Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 7 Homework
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Question #1
Heat, work, and energy all have the same units.
A.
TRUE
B.
FALSE
Question #2
A 1.265 kilocalorie when expressed in joules is 5293 J.
A.
FALSE
B.
TRUE
Question #3
Heat always flows from a body with higher temperature to a body with lower temperature.
A.
TRUE
B.
FALSE
Question #4
The quantity of heat is transferred when a 565 g block of aluminum metal is cooled from 243°C to 100°C is 17400 cal. The specific heat capacity of aluminum is 0.900 J/g oC.
A.
FALSE
B.
TRUE
Question #5
The increase of the temperature of a substance weighing 1000 g when 1000 cal of energy is transferred to it is an example of an isothermal process.
A.
TRUE
B.
FALSE
Question #6
Nutritional energies are usually expressed as _____.
A.
kJ
B.
Cal
C.
joule
D.
watt
E.
cal
Question #7
The energy content of a bar of chocolate is 120.0 Cal. What is the energy content in kJ?
A.
502,100
B.
120
C.
502.1
D.
28.68
E.
120,000
Question #8
A specimen weighing 100.0 g is heated from 30.00°C to 63.30°C. If the quantity of heat transferred is 5834 cal, determine the specific heat of the specimen.
A.
17.25 cal/ g·°C
B.
1.572 cal/ g·°C
C.
1.752 cal/ g·°C
D.
1.257 cal/ g·°C
E.
12.75 cal/ g·°C
Question #9
What quantity of heat is transferred when a 250.0 g block of aluminum is heated from 25.00°C to 73.30°C? (Hint: The specific heat of aluminum = 0.2150 cal/g·°C.)
A.
56160 cal
B.
2596 cal
C.
1.110 cal
D.
8986 cal
E.
1298 cal
Question #10
At what temperature can water exist as both a liquid and a gas?
A.
–4°C
B.
4°C
C.
100°C
D.
0°C
E.
10°C
Question #11
How much energy is needed to melt 87.6 g of Au at its melting point of 1,064°C? (Hint: The heat of fusion of Au = 15.3 cal/g.)
A.
14400 cal
B.
670 kcal
C.
12.1kJ
D.
2.80 kJ
E.
1340 cal
Question #12
What is the heat of fusion of iron in calories per mole?
A.
4.53 × 100 cal/mol
B.
4.53 × 102 kcal/mol
C.
5.34 × 104 cal/mol
D.
4.35 × 103 kcal/mol
E.
3.54 × 103 cal/mol
Question #13
What is the process by which a substance forms vapor directly from the liquid state?
A.
Melting
B.
Sublimation
C.
Vaporization
D.
Condensation
E.
Fusion
Question #14
Which of the following statements is true for the bonding of atoms?
A.
Individual atoms have higher amounts of energy than when in a compound.
B.
The energy of a compound is equal to the energies of the atoms which make up the compound.
C.
When a compound disintegrates there is a release of energy which equals the difference in energy between individual atoms.
D.
The formation of a compound naturally, from individual atoms, requires external energy.
E.
The energy of the individual atoms is lower than the energy of the compound.
Question #15
A serving of Chicken A La King has 235 kcal. If the serving has 11 g of carbohydrates and 12 g of fat, about how many grams of protein are in the serving?
A.
7.0 g
B.
13 g
C.
27 g
D.
21 g
E.
11 g
Question #16
The reaction between sodium metal and H2O gives off heat. This type of reaction is called an _____ reaction.
A.
exothermic
B.
energy requiring
C.
endothermic
D.
energy-less
E.
isothermal
Question #17
The reaction with which dietary component gives off the most energy?
A.
fiber
B.
carbohydrates
C.
sugar
D.
protein
E.
fats
Question #18
4 Cal is equal to _______ joules.
A.
16736
B.
176736
C.
16376
D.
17663
Question #19
The phase change wherein a solid goes directly to a gas is called _______.
A.
evaporation fusion
B.
melting
C.
sublimation
Question #20
The temperature change when 4460 cal of heat is used to melt 55.8 grams of ice is _______.
A.
4
B.
3
C.
0
D.
6
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