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Periodic Classification Of Elements

Question
CBSEENSC10010556
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How do you show that respiration is a chemical change?

Solution
During respiration, energy is released.Respiration is a form of oxidation.

Glucose is oxidised to CO2 and H2O (along with release of energy) at the cells by the oxygen from air we breathe in.

      C6H12O6 + 6O2 = 6CO2 + 6H2O+energy

Since glucose is converted into new products with different composition, respiration is a chemical change.

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?

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