Question

1. Write Balanced Chemical Equations for the Following Reactions.

A) Aluminium + Copper chloride Aluminium chloride + Copper

B) Copper + Silver nitrate Copper nitrate + Silver

C) Magnesium oxide + Hydrochloric acid Magnesium Chloride + Water

D) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water

E) Zinc carbonate(s) Zinc oxide(s) + Carbon dioxide(g)

2. Balance the following chemical equations: .

A) Pb(NO3)2+ KI KNO3+PbI2

B) BaCl2+ Al2(SO4)3 AlCl3+ BaSO4

C) NH3+O2

N2 +H2O

D) BaCl2 +NA2SO4 BaSO4+ NaCl

E) Mg +O2 MgO

3. What happens when: .

a) Hydrochloric acid reacts with Sodium Hydroxide

b) Hydrogen gas and Chlorine gas combine together.

c) Magnesium ribbon burns.

d) Silver is exposed to Hydrogen sulphide for a long time.

e) Quick lime is mixed with water.

f) Silver bromide will be exposed to the sunlight.

Answer 1

2Al + 3CuCl2 = 2AlCl3 + 3Cu

Answer 2

Here are the answers:-

1):-
A) 2Al + 3CuCl2 ---> 2AlCl3 + 3Cu
B) Cu + Ag(NO3)2 ---> Cu(NO3)2 + Ag
C) MgO + 2HCl ---> MgCl2 +H2O
D) Ca(OH)2 +CO2 ---> CaCO3 +H2O
E) ZnCO3 (s) ---> ZnO + CO2

2):-
A) Pb(NO3)2 + 2KI ---> 2KNO3 + PbI2
B) 3BaCl2 +Al2(SO4)3 ---> 2AlCl3 + 3BaSO4
C) 2NH3 + O2 ---> N2 + 3H2O
D) BaCl2 + Na2SO4 ---> BaSO4 + 2NaCl
E) 2Mg + O2 ---> 2MgO

3):-
a) HCl +NaOH ---> NaCl + H2O
It is a neutralisation reaction in which a salt i.e. Nacl is formed.
b) H2 +Cl2 ---> 2HCl
When Hydrogen reacts with Chlorine Hydrochloric acid is formed.
c) 2Mg + O2 ---> 2MgO
When magnesium ribbon is burned in air, magnesium oxide is formed.
d) 2Ag + H2S ---> Ag2S + H2
Whwn silver is exposed to hydrogen sulphide, it turns black forming silver sulphide
e) CaO +H2O ---> Ca(OH)2
When Cao is mixed in water, Calcium hydroxide is formed.
f) AgBr ---> Ag + Br
When Silver Bromide is kept in sunlight it decomposes to silver and bromine.


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