Question

27. Answer the following:
(a) Write the equation for each decompositior reaction in which energy is provided in the form
of heat, light and electricity.
(b) What is the difference between the displacement reaction and double displacement
-reaction? Write the chemical equation for these reactions.

Answer 1

Answer:

A) Heat:

2FeSO4=Fe2O3+SO2+SO3

Light:

2AgCl=2Ag+Cl2

Electricity:

2NaCl=2Na+Cl2

B)In a chemical reaction where the most reactive element displaces the least reactive element from its compound is known as displacement reaction.

Ex:CuSo4+Fe=FeSo4+Cu

In a chemical reaction where two elements displace each other to form new compounds is called double displacement reaction

Ex:Na2So4+BaCl2=BaSO4+2NaCl.

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Answer 2

$<i> In a displacement reaction, a more reactive element replaces a less reactive element from a compound.</p><p>For Example: CuSo4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s)</p><p>In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds.</p><p></p><p>For Example: Na2SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + 2NaCl (aq)</p><p>$