The type of reaction that can only take place when one or both of the reactants is in elemental form is a combination reaction.
A Combination reaction occurs when an element reacts with another element or an element/compound reacts with another compound to form a single compound as a product.
Examples include:
The reaction between aluminum and oxygen.
- [tex]\mathbf{4Al + 3O_2 \to 2Al_2O_3}[/tex]
The reaction between ammonia and hydrochloric acid.
- [tex]\mathbf{NH_3_{(g)} + HCl \to NH_4 Cl_{(g)}}[/tex]
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