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【题目】甲、乙、丙三种固体物质的溶解度曲线如右图所示,请回答:

(1)图中M点表示:____时,甲和乙的溶解度相等。

(2)溶解度随温度的升高而减小的物质是______。

(3)若要从甲的饱和溶液中获得甲晶体,常采

用_____ _ 的方法。

(4)t2时,将等质量的上述三种物质分别加入到100g水中,充分搅拌,如果得到的溶液只有一种是饱和溶液,则该饱和溶液中的溶质是______。

【答案】

t1 冷却热饱和溶液

【解析】

根据分析图像可得,M点表示的是在t1 温度时,甲和乙的溶解度相等。溶解度随温度升高而减小的物质是丙物质。甲的溶解度随温度升高而增大,需要采用冷却热饱和溶液来提纯晶体。若向100g水中添加相同质量的物质,只有一种溶液是饱和状态,说明只有在相同温度(t2)条件下,溶解度小的可以是饱和状态,符合以上要求的只有丙物质。

知识点:溶解度曲线的运用。

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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】like,go,she,a,black,at,be,have,and,how

Mrs.Smith 1 Jim's mother.She loves her family very much.She2 to the store everyday.She often buys food,fnit3clothes for Jim and Mr.Smith. Now many clothes are on sale at Renmin Clothes Store.They are 4very good prices.Mrs.Smith comes to the store and 5wants to buy some clothes.for her family. They 6 sweaters in all colors for ¥l5 each and sports shoes foronly ¥28.Mrs. Smith 7

the red sweater and she buys one for herself.She buys8pair of sports shoes forher son.She buys the socks for her family.9much are they? They are 2O yuan.They are 10and white.

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科目:初中地理 来源: 题型:

【题目】人说话的声音是声带 产生的,闻其声而知其人是根据声音的 来判断的。

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科目:初中地理 来源: 题型:

【题目】小明先是在地面上走动,后又静止在地面上,则他对地面的压力和压强( )

A.减小,压不变 B.压力、压强都增大

C.压力、压强都不变 D.压力不变,压强增大

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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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科目:初中地理 来源: 题型:

【题目】36%的浓盐酸配制5%的稀盐酸的过程中,需要用到的仪器是(

量筒 天平 烧杯 胶头滴管 酒精灯 漏斗 玻璃棒

A.①③⑦

B.①③④⑦

C.②③⑤⑦

D.③④⑥

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