Thermochemistry Review

MUL ТIPLE СНОIСЕ. Choose tJe one altemative that best completes the statement or answers the q • . uestion. 1 1) How many joules are there i.n а 255 calorie snack bar? А) 1.07 • 106 В) 1.07 • 103 С) 6.09 • 104 D} 2.55 • loS Е) none of the abovJ 2) How many calories are there i.n а 255 Calorie snack bar? А) 2.55 х 105 В) I • 103 С)бО.9 D) 1.07 х 1оЗ Е) none of the abovi, � 3) What is the specific he t Ufg,° C) of а metal oЬject whose temperature increases Ьу 3.0°С when 17.5 g of metal was hea ted with 38.5 J? А)О.73 В) 0.15 Q4.18 Е) none of the abov!" D)1.4 ;J 4) How much heat (kJ} needed to raise the temperature of 100.0 grams of water from 25.0°С to 50.0°С? А) 10.5 В) 10450 С) 0.598 D) 1.05 Е) none of the аbove 5) From the following lisl of substances and heat capacities, choose the one that wШ_have the lowest temperature after absorblng 100.0 kJ of heat. Assume identical masses of each substance start at the same initial temperature. J А) copper-0.385 JJ . 0С В) water-4.18 J/g,{ С) lead-0.128 J/g,°C D) ethanol-2.42 J/gj°C E)notenoughinformation 1 6) А 15.0 gram lead ball at :z:j.o•c was heated with·40.5 joules of heat. Given the specific heat of lead is 0.128 J/g•"C, what is the Щ,аl temperature of the lead? А) 21.1 °С В) 46.1 °С ° С) О.844 С DJ 77.8°С Е) none of the above / 7) Consider the following sJecific heats of metals. Metal Alumiлum Copper Gold Iron Silver Spedfic Heat {Ug- °C) 0.903 0.385 0.128 0.449 0.235 If the same amount of hert is added to 50.0 g samples of each of the metals, which are all at the same temperature, whicl\ metal wiJJ reach the highest temperature? А) silver С) gold О) copper Е) iron i) alumiлum 8) Suppose it took 108 joules of energy to raise а bar of gold from 25.0 °С to 29.7°С. Given that the specific heat capacity of koid is 0.128 J/g•° C, what is the mass (in grams) of the bar of gold? А) 1.28 х 102 g В) 6.5 х 101 g С) 1.08 х 102 g О) 1.8 х lo2 g Е) none of the above 1 9) What is the final tempetature of 25.0 grams of water at 22.0 °С after it absorbs 454) of heat? А) 15.8 В) 4.29 С)26.3 О) 17.7 Е) none of the above! 10) How many grams of w�ter when supplied with348 J of heat will gain а temperature of 5.2 °С? А)lб В) 15 С)17 О) 19 Е) none of the а bove AnswerKey Testname: ТНЕRМОСН I ISТRY 1) В 2) А З)А 4)А 5) В 6) В 7)С B)D 9 )С 10) А MUL ТIPLE CHOICE. Choose фе one altemative tha.t best completes the statement or answers the question. 1) For а system at constant pressure, 12,400 calories ofheat are released. 'Irus quantity of heat is equivalent to А) 1.92 • 10-5 J. q 2.96 • 1()3 J. О) 5.19 • 104 J. В) 1.24 • 104 J. 2) Jt takes 11.2 kJ of energy to raise the temperature of 145 g of beлzene from 25.0°С to 70.0°С. What is the specific heat of Ьелzеле? D) 3.48 J/(g • 0С) С) 5.41 J/(g • 0С) А) 1.72 J/(g. 0 С) В) 1.10 J/(g. 0С) 3) The specific heat of.copper is 0.385 J/(g. 0С). If 34.2 g of copper, i.nitia1ly at 25 °С, absorbs 4.689 kj, what will Ье the final temperature of the copper? С) 356 ° С О) 27.8°С А) 25.4°С В) 381 °С 4) Jt takes 11.2 kJ of ener:gy to raise the temperature of 145 g of Ьелzеле from 23.0°С to 68.0°С. What is the specific heat of betlzene? В) 5.25 J/(g • 0С) А) 1.14J/(g • 0С) О) 1.72 J/(g. 0С) С)3.48 J/(g. 0С) i 5) The specific heat of co,Pper is 0.385 J/(g • 0С). If 34.2 g of copper, initmlly at 24.0°С, absorbs 4.689 kJ, what wi11 Ье the final temperature of the сорре�? А) 356 °С С) 26.8°С О) 380 °С В) 24.4°С 6) For а process at const equivaleлt to А) 1.19 • 104 J. t pressure, 49,600 caJories of heat are released. 