Tuesday, 1 July 2014

Ответы С1 в ГИА 2014



Ответы С1 в ГИА
1.1) Cu(NO3)2 + Zn = Zn(NO3)2 + Cu  
 (или другой более активный, чем медь металл)   
 2) Cu + Cl2 = CuCl2                                                                                                              
 3) CuCl2 + 2NaOH = Cu(OH)2↓ + 2NaCl  
 (или другая щелочь: KOH; Ba(OH)2 т.д.)                   
 4) Cu 2+ + 2OH- = Cu(OH)2
2.1) 2Cu + O2 = 2CuO  2)CuO + 2HCl = CuCl2 + H2O 
 (или раствор другой сильной кислоты: HNO3;H2SO4) 
3) CuCl2 + Zn = ZnCl2 + Cu    
 (или другой более активный, чем медь металл)                             
 4) CuO + 2H+ = Cu 2+ + H2O
3.1) 2FeCl3 + Cu = 2FeCl2 + CuCl2
 2)FeCl2 + 2NaOH = Fe(OH)2↓ + 2NaCl                                                                             
 3) Fe(OH)2↓= FeO + H2O                                                                                                                       
 4) Fe 2+ + 2OH- = Fe(OH)2
4.1) 2HCl + Mg = MgCl2 + H2                                                                                                                
 2)MgCl2 + 2NaOH = Mg(OH)2↓ + 2NaCl                                                                                            
 3)Mg(OH)2 + H2SO4 = MgSO4 + 2H2O                                                                                           
 4)Mg(OH)2↓ + 2H+ = Mg 2+ + 2H2O
5.1) 2Na + O2 = 2Na2O2  или  
2Na + 2H2O = 2NaOH + H2                                                                    
2) 2Na2O2 + 2CO2 = 2Na2CO3 + O2  или 
 2NaOH + СO2 = Na2CO3 +  H2O                                          
3)Na2CO3 +  H2SO4 =   Na2SO4 + СO2↑ +  H2O                                                                                   
 4)CO32- + 2H+ = CO2 + H2O