问题 选择题

下列热化学方程式中,ΔH能正确表示物质的燃烧热的是

A.CO(g)+1/2O2(g)====CO2(g) ΔH=-283.0 kJ·mol-1

B.C(s)+1/2O2(g)====CO(g) ΔH=-110.5 kJ·mol-1

C.H2(g)+1/2O2(g)====H2O(g) ΔH=-241.8 kJ·mol-1

D.2C8H18(l)+25O2(g)====16CO2(g)+18 H2O(l) ΔH=-11 036 kJ·mol-1

答案

答案:A

25 ℃ 101 kPa条件下,1 mol纯物质完全燃烧生成稳定的氧化物时放出的热量,叫燃烧热,表示物质燃烧热的热化学方程式时,可燃物质必须是1 mol,B项、C项中的生成物不稳定,D项中,可燃物质的计量数不是1。故答案为A项。

阅读理解

"My dear dad, where are we going?" This has become the most popular question recently. It's a line from the theme song of Hunan TV station's reality show Where Are We Going, Dad?

"All of my classmates are big fans," said NingYun, 14, from Guangxi. "On Fridays, we remind each other: don't forget to watch it tonight! "

In the show, five pairs of fathers and kids go to strange places and finish interesting tasks. It's all about growing up. Fathers learn to cook and comfort their kids. The kids learn about teamwork and being independent (独立). Yet, growing up needs courage. In the show, 4-year-old Kimi finds it  hard to finish his work alone. "When I saw Kimi looking for his dad, I burst into tears," said Chen Yufang, 13, from Guangxi. "It reminded me of my first night at the school dormitory (宿舍). I really  felt the pain of growing up that night. "

When people see the fathers trying to help their kids, it also hits a soft spot in their hearts.

Tian Xiaofeng, 14, from Jiangsu, said his father is like Guo Tao in the program. "He is strict. And I was sad about it," he said. But now he sees it in a different way. "Guo Tao's son looks determined. I think his parenting style works. And I guess my father just wants me to be like that," he said.

On the journey of life, kids learn to grow up and adults learn to be better parents.

Maybe we can plan a trip with our parents.

Shall we go?

小题1:What is the most suitable word to replace the underlined word "determined" in the passage?

A.absent-minded

B.smart

C.out-going

D.strong-minded小题2:When could we see five fathers and their children on TV?

A.On Friday nights.

B.On Saturdays.

C.Every night.

D.Only on Sundays.小题3:What's the best title for the article?

A.Where are we going, Dad?

B.Fathers and their children.

C.A popular reality show.

D.Growing together.

单项选择题