精英家教网 > 初中地理 > 题目详情

【题目】一杯20的NaNO3溶液,能证明它是饱和溶液的是(

A.蒸发10g水有NaNO3晶体析出

B.降低10时,有NaNO3晶体析出

C.加入10gNANO3晶体,仍有NaNO3晶体未溶解

D.在该温度下,加入少许NANO3晶体,晶体质量不减少

【答案】D

【解析】判断溶液是否饱和的依据是:看在一定温度下,溶剂不变时,能不能再继续溶解该物质.

练习册系列答案
相关习题

科目:初中地理 来源: 题型:

【题目】下列日常洗涤操作中,是利用乳化的原理达到清洗目的的是 ( )

A.用自来水清洗蔬菜

B.用汽油清洗油污

C.用洗涤剂清洗餐具

D.用酒精清洗碘渍

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】摇摇冰是一种即用即冷的饮料。吸食时将饮料罐隔离层中的化学物质和水混

合后摇动即会制冷.该化学物质是

A.氯化钠 B.固体硝酸铵 C.固体氢氧化钠 D.生石灰

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】四、情景交际(有两项多余)

A: Where did you go on vacation, Peter?

B: 1

A: Oh, Qingdao is a beautiful city. 2

B:Yes, I did. I went with my brother.

A: 3

B:We visited Zhongshan Park, swam in the sea and tasted some

seafood on the beach.

A: Sounds great!4

B: We stayed there for three days. 5 Where did you go, Julia?

A:Well, I just stayed at home and helped my parents clean the house.

A. What about you?

B. How long did you stay there?

C.I went to Qingdao during the vacation.

D. What did you do in Qingdao?

E.Is it your first time to Qingdao?

F. Did you go with anyone?

G. How are you?

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】不能影响固体物质溶解度大小的因素是

A.温度高低 B.溶质、溶剂的量

C.溶剂种类 D.溶质种类

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】佛山市三水健力宝厂生产的“魔水”驰名中外.“魔水”内溶有一定量的二氧化碳气体.打开瓶塞,“魔水”会自动喷出;喝了“魔水”后常会打嗝,说明气体在水中的溶解度与压强、温度有关.以下关于气体溶解度的说法正确的是

A.压强增大,气体溶解度不变

B.压强减小,气体溶解度增大

C.温度升高,气体溶解度减小

D.温度降低,气体溶解度减小

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】I have _________ uncle. He likes _________very much. He ______ soccer, baseball,volleyball, basketball, and so on. He plays baseball and basketball very_____. He likes to ____ the sports games ______TV. He plays sports_____.He often says, “Let’s_____…”He_____two clubs: a basketball club and a baseball club. He __ a sports collection. He has 12 tennis rackets, 10 baseballs, 3 volleyballs, 2 basketballs and one soccer ball.

1A. a B. an C. the D. is

2A. vegetables B. books C. music D. sports

3A. loves B. have C. joins D. play

4A. much B. more C. well D. good

5A. play B. plays C. watch D. watches

6A. in B. on C. to D. of

7A. everyday B. some day C. every day D. someday

8A. plays B. play C. playing D. to play

9A. joins B. plays C. asks D. takes

10A. have B. has C. doesn't have D. don’t have

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】在某温度时有一杯某物质的饱和溶液,在温度不变的条件下蒸发一部分溶剂后,

有晶体析出,则该溶液

A、仍为饱和溶液

B、溶液中溶质的质量不变

C、该温度时,该溶质溶解度变小

D、变成不饱和溶液

查看答案和解析>>

科目:初中地理 来源: 题型:

【题目】发展教育和科学是先进文化建设的

A.重要保障

B.重要内容和中心环节

C.基础工程

D.物质基础

查看答案和解析>>

同步练习册答案