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Periodic Classification Of Elements

Question
CBSEENSC10010557
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Why is it necessary to obtain a balanced chemical equation?

Solution
Law of conservation of mass is applied here. Accordingly matter can neither be created nor destroyed. Thus during a chemical reaction the total mass of the reactants and products remains the same. Therefore, for a complete chemical equation, the number of atoms of various elements on both sides is made equal, i.e., the equation is balanced.

Some More Questions From Periodic Classification of Elements Chapter

Balance the following skeleton equations:
(i)    KClO3 →KCl + O2
(ii)    Na2CO3 + HCl → NaCl + H2O + CO2
(iii)    CH4 + O2 → CO2 + H2O
(iv)    NaCl + H2SO4 → Na2SO4 + HCl
(v)    Fe + H2O → Fe3O4 + H2
(vi)    H2S + O2 → H2O + S
(vii)    H2 + N2 →NH3.

Balance the following chemical equations:
(i)    NaOH + H2SO4 → Na2SO4 + H2O
(ii)    HNO3 + Ca(OH)2 → Ca(N03)2 + H2 O
(iii)    FeCl2 + H2S → HCl + FeS 

What does a balanced chemical equation convey to a chemist?

list the limitations of chemical equation.

What are the essentials of a chemical equation?

What information is available from the following equation:
CaCO3 + 2HCl→ CaCl2 + H2O+ CO2

What is a thermochemical equation? Give two examples.

Write and balance the following equations presented to you as written statements:

(i) Magnesium carbonate plus hydrochloric acid produces magnesium chloride plus water plus carbon dioxide gas.
(ii)    Aluminium plus chlorine gas produces aluminium trichloride.
(iii)    Nitrogen plus hydrogen produces ammonia.
(iv)    Calcium plus sulphur produces calcium sulphide.
(v)    Magnesium burns in CO2 to form magnesium oxide and carbon.

H2 + O → H2O is a balanced chemical equation. It is considered to be incorrect. Why?

Complete and balance the following equations:

(i)    NaOH +................→ Na2SO4 + H2O

(ii)    Ca(OH)2 +................ → CaCO3 + H2O

(iii)    ................ + HCl(aq) → MgCl2(aq) +.................

(iv)    ................ + Na2SO4(aq) → BaSO4(s) + NaCl(aq)

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