quantity of heat needed to raise the temperature of 1 g of water by 1�C
b calorie
SI unit of energyc
c Joule
quantity of heat needed to change the temperature of 1 g of a substance by 1�Cf
e Specific Heat
quantity of heat needed to change the temperature of an object by 1�C
f Heat Capacity
device used to measure the heat absorbed or released during a chemical or physical process
a Calorimeter
heat content of a system at constant pressure
d enthalpy
the enthalpy change for a chemical reaction exactly as it is written
a Heat Of Reaction
the enthalpy change caused by dissolving a substance
e Heat Of Solution
the energy required to melt a solid at its melting point
d Heat Of Fusion
the change in enthalpy that accompanies the formation of a compound from its elements
b Heat Of Formation
states that if you add two or more thermochemical equations to give a final equation, you can also add the heats of reaction to give the final heat of reaction
C Hess's law of heat summation
What happens to the energy produced by burning gasoline in a car engine? a. The energy is lost as heat in the exhaust.
b. The energy is transformed into work to move the car.
c. The energy heats the parts of the engine.
d. all of the above
d
A piece of metal is heated, then submerged in cool water. Which statement below describes what happens? a. The temperature of the metal will increase.
b. The temperature of the water will increase.
c. The temperature of the water will decrease.
d. The tem
d
How does a calorie compare to a joule?
a. A calorie is smaller than a joule. c. A calorie is equal to a joule.
b. A calorie is larger than a joule. d. The relationship cannot be determined.
b
What would likely happen if you were to touch the flask in which an endothermic reaction were occurring?
a. The flask would probably feel cooler than before the reaction started.
b. The flask would probably feel warmer than before the reaction started.
c.
a
When energy is changed from one form to another, ____.
a.some of the energy is lost entirely
b. all of the energy can be accounted for
c. a physical change occurs
d. all of the energy is changed to a useful form
b
If heat is released by a chemical system, an equal amount of heat will be ____.
A. absorbed by the surroundings
C. released by the surroundings
B. absorbed by the universe
D. released by the universe
a
Which of the following is transferred due to a temperature difference?
a. chemical energy c. electrical energy
b. mechanical energy d. heat
d
In an exothermic reaction, the energy stored in the chemical bonds of the reactants is ____.
a. equal to the energy stored in the bonds of the products
b. greater than the energy stored in the bonds of the products
c. less than the energy stored in the bo
b
A process that absorbs heat is a(n) ____.
a. endothermic process c. exothermic process
b. polythermic process d. ectothermic process
a
When your body breaks down sugar completely, how much heat is released compared to burning the same
amount of sugar in a flame?
a. The body releases more heat.
b. The body releases less heat.
c. The body releases the same amount of heat.
d. The body relea
c
The quantity of heat required to change the temperature of 1 g of a substance by 1�C is defined as ____.
a. a joule c. a calorie
b. specific heat d. density
b
A piece of candy has 5 Calories (or 5000 calories). If it could be burned, leaving nothing but carbon dioxide
and water, how much heat would it give off?
a. 500 calories c. 5000 joules
b. 5 kilocalories d. Not enough information is given.
b
How many joules are in 148 calories? (1 cal = 4.18 J)
a. 6.61 J c. 148 J
b. 35.4 J d. 619 J
d
What is the amount of heat required to raise the temperature of 200.0 g of aluminum by 10�C? (specific heat
of aluminum = 0.21 cal
g�C
)
a. 420 cal c. 42,000 cal
b. 4200 cal d. 420,000 cal
a
What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312-g sample by
15�C?
a. 0.033 cal
g�C
c. 0.99 cal
g�C
b. 0.33 cal
g�C
d. 1.33 cal
g�C
b
How can you describe the specific heat of olive oil if it takes approximately 420 J of heat to raise the
temperature of 7 g of olive oil by 30�C?
a. greater than the specific heat of water c. equal to the specific heat of water
b. less than the specific h
31 b
Which of the following has the greatest heat capacity?
a. 1000 g of water c. 1 g of water
b. 1000 g of steel d. 1 g of steel
33 a
By what quantity must the heat capacity of an object be divided to obtain the specific heat of that material?
a. its mass c. its temperature
b. its volume d. its energy
34 a
The amount of heat transferred from an object depends on which of the following?
a. the specific heat of the object c. the mass of the object
b. the initial temperature of the object d. all of the above
35 d
What does the symbol ?H stand for?
a. the specific heat of a substance
b. the heat capacity of a substance
c. the heat of reaction for a chemical reaction
d. one Calorie given off by a reaction
36 c
The heat content of a system is equal to the enthalpy only for a system that is at constant ____.
a. temperature c. pressure
b. volume d. mass
37 c
What is the standard heat of reaction for the following reaction?
Zn(s) + Cu2 +
(aq) ? Zn2 +
(aq) + Cu(s)
(?Hf
0
for Cu2 +
= +64.4 kJ/mol; ?Hf
0
for Zn2 +
= -152.4 kJ/mol)
a. 216.8 kJ released per mole c. 88.0 kJ absorbed per mole
b. 88.0 kJ released per
39 A
The amount of heat needed to melt one mole of a solid at a constant temperature is called ____.
a. molar heat of fusion c. heat of reaction
b. molar heat of solidification d. enthalpy
41 A
The ?H is ____.
a. always negative
b. always positive
c. sometimes positive, sometimes negative
d. always 0
45 C
The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances
in their standard states at 25�C, is called ____.
a. enthalpy c. standard heat of formation
b. heat of reaction d. heat of solidification
47 C
Calculate ?H for the reaction of sulfur dioxide with oxygen.
2SO2
(g) + O2
(g) ? 2SO3
(g)
(?Hf
0
SO2
(g) = -296.8 kJ/mol; ?Hf
0
SO3
(g) = -395.7 kJ/mol)
a. -98.9 kJ c. 197.8 kJ
b. -197.8 kJ d. Not enough information is given.
50B
?Hf
0
for the formation of rust (Fe 2O3
) is -826 kJ/mol. How much energy is involved in the formation of 5
grams of rust?
a. 25.9 kJ c. 66 kJ
b. 25.9 J d. 66 J
49 A