Question

types of reactions
jack cadman
chemistry lesson types of chemical reactions
a + bc → ac + b

zn(s) + cucl₂(aq) → cu(s) + zncl₂(aq)

mg(s) + 2 hi(aq) → mgi₂(aq) + h₂(g)

multiple - choice question
which type of atom is magnesium replacing in the compound?
magnesium
iodine
hydrogen
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Explanation:

Step1: Analyze the reaction

In the reaction \(Mg(s)+2HI(aq)\to MgI_{2}(aq)+H_{2}(g)\), magnesium (\(Mg\)) is reacting with hydroiodic acid (\(HI\)).

Step2: Identify the replacement

In a single - replacement reaction of the form \(A + BC\to AC + B\), magnesium (\(Mg\)) is replacing another element in the compound. In \(HI\), the elements are \(H\) (hydrogen) and \(I\) (iodine). Since \(Mg\) forms \(MgI_{2}\), it is replacing hydrogen.

Answer:

hydrogen