SCIENCE 101 > QUESTIONS & ANSWERS > Science 101. 2.3.5 Practice: Equilibrium and Kinetics Practice Assignment Chemistry Sem 2. Questions (All)

Science 101. 2.3.5 Practice: Equilibrium and Kinetics Practice Assignment Chemistry Sem 2. Questions and Answers.

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Question 1: Dynamic Equilibrium (4 points) A. What information does the equilibrium constant give? (1 point) B. What is the equilibrium constant of aA+bB cC +dD? (1 point) C. What does Le Châtelier's principle predict will happen to a system if equilibrium is upset in the following ways? (2 points) • Additional reactant is added. (0.5 point) Additional product is added. (0.5 point) ••• 2.3.5 Practice: Equilibrium and Kinetics Practice Assignment Chemistry Sem 2 (S5845216) Bryan 3Dewey • Heat is added. (0.5 point) Pressure is increased in a gaseous system. (0.5 point) ••••• Question 2: Acids and Bases (4 points) A. What information does an acid or base equilibrium constant give? (1 point) B. What is the acid dissociation constant for an acid at equilibrium, HX H+ + X–? (1 point) C. What is the base dissociation constant for a weak base at equilibrium, B + H2O BH+ + OH–? (1 point) D. According to Le Châtelier's principle, what would happen if the equilibrium of a weak acid or weak base were upset? (1 point) Question 3: pH and pOH (4 points) A. What information does the pH of a solution give? (1 point) B. What equation is used to calculate the pH of a solution? (1 point) C. What is the pOH equation? How can pOH be determined from pH? (1 point) D. What are the hydrogen ion and hydroxide ion concentrations in water? What is the pH and pOH of pure water? (1 point) Question 4: Acids and Bases (5 points) A. Match each term with its definition. (3 points) A. Arrhenius acid B. Arrhenius base C. Brønsted-Lowry acid D. Brønsted-Lowry base E. Lewis acid F. Lewis base B. Explain what a conjugate acid is and what a conjugate base is. (1 point) C. What is the function of a buffer? What is a buffer made from? (1 point) Question 5: Reaction Rate (4 points) A. What does an energy diagram illustrate? Identify what the "hill" on the energy curve and the positions of the reactants and products represent. (1 point) B. Identify whether the following changes would generally increase or decrease the reaction rate. (3 points) Increasing the concentrations of reactants (0.5 point): Increasing the temperature (0.5 point): Increasing the pressure (0.5 point): Shining light on the reaction (0.5 point): Increasing the activation energy (0.5 point): Adding a catalyst (0.5 point): / Question 6: The Rate Law (4 points) A. According to the rate law (rate = k[A]m[B]n), what does the rate of a reaction depend on? (1 point) B. What happens as the reactants get used up in a reaction? (1 point) C. What relationship is described by the Arrhenius equation, ? (1 point) D. Identify whether the following changes would increase or decrease the rate constant. (1 point) • Increasing Ea (0.5 point):

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