问题 填空题

如图所示是甲、乙两种物质的溶解度曲线.请回答下列问题:

(1)P点的含义是______.

(2)t2℃时,把2.4g乙固体放入10mL水中(水的密度约为1g/cm3),充分搅拌,所得溶液的质量是______g.

(3)t2℃时,在90g 10%的乙溶液中加入15g乙固体,充分搅拌,所得溶液的溶质质量分数为______.

答案

(1)曲线中交点表示该温度时两种物质的溶解度相等,所以P点的含义是t1℃时甲和乙的溶解度相等;

(2)t2℃时乙的溶解度是25g,即100g水中最多溶解25g乙物质,10mL水的质量:10mL×1g/cm3=10g,所以10g水中最多溶解2.5g乙物质,所以t2℃时,把2.4g乙固体放入10mL水中(水的密度约为1g/cm3),充分搅拌,所得溶液的质量是:2.4g+10g=12.4g;

(3)90g10%的乙溶液中含溶质:90g×10%=9g,含水81g,加入15g乙固体时,溶质变为:15g+9g=24g,而81g水中能溶解溶质质量:0.25g×81=20.25g,所以加入的15g固体乙没有全部溶解,所以溶液为饱和溶液,溶质质量分数:

25g
100g+25g
×100%=20%.

故答案为:(1)t1℃时甲和乙的溶解度相等;(2)12.4;(3)20%.

阅读理解

1. TODAY, Friday, November 12

JAZZ with the Mike Thomas Jazz Band at The Derby Arms.  Upper Richmond Road West, Sheen.

DISCO Satin Sounds Disco. Free at The Lord Napier, Mort lake High St., from 8 a.m. to 8 p.m. Tel: 652 - 1158.

2. SATURDAY, November 13

JAZZ Lysis at The Bulls Head, Barnes. Admission 60p.

MUSICAL HALL at The Star and Garter, Lower Richmond Road, Putney, provided by the Aba Daba Music Hall company. Good food and entertainment fair price. Tel: 789 – 6749 .

FAMILY night out? Join the sing-along at The Black Horse. Sheen Road, Richmond.

JAZZ The John Bennett Big Band at The Bull’s Head, Barnes. Admission 80p.

THE DERBY ARMS, Upper Richmond Road West, give you Joe on the electric accordion(手风琴). Tel: 789—4536

3. SUNDAY, November 14

DISCO Satin Sounds Disco, free at The Lord Napier, Mort Lake High Street, from 8 a. m. to 8 p. m.

FOLK MUSIC at The Derby Arms. The Short Stuff and residents the Norman Chop Trio. Non-remembers 70p. Tel: 688-4626.

HEAVY MUSIC with Tony Simon at The Bull, Upper Richmond Road West, East Sheen.

THE DERBY ARMS, Upper Richmond Road West, give you Joe on the electric accordion.

小题1:

Where and when can you hear the Norman Chop Trio?

A.At the Bull’s Head on Sunday.

B.At the Derby Arms on Sunday.

C.At the Bull on Saturday.  

D.At the Black Horse on Saturday.小题2:

Where and when can you hear the Mike Thomas Jazz Band?

A.At the Derby Arms on Friday.  

B.At the Black Horse on Friday.

C.At the Star and Garter on Saturday.

D.At the Derby Arms on Sunday.小题3:

You want to enjoy the electric accordion on Saturday. Which telephone number do you have to ring to find out what time it starts?

A.789—6749.

B.789—4536.

C.682—1158.

D.688—4626.小题4:

You want to spend the Saturday by joining the entertainment with your family. Where should you go?

A.Disco at The Lord Napier.

B.The sing-along at The Black Horse.

C.The electric accordion at The Derby Arms.

D.Jazz at The Bull's Head.小题5:

You want to spend the  same day at two different places and don't want to cross any street.Which or the following is your best choice?

A.The sing-along at the Black Horse and Jazz at The Bull's Head.

B.The sing-along at The Black Horse and Folk Music at The Derby Arms.

C.Folk Music at The Derby Arms and Heavy Music with Tony Simon at The Bull.

D.Musical Hall at The Star & Garter and Disco at The Lord Napier.

单项选择题