types of reactions name each type of (unbalanced) reaction... ch₄ + o₂ → co₂ + h₂o fe + o₂ → fe₂o₃ na + h₂o → h₂ + naoh double replacement single replacement combustion combination decomposition drag

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# Brief Explanations:
- For $CH_4 + O_2
ightarrow CO_2 + H_2O$: Methane ($CH_4$) reacting with oxygen ($O_2$) to form carbon dioxide ($CO_2$) and water ($H_2O$) is a combustion reaction. Combustion reactions involve a substance reacting with oxygen, often producing carbon dioxide and water (if the reactant contains carbon and hydrogen).
- For $Fe+O_2
ightarrow Fe_2O_3$: Iron ($Fe$) and oxygen ($O_2$) combining to form iron(III) oxide ($Fe_2O_3$) is a combination reaction. In a combination reaction, two or more substances react to form a single product.
- For $Na + H_2O
ightarrow H_2+NaOH$: Sodium ($Na$) reacting with water ($H_2O$) to produce hydrogen gas ($H_2$) and sodium hydroxide ($NaOH$) is a single - replacement reaction. In a single - replacement reaction, an element reacts with a compound and replaces one of the elements in the compound.

# Answer:
1. Combustion
2. Combination
3. Single Replacement

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