Предмет: Химия, автор: Salihog

Осуществите превращения:

Ca—»CaO—»Ca(OH)2

Cu—»CuO—»CuSO4

Ответы

Автор ответа: тайная

Ответ:

2Ca + O₂ = 2CaO

CaO + H₂O = Ca(OH)₂

2Cu + O₂ = 2CuO

CuO + H₂SO₄ =CuSO₄ + H₂O

Salihog: Спасибо

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: Аноним

Среди высоких гор есть прекрасное голубое озеро.Страшны над горным озером бури.Высокие волны гуляют на широком просторе.
В тихую ясную погоду спокойная глубокая озёрная гладь.Лёгкие волны прибоя ласково набегают на береговой чистый песок.После трудного пути приятно погрузиться в их прохладную влагу.
Прозрачны воды горного озера.В хорошую погоду на большой глубине видно озёрное дно.Маленькие пароходы совершают обычные рейсы по высокогорному озеру.Капитан парохода может показать место,где на дне озера лежит древний город.

1.Выполнить синтаксический разбор простого предложения: Страшны над горным озером бури.
2.Графически объяснить знаки препинания в сложном предложении.
3. Обозначить графически орфограммы.

2 года назад

Предмет: Английский язык, автор: ahmerovavarvarа

Toni Bently began her ballet lessons when she was three. When she was ten, she went to a New York school. 1_________. Now there were ballet lessons every day. and in her old school there was only one lesson a week. The pupils often went to the theatre. "I saw Swan Lake. It was wonderful. I wanted to become a great dancer." One day at the end of the school year in New York, her mother heard about the School of American Ballet. Toni went to that school. With five other girls she did some exercises. 2______________. She was the best girl. When Toni was eleven, her life changed. She got the role in a New York City Ballets performance. Toni and eight other young girls danced there. 3 « _________. It was very exciting». When Toni was thirteen, she had ballet dancing two or three times a day. 4_______________. She stayed at the School of American Ballet for seven years. When Toni was eighteen she joined the New York City « It was fantastic. But my first year was very difficult. 5___________________. Toni visited London, Paris, Copenhagen and other cities. But soon she decided to leave the ballet and started travelling. She went to Europe. 6____________. Now Toni Bently has become the author of several books about the famous ballerinas. Toni says now «Ballet has changed my life. Im happy that I was a ballet dancer of the New York City Ballet. a) There she decided to write a book. b) « I danced that role for four winters». c) I learnt thirty ballets that year. d) There she studied the usual subjects plus music, drama and dance. e) Dance became the most important part of her life. f) Toni did all the exercises really well. вставте слова и переведите плиз даю 30 баллов

2 года назад

Предмет: Русский язык, автор: Каринка072007

Предложение из слов:
Нина, украдкой прошла, рощу, в.
Помогите пожалуста!

Осуществите превращения:Ca—»CaO—»Ca(OH)2Cu—»CuO—»CuSO4

Ответы

Осуществите превращения:

Ca—»CaO—»Ca(OH)2

Cu—»CuO—»CuSO4