10 minutes maximum An IB Periodic Table is required. 1. Which two species are the Brønsted-Lowry bases in the ionization of methylamine in water, as shown below? CH3NH2 + H2O ⇌ CH3NH3+ + OH- A.   CH3NH2 and OH- B.   CH3NH3+ and OH- C.   CH3NH2 and H2O D.   H2O and CH3NH3+ ? A B C D 2. What is the conjugate base of HCO3- ? A.   CO2 B.   CO3- C.   CO32- D.   H2CO3 ? A B C D 3. Consider the following reaction in a phosphate buffer: H2PO4- + H2O ⇌ HPO42- + H3O+ Which of the following statements is correct? A.   H2PO4- is a conjugate acid of HPO42- . B.   H3O+ is a conjugate base of H2O. C.   H2PO4- and H2O are a conjugate acid-base pair. D.   Water acts as a Brønsted-Lowry acid in the forward reaction. ? A B C D 4. Which two species in the following equation act as Brønsted-Lowry acids? H2SO4 + HNO3 ⇌ HSO4- + H2NO3+ A.   H2SO4 and HNO3 B.   HNO3 and H2NO3+ C.   H2SO4 and HSO4- D.   H2SO4 and H2NO3+ ? A B C D 5. Which of the following word equations are correct for forming potassium chloride salt? I. potassium + hydrochloric acid  → potassium chloride + oxygen II. potassium hydroxide + hydrochloric acid  → potassium chloride + water III. potassium hydrogencarbonate + hydrochloric acid  → potassium chloride + carbon dioxide + water A.   I and II only B.   I and III only C.   II and III only D.   I, II and III ? A B C D 6. Which of the following word equations is correct for making ammonium nitrate salt? flickr A. ammonia + nitric acid  → ammonium nitrate B. ammonia + nitric acid  → ammonium nitrate + water C. ammonium hydroxide + nitric acid  → ammonium nitrate + hydrogen + water D. ammonium hydroxide + sodium nitrate  → ammonium nitrate + sodium hydroxide ? A B C D 7. Which of the following statements about acids is true? A.   All metals can react with acids to form salt and hydrogen. B.   Acids are substances which all contain oxygen. C.   Acids always have a pH of more than 7 in aqueous solutions. D.   An acid reacts with a base to form salt and water. ? A B C D 8. Which combination of compounds below can react to form sodium sulphate(VI) salt? A.   Na and H2S B.   Na and SO2 C.   NaOH and H2SO4 D.   NaHCO3 and H2SO3 ? A B C D 9. Which of the following species is not amphiprotic? A.   H2O B.   HCO3- C.   HSO3- D.   SO42- ? A B C D 10. In the dissociation of sulphuric acid in water, as shown by the equations below, which species is amphiprotic? H2SO4 + H2O  → HSO4- + H3O+ HSO4- + H2O ⇌ SO42- + H3O+ A.   H2O B.   SO42- C.   HSO4- D.   H2SO4 ? A B C D