问题 填空题

请写出下列反应的化学方程式,并在括号中注明反应类型.

(1)铁丝在氧气中燃烧:______,______反应.

(2)铁粉与硫酸铜溶液反应:______,______反应.

(3)天然气燃烧供给能量:______.

答案

(1)铁与氧气在点燃条件下反应生成四氧化三铁.

该反应的化学方程式为:3Fe+2O2

 点燃 
.
 
Fe3O4

该反应由两种物质反应生成一种物质,符合化合反应的概念,因此属于化合反应.

(2)铁与硫酸铜反应生成硫酸亚铁和铜.

该反应的化学方程式为:Fe+CuSO4═FeSO4+Cu.

该反应由一种单质与一种化合物反应生成另一种单质和另一种化合物,符合置换反应的概念,因此属于置换反应.

(3)甲烷与氧气在点燃条件下反应生成水和二氧化碳.

该反应的化学方程式为:CH4+2O2

 点燃 
.
 
2H2O+CO2

故答案为:

(1)3Fe+2O2

 点燃 
.
 
Fe3O4;化合.

(2)Fe+CuSO4═FeSO4+Cu;置换.

(3)CH4+2O2

 点燃 
.
 
2H2O+CO2

单项选择题
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Dear Daughter:

As we drove off from Columbia, I wanted to write a letter to you to tell you all that is on my mind.

First, I want to tell you how proud we are.Getting into Columbia is a real testament of what a great well-rounded student you are.You should be as proud of yourself as we are.

Your college years will be the most important years in your life.It is in college that you will discover what learning is about.This will be the period where you go from teacher-taught to master-inspired, after which you must become self-leamer.So do take each subject seriously, and even if what you learn isn't critical for your life, the learning skills you acquire will be something you cherish forever.

Follow your passion in college.Take courses you think you will enjoy.Don't be trapped by what others think or say, but make up your own mind.

Most importantly, make friends and be happy.College friends are often the best in life.Pick a few friends and become really close to them—pick the ones who are genuine and sincere to you.Don't worry about their hobbies, grades, looks, or even personalities.

Start planning early —what would you like to do? Where would you like to live? What would you like to leam? I think your plan of studying fashion is good, and you should decide where you want to be, and get onto the right courses.

Whether it is summer-planning, or coursework planning, or picking a major, or managing your time, you should take control of your life.I will always be there for you, but the time has come for you to be in the driver's seat - this is your life, and you need to be in control.Being in control feels great.Try it, and you'll love it!

College is the four years where you have:

●he greatest amount of free time

●the first chance to be independent

●the most flexibility to change

●the lowest risk for making mistakes

So please value your college years ?make full use of your free time, become an independent thinker in control of your destiny, be bold to experiment, leam and grow through your successes and challenges.

May Columbia become the happiest four years in your life, and may you blossom into just what you dream to be.

Love,

Dad (& Mom)

49.What does the author think college life holds in store for his daughter?

A.Opportunities and uncertainty.

B.Happy learning and pure enjoyment

C.Successes and challenges.

D.Independent learning and experimentation with life.

50.What does the underlined expression "be in the driver's seat" refer to?

A.Control what happens in a certain situation.      

B.Learn how to drive a car.

C.Stand in a driver's situation.                

D.Learn to adjust yourself to coursework

51.Which of these pieces of advice is given in the article?

a.think and live independently              b.learn how to learn

c.choose friends with similar personalities    d.be genuine and sincere

e.try new things

A.abc        B.bce        C.cde       D.able

52.From the text we can conclude the father     .

A.is worried about others' gossiping about his daughter

B.is strict with his daughter's making friends with others

C.is upset about his daughter's life planning

D.is optimistic about his daughter's future.