UNIT 3 TEST MADINA SCH4U 2023- sst-2

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University of Toronto *

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Chemistry

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Oct 30, 2023

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THERMOCHEMISTRY SCH4U Page 1 of 8 Student’s Name : Date: TEST #03 Knowledge / Understanding Thinking/Inquiry Communication Application Marks 15 15 15 15 60 Part A: Multiple choice (Knowledge/ Understanding 15x1=15) F or each question select the best answer from the four alternatives. -------- 1. What is the correct order from highest to lowest molar heat value for the three types of energy a. chemical, phase, nuclear b. phase, chemical, nuclear c. nuclear, phase, chemical d. nuclear, chemical, phase --------- 2. Which statement about enthalpy is true? a. heat is given off to the surroundings in endothermic reactions b. some substances have a negative specific heat capacity c. specific heat capacity is the same for all liquids d. the sign of ∆H is always negative in exothermic reactions -------- 3. Which is an exothermic process? a. ice melting b. water boiling c. water evapo rating d. water vapour condensing -------- 4. The total amount of potential energy and kinetic energy of a substance is called a. energy of motion b. conservation of energy c. energy composition d. thermal energy ---------- 5. The rate of reaction depends up on a. the concentration and nature of reaction b. the temperature of the reaction

THERMOCHEMISTRY SCH4U Page 2 of 8 c. whether or not a catalyst was used d. all of the above -------6. Which of the following would react most rapidly? a. powered Zn in 1.M HCl at 40 0 C b. powdered Zn in 2.M HCl at 40 0 C c. A lump pf Zn in 2 M HCl at 25 0 C d. A lump of Zn in 1 M HCl at 40 0 C --------7. In a reaction mechanism the rate determining step is always a. the reaction intermediate b. the last step c. the slowest step d. the fastest step ------- 8. When a lit match is touched to the wick of a candle, the candle begins to burn. When the match is removed, the candle continues to burn. In this reaction the match a. behaves as a catalyst b. supplies activation energy c. is part of the rate determining step d. lowers the activation energy barrier ---------9. A chemical system in which both energy and matter can flow in to or out of a system is called as a. open system b. closed system c. isolated system d. a chemical system -------- 10. The catalyzed pathway of a reaction mechanism has ------------ activation energy and thus causes a ----------- reaction rate. a. higher, lower b. higher, higher c. lower, higher d. lower, lower ------- 11. The development of which one of the following energy has the least negative impact on the environment a. solar b. coal c. biomass d. natural gas -------- 12. You are using a bomb calorimeter that is calibrated at 7.8 Kj/ 0 C to measure the energy content of food in Kj/g. Select the piece of information not required to complete the calculation for energy content.

THERMOCHEMISTRY SCH4U Page 3 of 8 a. initial temperature b. heat capacity of the calorimeter c. mass of water in the calorimeter d. mass of food --------13. You have a sample of oxygen gas at SATP. To increase the total thermal energy you could a. decrease the temperature of the sample at constant pressure b. increase the pressure on the sample at constant temperature c. insulate the sample from the surroundings d. increase the mass of the sample. -------14. Which one of the following features of a chemical reaction is the best indicator as to whether the reaction will proceed quickly at room temperature ? a. reaction mechanism b. activation energy c. balanced equation d. rate law equation ------- 15. Which of the following most closely applies to collision theory? a. kinetic molecular theory b. the first law of thermodynamics c. Boyle’s law d. atomic theory PART B. ( THINKING/ INQUIRY: 15) 1. Indicate whether each statement is true or false. If you think the statement is false, rewrite it to make it true. ( T/I= 5) i. The law of conservation of energy states that the energy of a system is always zero. ii. More energy is released when a double bond forms than when a triple bond forms iii. Not all conventional fuels are non- renewable. iv. The concentration of the product or reactant in a reaction changes over time.

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THERMOCHEMISTRY SCH4U Page 4 of 8 v. A reaction intermediate may be used in the rate law if required. 2 . Identify the type of molar enthalpy for each reaction below. ( I=3) i. MgCl 2 (s) ----  Mg 2+ + 2 Cl — (aq) ii. CH 3 COOH(aq) + NaOH ( aq) ---  CH 3 COONa(aq) + H 2 O (l) . iii. H 2 O (l) ---  H 2 O (s) . 3. Which of the factors that affect rate of reaction do so by (I=2) i. increasing the collision frequency ii. increasing the fraction of collision that are effective. 4. What is the difference between an elementary step and a rate determining step? (I=3) 5. Identify each of the following as Physical, chemical or nuclear change.( I=2)

THERMOCHEMISTRY SCH4U Page 5 of 8 i. Zinc metal added to an acid solution ii. Ice applied to an injury. PART C: COMMUNICATION (15) 1. Explain any three Factors on which rate of a reaction depends on. Explain.( Comm 4) 2. . Distinguish between nuclear fission and nuclear fusion reactions. ( 4)

THERMOCHEMISTRY SCH4U Page 6 of 8 3. Identify each of the following as an exothermic or endothermic reaction. ( Comm 4) i. hydrogen undergoes nuclear fusion in the sun to produce helium. ii. the butane in a lighter burns iii. water freezes iv. water evaporates 4. Explain how ∆ H system and q surroundings are different and how they are similar? ( Comm 3) PART D ( APPLICATION : 15) 1.What would be the final temperature be if 250 J of heat were transferred into 10g of methanol initially at 20 0 C.( Sp.heat capacity of methanol = 2.918J/g 0 C).( App 3)

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THERMOCHEMISTRY SCH4U Page 7 of 8 2. What amount of ethyleneglycol would vaporize while absorbing 200Kj of heat. (∆Hvap. = 58.8 Kj/mol) ( App 2) 3. Calculate the ΔH for the production of ethane using Hess’s law.(App 6) C 2 H 6 (g) --  C 2 H 4 (g) + H 2 (g) The following are the thermochemical equations. i. C 2 H 6 (g) + 3.5 O 2 (g) --  2 CO 2 (g) + 3 H 2 O (l) ΔH= -- 1559 Kj ii. C 2 H 4 (g) + 3 O 2 (g) --  2CO 2 (g) + 2 H 2 O(l) ΔH = --- 1411KJ iii. 2 H 2 (g) + O 2 (g) ---  2 H 2 O(l) ΔH = -- 572 kj

THERMOCHEMISTRY SCH4U Page 8 of 8 4. i) What is the overall rate of production of nitrogen dioxide in the system 2N 2(g) + O 2(g) ----  2NO 2 (g) If the concentration of nitrogen dioxide changes from 0.32 mol/L to 0.80 mol/ L in 3 min ? ( App 2) ii) What is the average rate of production of ammonia for the system between 1.0 and 4.0 min. N 2 + H 2-  NH 3 (g) If the concentration of ammonia is 3.5 mol/L after 1 min and 6.2 mol/L after 4 min? ( App2)

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