Question

methane is a compound that is a component of natural gas. natural gas is used in furnaces to heat homes through the chemical reaction shown below.

\\(\text{methane} + \text{oxygen} \
ightarrow \text{carbon dioxide} + \text{water}\\)

question 14

which of the following rows identifies the type of chemical reaction described and classifies the reaction as endothermic or exothermic?

\

$$\begin{array}{|c|l|l|} \\hline \\textbf{row} & \\textbf{type of chemical reaction} & \\textbf{classification} \\\\ \\hline \\bigcirc & \\text{corrosion} & \\text{exothermic} \\\\ \\hline \\bigcirc & \\text{corrosion} & \\text{endothermic} \\\\ \\hline \\bigcirc & \\text{combustion} & \\text{exothermic} \\\\ \\hline \\bigcirc & \\text{combustion} & \\text{endothermic} \\\\ \\hline \\end{array}$$

Explanation:

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<reasoning>

Identify the type of chemical reaction

The problem describes the reaction of methane with oxygen to produce carbon dioxide and water:
\[\text{methane} + \text{oxygen}
ightarrow \text{carbon dioxide} + \text{water}\]
A reaction where a substance reacts rapidly with oxygen, releasing heat and light, is classified as a combustion reaction.

Classify the reaction as endothermic or exothermic

Using the Exothermic Reaction and Endothermic Reaction knowledge points
\[

$$\begin{aligned} &\text{Furnace heating purpose} ightarrow \text{Releases heat to surroundings} \\ &\text{Heat released} ightarrow \text{Exothermic reaction} \end{aligned}$$

\]

Match the correct row from the options

Combining the two classifications:

• Type of Chemical Reaction: Combustion
• Classification: Exothermic

This corresponds to the third row in the table.
</reasoning>

<answer>
<mcq-option>Row 1: Corrosion, Exothermic</mcq-option>
<mcq-option>Row 2: Corrosion, Endothermic</mcq-option>
<mcq-correct>Row 3: Combustion, Exothermic</mcq-correct>
<mcq-option>Row 4: Combustion, Endothermic</mcq-option>
</answer>

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Answer:

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<reasoning>

Identify the type of chemical reaction

The problem describes the reaction of methane with oxygen to produce carbon dioxide and water:
\[\text{methane} + \text{oxygen}
ightarrow \text{carbon dioxide} + \text{water}\]
A reaction where a substance reacts rapidly with oxygen, releasing heat and light, is classified as a combustion reaction.

Classify the reaction as endothermic or exothermic

Using the Exothermic Reaction and Endothermic Reaction knowledge points
\[

$$\begin{aligned} &\text{Furnace heating purpose} ightarrow \text{Releases heat to surroundings} \\ &\text{Heat released} ightarrow \text{Exothermic reaction} \end{aligned}$$

\]

Match the correct row from the options

Combining the two classifications:

• Type of Chemical Reaction: Combustion
• Classification: Exothermic

This corresponds to the third row in the table.
</reasoning>

<answer>
<mcq-option>Row 1: Corrosion, Exothermic</mcq-option>
<mcq-option>Row 2: Corrosion, Endothermic</mcq-option>
<mcq-correct>Row 3: Combustion, Exothermic</mcq-correct>
<mcq-option>Row 4: Combustion, Endothermic</mcq-option>
</answer>

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