Chapter 11.2, Problem 21LC

(a)

Interpretation Introduction

Interpretation: To determine the type of chemical reaction.

Concept Introduction: When more than one atom or molecule will get combined, they will form a different kind of atom or molecule. This process is named a chemical reaction.

Answer to Problem 21LC

This is a kind of combustion

Explanation of Solution

The given chemical reaction is :

  ${\text{C}}_{\text{3}}{\text{H}}_{\text{6}}{\text{+O}}_{\text{2}}\to {\text{CO}}_{\text{2}}{\text{+H}}_{\text{2}}\text{O}$

The above reaction is a combustion reaction. In the above reaction, the reactant side has 3 carbon atoms, 6 hydrogen atoms, and 2 oxygen atoms while on the product side we have 1 carbon atom, 3 oxygen atoms, and 2 hydrogen atoms. If we multiply 2 to ${\text{C}}_{\text{3}}{\text{H}}_{\text{6}}$ and 9 to ${\text{O}}_{\text{2}}$ in the reactant side and 6 to ${\text{CO}}_{\text{2}}$ and 6 to ${\text{H}}_{\text{2}}\text{O}$ in the product side, we get a balanced chemical equation:

  ${\text{2C}}_{\text{3}}{\text{H}}_{\text{6}}{\text{+9O}}_{\text{2}}\to 6{\text{CO}}_{\text{2}}{\text{+6H}}_{\text{2}}\text{O}$

  $$

(b)

Interpretation Introduction

Interpretation: To determine the type of chemical reaction.

Concept Introduction: When more than one atom or molecule will get combined with each other then they will form a different kind of atom or molecule. This process is named a chemical reaction.

Answer to Problem 21LC

This is a kind of decomposition reaction.

Explanation of Solution

The given chemical reaction is,

  ${\text{Al(OH)}}_{\text{3}}\to {\text{Al}}_{\text{2}}{\text{O}}_{\text{3}}{\text{+H}}_{\text{2}}\text{O}$

Above reaction is decomposition reaction. In above reaction, reactant side 3 oxygen atoms, 3 hydrogen atoms and 1 Aluminium atom while the product side 2 Aluminium atoms, 4 oxygen atoms and 2 hydrogen atoms. If multiply 2 to ${\text{Al(OH)}}_{\text{3}}$ in reactant side and 3 to ${\text{H}}_{\text{2}}\text{O}$ in product side, the balanced chemical equation will be:

  ${\text{2Al(OH)}}_{\text{3}}\to {\text{Al}}_{\text{2}}{\text{O}}_{\text{3}}{\text{+3H}}_{\text{2}}\text{O}$

(b)

Interpretation Introduction

Interpretation: To determine the type of chemical reaction.

Concept Introduction: When more than one atom or molecule will get combined, they will form a different kind of atom or molecule. This process is named a chemical reaction.

Answer to Problem 21LC

This is a kind of combination reaction.

Explanation of Solution

The given chemical reaction is:

  ${\text{Li+O}}_{\text{2}}\to {\text{Li}}_{\text{2}}\text{O}$

The above reaction is a combination reaction. In the above reaction, the reactant side has 2 oxygen atoms and 1 lithium atom while on the product side 2 lithium atoms and 1 oxygen atom.

If multiply 4 to Li on the reactant side and 2 to ${\text{Li}}_{\text{2}}\text{O}$ in the product side, the balanced chemical equation will be:

  ${\text{4Li+O}}_{\text{2}}\to 2{\text{Li}}_{\text{2}}\text{O}$

(d)

Interpretation Introduction

Interpretation: To determine the type of chemical reaction.

Concept Introduction: When more than one atom or molecule will get combined, they will form a different kind of atom or molecule. This process is named a chemical reaction.

Answer to Problem 21LC

This is a kind of Single displacement reaction.

Explanation of Solution

The given chemical reaction is:

  ${\text{Zn+AgNO}}_{\text{3}}\to {\text{Ag+Zn(NO}}_{\text{3}}{\text{)}}_{\text{2}}$

The above reaction is a Single displacement reaction. In the above reaction, the reactant side has 1 zinc atom, 1 silver atom, and 1 nitrate molecule while the product side has 1 silver atom, 1 zinc atom, and 2 nitrate molecules.

If multiply 2 to ${\text{AgNO}}_{\text{3}}$ in the reactant side and 2 by Ag on the product side, the balanced chemical equation as:

  ${\text{Zn+2AgNO}}_{\text{3}}\to 2{\text{Ag+Zn(NO}}_{\text{3}}{\text{)}}_{\text{2}}$