Questions: Balance the following equations and identify the type of reaction(4marks): - C2H6+O2 CO2+H2O 2 C2H6+7 O2 -> 4 CO2+6 H2O - Li+ O2 Li2O combustion 4 Li+O2 -> 2 Li2O synthesis - Al(NO3)3+SrCO3 Al2(CO3)3+Sr(NO3)2 2 Al(NO3)3+3 SrCO3 -> Al2(CO3)3+3 Sr(NO3)2 - NO2 NO+O2 Double displacement.

Balance the following equations and identify the type of reaction(4marks): - C2H6+O2 CO2+H2O 2 C2H6+7 O2 -> 4 CO2+6 H2O - Li+ O2 Li2O combustion 4 Li+O2 -> 2 Li2O synthesis - Al(NO3)3+SrCO3 Al2(CO3)3+Sr(NO3)2 2 Al(NO3)3+3 SrCO3 -> Al2(CO3)3+3 Sr(NO3)2 - NO2 NO+O2 Double displacement.
Transcript text: - Balance the following equations and identify the type of reaction(4marks): - $\mathrm{C}_{2} \mathrm{H}_{6}+\mathrm{O}_{2} \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$ \[ 2 \mathrm{C}_{2} \mathrm{H}_{6}+7 \mathrm{O}_{2} \rightarrow 4 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O} \] - $\mathrm{Li}^{+} \mathrm{O}_{2} \mathrm{Li}_{2} \mathrm{O}$ combustion $4 \mathrm{Li}+\mathrm{O}_{2} \rightarrow 2 \mathrm{Li}_{2} \mathrm{O}$ synthesis - $\mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}+\mathrm{SrCO}_{3} \quad \mathrm{Al}_{2}\left(\mathrm{CO}_{3}\right)_{3}+\mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2}$ $2 \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}+3 \mathrm{SrCO}_{3} \rightarrow \mathrm{Al}_{2}\left(\mathrm{CO}_{3}\right)_{3}+3 \mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2}$ d. $\mathrm{NO}_{2} \mathrm{NO}+\mathrm{O}_{2}$ Dooble displacement.
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Solution

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Solution Steps

Step 1: Balance the Combustion Reaction of Ethane

The given unbalanced equation is: \[ \mathrm{C}_{2} \mathrm{H}_{6} + \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} + \mathrm{H}_{2} \mathrm{O} \]

To balance it, we need to ensure the number of each type of atom is the same on both sides of the equation. The balanced equation is: \[ 2 \mathrm{C}_{2} \mathrm{H}_{6} + 7 \mathrm{O}_{2} \rightarrow 4 \mathrm{CO}_{2} + 6 \mathrm{H}_{2} \mathrm{O} \]

This is a combustion reaction, where ethane (\(\mathrm{C}_{2} \mathrm{H}_{6}\)) reacts with oxygen (\(\mathrm{O}_{2}\)) to produce carbon dioxide (\(\mathrm{CO}_{2}\)) and water (\(\mathrm{H}_{2} \mathrm{O}\)).

Step 2: Balance the Synthesis Reaction of Lithium Oxide

The given unbalanced equation is: \[ \mathrm{Li} + \mathrm{O}_{2} \rightarrow \mathrm{Li}_{2} \mathrm{O} \]

To balance it, we need to ensure the number of each type of atom is the same on both sides of the equation. The balanced equation is: \[ 4 \mathrm{Li} + \mathrm{O}_{2} \rightarrow 2 \mathrm{Li}_{2} \mathrm{O} \]

This is a synthesis reaction, where lithium (\(\mathrm{Li}\)) reacts with oxygen (\(\mathrm{O}_{2}\)) to form lithium oxide (\(\mathrm{Li}_{2} \mathrm{O}\)).

Step 3: Balance the Double Displacement Reaction

The given unbalanced equation is: \[ \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} + \mathrm{SrCO}_{3} \rightarrow \mathrm{Al}_{2}\left(\mathrm{CO}_{3}\right)_{3} + \mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2} \]

To balance it, we need to ensure the number of each type of atom is the same on both sides of the equation. The balanced equation is: \[ 2 \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} + 3 \mathrm{SrCO}_{3} \rightarrow \mathrm{Al}_{2}\left(\mathrm{CO}_{3}\right)_{3} + 3 \mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2} \]

This is a double displacement reaction, where aluminum nitrate reacts with strontium carbonate to form aluminum carbonate and strontium nitrate.

Final Answer

  • Combustion of Ethane: \(\boxed{2 \mathrm{C}_{2} \mathrm{H}_{6} + 7 \mathrm{O}_{2} \rightarrow 4 \mathrm{CO}_{2} + 6 \mathrm{H}_{2} \mathrm{O}}\)
  • Synthesis of Lithium Oxide: \(\boxed{4 \mathrm{Li} + \mathrm{O}_{2} \rightarrow 2 \mathrm{Li}_{2} \mathrm{O}}\)
  • Double Displacement Reaction: \(\boxed{2 \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} + 3 \mathrm{SrCO}_{3} \rightarrow \mathrm{Al}_{2}\left(\mathrm{CO}_{3}\right)_{3} + 3 \mathrm{Sr}\left(\mathrm{NO}_{3}\right)_{2}}\)
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