5.3 2)open 3)closes 4)teaches 5)meet 6)washes 7)costs 8)costs 9)boils 10)I like her and she likes me 5.4 2)I often play basketball 3)Margaret usually works hard 4)Jenny always wears nice clothes 5)We always have dinner at 7-30 6)Tim never watches TV 7)Children usually like chocolate 8)Julia always enjoys parties 6.1 2)doesn`t play 3)don`t know 4)don`t work 5)doesn`t have 6)don`t do 6.2 1)Carol doesn`t like classical music,I like it. 2)Bill & Rose don`t like boxing,but Carol does.I like boxing. 3)Bill & Rose like horror films,Carol does`n like them.I like horror films. 6.3 2) I don`t go to the theatre very often 3)i OFTEN RIDE A BYCYCLE 4)I never eat in restaurants 5)I don`t travel by train very often 6.4 2)doesn`t use 3)don`t go 4)doesn`t wear 5)I don`t know 6)doesn`t cost 7)don`t see 7.1 2) Do you play tennis 3)does Ann play tennis 4)Where do your friends live? 5)does your brother speak English 6)do you do ex 7)does Paul often go away 8)do you want to be famous 9)does Linda work hard 7.2 3)HOw often do you watch TV 4) what do you want for dinner 5)do you like football 6)does your brother like football 7)what do you do in the evening 8)where does your sister work 9)do you often go to the cinema 10)what does this word mean 11)does it often snow here 12)what time do you usually go to bed 13)how much doesd it cost to phone New York 14)what do you usually have for breakfast 7.3 2)how is it 3)does it start 4)do you work 5)how do you go to work 6)does he do 7)does he teach 8)does he like his job
рОН = -lg[OH-] = -lg0,01 = 2.
Находим рН: рН + рОН = 14 <=> рН = 14 - рОН = 14 - 2 = 12.
2. Найдем степень диссоциации уксусной кислоты:
Ка = а²с/(1-а) <=> 1,78 * 10^(-5) = 0,1а²/(1-а) <=> 1,78 * 10^(-4) = а²/(1-а).
Решая квадратное уравнение, получаем а = 0,013.
Тогда рН = -lg[H+] = -lg(ac) = -lg(0,013 * 0,1) = 2,89.
3. Найдем степень диссоциации NH3*H2O:
Ka = a²c/(1-a) <=> 1,76 * 10^(-5) = 10^(-3) * a²/(1-a) <=> 0,0176 = a²/(1-a).
Решая квадратное уравнение получаем а = 0,1245.
Тогда рOН = -lg[OH-] = -lg(ac) = -lg(0,1245 * 0,001) = 10,1.
2)open
3)closes
4)teaches
5)meet
6)washes
7)costs
8)costs
9)boils
10)I like her and she likes me
5.4
2)I often play basketball
3)Margaret usually works hard
4)Jenny always wears nice clothes
5)We always have dinner at 7-30
6)Tim never watches TV
7)Children usually like chocolate
8)Julia always enjoys parties
6.1
2)doesn`t play
3)don`t know
4)don`t work
5)doesn`t have
6)don`t do
6.2
1)Carol doesn`t like classical music,I like it.
2)Bill & Rose don`t like boxing,but Carol does.I like boxing.
3)Bill & Rose like horror films,Carol does`n like them.I like horror films.
6.3
2) I don`t go to the theatre very often
3)i OFTEN RIDE A BYCYCLE
4)I never eat in restaurants
5)I don`t travel by train very often
6.4
2)doesn`t use
3)don`t go
4)doesn`t wear
5)I don`t know
6)doesn`t cost
7)don`t see
7.1
2) Do you play tennis
3)does Ann play tennis
4)Where do your friends live?
5)does your brother speak English
6)do you do ex
7)does Paul often go away
8)do you want to be famous
9)does Linda work hard
7.2
3)HOw often do you watch TV
4) what do you want for dinner
5)do you like football
6)does your brother like football
7)what do you do in the evening
8)where does your sister work
9)do you often go to the cinema
10)what does this word mean
11)does it often snow here
12)what time do you usually go to bed
13)how much doesd it cost to phone New York
14)what do you usually have for breakfast
7.3
2)how is it
3)does it start
4)do you work
5)how do you go to work
6)does he do
7)does he teach
8)does he like his job