问题 填空题

依据表中的元素回答下列问题.

元素名称
元素符号HCOClCaFe
(1)若某可燃性气体由两种元素组成,一定含有的元素是______,可能含有的元素是______.

(2)若某还原性气体由两种元素组成,它能与一种红色固体反应生成黑色固体,写出该反应化学方程式______.

(3)A、B、C、D、E是由上述元素组成的常见物质,且均含有一种相同元素.其中A为单质,B、C、E为氧化物,且E常温下为气体.它们之间的关系如图所示.(图中“-”表示两端物质能发生化学反应,“→”表示物质转化关系)

写出C→A的化学方程式______;

写出A→B的化学方程式______;

写出B→D的化学方程式______.

答案

(1)若某可燃性气体由两种元素组成,则由元素的情况可知该气体是一氧化碳或甲烷等物质;

(2)若某还原性气体由两种元素组成,则该气体是一氧化碳,它能与一种红色固体反应生成黑色固体,该过程是一氧化碳和氧化铁的反应,方程式为:3CO+Fe2O3

高温
.
2Fe+3CO2

(3)由已知条件“A是单质,B、C、E是氧化物,A、B、C、D、E中含有一种共同的元素”可以推断共同的元素是氧元素,则A为O2;因为A是O2,B、C、E是氧化物,由图示C可转化为A,也可转化为B,可以推断,C为H2O2,B为H2O,C转化为AB的化学方程式为2H2O2

MnO2
.
2H2O+O2↑;由A→E可以推断E为CO2;因为B是水,由B→D可以推断,故D可为Ca(OH)2;则A→B的化学方程式为2H2+O2
点燃
.
2H2O,B→D是谁与氧化钙的反应化学方程式为:H2O+CaO═Ca(OH)2

故答案为:(1)C;H、O;

(2)3CO+Fe2O3

高温
.
2Fe+3CO2

(3)2H2O2

MnO2
.
2H2O+O2↑;2H2+O2
点燃
.
2H2O;H2O+CaO═Ca(OH)2

单项选择题
阅读理解

"My dream has come true.I have always wanted to be a Grand Slam (大满贯) champion."These are the words of the Chinese tennis player Li Na after she became the first Asian woman to win the Australian Open final on Jan.25th.2014.

"People were saying I'm getting old.So this is a great success for such an old woman." the 32-year-old girl joked.

Miss Li has a tattoo (文身).She has dyed her hair many different colors.And, at the 2008 Beijing Olympics, she told her fans to "shut up" when they got too noisy in their support.

Li Na was born in Wuhan.She started to play tennis at the age of 6.She once recalled: "As a child.I suffered a lot because every day I had to wake up early to practice.After school I had to practice more.I didn't have time to play."

Luckily, the strong girl didn't give up.thus making history for Chinese tennis time after time.Now the new champion is already thinking about winning another Grand Slam title."When you have one title, surely you will think about another," she says.not hiding her ambition.

"Chinese people are so lacking in confidence on the tennis court.If there is a person like me who can prove we Chinese can do it, the other young players in China will feel the same," she said.

小题1:Li Na began to learn playing tennis in the year of _____.

A.1988

B.1982

C.1986

D.1990小题2:We can learn from the passage that _____.

A.Li Na is always impatient with her fans

B.Li Na is an old girl

C.Li Na is a fashionable girl

D.Li Na is a girl without ambition小题3:When she began to play tennis, Li Na was _____.

A.happy

B.sad

C.excited

D.bored小题4:Which of the following is WRONG about Li Na?

A.Li Na took part in the 2008 Beijing Olympics.

B.Li Na has already won a Grand Slam champion.

C.Li Na had to wake up early to practice playing tennis.

D.Li Na said she lacked confidence on the tennis court.小题5:The passage mainly tells us _____.

A.something about the tennis

B.something about how to play tennis

C.the Chinese people and the tennis

D.the Grand Slam champion—Li Na