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.
FALSE
B.
TRUE
Question #2
A 1.265 kilocalorie when expressed in joules is 5293 J.
A.
TRUE
B.
FALSE
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.
TRUE
B.
FALSE
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.
cal
B.
joule
C.
watt
D.
kJ
E.
Cal
Question #7
The energy content of a bar of chocolate is 120.0 Cal. What is the energy content in kJ?
A.
120
B.
502.1
C.
502,100
D.
120,000
E.
28.68
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.
1.257 cal/ g·°C
C.
1.752 cal/ g·°C
D.
1.572 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.
1298 cal
C.
2596 cal
D.
1.110 cal
E.
8986 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.
12.1kJ
B.
670 kcal
C.
2.80 kJ
D.
1340 cal
E.
14400 cal
Question #12
What is the heat of fusion of iron in calories per mole?
A.
5.34 × 104 cal/mol
B.
4.35 × 103 kcal/mol
C.
3.54 × 103 cal/mol
D.
4.53 × 100 cal/mol
E.
4.53 × 102 kcal/mol
Question #13
What is the process by which a substance forms vapor directly from the liquid state?
A.
Fusion
B.
Vaporization
C.
Sublimation
D.
Condensation
E.
Melting
Question #14
Which of the following statements is true for the bonding of atoms?
A.
The energy of the individual atoms is lower than the energy of the compound.
B.
The energy of a compound is equal to the energies of the atoms which make up the compound.
C.
Individual atoms have higher amounts of energy than when in a compound.
D.
The formation of a compound naturally, from individual atoms, requires external energy.
E.
When a compound disintegrates there is a release of energy which equals the difference in energy between individual atoms.
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.
11 g
B.
7.0 g
C.
21 g
D.
27 g
E.
13 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.
isothermal
E.
energy-less
Question #17
The reaction with which dietary component gives off the most energy?
A.
sugar
B.
protein
C.
carbohydrates
D.
fiber
E.
fats
Question #18
4 Cal is equal to _______ joules.
A.
176736
B.
17663
C.
16736
D.
16376
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.
0
C.
3
D.
6
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