问题 选择题

我国江西赣州蕴藏着丰富的钨矿资源,被称为“世界钨都”.冶炼金属钨(W)的重要反应是X+3H2W+3H2O.下列说法正确的是(  )

A.该反应属于化合反应

B.该反应中钨元素的化合价没有变化

C.X的化学式为WO3

D.该反应中氢元素的化合价均为+1价

答案

由反应的化学方程式X+3H2

 高温 
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W+3H2O,反应后W和3H2O中含有1个W原子、6个H原子和3个O原子,而反应前3H2中只含有6个H原子,则X分子由1个W原子和3个O原子构成,物质X的化学式为WO3

A、该反应的化学方程式WO3+3H2

 高温 
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W+3H2O,反应为一种单质与一种化合物生成一种单质与一种化合物的置换反应,而不属于化合反应,故选项A不正确;

B、根据化合物中各元素化合价代数和为0,可知反应前WO3中W元素化合价为+6价,而反应后单质W中W元素化合价为0价,反应前后W元素的化合价由+6价变为0价,故选项B不正确;

C、由反应的化学方程式X+3H2

 高温 
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W+3H2O,物质X的化学式为WO3;因此选项C是正确的;

D、反应前H2中H元素化合价为0价,反应后H2O中H元素的化合价为+1价,反应中氢元素的化合价由0价变为+1价,故选项D不正确;

故选C.

阅读理解

The father-chlild relationship(父子关系)is the most important because in many families the father is the head of the family and a role model to his children.

1. When a child is born in the family, the parents plan a future .The father is the most excited as he has different plans for new son or daughter.

2. In today ’s world ,fathers especially have no time for family .Work has taken up their time ,so they spend less time with their family and children. The importance of father and child bonding(亲密关系形成) has decreased in the recent years.

3. Do something together like playing games or a basketball match etc. Activities with your child help you get to know what she or he likes or dislikes and helps you bond better.

4.If your child tells you she or he loves her or his mother more . you should know that you haven’t spent enough time with the child .Ask your wife how to get closer to your child .

These are some tips for father and child boning in today ’s world .Children need both their parents to help them deal with the future when they grow up.

请根据以上信息,选择正确答案,将其标号在答题卡上涂黑。(每小题2分,共10分)

小题1:The father–children relationship is the most important becaues a father _______ .

A.has to meet his children every

B.is the head of a family and a model to his children

C.spends the most time with his children

D.often play with his children after work小题2:The underlined word “decreased ”means “____.”

A.消失

B.上涨

C.增加

D.降低小题3:If your child tells you she or he loves her or his mother more .      .

A.you should know that you haven’t spent enough time with the child .

B.you should know that you have spent enough time with the child .

C.you shouldn’t know that you haven’t spent enough time with the child .

D.you shouldn’t know that you have spent enough time with the child .小题4:The article was written mainly for _________ .

A.fathers

B.mothers

C.sons

D.daughters小题5:What’s the best title of this article?

A.How to plan a chlid’s future

B.How to make the child have a happier lifestyle

C.Father and child bonding is very important

D.Playing games with the child is nesessary.

单项选择题