AP (Advanced Placement) · AP Chemistry

Structure, Reactions and Equilibrium

26 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 26 questions

  1. How many moles of water are in 36 grams of H2O? (molar mass 18 g/mol)
  2. Which element has the largest atomic radius?
  3. What is the ground-state electron configuration of an iron atom (atomic number 26)?
  4. What is the molecular geometry of ammonia, NH3?
  5. Which compound has the highest boiling point: HF, HCl, HBr or HI?
  6. A gas is held at constant temperature and its pressure is doubled. What happens to its volume?
  7. A reaction is second order in reactant A. What happens to the rate if the concentration of A is doubled?
  8. After three half-lives of a first-order reaction, what fraction of the reactant remains?
  9. What is the equilibrium constant expression for N2(g) + 3 H2(g) in equilibrium with 2 NH3(g)?
  10. The equilibrium constant of an exothermic reaction is measured at two temperatures. What happens to K when the temperature is raised?
  11. What is the pH of a 0.001 M solution of hydrochloric acid?
  12. A buffer contains equal concentrations of a weak acid and its conjugate base, and the pKa of the acid is 4.74. What is the pH of the buffer?
  13. In the titration of a weak acid with a strong base, what is the pH at the half-equivalence point?
  14. What happens to the solubility of silver chloride when sodium chloride is added to a saturated solution?
  15. A reaction is spontaneous at constant temperature and pressure when what condition is met?
  16. How much heat is needed to raise the temperature of 50 g of water by 10 degrees Celsius? (specific heat 4.18 J/g per degree Celsius)
  17. What does Hess's law state?
  18. How is the standard cell potential of a galvanic cell calculated?
  19. What is the oxidation number of chromium in K2Cr2O7?
  20. At which electrode does reduction occur in an electrolytic cell?
  21. How does electronegativity change across a period from left to right?
  22. How many sigma bonds and pi bonds are in a carbon-carbon double bond?
  23. How many grams of carbon dioxide form when 16 g of methane burns completely? (CH4 + 2 O2 gives CO2 + 2 H2O; C = 12, O = 16, H = 1)
  24. According to Graham's law, which gas effuses fastest at the same temperature?
  25. What does a catalyst do in a chemical reaction?
  26. Which has the greater entropy at the same temperature: one mole of water vapor or one mole of liquid water?

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