1)1 (CaO+2HCl= CaCl2+H2O)
2)1 (2BaO+H2O=Ba(OH)2)
3) 4 (6H2SiO3+3Mg3(PO4)2=6MgSiO3+6H3PO4)
4) 1 (CO2+CaO=CaCO3)
5)
6)1 (AgNO3+HCl= AgCl+HNO3)
7)2 (т.к. СО -несолеобразующий оксид)
8) 3
9)4 (P2O5+Ca(OH)2=Ca3PO4)
10)4 (SiO3+KOH=KSiO3+H2O)
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) When we went shopping we wanted to buy ___ new. C) something
2) I’m sorry, but I haven’t got ___ advice to give you. B) any
3) He looked at the engine but he couldn’t see ____. C) anything
4) She had ___ free time after she retired than previously. A) more
5) We usually drink ___ water in hot weather. B) a lot of
6) He wants ___ sugar in his tea. B) a little
7) Those are ___ files. A) Bill’s
8) There is ___ in our garden. A) a nest of a bird
9) This is these _____ ball. C) boys’
10) Ann had to use my ruler as she had left ___ at home. C) hers
11) The boys are with ___ mum today. C) their
12) Last Saturday we went fishing, but we didn’t catch many ___. B) fish
13) I can give you some money. ___ in my wallet. B) It is
14) Our two ___ are crying all the time. A) babies
<span>15) What do you need these ___ for? A) boxes </span>
Дано:
Fe(NO₃)₂
найти: w(Fe)
решение:
Mr(Fe(NO₃)₂) = 56 + 14·2 + 16·6 = 180
w(Fe) = Ar(Fe) ·n(Fe)\Mr(Fe(NO₃)₂) = 56·1\180 = 0,311 или 31,1\%
ответ:31,1\%
AII3 иодид алюминия имеет ионную связь растворимая соль