[Last Name] 1
Chemical Systems and Equilibrium – Grade 12 Chemistry
Knowledge/Understanding
1. When solid barium phosphate is equilibrium with its ions, the ratio of barium ions to phosphate ions would be:
a. 1:1 b. 2:3 c. 3:2 d. 2:1 2. Which of the following can act as a Bronsted-Lowry acid or base in water? a. HCO3-(aq) c. HI(aq) b. OH--(aq) d. NH2--(aq) 3. In a saturated solution of ammonium carbonate, the concentration of ammonium ions is 13.1 mol/L. What is the � �� of ammonium carbonate? a. 4.5x103 4. The �a of H3PO4- is 7.1×10 a. 7.1×10 −3 d. 1.12x103 c. 343 . What is the �b of its conjugate base H2PO4- ? 11 c. 1.4x1012 −12 d. 7.1x10-11 b. 1.4×10
5. In b. 2.25x103 the following reaction, what are the two Bronsted­Lowry acids? a. b. NH3 and NH4+ NH3 and HCl c. HCl and Cl- d. HCl and NH4+ 6. For the equilibrium system below, which of the following would increase the concentration of � 2� (�)? a. Increased Temperature c. Decreased [CO] b. Decreased pressure d. Decreased container volume 7. For the equilibrium system below, which of the following would decrease the concentration of �� �3(�)? a. Increased Temperature c. Increased [���5] b. Decreased pressure d. Increased [��2] 8. The ��� expression for copper (II) sulfate is:
a. [�� 2+
2−[��
4 2+ 2
2− 2
b. [�� ] [��
4 2+ 2
2− [��4 ] c. [�� d. [����4] [Last Name] 2
9. Consider the following equilibrium:
2� �(�) + 26kJ ↔ �2(�) + �2(�) If some hydrogen gas were injected into the system at constant temperature and pressure, which of the following would mostly likely occur? a. Increased [HI] b. Increased [H2] e. Both a and c b. Decreased [HI] d. decreased [I2] f. Both a and d 10. Which of the following is true about a chemical system in equilibrium?
a. All chemical reactions have stopped
b. The concentration of reactants is equal to the concentration of products
c. The forward and reverse reaction rates become equal
d. The system will remain at equilibrium regardless of any external factors
11. What is the correct equilibrium constant equation for the following equilibrium? 12. Which of the following statements is verifiably true about this equilibrium?
���5(�) ↔ ���3(�) + ��2(�) K = 275 a. The reactants are favored in this reaction. b. ���5 will be in higher concentration than any other components. c. If a fixed container is filled with ���5 gas, the pressure of the container will decrease over time. d. ���3 will be in higher concentration than ���5 at equilibrium. 13. The pH of a 0.05M solution of H2SO4(aq) at 25°C is _____________. 14. The pH of a 0.20M solution of KOH at 25°C is ______________. 15. Write an equilibrium equation for the formation of a precipitate when iron (II) nitrate solution is combined with ammonium carbonate solution:
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