问题 填空题

有H、D、T三种原子它们之间的关系是______.各1mol的H2、D2、T2三种单质中质子数之比是______;在标准状况下,1L各种单质中它们的电子数之比是______,在标准状况下它们的单质的密度之比是______.

答案

①H、D、T三种原子质子数相同,中子数不同,互称同位素;

②每个H2、D2、T2分子中含有的质子数都是2,物质的量相同的三种单质含有的分子数相同,含有的质子数相同,所以为:1:1:1.

③每个H2、D2、T2分子中含有的电子数都是2,相同条件下,体积相同的三种单质中含有的电子数相等,所以比为:1:1:1;

④密度公式为:ρ=

m
V
=
nM
nVm
=
M
Vm
,相同条件下,Vm相同,所以其密度之比等于其摩尔质量之比,为1:2:3;

故答案为:互称同位素; 1:1:1; 1:1:1;1:2:3;

填空题
阅读理解

阅读理解

      The CEO of Apple, Steve Jobs' story about death

     When I was 17, I read a quote that went something like: "If you live each day as if it were your last,

someday you'll most certainly be right." It made an impression on me, and since then, for the past 33

years, I have looked in the mirror every morning and asked myself, "If today were the last day of my life,

would I want to do what I am about to do today?"

      Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make

the big choice in life.

     I was diagnosed with cancer.The doctors told me this was almost certainly a type of cancer that was

incurable, and that I would live no longer than three to six months.My doctor advised me to go home and

get my affairs in order, which is my doctors' code for preparing yourself to die.

     I lived with that diagnosis all day.I was completely in despair.Later that evening, I had another biopsy (活组织检查) and my wife told me that tumor turned to be curable with surgery.I had the surgery and

I'm fine now.

     This was the closest I've been to facing death.To tell the truth, no one wants to die.And yet death is

the destination we all share.No one has ever escaped it.It clears out the old to make room for the new.

Right now the new is you, but someday not too long from now, you will gradually become the old and be

cleared away.

     Your time is so limited that you shouldn't waste it repeating someone else's life.Don't be trapped by

dogma (教条)-which is living with the results of other people's thinking.Don't let the noise of others'

opinions drown out your own inner voice.And most importantly, have the courage to follow your heart.

It somehow already knows what you truly want to become.Everything else is secondary.

1. The doctor advised the author to go home and get his affairs in order because________.

A. he had to rest at home

B. his disease was not serious at all

C. his disease couldn't be cured

D. he had to wait for the result of the test

2. How did the author feel after the diagnosis?

A. Angry.      

B. Excited.

C. Optimistic.  

D. Hopeless.

3. What helps the author to make a big choice in life?

A. The cancer.

B. Knowing the coming death.

C. The doctors.

D. The desire for longer life.

4. What does the author think of death?

A. He thinks it is nothing to be scared of.

B. He thinks it is not the end of life.

C. He thinks it is impossible to avoid.

D. He thinks it is the beginning of a new life.

5. In Steve Jobs' opinion, we should ________.

A. follow others' advice

B. take no notice of diseases

C. take exercise and keep healthy

D. have the courage to follow our heart