【题目】“化学来源于生活”,圆梦中学的化学兴趣小组做了以下趣味实验:一定温度下,
有一杯食盐水,杯底尚有大量食盐固体不能溶解,现将新鲜的萝卜块放入其中,放置一段时
间。小组同学分别得出了以下说法,其中说法错误的是 ( )
A.原食盐水一定是饱和溶故 B.萝卜块质量一定减少
C.杯中的食盐固体一定全部溶解 D.溶液的质量一定增加
科目:初中地理 来源: 题型:
【题目】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(盯着)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. 亲戚
【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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科目:初中地理 来源: 题型:
【题目】Ⅲ. 根据要求完成下列句子。
【1】They played volleyball yesterday afternoon. (改为一般疑问句)
________they ________ volleyball yesterday afternoon?
【2】I went to Central Park with my sister on Sunday. (改为否定句)
I ________ ________ to Central Park with my sister on Sunday.
【3】Lucy bought a watchphone ten minutes ago. (对画线部分提问)
________ ________ Lucy ________ ten minutes ago?
【4】Jack is watching a football game on TV now.
(用last night替换now)
Jack ________ a football game on TV last night.
【5】My father went to Beijing yesterday. (对画线部分提问)
________ ________ your father ________ yesterday?
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科目:初中地理 来源: 题型:
【题目】t℃时,有一杯接近饱和的硝酸钾溶液,下列做法一定不能使其变为饱和溶液的是( )
A.恒温蒸发溶剂
B.降低溶液的温度
C.向溶液中加入硝酸钾
D.向溶液中加入t℃时硝酸钾的饱和溶液
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科目:初中地理 来源: 题型:
【题目】下列有关溶液的说法,不正确的是( )
A.蔗糖溶液是均一的、稳定的混合物
B.硝酸钾在20℃时溶解度是31.6g,则100g硝酸钾溶液中含有硝酸钾31.6g
C.在鱼池中设立水泵,把水喷向空中可以增加水中氧气的溶解量
D.冷却或蒸发溶剂都能使接近饱和的氯化钠溶液达到饱和
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科目:初中地理 来源: 题型:
【题目】下列关于溶解度的说法正确的是( )
A.100g水溶解20g某物质刚好饱和,则该物质的溶解度为20g
B.20℃时,100g水中溶解了10g某物质,在20℃时,该物质的溶解度为10g
C.20℃时,50g水最多可溶解18g食盐,则20℃时,食盐的溶解度为18g
D.20℃时,32g硝酸钾需要100g水才能恰好完全溶解,则20℃时硝酸钾的溶解度为32g
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科目:初中地理 来源: 题型:
【题目】周末做作业感到有点饿的小牛同学泡了一杯白
糖开水,他用筷子充分搅拌杯中的白糖后,将杯子放在一
边待糖水变凉,喝糖水时,发现杯底有少量未溶解的白糖
(如图)。下列操作或现象能说明糖水一定属于饱和溶液的
是( )
A.泡糖水时进行了充分搅拌
B.糖水热的时候白糖全部溶解
C.凉的糖水底部都有剩余的白糖
D.喝糖水时感到很甜
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