Вопрос школьника по предмету Химия
составить уравнение реакции:
С→СО→СО2→NaCO3→CaCO3→CO2
Ответ учителя по предмету Химия
CO2 + C = 2CO соединения
2CO + O2 = 2CO2 ОВР
CO2 + 2NaOH = Na2CO3 + H2O разложение
H2CO3 + Na2CO3 = 2NaHCO3 соединение
2NaHCO3 = Na2CO3 + CO2 + H2O ионная реакция
Na2CO3 = Na2O + CO2 разложение
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Надо составить задачу по уравнению:
9-10/2*x-45=15
Пожалуйста срочно надо
Даю 30 баллов
Перевод НЕ нужен
Fill in the blanks with prepositions or adverbs wherever necessary.
The girls went — the street and came — — the shop window. They stood looking — the only thing — the window, — a double rope of pearls.
«What do you think is the price — those pearls?» Annabel said.
«Oh, I don’t know, I wonder if they are — sale,» Midge answered.
«Go — and ask the price,» Annabel said.
«Well,» Midge said. «But you’ve got to come too.»
They walked — the shop and a clerk came — — them.
«It so happened that my friend and myself were passing — your shop,» Midge started. «And we were wondering how much are those pearls you’ve got — your window.»
«Ah, yes,» the clerk said. «The double rope. That is two hundred and fifty thousand dollars, Madam.»
«I see,» Midge said.
«Would you like to look — it?» «No, thank you. We were just passing —.» The clerk opened the door — them and they walked — — the shop.
They were silent and their eyes were cloudy. As they walked — — the street Midge said: «Two hundred fifty thousand! That’s a quarter — a million! Have you ever heard — anything like that!»