问题 推断题

铜和铁一样容易生锈,铜表面生成绿色铜锈,为了探究铜锈的组成,某兴趣小组从铜器上取下绿色粉未,按如下步骤进行实验。请回答下列问题:

(1)写出B物质的化学式     ,步骤⑤的化学方程式为                        

(2)步骤③得到两种气体,请简述其中一种气体的检验方法                      

(3)步骤④可以得到煤气(主要成分是H2和CO)的一种成分,写出步骤⑦的化学方程

                        ;通过以上实验可知,铜绿的组成元素是       

答案

(1)CuO, Fe+CuSO4=FeSO4+Cu(2)

根据物质的相互反应规律和特殊的现象找出突破点:E为蓝色溶液,E中一定含有有铜离子,B为黑色粉末,和稀硫酸反应生成E,可知B为氧化铜,E为硫酸铜,E和铁反应生成红色固体H,H为铜,C 在通电条件下可分解,则C为水,水通电生成的气体F和氧化铜加热生成铜,说明F具有还原性,则F为氢气.G和氧化铜加热生成铜,说明G具有还原性,具有还原性的气体主要是氢气和一氧化碳,G是由无色气体D和木炭高温反应生成的,G中含有碳元素,则G为一氧化碳,D为二氧化碳.进行解答

填空题
阅读理解

阅读理解。

     Here below are two pieces taken from a blog. 

     ▲ Growing up as one of three girls I've always been keen on women's issues. And now with three

daughters to raise, I have the responsibility of ensuring that they grow up without any preconceived (预

想的) ideas of their capabilities & potential based on their gender. Earlier this year I read an article that

indicated that women surpassed men in the workforce for the first time in history. That is a milestone!

And while we still don't have equality in leadership positions or pay (especially if you're a mom), we have

made significant progress over the past couple of decades. All this prompted me to do some digging around

to see what else I could learn. Here are some fun facts from the census bureau for you: 

     ● 29% of women aged 25 or older had obtained a bachelors degree in 2008 vs. 18% in 1987. 

     ● 55% of all college students were women in the Fall of 2008. 

     ● 60% of women 20 years or older participate in the workforce today vs. 34% in 1950. 

     ● 14% of the armed forces were women in 2008, compared to 2% in 1950. 

     ▲ We're all looking to stretch the value of our dollar as much as possible. Every day as you juggle the

needs of your family, remember to eat right, take your vitamins and keep up with laundry and bills-you

probably also look for budget friendly, family appropriate activities. A day trip to a national park is a great

way to explore all the wonders of nature: without breaking the bank. Once or twice a month, my wife and

I will prepare for a leisurely hike in one of our favorite parks close to home. The night before, she makes

some homemade granola and I make sure our reusable water bottles are full and on ice. Next time you're

looking for an inexpensive adventure that your family isn't soon to forget, take a hike! To find a national

park near you, just visit www. nps. gov.

1. According to the first blog, _____.[ ]

A. the blogger has three sisters 

B. there are more women than men at work this year

C. 14% of women are working in the army

D. women has got equality in leadership position

2. What is mainly talked about in the first blog? [ ]

A. Responsibility.

B. Women's potential.

C. Workforce.

D. Women s issues.

3. The underlined words "breaking the bank" in the second blog means _____. [ ]

A. robbing the bank

B. getting some money from the bank

C. using up the money in the bank

D. going to the bank

4. What's the writer's suggestion in the second blog? [ ]

A. We all have to think about the needs of our family.

B. All the wonders of nature are in the national park.

C. To go hiking once or twice a month will be an inexpensive adventure.

D. Each of us will have to make our budget friendly.