Final answer:
The provided reaction equation K + MgBr → KBr + Mg, should consider MgBr2 for balance, resulting in the reaction: 2 K + MgBr2 → 2 KBr + Mg. This represents a single replacement reaction.
Step-by-step explanation:
The balanced chemical equation for the reaction K + MgBr → KBr + Mg is not correctly depicted because the formula MgBr is not typically a stable or commonly recognized chemical species. Instead, we can consider the formula MgBr2 (Magnesium bromide), which consists of one magnesium ion and two bromide ions. The balanced reaction for a single-displacement reaction involving potassium (K) and magnesium bromide (MgBr2) to produce potassium bromide (KBr) and magnesium (Mg) follows:
2 K + MgBr2 → 2 KBr + Mg
This equation is balanced as there are two potassium atoms, two bromide ions, one magnesium atom on both sides of the reaction equation. The reaction represents a single replacement reaction where potassium replaces magnesium in the compound.