Предмет: Химия, автор: aleksandra2000140

кислород может быть получен:
1)разложением пергамента калия
2)взаимодействием метана с водой
3)взаимодействия натрия с водой
4)разложением пероксида водорода
5)разложением воды


00Angelok00: может пермангоната?
aleksandra2000140: ДА

Ответы

Автор ответа: 00Angelok00
0
Мы опыт в школе проводили такой, по-моему правильный 1)


aleksandra2000140: а точно не знаешь?
00Angelok00: Да первый только мы не пермангонат использовали. Нам после опыта сказали что можно получать разложением пермангоната калия) Так что первый выбирай
Похожие вопросы
Предмет: Английский язык, автор: gorbatovataisia
помогите ПОЖАЛУЙСТА

4 Задание: Complete. Use the correct form of
was, were and could.
Lizzie's life was difficult in England and she
and her parents 2............ very unhappy there.
People didn't like them because their religion
3........... different. Her parents wanted to go to
America but they (not) 4............... find a ship.
They tried to leave England on the Speedwell
but it (not) 5................ a good ship and they
(not) 6. ............. sail to America in it.

5 Задание: Complete John's diary. Use the Past Simple
or the Past Continuous.

10 September 1620
On September 6 I (leave) left England
on a ship called the Mayflower for America
I (talk) 2................. to another sailor when
I (see) 3.................. a pretty girl on the
deck. I (speak) ................... to her and
she (be) 5.................. very nice
14 September 1620
I (see) 6.................. the girl again.
She (walk) 7................ on the rock while
I (work) ................... I(not / speak)
9................... to her because the other
sailors (watch) 10.................. me.


3 Задание: Complete. Use the
Past Simple or the
Past Continuous.

1 The sun (shine) was shining
while the Pilgrims
(leave) were leaving.. England.

2 Lizzie (look) ..................... at England
when she (hear) ..................... a friendly
voice behind her.

3 Lizzie (see)....... John while he
(work) ..................... on the ship.

4.John (like) .................... Lizzie very much.

5 John and other sailors (work) .......
on the deck when a huge wave (come)
... over the side of the ship.


6 Lizzie (see) ...... the wave and
(scream)......
7 The wave (drag)........ John into
the sea


6 Задание:Circle the correct words.

Lizzie and her family began their ...........
across the sea. They 2........... to an unknown
3............. The 4........... was very good at
first. Then it changed. When the storm
started, Lizzie was 5............ about John.
She looked all over the ship but she ...
see him anywhere.

1 A voyage B trip C journey
2 A sailing B were sailing C are sailing
3 A space B part C place
4 A storm B weather C sun
5 A exciting B frightening C worried
6 A couldn't B could C can't