【題目】“化學(xué)來源于生活”,圓夢中學(xué)的化學(xué)興趣小組做了以下趣味實驗:一定溫度下,
有一杯食鹽水,杯底尚有大量食鹽固體不能溶解,現(xiàn)將新鮮的蘿卜塊放入其中,放置一段時
間。小組同學(xué)分別得出了以下說法,其中說法錯誤的是 ( )
A.原食鹽水一定是飽和溶故 B.蘿卜塊質(zhì)量一定減少
C.杯中的食鹽固體一定全部溶解 D.溶液的質(zhì)量一定增加
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【題目】A man once bought a parrot. The man let him fly freely all over the house instead of putting him in the cage. The parrot was pleased with that and flew from room to room,screaming with happiness.
"Who on earth are you?" said a voice from below. "Don't make that terrible noise any more."
The parrot saw a cat staring(盯著)up at him from the floor.
"I'm a parrot. 1've just arrived and I'm to make as much noise as I can,”he said.
"Well,I've lived here all my life, " answered the cat. "I was born in this house and I learnt from my mother that it is the best to keep quiet here."
"Keep quiet then," said the parrot happily. "I don't know what you do around here, but I know my job. My master bought me for my voice and I'm going to make sure he hears it."
【1】The underlined word "master" means " " in Chinese.
A. 爸爸 B. 主人 C. 哥哥 D. 親戚
【2】There are kinds of animals in the passage.
A. four B. three C. two D. one
【3】The cat asked the parrot to
A. listen carefully B. keep noisy
C. keep quiet D. do his job
【4】From the passage we know .
A. everyone should do his job
B. the cat sleeps every day
C. the parrot is not free
D. the cat has just arrived at the house
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【題目】Ⅲ. 根據(jù)要求完成下列句子。
【1】They played volleyball yesterday afternoon. (改為一般疑問句)
________they ________ volleyball yesterday afternoon?
【2】I went to Central Park with my sister on Sunday. (改為否定句)
I ________ ________ to Central Park with my sister on Sunday.
【3】Lucy bought a watchphone ten minutes ago. (對畫線部分提問)
________ ________ Lucy ________ ten minutes ago?
【4】Jack is watching a football game on TV now.
(用last night替換now)
Jack ________ a football game on TV last night.
【5】My father went to Beijing yesterday. (對畫線部分提問)
________ ________ your father ________ yesterday?
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【題目】t℃時,有一杯接近飽和的硝酸鉀溶液,下列做法一定不能使其變?yōu)轱柡腿芤旱氖牵?/span> )
A.恒溫蒸發(fā)溶劑
B.降低溶液的溫度
C.向溶液中加入硝酸鉀
D.向溶液中加入t℃時硝酸鉀的飽和溶液
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【題目】下列有關(guān)溶液的說法,不正確的是( )
A.蔗糖溶液是均一的、穩(wěn)定的混合物
B.硝酸鉀在20℃時溶解度是31.6g,則100g硝酸鉀溶液中含有硝酸鉀31.6g
C.在魚池中設(shè)立水泵,把水噴向空中可以增加水中氧氣的溶解量
D.冷卻或蒸發(fā)溶劑都能使接近飽和的氯化鈉溶液達到飽和
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【題目】下列關(guān)于溶解度的說法正確的是( )
A.100g水溶解20g某物質(zhì)剛好飽和,則該物質(zhì)的溶解度為20g
B.20℃時,100g水中溶解了10g某物質(zhì),在20℃時,該物質(zhì)的溶解度為10g
C.20℃時,50g水最多可溶解18g食鹽,則20℃時,食鹽的溶解度為18g
D.20℃時,32g硝酸鉀需要100g水才能恰好完全溶解,則20℃時硝酸鉀的溶解度為32g
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【題目】周末做作業(yè)感到有點餓的小牛同學(xué)泡了一杯白
糖開水,他用筷子充分?jǐn)嚢璞械陌滋呛螅瑢⒈臃旁谝?/span>
邊待糖水變涼,喝糖水時,發(fā)現(xiàn)杯底有少量未溶解的白糖
(如圖)。下列操作或現(xiàn)象能說明糖水一定屬于飽和溶液的
是( )
A.泡糖水時進行了充分?jǐn)嚢?/span>
B.糖水熱的時候白糖全部溶解
C.涼的糖水底部都有剩余的白糖
D.喝糖水時感到很甜
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