A DAY IN THE LIFE OF... Jenny Mackenzie, age 15
My nam
Leela Jaf
and I'm
seventee
from M
are five
She finds homes for hundreds of animals in her free after sick animals.
time!
Well,
to school, at about 8:30.
family
Bainga
welco
"I'm busy, but it's OK," Jenny says. “I love helping
Wednesdays and Fridays, Jenny tired in the morning!
goes to an animal shelter. She
speaks to families and animals."
chooses animals for them.
I Lei
Fifteen-year-old Jenny isn't a typical teenager. She also cleans cages, walks the dogs and looks ndia. T
Jenny leaves the shelter at about 7 o'clock. two bro
Jenny has a very busy routine. She always gets Sometimes, she takes a kitten home. She plays with and Ra
Flash, for a walk, then she has breakfast and goes homework. After that, at about 9:30, she watches a
up early, at about 7 o'clock. She takes her puppy, it and feeds it, then she eats dinner and does her brothe
DVD or chats to a friend on the phone. She goes to playing
After school, at about 3:30, on Mondays, bed late, at about 11:30. She usually feels really
Read the text and answer to the questions
1. What does Jenny do in her free time?
2.Does Jenny get up at eight o'clock?
3. When does Jenny do to the animal shelter?
4. What does she do there?
5. What time does Jenny go home?
6. What does she do after dinner?
7. Does she go to bed early?
8. How does she feel in the mofning?
1) Соответствующие уравнение реакции:
1. Au + 8NaCN + O₂ + 2H₂O → 4Na[Au(CN)₂] + 4NaOH
2. 2Na[Au(CN)₂] + Zn → Na₂[Zn(CN)₄] + 2Au
2) Название комплексных соединений:
Na[Au(CN)₂] - дицианоаурат(I) натрия
Na₂[Zn(CN)₄] - тетрацианоцинкат(II) натрия
3) Диссоциация и констант нестойкости:
1. Na[Au(CN)₂] :
Диссоциация:
Na[Au(CN)₂] ⇄ Na⁺ + [Au(CN)₂]⁻ - Первичная диссоциация
[Au(CN)₂]⁻ ⇄ Au⁺ + 2CN⁻ - Вторичная диссоциация
Констант нестойкости:
1) [Au(CN)₂]⁻ ⇄ [Au(CN)] + CN⁻
Kнест. ₁ = ( [[Au(CN)]] × [CN⁻] ) / [[Au(CN)₂]⁻]
2) [Au(CN)] ⇄ Au⁺ + CN⁻
Kнест. ₂ = ( [Au⁺] × [CN⁻] ) / [[Au(CN)]]
3) [Au(CN)₂]⁻ ⇄ Au⁺ + 2CN⁻ - Общее
Kнест. общ. = ( [Au⁺] × [CN⁻]² ) / [[Au(CN)₂]⁻]
2. Na₂[Zn(CN)₄] :
Диссоциация:
Na₂[Zn(CN)₄] ⇄ 2Na⁺ + [Zn(CN)₄]²⁻ - Первичная диссоциация
[Zn(CN)₄]²⁻ ⇄ Zn²⁺ + 4CN⁻ - Вторичная диссоциация
Констант нестойкости:
1) [Zn(CN)₄]²⁻ ⇄ [Zn(CN)₃]⁻ + CN⁻
Kнест. ₁ = ( [[Zn(CN)₃]⁻] × [CN⁻] ) / [[Zn(CN)₄]²⁻]
2) [Zn(CN)₃]⁻ ⇄ [Zn(CN)₂] + CN⁻
Kнест. ₂ = ( [[Zn(CN)₂]] × [CN⁻] ) / [[Zn(CN)₃]⁻]
3) [Zn(CN)₂] ⇄ [Zn(CN)]⁺ + CN⁻
Kнест. ₃ = ( [[Zn(CN)]⁺] + [CN⁻] ) / [[Zn(CN)₂]]
4) [Zn(CN)]⁺ ⇄ Zn²⁺ + CN⁻
Kнест. ₄ = ( [Zn²⁺] + [CN⁻] ) / [[Zn(CN)]⁺]
5) [Zn(CN)₄]²⁻ ⇄ Zn²⁺ + 4CN⁻ - Общее
Kнест. общ. = ( [Zn²⁺] × [CN⁻]⁴ ) / [[Zn(CN)₄]²⁻]
Решено от : DK954
Объяснение:
1) Соответствующие уравнение реакции:
1. Au + 8NaCN + O₂ + 2H₂O → 4Na[Au(CN)₂] + 4NaOH
2. 2Na[Au(CN)₂] + Zn → Na₂[Zn(CN)₄] + 2Au
2) Название комплексных соединений:
Na[Au(CN)₂] - дицианоаурат(I) натрия
Na₂[Zn(CN)₄] - тетрацианоцинкат(II) натрия
3) Диссоциация и констант нестойкости:
1. Na[Au(CN)₂] :
Диссоциация:
Na[Au(CN)₂] ⇄ Na⁺ + [Au(CN)₂]⁻ - Первичная диссоциация
[Au(CN)₂]⁻ ⇄ Au⁺ + 2CN⁻ - Вторичная диссоциация
Констант нестойкости:
1) [Au(CN)₂]⁻ ⇄ [Au(CN)] + CN⁻
Kнест. ₁ = ( [[Au(CN)]] × [CN⁻] ) / [[Au(CN)₂]⁻]
2) [Au(CN)] ⇄ Au⁺ + CN⁻
Kнест. ₂ = ( [Au⁺] × [CN⁻] ) / [[Au(CN)]]
3) [Au(CN)₂]⁻ ⇄ Au⁺ + 2CN⁻ - Общее
Kнест. общ. = ( [Au⁺] × [CN⁻]² ) / [[Au(CN)₂]⁻]
2. Na₂[Zn(CN)₄] :
Диссоциация:
Na₂[Zn(CN)₄] ⇄ 2Na⁺ + [Zn(CN)₄]²⁻ - Первичная диссоциация
[Zn(CN)₄]²⁻ ⇄ Zn²⁺ + 4CN⁻ - Вторичная диссоциация
Констант нестойкости:
1) [Zn(CN)₄]²⁻ ⇄ [Zn(CN)₃]⁻ + CN⁻
Kнест. ₁ = ( [[Zn(CN)₃]⁻] × [CN⁻] ) / [[Zn(CN)₄]²⁻]
2) [Zn(CN)₃]⁻ ⇄ [Zn(CN)₂] + CN⁻
Kнест. ₂ = ( [[Zn(CN)₂]] × [CN⁻] ) / [[Zn(CN)₃]⁻]
3) [Zn(CN)₂] ⇄ [Zn(CN)]⁺ + CN⁻
Kнест. ₃ = ( [[Zn(CN)]⁺] + [CN⁻] ) / [[Zn(CN)₂]]
4) [Zn(CN)]⁺ ⇄ Zn²⁺ + CN⁻
Kнест. ₄ = ( [Zn²⁺] + [CN⁻] ) / [[Zn(CN)]⁺]
5) [Zn(CN)₄]²⁻ ⇄ Zn²⁺ + 4CN⁻ - Общее
Kнест. общ. = ( [Zn²⁺] × [CN⁻]⁴ ) / [[Zn(CN)₄]²⁻]
Решено от :