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dolgikof
dolgikof
18.02.2023 01:14 •  Химия

Ex.1  Complete the sentences with relative pronouns from the box.   

THAT – WHEN – WHERE - WHICH - WHO – WHOSE - WHY 

1. The new movie is about a boy has lost his parents in a car accident. 2. He is the young man, wife left him for someone else. 3. The DVD recorder I bought at this store a few days ago is not working. 4. That's the book I recommended reading in class. 5. Is this the hotel you are staying for the tournament? 6. My dad, travels a lot on business, is in Australia at the moment. 7. It was midnight the first rescue team arrived at the scene of the accident. 8. There are several reasons I am not allowed to give you any information. 9. We stayed at the famous Rockstar hotel, also had an indoor swimming pool. 10. Did you write back to the person offered you a job? 11. The story is about a young woman 5-year old son suddenly disappears. 12. The tennis court they usually play is currently not available. 13. My sister was born at a time my dad was out of work. 14. Where is the money I gave you yesterday? 15. That's the man I spoke to the other day. 16. Mr. Fields, sister is one of the leading experts in this country, talked about the dangers of the virus. 17. He didn't tell us he made such an irresponsible decision. 18. The present I got from my boyfriend was really fantastic. 19. I have to buy a present for my mother, birthday is next week. 20. The youth hostel we stayed last week was really big

Exercise 2  Choose the correct relative pronoun. 

The dog barking you can hear is our neighbour's dog.

a) who   b) which   c) whose 

This is the purse I am looking for.

a) what   b) that   c) whose 

Could you tell me the name of the boy is sitting opposite us?

a) that   b) which   c) whom 

My mother, worked as a nurse, is retired now.

a) that   b)  who   c) which 

I don't know the phone number is used in case of emergencies.

a) what   b) which   c) who 

We booked a really comfortable hotel room, was a very good idea.

a) that   b) what   c) which 

Exercise 3  Use that, who, which or whose to complete the sentences. Write commas where necessary. 

Miss Anderson reputation is so  good comes to help us. 

 

What have you done with the pen I left on the table? 

 

I delivered the parcel to Charles gave it to Ann. 

 

His wife is an architect designed their new house.

Can you hear the noise comes from the cellar? 

 

Everybody saw the attack should contact the police. 

 

The town towers you can see is York. 

 

Is he the new teacher you told me about? 

 

His last film is the best film I've ever seen hasn't a big audience.

 Ex.4 Complete the sentences with relative pronouns:

1 The jacket on the coatstand is  mine.

2 The museum we visited on holiday is very interesting.

3 My father is very tall lives in the country.

4 The picture style comes from Roman empire is unique.​

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Ответ:
alexey2ristp00z7s
alexey2ristp00z7s
28.01.2021 19:52

a) H3(+1)P(+5)O4(-2)

H3PO4 - ортофосфорная кислота

С.о. фосфора=+5.

Ca(+2)(H2(+1)P(+5)O4(-2))2

Ca(H2PO4)2 - дигидроортофосфат кальция

С.о. фосфора=+5

P2(+5)O5(-2)

P2O5 - оксид фосфора(V)

С.о. фосфора=+5.


б) Cu2(+1)O(-2)

Cu2O - оксид меди(I)

С.о. меди=+1

Cu(+2)(N(+5)O3(-2))2

Cu(NO3)2 - нитрат меди(II)

С.о. меди=+2

(Cu(+2)O(-2)H(+1))2C(+4)O3(-2)

(CuOH)2CO3 - гидроксокарбонат меди(II)

С.о. меди=+2.


в) K2(+1)S(+4)О3(-2)

K2SO3 - сульфит калия

С.о. серы=+4

Mg(+2)(H(+1)S(-2))2

Mg(HS)2 - гидросульфид магния

С.о. серы=-2

K(+)Al(+3)(S(+6)O4(-2))2

KAI(SO4)2 - сульфат калия-алюминия

С.о. серы=+6.

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Ответ:
787363
787363
22.12.2021 19:26
химическая связь,возникающую в результате образования общих электронных пар наз. ковалентной связью.
Существует ковалентно неполярная связь, которая образуется между атомами у которых одинаковая электроотрицательность. например: Н2 ;  О2    N2    CL2    Br2    F2      I2
ковалентно полярная связь образуется между неметаллами у которых электроотрицательность отличается но незначительно. например:
h3n(NH3)    H2S CO2 CH4 HCL  H2O и др.
ионная связь образуется между неметаллом и металлом у которых электроотрицательность    сильно отличается . например:
cacl2  NaCl KBr и др.
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