Question

Balance the following equations.
(a) Mg + H2SO4 → MgSO4 + H2
(b) CaCO3 + HCl → CaCl2 + H2O + CO2
(c) CaO + H2O → Ca(OH)2
(d) Ag + HNO3 → AgNO3 + H2O + NO2

Answer 1

Why do we balance Chemical Equations?

A chemical equation should always be balanced because the law of conservation of mass states that matter can neither be created nor destroyed so in a chemical equation the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the ...

(a) Mg + H2SO4 → MgSO4 + H2

Mg + H2SO4 --------> MgSO4 + H2

Already balanced

Magnesium + Sulfuric Acid = Magnesium Sulfate + Dihydrogen

(b) CaCO3 + HCl → CaCl2 + H2O + CO2

CaCO3 + HCl --------> CaCl2 + H2O +CO2

CaCO3 + 2HCl-------->CaCl2 +CO2+ H2O.

Balanced equation

Calcium Carbonate + Hydrogen Chloride = Calcium Chloride + Carbon Dioxide + Water

(c) CaO + H2O → Ca(OH)2

Already balanced

Calcium Oxide+water=Calcium hydroxide

(d) Ag + HNO3 → AgNO3 + H2O + NO2

Ag + HNO3 --------> AgNO3 + H2O + NO2. Ag +2HNO3 -------->AgNO3 + NO2 + H2O.

Silver + Nitric Acid = Silver Nitrate + Nitrogen Dioxide + Water

thankyou:)

Answer 2

MgH2So4 Mg So4 + H2

Mg 1 1

H2 2 2

so4 1 1

caco3-Hcl cacl+H2(o+co2)

ca 1 1

co3 1 1

H 1 2

cl 1 2

1×2