【題目】化工生產(chǎn)中為了加快反應(yīng)速率,常常先把反應(yīng)的固體配成溶液再兩兩混合。
(1)在農(nóng)業(yè)上,為了合理使用農(nóng)藥,常把不溶于水的固體或液體農(nóng)藥配成 _________ 或 _________ ,用來噴灑受病蟲害的農(nóng)作物。
(2)用X射線檢查腸胃病時,醫(yī)生會讓病人服用“鋇餐”來輔助檢查,“鋇餐”就是
硫酸鋇 (溶液、懸濁液、乳濁液)。
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【題目】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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【題目】下列防銹措施合理的是( )
A.經(jīng)常用水沖洗自行車鏈條
B.在鐵制暖氣片上刷“銀粉”
C.用“鋼絲球”打磨鋁鍋表面
D.用過的菜刀及時用鹽水清洗
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【題目】為了探究“乙醇是否能溶于水”,某化學(xué)興趣小組進行了如下實驗:
[操作步驟]
①在盛有2mL水的試管中滴入2~3滴紅墨水(振蕩),然后加入約2mL乙醇(不要振蕩),發(fā)現(xiàn)乙醇與滴有紅墨水的水分層.
②振蕩試管,觀察現(xiàn)象.
③……
[問題討論]
(1)在水中滴入紅墨水的目的是什么?
(2)在操作步驟①中,為了確保乙醇與水有明顯的分層現(xiàn)象,實驗操作時應(yīng)注意什么?
(3)要證明乙醇能溶于水,還應(yīng)進行操作步驟③.寫出實驗操作及現(xiàn)象.
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【題目】小英在做飯時,發(fā)現(xiàn)有很多因素都能影響食鹽在水中溶解的速率.
(1)從你能想到的可能影響食鹽在水中溶解速率的因素中,寫出其中兩項,并預(yù)測此因素對食鹽的溶解速率的影響.
因素①________,你的預(yù)測________________.
因素②________________,你的預(yù)測________________.
(2)從你所列因素中選出一個,并通過實驗驗證你的預(yù)測.________________________.
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【題目】Let’s __________ Chinese together.
A. study B. studying C. studies D. studys
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【題目】學(xué)習(xí)溶液的知識后,可以幫助我們正確認識溶液的組成及物質(zhì)的溶解過程,下表是幾位同學(xué)對溶液的錯誤認識,請你用熟悉的實例來否定其觀點.
序號 | 錯誤觀點 | 否定實例 |
(1) | 溶液一定是無色的 | |
(2) | 均一、穩(wěn)定的液體一定是溶液 | |
(3) | 溶液中的溶劑一定是水 | |
(4) | 一種溶劑最多溶解一種溶質(zhì) | |
(5) | 兩種液體混合后充分振蕩,一定得到溶液 |
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