Question

question 2 of 10
what happens in a single - replacement reaction?
a. two reactants combine to form one product.
b. two reactants exchange elements with each other.
c. one reactant breaks apart to form new compounds.
d. one reactant replaces an element in another reactant.

Explanation:

• Option A describes a combination reaction (two substances combine to form one).
• Option B describes a double - replacement reaction (two compounds exchange ions/elements).
• Option C describes a decomposition reaction (one compound breaks into simpler substances).
• Option D matches the definition of a single - replacement reaction, where one element (in a reactant) replaces another element in a compound (another reactant).

Answer:

D. One reactant replaces an element in another reactant.