Kinetics Worksheet. Version A
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- Mavis McKenzie
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1 1. Which event must always occur for a chemical reaction to take place? (A) formation of a precipitate (B) formation of a gas (C) effective collisions between reacting particles (D) addition of a catalyst to the reaction system 2. Increasing the temperature increases the rate of a reaction by (A) lowering the activation energy (B) increasing the activation energy (C) lowering the frequency of effective collisions between reacting molecules (D) increasing the frequency of effective collisions between reacting molecules 3. After being ignited in a Bunsen burner flame, a piece of magnesium ribbon burns brightly, giving off heat and light. In this situation, the Bunsen burner flame provides (A) ionization energy (C) heat of reaction (B) activation energy (D) heat of vaporization 4. The energy needed to start a chemical reaction is called (A) potential energy (C) activation energy (B) kinetic energy (D) ionization energy 5. As the number of effective collisions between reacting particles increases, the rate of reaction (A) decreases (C) remains the same (B) increases Kinetics Worksheet NAME 6. Base your answer to the following question on the table below, which represents the production of 50 milliliters of CO 2 in the reaction of HCl with NaHCO 3. Five trials were performed under different conditions as shown. (The same mass of NaHCO 3 was used in each trial.) Which two trials could be used to measure the effect of surface area? (A) trials A and B (C) trials A and D (B) trials A and C (D) trials B and D 7. Which conditions will increase the rate of a chemical reaction? (A) decreased temperature and decreased (B) decreased temperature and increased (C) increased temperature and decreased (D) increased temperature and increased
2 8. In each of the four beakers shown below, a 2.0-centimeter strip of magnesium ribbon reacts with 100 milliliters of HCl(aq) under the conditions shown. In which beaker will the reaction occur at the fastest rate? (A) A (B) B (C) C (D) D 9. Which statement explains why the speed of some 11. When a spark is applied to a mixture of hydrogen and chemical reactions is increased when the surface oxygen, the gases react explosively. Which potential area of the reactant is increased? energy diagram best represents the reaction? (A) This change increases the density of the reactant (A) particles. (B) This change increases the concentration of the reactant. (C) This change exposes more reactant particles to a possible collision. (D) This change alters the electrical conductivity of the reactant particles. 10. Adding a catalyst to a chemical reaction results in (A) a decrease in activation energy and a decrease in (B) the reaction rate (B) a decrease in activation energy and an increase (C) an increase in activation energy and a decrease (D) an increase in activation energy and an increase (C) (D)
3 12. The potential energy diagram of a chemical reaction is shown below. 14. The graph below represents the potential energy changes that occur in a chemical reaction. Which letter represents the activated complex? Which arrow represents the part of the reaction most likely to be affected by the addition of a catalyst? (A) A (C) C (B) B (D) D 13. A potential energy diagram is shown below. (A) A (C) C (B) B (D) D 15. Which potential energy diagram indicates a reaction can occur spontaneously? (A) (C) (B) (D) Which reaction would have the lowest activation energy? (A) the forward catalyzed reaction (B) the forward uncatalyzed reaction (C) the reverse catalyzed reaction (D) the reverse uncatalyzed reaction 16. When a reaction has a negative ΔG, it must be (A) exothermic (C) spontaneous (B) endothermic (D) non-spontaneous 17. Given the equation: ΔG = ΔH TΔS The ΔS represents a change in (A) entropy (C) enthalpy (B) free energy (D) temperature 18. In the free energy equation ΔG = ΔH TΔS, the symbol T refers to (A) time in seconds (B) time in hours (C) Celsius temperature (D) Kelvin temperature
4 19. Given the reaction: A(g) + B(g) AB(g) with ΔH ƒ º = 10 kilocalories per mole and ΔG ƒ º = +2 kilocalories per mole. This reaction is (A) exothermic and will occur spontaneously (B) exothermic and will not occur spontaneously (C) endothermic and will occur spontaneously (D) endothermic and will not occur spontaneously 20. Four aluminum samples are each reacted with separate 1 M copper sulfate solutions under the same conditions of temperature and pressure. Which aluminum sample would react most rapidly? (A) 1 gram bar of Al (C) 1 gram of Al pellets (B) 1 gram of Al ribbon (D) 1 gram of Al powder
5 Answer Key 1. C 2. D 3. B 4. C 5. B 6. A 7. D 8. D 9. C 10. B 11. B 12. B 13. A 14. B 15. D 16. C 17. A 18. D 19. B 20. D
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