1.a)K2S+2HNO3=2KNO3+H2S↑
2K+ +S 2- +2H+ +2NO3- =2K+ +2NO3- + H2S↑
S2- +2H+ =H2S↑
b)3Ca(NO3)2+ 2H3PO4=Ca3(PO4)2↓+6HNO3
3Ca2+ +2NO3- +3H+ +2PO43-=Ca3(PO4)2↓+2H+ +3NO3-
3Ca2+ +2PO43- =Ca3(PO4)2↓
2.a)Na2SO3+2HCl=2NaCl+SO2+H2O
b)Ca(NO3)2+2nAOH=Ca(OH)2↓+2NaNO3
v)KI+AgNO3=KNO3+AgI↓
37 протонов (порядковый номер), количество нейтронов n= Ar-p. n= 85-37=48
а-2
Ca +2 NaOH=Ca(OH)2+2Na
<span>Ca + 2H2O=Ca(OH)2 +H2</span>
<span>2Ca+O2=2CaOб</span>
б-3
<span><span>KOH +NH4Cl=KCl+NH3+H2O</span></span>
<span><span><span>6KOH +P2O5=2K3PO4+3H2O</span></span></span>
<span><span><span><span>2KOH +CrO3=<span>K2CrO3+Н2O</span></span></span></span></span>
<span><span><span><span><span>в-2</span></span></span></span></span>
<span><span><span><span><span><span>SO2 +2NaOH=Na2SO3+H2O</span></span></span></span></span></span>
<span><span><span><span><span><span><span>SO2 +H2O=H2SO3</span></span></span></span></span></span></span>
<span>SO2 +O2=2SO3</span>
<span>г-5</span>
<span><span><span> ZnS + O2 = Zn+SO2</span></span></span>
<span><span><span><span> ZnS +2HСl=ZnСl2+H2S(газ)</span></span></span></span>
<span><span><span><span><span> ZnS + 2HNO3=Zn(NO3)2+H2S(газ)</span></span></span></span></span>
