Ngā Whāinga Ako ^🔗

8. Write the word equation for complete combustion
9. Write the balanced symbol equation for complete combustion

Mahi Tuatahi ^🔗

1. What are some key observations that would indicate incomplete combustion?
2. What are some key observations that would indicate complete combustion?

Keywords ^🔗

• Reactants: Butane, oxygen, hydrogen, vinegar etc.
• Products: Carbon dioxide, water, carbon etc.
• Chemical Compound: $H_{2}O$, $CO_{2}$, $NH_{3}$, $NaCl$ etc.
• Atom/Molecule: H, C, O, Au, Ca

Question ^🔗

What happens to the atoms/molecules during a chemical reaction?

• No new atoms are created or destroyed
• Mass of the reactants = mass of the products
• The reactants change molecular structure
• Two or more new products are made
• The atoms are rearranged
• Energy can be produced if bonds are broken (combustion)

Complete Combustion of Methane ^🔗

Complete the word and balanced symbol equation for this reaction.

\begin{aligned} methane \quad + \quad oxygen &\rightarrow \hspace{2cm} + \hspace{2cm} \newline CH_{4} \quad + \quad O_{2} &\rightarrow \hspace{2cm} + \hspace{2cm} \newline \end{aligned}

Answer ^🔗

Complete combustion of methane:

\begin{aligned} methane \quad + \quad oxygen &\rightarrow \quad \text{carbon dioxide} + \quad water \newline CH_{4} \quad + \quad O_{2} &\rightarrow \quad CO_{2} + \quad H_{2}O \newline CH_{4} \quad + \quad 2O_{2} &\rightarrow \quad CO_{2} + \quad 2H_{2}O \text{ (balanced)} \end{aligned}

Balance these reactions: ^🔗

\begin{aligned} & C \quad + \quad O_{2} \rightarrow \quad CO_{2} \newline & H_{2} \quad + \quad O_{2} \rightarrow \quad H_{2}O \newline & N_{2} \quad + \quad H_{2} \rightarrow \quad NH_{3} \newline & CH_{4} \quad + \quad O_{2} \rightarrow \quad CO_{2} + \quad H_{2}O \end{aligned}

Answer ^🔗

\begin{aligned} & C \quad + \quad O_{2} \rightarrow \quad CO_{2} \newline & 2H_{2} \quad + \quad O_{2} \rightarrow \quad 2H_{2}O \newline & N_{2} \quad + \quad 3H_{2} \rightarrow \quad 2NH_{3} \newline & CH_{4} \quad + \quad 2O_{2} \rightarrow \quad CO_{2} + \quad 2H_{2}O \end{aligned}

Extra Work ^🔗

1. Page 9: Fuels & Combustion
2. Balancing Equations Worksheet