"What does your shop sell?" Mary asks. "A lot of things." The girl in the shop says. "You can buy food, drinks, clothes in our shop and school things, too."
Mary and her mother go in. There are many people in the shop. Mary finds a nice white skirt.
"How much is the skirt?" Mary asks the girl in the shop.
"It’s eighty yuan."
"That’s too dear. Can I find a cheap one?"
"What about the green one? It looks nice. And it’s only thirty yuan."
"OK, thanks a lot."
"You are welcome."
After that, Mary buys some school things, too. Here mother buys a lot of food, like bread, cakes, meat and fish. They get home very late.
【1】Mary wants to buy a new skirt and _________.
A. some food B. some drinks
C. some clothes D. some school things
【2】Mary goes to do the shopping with her mother on ________.
A. Saturday afternoon B. Saturday morning
C. Sunday morning D. Sunday afternoon
【3】Mary buys a _________ skirt.
A. white B. green C. red D. dear
【4】The white skirt is __________.
A. ¥30 B. ¥110 C. ¥80 D. ¥100
【5】 The green skirt is ___________.
A. nice but dear B. nice and cheap
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科目:初中地理 来源: 题型:
【题目】为了探究“乙醇是否能溶于水”,某化学兴趣小组进行了如下实验:
[操作步骤]
①在盛有2mL水的试管中滴入2~3滴红墨水(振荡),然后加入约2mL乙醇(不要振荡),发现乙醇与滴有红墨水的水分层.
②振荡试管,观察现象.
③……
[问题讨论]
(1)在水中滴入红墨水的目的是什么?
(2)在操作步骤①中,为了确保乙醇与水有明显的分层现象,实验操作时应注意什么?
(3)要证明乙醇能溶于水,还应进行操作步骤③.写出实验操作及现象.
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科目:初中地理 来源: 题型:
【题目】小英在做饭时,发现有很多因素都能影响食盐在水中溶解的速率.
(1)从你能想到的可能影响食盐在水中溶解速率的因素中,写出其中两项,并预测此因素对食盐的溶解速率的影响.
因素①________,你的预测________________.
因素②________________,你的预测________________.
(2)从你所列因素中选出一个,并通过实验验证你的预测.________________________.
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科目:初中地理 来源: 题型:
【题目】Let’s __________ Chinese together.
A. study B. studying C. studies D. studys
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科目:初中地理 来源: 题型:
【题目】学习溶液的知识后,可以帮助我们正确认识溶液的组成及物质的溶解过程,下表是几位同学对溶液的错误认识,请你用熟悉的实例来否定其观点.
序号 | 错误观点 | 否定实例 |
(1) | 溶液一定是无色的 | |
(2) | 均一、稳定的液体一定是溶液 | |
(3) | 溶液中的溶剂一定是水 | |
(4) | 一种溶剂最多溶解一种溶质 | |
(5) | 两种液体混合后充分振荡,一定得到溶液 |
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