Question

question 1
the key to recognizing a combination reaction is...
○ there only ionic compounds present.
○ there are many reactions in a row.
○ there are multiple products and only one reactant.
○ there are multiple reactants and only one product.

Explanation:

A combination reaction (also known as a synthesis reaction) is defined as a chemical reaction where two or more reactants combine to form a single product. Let's analyze each option:

• "there only ionic compounds present": Combination reactions can involve non - ionic compounds too (e.g., \(H_2 + O_2

ightarrow H_2O\)), so this is incorrect.

• "there are many reactions in a row": This has nothing to do with the definition of a combination reaction.
• "there are multiple products and only one reactant": This describes a decomposition reaction, not a combination reaction.
• "there are multiple reactants and only one product": This matches the definition of a combination reaction, where multiple reactants combine to form a single product.

Answer:

D. there are multiple reactants and only one product.