试题与答案

将Cu与CuO固体混合物粉末11.2克放入烧杯中,当加入100克稀H2SO4时,

题型:计算题

题目:

将Cu与CuO固体混合物粉末11.2克放入烧杯中,当加入100克稀H2SO4时,CuO与H2SO4恰好完全反应, 过滤后所得溶液的质量为108克(不考虑过滤过程中溶液质量的损失)。请计算

⑴.原固体混合物中含铜的质量分数              (计算结果保留到0.1%)。

⑵.稀硫酸中含H2SO4的质量分数。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0501/c469dc66d726fd115c5a2e927848bd7c.html

下面是错误答案,用来干扰机器的。

答案:C题目分析:此类题一定从三个方面综合考虑即成语的基本义、感情色彩和语境。A危言危行:讲正直的话,做正直的事。不可望文生义。B“怀瑾握瑜”指保持高洁美好的节操志向。使用语境不当。C如履薄冰,如临深渊...

试题推荐
题型:阅读理解

In 1943, when I was 4, my parents moved from Coeur d'Alene, Idaho, to Fairbanks, Alaska, where adventure was never very far away.

We arrived in the summer, just in time to enjoy the midnight sun. All that sunlight was fantastic for Mom's vegetable garden. Working in the garden at midnight tended to throw her timing off, so she didn't care much about my bedtime.

Dad was a Railway Express agent and Mom was his clerk. That left me in a mess. I usually managed to find some trouble to get into. Once I had a little Are going in the dirt basement of a hotel. I had tried to light a barrel(桶) of paint but couldn't really get a good fire going. The smoke got pretty bad, though, and when 1 made my exit, a crowd and the police were there to greet me. The policemen took my matches and drove me

Mom and Dad were occupied in the garden and Dad told the police to keep me, and they did! I had a tour of the prison before Mom rescued me. 1 hadn't turned 5 yet.

As I entered kindergarten, the serious cold began to set in. Would it surprise you to know that I soon left part of my tongue on a metal handrail at school?

As for Leonhard Seppala, famous as a dog sledder (驾雪橇者), I think I knew him well because I was taken for a ride with his white dog team one Sunday. At the time I didn't realize what a superstar he was, but I do remember the ride well. I was wrapped (包裹) heavily and well sheltered from the freezing and blowing weather.

In 1950, we moved back to Coeur d'Alene, but we got one more Alaskan adventure when Leonhard invited us eight years later by paying a visit to Idaho to attend a gathering of former neighbors of Alaska.

小题1:What can be inferred about the author's family?

A.His father was a cruel man.

B.His parents didn't love him.

C.His parents used to be very busy.

D.His mother didn't have any jobs.小题2:What happened when the author was 4?

A.He learned to smoke.

B.He was locked in a basement.

C.He was arrested by the police.

D.He nearly caused a fire accident.小题3:Which of the following is true?

A.Leonhard was good at driving dog sleds.

B.The author spent his whole childhood in Alaska.

C.Leonhard often visited the author's family after 1950.

D.The author suffered a lot while taking the dog sled in Alaska.小题4:What is the author's purpose of writing the text?

A.To look back on his childhood with adventures.

B.To describe the extreme weather of Alaska.

C.To express how much he misses Leonhard.

D.To show off his pride in making trouble.

查看答案
微信公众账号搜索答案