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Periodic Classification Of Elements

Question
CBSEENSC10010571
Wired Faculty App

While writing the chemical reaction for the oxidation of calcium in oxygen, a student wrote the following balanced equation:

Ca + O→ CaO
Is it correct? If not, explain and write the correct balanced equation.

Solution

Ca + O→ CaO
Above given equation is not correct because Oxygen must be written in molecular form such as O2 
thus the balance chemical equation is,
2Ca +O2→ 2CaO

Some More Questions From Periodic Classification of Elements Chapter

How will you know whether a chemical reaction has taken place?

How would you justify that a chemical reaction has taken place in the following cases:
(i)    Burning of magnesium ribbon in air.
(ii)    Addition of lead nitrate solution to potassium iodide solution.
(iii)    Addition of dilute hydrochloric acid to zinc granules.

How do you show that respiration is a chemical change?

Why is it necessary to obtain a balanced chemical equation?

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.

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