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AP Chemistry Practice Test, Ch. 6: ThermochemistryNameMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) A chemical reaction that absorbs heat from the surroundings is said to be and has a DHat constant pressure.A) endothermic, positiveB) endothermic, negativeC) exothermic, negativeD) exothermic, positiveE) exothermic, neutral2) The reaction4Al (s) 3O2 (g) 2Al2O3 (s)DHe -3351 kJis , and therefore heat is by the reaction.A) exothermic, releasedB) exothermic, absorbedC) endothermic, releasedD) endothermic, absorbedE) thermoneutral, neither released nor absorbed3) The value of DHe for the reaction below is -126 kJ. How much heat (in kJ) is released when 2.00 mol of NaOHis formed in the reaction?2Na2O2 (s) 2H2O (l) 4NaOH (s) O2 (g)A) 252B) -126C) 7.8D) 63E) 3.94) The value of DHe for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g ofS is kJ.2S (s) 3O2 (g) 2SO3 (g)A) -23B) 12C) -12D) 23E) -7905) The value of DHe for the reaction below is -6535 kJ. How many kJ of heat are released in the combustion of 16.0g of C6H6 (l)?2C6H6 (l) 15O2 (g) 12CO2 (g) 6H2O (l)A) 673B) 2.68 x 103C) 5.23 x 1041D) -6535E) 1.34 x 103
6) The value of DHe for the reaction below is -336 kJ. Calculate the heat (kJ) released to the surroundings when23.0 g of HCl is formed.CH4 (g) 3Cl2 (g) CHCl3 (l) 3HCl (g)A) 211B) 177C) 70.7D) -336E) 2.57 x 1037) The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of15 g of lead from 22eC to 37eC?A) 29B) 5.8 x 10-4C) -0.13D) 2.0E) 0.138) The specific heat of liquid bromine is 0.226 J/g-K. How much heat (J) is required to raise the temperature of10.0 mL of bromine from 25.00e C to 27.30e C? The density of liquid bromine: 3.12 g/mL.A) 16.2B) 10.4C) 32.4D) 5.20E) 3009) The specific heat capacity of methane gas is 2.20 J/g-K. How many joules of heat are needed to raise thetemperature of 5.00 g of methane from 36.0eC to 75.0eC?A) 22.9B) 88.6C) 429D) 0.0113E) 122110) The DH for the solution process when solid sodium hydroxide dissolves in water is -44.4 kJ/mol. When a13.9-g sample of NaOH dissolves in 250.0 g of water in a coffee-cup calorimeter, the temperature increasesfrom 23.0eC to eC. Assume that the solution has the same specific heat as liquid water, i.e., 4.18 J/g-K.A) 14.0e CB) 37.8e CC) 40.2e CD) 37.0e CE) 35.2e C11) Given the following reactionsFe2O3 (s) 3CO (s) 2Fe (s) 3CO2 (g) H -28.0 kJ3Fe (s) 4CO2 (s) 4CO (g) Fe3O4 (s) H 12.5 kJthe enthalpy of the reaction of Fe2O3 with CO3Fe2O3 (s) CO (g) CO2 (g) 2Fe3O4 (s)is kJ.A) 40.5B) 109C) -15.52D) -109E) -59.0
12) Given the following reactionsN2 (g) 2O2 (g) 2NO2 (g)DH 66.4 kJ2NO (g) O2 (g) 2NO2 (g)DH -114.2 kJthe enthalpy of the reaction of the nitrogen to produce nitric oxideN2 (g) O2 (g) 2NO (g)is kJ.A) -47.8B) 47.8C) 180.6D) -180.6E) 90.313) Calculate DHe (in kJ) for reaction 3.2S (s) 3O2 (g) 2SO3 (g)S (s) O2 (g) SO2 (g) H -790 kJ H -297 kJthe enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide2SO2 (g) O2 (g) 2SO3 (g)is kJ.A) -196B) -543C) 1087D) 196E) -1384D) -16.43E) -32.86D) -76.4E) -744.914) The value of DHe for the following reaction is -3351 kJ:2Al (s) 3O2 (g) 2Al2O3 (s)The value of DHfe for Al2O3 (s) is kJ.A) -3351B) -1676C) 335115) Given the data in the table below, DHe rxn for the reactionCa(OH)2 2H3AsO4 Ca(H2AsO4)2 2H2Ois kJ.SubstanceCa(OH)2H3AsO4Ca(H2AsO4)2H2OA) -4219DHfe (kJ/mol)-986.6-900.4-2346.0-285.9B) -130.4C) -45193
16) Given the data in the table below, DHe rxn for the reactionIF7 (g) I2 (g) IF5 (g) 2IF (g)is kJ.SubstanceDHfe (kJ/mol)IF (g)IF5 (g)-95-840IF7 (g)-941A) 311 kJB) 69 kJC) -1991 kJD) -69 kJE) The DHfe of I2 (g) is needed for the calculation.4
Answer KeyTestname: CH 06 PRAC TEST.TSTMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) AID: chem9b 5.1-322) AID: chem9b 5.1-333) DID: chem9b 5.1-354) CID: chem9b 5.1-375) AID: chem9b 5.1-386) CID: chem9b 5.1-407) AID: chem9b 5.1-548) AID: chem9b 5.1-579) CID: chem9b 5.2-510) DID: chem9b 5.1-5811) EID: chem9b 5.1-6312) CID: chem9b 5.1-6413) AID: chem9b 5.1-6614) BID: chem9b 5.1-7415) BID: chem9b 5.1-8116) EID: chem9b 5.1-831
AP Chemistry Practice Test, Ch. 6: Thermochemistry Name_ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. . Testname: CH_06_PRAC_TEST.TST MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A ID: chem9b 5.1-32 2) A ID: chem9b 5.1-33 .
