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.
Теорія електролітичне дисоціації (Тед)
Електролітами називають речовини, водні розчини або розплави яких проводять електричний струм
Атоми і групи атомів, що несуть електричний заряд, називають іонами. Позитивно заряджені іони називають катіонами, негативно заряджені іони - аніонами
Процес розпаду речовини на іони при розчиненні у воді або розплавлення називають електролітичної дисоціацією
Електролітична дисоціація складається з двох одночасно протікаючих зворотних процесів: з дисоціації (розпад молекул на іони) і асоціації (процес утворення молекул з іонів). Тому в рівнянні електролітичноїдисоціації завжди ставлять знак зворотного протікання⇔
У водних розчинах дисоціації схильні кислоти, сильні підстави і розчинні солі
Приклад:
Дано:
m(р-ра MgSO₄) = 200 гр
ω(MgSO₄) = 20%
Найти:
m(MgSO₄ ⋅ 7H₂O) - ?
1) Для начала мы запишем уравнение реакций, теперь мы составляем пропорцию, при пропорций мы найдем массу сульфата магния:
x - ? 40 гр
MgSO₄ ⋅ 7H₂O (t°) → MgSO₄ + 7H₂O
1 моль 1 моль
246 гр/моль 120 гр/моль
2) Для начала мы найдем массу сульфата магния:
m(MgSO₄) = m(р-ра MgSO₄)×ω(MgSO₄)/100% = 200 гр × 20%/100% = 200 гр × 0,2 = 40 гр
3) Для начала мы найдем молекулярную сульфата магния, а потом кристаллогидрата:
M(MgSO₄) = 24+32+16×4 = 24+32+64 = 120 гр/моль
M(MgSO₄ ⋅ 7H₂O) = (24+32+16×4)+7×(1×2+16) = (56+64)+7×(2+16) = 120+7×18 = 120+126 = 246 гр/моль
4) Мы составили пропорцию под пунктом 1), перерь при пропорций мы найдем массу кристаллогидрата:
x = 40 гр × 246 гр/моль / 120 гр/моль = 40 гр × 2,05 = 82 гр ⇒ m(MgSO₄ ⋅ 7H₂O) = 82 гр
ответ: m(MgSO₄ ⋅ 7H₂O) = 82 гр