Предмет: Химия, автор: kriper97

Решите пожалуйста 15 реакцию по химии

Приложения:

Ответы

Автор ответа: grimm1245

Br2⁰ + 2e = 2Br¹- | 3

Cr³+ -3e = Cr⁶+ | 2

3Br2 + 2Cr³ = 6Br¹ + 2Cr⁶

Cr2O3 + 3Br2 + 10NaOH = 2Na2CrO4 + 6NaBr+ 5H2O

В ОВР не всегда коэффициенты совпадают или полностью прописывабтся, пожтому в конце нужно все таки считать и некоторое добавлять

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: Аноним

1. When we arrived, the local people ....... us that it ........ non-stop for the past week.
told/had been snowing
were telling/snowed
tell/ has been snowing
told/ had snowed

2. I'd really ....... to your wedding.
like coming
love to come
liked to come
love not coming

3. Can you imagine ...... in Maiami for a year?
living
to live
live
to living

4. Where are you going? it's too cold ..... out today.
to go
going
not to go
go

5. You ..... use your mobile phone during the examinations, it's agaist the rules.
can't
don't have to
mustn't
shouldn't

6. Hey, do you ...... a DVD tonight?
fancy watching
want watching
like watching
love to watch

7.When did Paul ...... ? Last month, isn't it great?
stopped smoking
stop to smoke
stop smoking
stopped to smoke

8. I like watching snooker but I don't understand all the rules of the .... .
competition
match
game
race

9. It isn't ...... to the sea yet.
warm enough to go
too warm to go
warm going
warm enough go

10. I can't afford ...... too much money on the holiday this year, so I think I'll go camping.
spend
spending
to spend
I spend

11. Did you remember ...... your mother on her birthday or did you forget about it?
calling
call
to call
called

12. I don't remember ...... you before.
meeting
to meet
how meeting
to have met

13. Do you think they ....... the costruction of the tunnel by the end of this year?
will finish
will be finishing
will have finished
will have been finishing

14. I'm ...... until the end of the month.
moving
not moving
to be moving
not move

15.They suggested ..... the children to the new aquarium.
in taking
taking
to take
to taking

16. I don't know how ..... a worksheet.
download
downloading
to download
I download

17. I will move into my new house as soon as they ....... painting it.
finish
will finish
are finishing
are about to finish

18. Be careful! Do you know how to ........ the car engine?
take place
take apart
take part
take turns in

19. I ...... in the New York City Marathon next month.
am going to run
run
will have run
will be running

20. You should ...... up late at night.
to avoid staying
avoid staying
avoid to stay
avoid not to stay

21. I ........ David's enthusiasm for extreme sports, he didn't really appreciate my surprise gift of a paragliding training session.
overheard
overdid
overestimated
overlooked

22. The school is planning to ...... to stop students from using their mobiles during classes.
take measures
take advantage
take care
take notice

23. Fred ....... . He wants to be a chef.
enjoys cooking
doesn't enjoy cooking
enjoys to cook
doesn't enjoy to cook

24. This time tomorrow I ...... to Paris.
will have flown
will be flying
will fly
am flying

25. I feel ......... out with friends tonight.
like going
like to go
like go
going

26. As a teenager, I ....... things that my parents didn't approve of.
used to do
did
was doing
had done

27. While we ......., we ......... some whales playing in the ocean.
were kayaking/ saw
had kayaked/ saw
were kayaking/ had seen
had been kayaking/ would see

28. In the past household chores were very .... .
time-consuming
complicated
inconvenient
radical

29. The scyscrapers ..... places of residence with different work environments.
will combine
combines
will be combining
will have combined

30. ....... do you prefer: the red or the blue sneakers?
where
which
what
when

31. I believe wild animals should live in their natural ......, not in zoos.
habitat
home
house
residence

32. You ........ wake up late again or you will lose your job.
had better not
don't have to
had better not to
may not

33. I'm looking forward ...... from you soon.
to hear
to hearing
hearing
hear

34. Everybody was ....... when they heard the loud explosion.
terrifying
terrifyed
terrific
terrified

35. ....... you please turn down the volume? I'mtrying to concentrate on my homework.
should
could
must
may

36. Our teacher made us ...... the test.
retaking
to retake
retake
retook

37. By one o'clock I ...... for four hours.
will have been driving
will be driving
will drive
am going to drive

38. It was Gwen who persuaded ....... for this job.
applying
me apply
me to apply
me applying

39. She will call you before she ..... .
comes
come
is coming
will come

40. It's important to set ...... for yourself, so you have something to work towards.
an example
standards
a task
a goal

41. I prefer living in the city centre, because there isn't anything to do in the ........ .
outskirts
neighbourhood
suburbs
zone

42. Paul left ....... goodbye last hight.
to tell
without saying
not saying
not to tell

43. My classmates and I ...... a wonderful winter holiday last year.
had
were having
have had
would have

44. He changed his mind and decided ........ after all.
to come
coming
not coming
to came

45. Tom denied ....... anything to do with the bank robbery.
to have
having
not to have
not having

46. Please fasten your seatbelts. Our plane ..... .
will land
will be landing
is about to land
is due to land

47. Alice lost her ...... with her young son because he kept nagging her to buy him a a candy.
optimism
strength
endurance
patience

48. Henry ......... by the time the moon ...... in the sky.
was falling asleep/ rose
had fallen asleep/ rose
fell asleep/ was rising
had been falling asleep/ was rising

5 лет назад

Предмет: Геометрия, автор: idead5577

Сторони трикутника 25, 29, 36см знайти найменшу висоту трикутника

5 лет назад

Предмет: Алгебра, автор: nadezdakolisova169

. ПОМОГИТЕ СРОЧНО ПОЖАЛУЙСТА

5 лет назад

Предмет: Геометрия, автор: Аноним

столица кении,египта?

самый большой в африке город ?

8 лет назад

Предмет: Литература, автор: realtrapshit

(срочно!)Романтический характер в песне о купце Калашникове.

8 лет назад