'Irus quaлtity of heat is В) 4.82 к 10-6 J. С) 1.24 к 104 J. D) 2.08 к 105 J. 7) How much heat is аЬ orbed/released wheл 35.00 g of NНз(g) reacts in the presence of excess 0:2(g) to produce NO(g) an H2O(I) according to the following chemical equation? I 1NНз(g)+50:2(g)-+ 4 NO(g) + 6 H2O(I) ЛН0 = 1168 kJ В) 600.1 kJ of heat are released. А) 2400 kJ of heat are absorЬed. С) 2400 kJ of heat e released. D) 600.1 kJ of heat are absorbed. t 8) How much heat i.s absorbed when 45.00 g of C(s) reacts in the presence of excess S0:2(g) to produce 1 CS2(/) and CO(g) acc rding to the following chemical equation? 5 C(s) + 2 S0:2(g)-+ CS2(/) + 4 CO(g) ЛН0 = 239.9 kJ 1 А) 898.5 kJ В) 239.9 kJ q 179.8 kj D) 2158 kj 9) At coлstant pressure, ,the combustion of 15.0 .8 of С2Нб(g) releases 777 kJ of heat. What is ЛН for the reaction given bel�w? 1 2 С2Нб(g) + 7 02(g)-+ 4 C02(g) + 6 Н2О(/) В) -779 kJ А)-1560 kJ С) -3120 kj D) -129 kJ AnswerKey Testname: 1027 lliERМO НЕМISТRУ REVIEW 1)0 2) А 3) В 4)0 5)0 6)0 7) О S)C 9)С MULТIPLE CHOICE. Оюоsе the one.altemative that best completes the statement or answers the question. 1) Which type of energy is associated with motion?, А) _kinetic В) potential j С) electrical D) chemical Е) none of the аЬо е 2) Which type of energy ,is associated with position? А) electrical В) kinetic С) potential D) chemica l Е) none of the above З) What type of energy is associated with the bumiлg of gasoline? А) potential В) chemical j С) kinetic D) electrical Е) none of the аЬо ,е 4) How many calories а1е there in а 255 Calorie snack bar? А) 2.55 х 105 В) 1.07 х lОЗ С) 1 х 103 0)60.9 Е) none of the above 1 5) How many joules are there in а 255 calorie snack bar? · А) 6.09 х 104 В) 1.07 х 1об С) 2.55 х loS 1 i D) 1.07 х 10З Е) none of the аЬо�е 6) From the following lil of substances and heat capacities, cl1oose the one that will have the lowest temperature after absorblng 100.0 kJ of heat. Assume identical masses of each suЬstance start at the same initial temperat(lre. А) ethanol-2.42 J/g;0c В) water-4. 18 J/g, °C С) copper-0.385 f/g.°C D) lead-0.128 J/g•0f gold is 0.128 J/g, °C, what is tЬе mass (in grams) of the bar of gold? А) 1.8 х 1о2 g В) 6.5 х 101 g С) 1.28 х 102 g . . D) 1.08 х 102 g . Е) none of tЬе аЬо1 е 14) How many grams of Later wh.en supplied with 348 J of heat will gain а temperature of 5.2 °С? А) 16 i В) 15 С)19 D) 17 Е) none of tЬе аЬо�е � 15) Given tЬе tаЫе of s cific heat values below, what is the identity of а 10.0 g metal sample that ° increases Ьу 14.0 С when 62.9 J of energy is absorЬed? 1 Specific HeatП/g°C) Element 0.128 Au 0.235 Ag : 0.385 Cu 0.449 Fe 0.903 А! A)Au B)Fe C)AI D)Ag Е) none of the above 16) Given tЬе tаЫе of spbfic heat values below, what is the identity of а 26.2 g metal sample that increases Ьу 8.5 ° C w en 100.0 J of energy is absorbed? _ 1 . Element Au Ag Cu Fe А! Specific HeatП/g"C) 0.128 1 0.235 , 0.385 0.449 0.903 A)AI В) Au C)Fe D)Ag Е) none of the above AnswerKey Testname: UNТIТLEDl 1) А 2)С 3) В 4) А 5)0 6) В 7) D B)D 9) В 10) В 11) В 12) А 13)А 14)А 15) В 16) С