Name SUNY Chemistry Practice Test: Chapter 5

Transcription

1 Name SUNY Chemistry Practice Test: Chapter 5 Multiple Choice

2 1) Calculate the kinetic energy in joules of an automobile weighing 135 lb and traveling at 55 mph. (1 mile = km, 1 lb = g) 4 A) B) C) D) E) ) The change in the internal energy of a system that absorbs,500 J of heat and that does 7,655 J of work on the surroundings is J. A) 10,155 B) 5,155 C) -5,155 D) -10,155 7 E) ) The value of ΔH for the reaction below is -16 kj. The amount of heat that is released by the reaction of 5.0 g of NaO with water A) 0. B) 40.4 C) 67.5 D) 80.8 E) -16 Na O (s) + H O (l) 4NaOH (s) + O (g) 4) The value of ΔH for the reaction below is -336 kj. Calculate the heat (kj) released to the surroundings when 3.0 g of HCl is formed. A) B) C) 70.7 D) 11 E) -336 CH (g) + 3Cl (g) 4 3 CHCl (l) + 3HCl (g)

3 5) The value of ΔH for the reaction below is kj: CH OH (l) CO (g) + H (g) 3 How many kj of heat are consumed when 15.5 g of CH3OH (l) decomposes as shown in the equation? A) 0.48 B) 6.0 C) 1.3 D) 3 E) ) The molar heat capacity of a compound with the formula CHSO 6 is 88.0 J/mol-K. The specific heat of this substance is J/g-K. A) 88.0 B) 1.13 C) D) E) ) A sample of aluminum metal absorbs 9.86 J of heat, upon which the temperature of the sample increases from 3. C to 30.5 C. Since the specific heat capacity of aluminum is 0.90 J/g-K, the mass of the sample is g. A) 7 B) 1.5 C) 65 D) 8.1 E) 6.6 8) Given the following reactions FeO 3 (s) + 3CO (s) Fe (s) + 3CO (g) Δ H = -8.0 kj 3Fe (s) + 4CO (s) 4CO (g) + Fe3O 4 (s) Δ H = +1.5 kj the enthalpy of the reaction of FeO 3 with CO A) B) 40.5 C) D) -109 E) Fe O (s) + CO (g) CO (g) + Fe O (s)

4 9) Given the following reactions (1) NO N + O Δ H = -180 kj () NO + O NO Δ H = -11 kj the enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide N + O A) 68 B) -68 C) -9 D) 9 E) -146 NO 10) Ammonia, NH 3, is burned in the manufacture of nitric acid to produce NO. Benzene, C 6 H 6 is burned in high-octane engines. 4 NH (g) + 7 O (g) 4 NO (g) + 6 H O (l) Determine the ΔH for the combustion of ammonia using Hess s law and the heat of reaction data: ½ N (g) + 3/ H (g) NH 3 (g) ½ N (g) + O (g) NO (g) ½ O (g) + H (g) H O (l) ΔH = - 46 kj/mol ΔH = + 34 kj/mol ΔH = - 86 kj/mol 11) The value of ΔH for the reaction below is -186 kj. H (g) + Cl (g) HCl (g) o f The value of ΔH for HCl (g) is kj/mol. A) B) C) D) -186 E)

5 1) The value of ΔH for the following reaction is kj: The value of A) B) C) D) E) Al (s) + 3O (g) Al O (s) 3 o ΔH f for AlO 3 (s) 13) The internal energy of a system is always increased by. A) adding heat to the system B) having the system do work on the surroundings C) withdrawing heat from the system D) adding heat to the system and having the system do work on the surroundings E) a volume compression 14) Of the following, which one is a state function? A) H B) q C) w D) heat E) none of the above 15) Which of the following is a statement of the first law of thermodynamics? 1 A) E k = mv B) A negative ΔH corresponds to an exothermic process. C) Δ E = E final - Einitial D) Energy lost by the system must be gained by the surroundings. E) 1 cal = J (exactly) 16) The reaction 4Al (s) + 3O (g) Al O 3 (s) ΔH = kj is, and therefore heat is by the reaction. A) endothermic, released B) endothermic, absorbed C) exothermic, released D) exothermic, absorbed E) thermoneutral, neither released nor absorbed 5

6 17) The units of of specific heat are. A) K/J or C/J B) J/K or J/ C C) J/g-K or J/g- C D) J/mol E) g-k/j or g- C/J 18) The combustion of titanium with oxygen produces titanium dioxide: Ti (s) + O (g) TiO (s) When 0.71 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 5.00 C to C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kj/k. The heat of reaction for the combustion of a mole of Ti in this calorimeter is kj/mol. A).67 B) 4.98 C) -311 D) E) ) A 50.0-g sample of liquid water at 5.0 C is mixed with 9.0 g of water at 45.0 C. The final temperature of the water is C. The specific heat capacity of liquid water is 4.18 J/g-K. A) 10 B) 7.6 C) 35.0 D) 14 E) 3.3 0) Given the data in the table below, Δ H rxn for the reaction Ca(OH) + H AsO Ca(H AsO ) + H O Substance ΔH f (kj/mol) Ca(OH) H 3 AsO Ca(H AsO 4 ) H O A) B) C) -419 D) E)

7 1) Given the data in the table below, ΔH for the reaction CO (g) + O (g) CO (g) Substance ΔH f (kj/mol) CO (g) CO CaCO 3 (s) A) B) C) 83.3 D) E) The ΔH f of O (g) is needed for the calculation. ) Given the data in the table below, Δ H rxn for the reaction Ag S (s) + O (g) Ag O (s) + S (s) Substance ΔH f (kj/mol) Ag O (s) Ag S (s) -3.6 H S (g) -0.6 H O (l) -86 A) -1.6 B) +1.6 C) -3. D) +3. E) The ΔH f of S (s) and of O (g) are needed for the calculation. 3) Given the equation HO (l) HO (g) Hrxn = 40.7 kj at 100oC Calculate the mass of liquid water (in grams) at 100oC that can converted to vapor by absorbing.400 kj of heat. 7

8 4) The density of air under ordinary conditions at 5 C is 1.19 g/l. How many kilograms of air is in a 3 3 room that measures 11.0 ft 11.0 ft and has an 10.0 ft ceiling? 1 in. =.54 cm. (exactly); 1 L = 10 cm A) 3.66 B) C) D) E)

9 ANSWERS 1. Answer: B Diff: Page Ref: Sec Answer: C Diff: 3 Page Ref: Sec Answer: A Diff: 3 Page Ref: Sec Answer: C Diff: Page Ref: Sec Answer: B Diff: Page Ref: Sec Answer: B Diff: 3 Page Ref: Sec Answer: B Diff: 3 Page Ref: Sec Answer: A Diff: 3 Page Ref: Sec Answer: A Diff: 3 Page Ref: Sec ΔH = kj 11. Answer: C Diff: Page Ref: Sec Answer: B Diff: Page Ref: Sec Answer: A Diff: Page Ref: Sec Answer: A Diff: Page Ref: Sec Answer: D Diff: 3 Page Ref: Sec Answer: C Diff: 1 Page Ref: Sec Answer: C Diff: Page Ref: Sec Answer: E Diff: 4 Page Ref: Sec Answer: E Diff: 3 Page Ref: Sec Answer: D Diff: 3 Page Ref: Sec Answer: A Diff: 3 Page Ref: Sec Answer: D Diff: 3 Page Ref: Sec Answer: 1.06 grams Diff: 3 Page Ref: Sec Answer: E Diff: 3 Page Ref:Sec