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Какой должна быть масса образца цинка, чтобы в нём содержалось столько же атомов, сколько их находится в образце железа массой 112 г?
Вычисления производи с точностью до целых.
Ответ: ... г.
Ответы 1
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Молярная масса железа - 56 г/моль
В 112 г железа - 2 моль атомов (112/56=2)
Молярная масса цинка - 65 г/моль
2 моль цинка имеет массу 65*2=130 г.
Ответ: 130 г.
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Автор:
andrea - 5 лет назад
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Exercise #11
Directions: The questions here test your knowledge of English grammar. Each question consists of a short written conversation, part of which has been omitted.
Four words or phrases, labelled 1, 2, 3, and 4, are given below the conversation. Choose the word or phrase that will correctly complete the conversation. Click on the answer you think is correct .
1. _____ the floor manager, we don't need to work this Friday afternoon.
According
According of
According from
According to
2. You _____ see the doctor if that back ache persists.
better
better have
have better
had better
3. How long does it take _____ the nearest train station?
get to
to get
to get to
getting to
4. He likes his new job very much and _____.
works hardly
hard works
hardly work
works hard
5. Please fill _____ this online application form.
up
on
down
out
6. "I've never seen that movie."
"_____ have I."
So
Either
Neither
Too
7. "Haven't you been to New York?"
"_____ been there."
Yes, I haven't
Yes, I wasn't
No, I haven't
No, I have
8. "Where does Helen live?" "She lives _____."
in the Moore Street
on Moore Street
at Moore Street
on the Moore Street
9. Is your TV _____?
as large as mine
so large as me
as large as me
so large as mine
10. I've never seen _____.
such a tall man
so tall man
such tall man
as tall man
11. Please carry this box _____ the next room.
inside
at
in
into
12. My mother didn't buy _____ food at that store.
one
some
a
any
13. "How often do you play tennis?"
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two times in a month
two times a month
two months a time
two times of a month
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at
on
in
to
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will have
have
would have
had
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been a concert like this before
been a concert like before this
a concert been like this before
before a concert been like this
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at
in
inside
into
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the cell phone of my friend
my friend's
belong a friend of mine
one of my friends
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on your right firmly hand
in your firmly right hand
firmly in your right hand
firmly on your right hand
20. It's really hard to believe _____.
he would say such a terrible thing
such a terrible thing he would say
to say he would such a terrible thing
would he say such a terrible thing
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I think so
So I think
I so think
So think I
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before
to the front of
in front of
front of
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Every one
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Every all of
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spoke that
talked that
said that
told that
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