AP Chemistrymediummcq1 pt
Ba(OH)₂(aq) + 2HCl(aq) → BaCl₂(aq) + 2H₂O(l) is best classified as which type of reaction?
A.Double replacement (neutralization)
B.Single replacement
C.Combustion
D.Decomposition
Explanation
Core Concept
The two starting compounds exchange partners: hydroxide teams with hydrogen to build water while barium bonds to chloride, yielding salt plus water, the signature of acid-base neutralization. Neutralizations proceed through this ion-swap mechanism, which places them squarely inside the double-replacement family. Recognizing partner exchange separates this from displacement by a free element.
Correct Answer
ADouble replacement (neutralization)
More Unit 4: Chemical Reactions practice questions
- easyWhat is the oxidation number of carbon in CO₃²⁻?
- mediumHow many grams of HCl (36.5 g/mol) react completely with 4.0 g of NaOH (40.0 g/mol)?
- easyIn 4Fe + 3O₂ → 2Fe₂O₃, which element is reduced?
- easyWhich observation is evidence of a physical change only?
- medium2.0 mol of N₂ and 2.0 mol of H₂ react via N₂ + 3H₂ → 2NH₃. How many moles of H₂ remain after complete reaction?
Practice more AP Chemistry questions with full explanations
Practice Unit 4: Chemical Reactions Questions →