Question

1. ____ Ca (s) + ____ H2O (l) -->

2. ____ Mg (s) + ____ H2O (l) -->

3. ____ Al (s) + ____ H2O (l) --->

4.____ Zn (s) + ____ HCl (l) --->

5. ____ Pb (s) + ____ HCl (l) --->

6. ____ Cu (s) + ____ HCl (l) --->

7. ____ Al (s) + ____ NaNO3 (aq) --->

8. ____ Al (s) + ____ CuCl2 (aq) --->

9. ____ Cu (s) + ___ AgNO3 (aq) --->

double replacement reactions

1. ____NaCl (aq) + ___ KNO3 (ag) --->

2. ____ NaCl (aq) + ___ AgNO3 (aq) --->

3. ___ Na2CO3 (aq) + ___ HCl (aq) --->

4. ____ NaOH (aq) + ____ HCl (aq)

5. ____ BaCl2 (aq) + ____ H2SO4 (aq) --->

6. ____ Pb(NO3)2 (aq) + ____ K2CrO4 (aq) --->

7. ____ Fe(NO3)3 (aq) + ____ NaOH (aq) --->

8. ____ Cu(NO3)2 (aq) + ____ NaOH (aq)

Answer 1

1) When a metal is combined with water, a metallic hydroxide (it's basic) and H2 gas are formed.

Ca + 2H2O --> Ca(OH)2 + H2

H2O loses oxygen to become H2 and Ca gain

2) 2 Mg + 2 H₂O = 2 MgOH + H₂

3) 2Al + 6H₂O ---> 2Al(OH)₃ + 3H₂

4) Zn + 2 HCl ---> ZnCl2 + H2

5)  Pb + 2 HCl --> PbCl2 + H2 ....(for Pb 2+)

and if Pb4+ than reaction will be

Pb + 4 HCl --> PbCl4 + 2 H2

6) 2 Cu + 2 HCl + --> 2 CuCl + H2 ....(for Cu 1+)
and for Cu2+

Cu + 2 HCl --> CuCl2 + H2

7) Al + 3NaNO3 ----> 3Na + Al(NO3)3

8) 2Al + 3 CuCl2 ---> 2AlCl3 + 3 Cu

9) Cu + 2 AgNo₃ ----> Cu(No₃)₂ + 2 Ag

double displacement reaction

1) NaCl + KNO3 ---> KCl + NaNO3

2) NaCl + AgNO₃ ----> NaNO₃ + AgCl

3) Na2CO3 + HCl -----> CO2 + H2O + NaCl

4) HCl + NaOH ----> H2O + NaCl

5) BACl₂ + H₂SO₄ -----> BASO₄ + 2 HCl

6) Pb(No₃)₂ + K₂Cro₄ ----> PbCro₄ + 2 KNo₃

7) NaOH + Fe(NO₃)₂ ----> Na(NO₃)₂ + FeOH

8) Cu(NO₃)₂ + 2 NAOH -----> Cu(OH)₂ + 2 NANO₃