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Ca(OH)2+H3PO4=Ca3(PO4)2+H2O

Al+HCl=AlCl3+H2

Сколько серебра осело на катоде электролизной установки, если процес электролиза длился 10 мин., а сила тока составляла 25 А

Напишите уравнения реакций: хлорид железа 2 ->нитрат железа 2 ->гидроксид железа 2 ->оксид железа2 -> сульфат железа 2

алюминий->хлорид алюминия ->гидроксид алюминия->сульфат алюминия->нитрат алюминия

Which is right? Complete the sentences

1. At the moment the delegation.....................................................( arrives/  is arriving/ will arrive) at the station.

2. The delegation....................................just..............................................(arrives/ arrived/ has arrived) at the station.

3. The delegation ............................................(arrives/arrived/ has arrived) at the station this morning.

4. The dealegation.............................. already .................................(arrives/arrived/ has arrived) at the station.

5. The delegation ................................................ (arrives/arrived/ has arrived) at the station two hours ago. 

6. I ....................................(stay/ am staying/ stayed) at the Sputnik Hotel. I' ll be happy to see you tonight. 

7. When I visit  Moscow I usually................................(stay/ am staying/ stayed) at the Sputnik Hotel.

8. I think next time he ............................. (stays/ is staying/ will stay) at the Sputnik Hotel.

9. I was in Moscow two years ago. I (stay/ stayed/ have stayed) at the Sputnik Hotel.

10. I ....................................never.............................(am staying/ stayed/ have stayed) at the Sputnik Hotel. Is it a good hotel?

Срочно!!!!!!!!!!!!