Answer Happy

1. Which of the following accurately describes the conditions of an isolated system? a. Both energy and matter can move into or out of the system. b. Only matter can move into or out of the system. c. Only energy can move into or out of the system. d. Neither energy nor matter can move into or out of the system. e. None of the above. 2. Which of the following accurately describes the conditions of an open system? a. Both energy and matter can move into or out of the system. b. Only matter can move into or out of the system. c. Only energy can move into or out of the system. d. Neither energy nor matter can move into or out of the system. e. None of the above. 3. Which of the following reactions is/are endothermic? Choose ALL that apply. a. C(s) + O₂(g) → CO₂(g) AH, = -394 kJ b. H₂(g) + Cl₂(g) → 2HCl(g) + 185 kJ c. 30₂(g) + 286 kJ 20,(g) 1 d. N₂(g) + 20₂(g) → 2NO₂(g) AH = +33.2 kJ e. - H₂O(s) + heat H₂O(1) f. 238 U "He + 234Th + heat 4. If the heat of formation of carbon dioxide is -393 kJ/mol, then the heat of reaction for the breakdown of 1.25 mol of carbon dioxide is approximately a. -491 kJ d. +314 kJ b. -393 kJ e. +393 kJ 6. - 314 KJ f. +491 kJ 5. A 6.00-g candle is consumed in heating 45.0 g of water from 19.0°C to 32.0°C. If you ignore loss of heat to the air, the energy produced per gram of candle would be approximately a. 183 J d. 732 J b. 408 J e. 2450 J C. 512 J f. None of the above

6. What are the TWO most appropriate methods to quantify the rate of reaction in the following chemical system? Choose two. CH₂(g) +20,(g) → 2H₂O(g) + CO(g) 1 a. Change in colour b. Change in conductivity d. Change in pressure e. Change in temperature f. None of the above c. Change in mass 7. In the following chemical reaction the rate of consumption of liquid propane is observed to be 2.0 mol/(L-min): C₂H (1) +50₂(g) → 3CO(g) + 4H₂O(g). What is the rate of production of carbon dioxide? d. 10 mol/(L-min) e. 12 mol/(L-min) f. 14 mol/(L-min) a. 4 mol/(L-min) b. 6 mol/(L-min) c. 8 mol/(L-min) 8. It, for the reaction ax + by-products, the rate law is determined to be r= K[XPEYP, then the overall order of reaction is a. 1 d. 4 b. 2 e. 5 c. 3 f. 6 9. Refer to the reaction below. How much heat is released if 171.0 g of Potassium metal reacts? 2K(s) + 2H₂O(1)→ H₂(g) + 2KOH(aq) + 393 kJ. a. 393 kJ d. 1180 kJ e. 1723 KJ b. 590 kJ C. 862 K f. None of the above Corrected True/False: Indicate whether each statement is true or false by circling the word true or the word false. If false, correct the statement to make it true in the space provided. (4 marks total; 1 mark each) 10. A nuclear change involves a greater enthalpy change than does a chemical change. True/False 11. In exothermic reactions the products have more kinetic energy than the reactants. True / False 12. The process of nuclear decay is a first order reaction. True/False 13. The rate-determining step is the fastest step in a reaction mechanism. True / False