Apex Learning chemistry 4.3.4 Quiz which of the following combustion reactions is balanced correctly
The Correct Answer and Explanation is :
To help with combustion reactions, I can explain the principles of balancing them, which should give you a strong foundation for understanding which options in your quiz might be balanced correctly.
Balancing Combustion Reactions
In a combustion reaction, a hydrocarbon (compound of carbon and hydrogen) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). These reactions are typically exothermic, releasing energy as heat or light. The general formula for a complete combustion reaction is:
[ \text{Hydrocarbon} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} ]
Steps to Balance
- Balance Carbon (C): Start by balancing the number of carbon atoms. Ensure the number of carbon atoms in the reactant side (hydrocarbon) matches the carbon atoms in CO₂ on the product side.
- Balance Hydrogen (H): Next, balance hydrogen atoms. Match the number of hydrogen atoms in the hydrocarbon with twice the number of water (H₂O) molecules.
- Balance Oxygen (O): Finally, balance oxygen atoms. Since oxygen appears in both CO₂ and H₂O, calculate the total oxygen atoms needed on the product side, and balance it with O₂ on the reactant side.
Example Reaction
For methane (CH₄), the balanced combustion reaction is:
[ \text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O} ]
Here:
- Carbon is balanced with 1 C on each side.
- Hydrogen is balanced with 4 H on each side.
- Oxygen is balanced with 4 O on each side (2 from O₂, and 2 O from H₂O).
If you provide the specific reaction options, I can guide you more precisely!