Chemistry: Matter and Change

Chapter 15: Energy and Chemical Change

Chapter Test Practice

1
Before the water behind the dam is taken in through the water intake valve, what sort of useful energy does it possess?

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A)heat energy
B)kinetic energy
C)potential energy
D)mass energy
2
A 5 gram piece of aluminum foil at 100 degrees C is dropped into a 25 gram container of water at 20 degrees C. What is the final temperature of the aluminum?

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A)16.4 degrees C
B)23.6 degrees C
C)96.4 degrees C
D)103.6 degrees C
3
In the bomb calorimeter pictured, what is the function of the water?

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A)The water insulates the reaction.
B)The water prevents an explosion.
C)The water absorbs or provides energy.
D)The water provides hydrogen gas for ignition.
4
125 grams of water are placed in a foam cup. The initial temperature is 22.3 degrees Celsius. An 11.8 gram sample of metal is placed in the water at 108 degrees Celsius. The final temperature is 24.0 degrees Celsius. What is the specific heat of the metal, and what metal might the sample be?

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A)0.897, aluminum
B)1.825, beryllium
C)0.449, iron
D)1.023, magnesium
5
Spraying ethanol on your hand makes your hand feel cool. How much heat is absorbed in turning 3.00 grams of ethanol from a liquid to a vapor?

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A)115.8 kJ
B)1.19 kJ
C)0.321 kJ
D)2.51 kJ
6
A hydrogen balloon containing 0.250 moles of hydrogen gas explodes in the presence of oxygen such that all the hydrogen reacts. How much heat is released?

H2(g) + (1/2)O2(g) → H2O + 286 kJ
A)143 kJ
B)286 kJ
C)71.5 kJ
D)0.25 kJ
7
From the following data, H2 (g) + Cl2 (g) → 2HCl(g) ΔH°v = -185 kJ, 2H2 (g) + O2 (g) → 2H2O(g) ΔH° = -483.7 kJ, calculate ΔH° for the following reaction.

4HCl(g) + O2 (g) → 2Cl2 (g) + 2H2O(g)
A)299 kJ
B)-114 kJ
C)-299 kJ
D)114 kJ
8
Calculate ΔH° for the following reaction. The standard enthalpies of formation for the two reactants and two products are, in order, -1118, -110.5, -272, -393.5

Fe3O4(s) + CO(g) → 3FeO(s) + CO2(g)
A)-263 kJ
B)54 kJ
C)19 kJ
D)-50 kJ
9
Exothermic chemical reactions accompanied by an increase in entropy are all ________.
A)impossible
B)nonspontaneous
C)spontaneous
D)positive
10
For a particular process, ΔHsystem = -160 kJ and ΔSsystem = -400 J/K. Find ΔGsystem at 298 K. Is the process spontaneous?

ΔGsystem = ΔHsystem - TΔSsystem
A)-40.8 kJ, spontaneous
B)-40.8 kJ, nonspontaneous
C)40.8 kJ, spontaneous
D)40.8 kJ, nonspontaneous
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