AP Chemistry Unit 4 practice questions: Chemical Reactions
8 original multiple-choice questions on AP Chem Unit 4, chemical reactions. Answer each one in your browser and read the explanation, then review the key ideas below.
Question 1 of 8
Solutions of AgNO₃ and NaCl are mixed and a white precipitate forms. What is the net ionic equation?
Question 2 of 8
For 2H₂ + O₂ → 2H₂O, how many moles of water form from 4.0 mol of H₂ with excess O₂?
Question 3 of 8
What is the oxidation number of manganese in KMnO₄?
Question 4 of 8
2.0 mol of H₂ react with 2.0 mol of O₂ to form water (2H₂ + O₂ → 2H₂O). Which is the limiting reactant?
Question 5 of 8
What type of reaction is Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)?
Question 6 of 8
When C₃H₈ + O₂ → CO₂ + H₂O is balanced with the smallest whole numbers, what is the coefficient of O₂?
Question 7 of 8
In the Brønsted-Lowry definition, an acid is
Question 8 of 8
A reaction should produce 20.0 g of product but only 15.0 g is collected. What is the percent yield?
Key ideas in Unit 4
- Physical changes alter form; chemical changes make new substances. Net ionic equations leave out spectator ions.
- Stoichiometry uses mole ratios from the balanced equation. The limiting reactant runs out first and sets the amount of product.
- Percent yield = actual ÷ theoretical × 100.
- Reaction types: acid-base (proton transfer), redox (electron transfer, tracked with oxidation numbers) and precipitation.
- Titrations use a known concentration to find an unknown one at the equivalence point.
More AP Chem practice
← Unit 3: Properties of Substances and Mixtures
Unit 5: Kinetics →
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