Chem, 1411 Exam I Chapter 4&5 Spring 2014 Name: surroundings and gains 89 orms 1

Question

Chem, 1411 Exam I Chapter 4&5 Spring 2014 Name: surroundings and gains 89 orms 111 of work on its The value of AE for a system that perfo kJ of heat is -22 E) 22 A)-111 B) -200 C) 200 D) 2) Which one of the following is an endothermic process? Hydrochloric acid and barium A) ice melting B) freezing C) boiling soup D) hydroxide are mixed at 25 °C: the temperature increases. E) Both and C A) ice melting BO water evaporat g soup D) condensation of water vapor E)Ammonium thiocyanate and barium hydroxide are mixed at 25 C: the temperature drops. 4) Of the following, which one is a state function? none of the above A) H B) q C) w D) heat E) 5A sample of calcium carbonate (CaCO3 (s absorbs 45.5 J of heat, upon which the temperature of the sample increases from 21.1 °C to 28.5 °C. If the specific heat of calcium carbonate is 0.82 Jlg-K, what is the mass (in grams) of the sample? A) 3.7 B) 5.0 C) 7.5 410 5.0 x 103 6) The temperature of a 35.2 g sample of iron increases from 23.7 oC to 29.5 oC.If the specif heat of iron is 0.450 J/g-K, how many joules of heat are absorbed? increases from 21.1 °C to 39.0 °C. What is the specific heat ofiron? A) 0.140 B) 0.450 C) 0.820 D) 0.840 0.900 8) For which one of the following reactions is AH rkn equal to the heat of formation of th product? NO2 (g) A) N2 (g) 3H2 (g) PH4Br 6C (s) 6H (g) C6H6 D) P (g) 4H (g) Br (g) C6H2 2011 (g)

Explanation / Answer

Q1.

Apply First Law of thermodynamics

which states that for a closed system:

Q - W = dE

where, Q = heat , W = work, dE = energy of system

if

system performs 111 kJ then W = +111 kJ

if Q gains is 89 kJ then Q = +89 kJ

then

Q - W = dE

dE = +89 - 111

dE = -22 kJ

best answer is D

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