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Thermochemistry
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Terms in this set (26)
What is the SI unit of energy?
Joule
What is the quantity of heat needed to change the temperature of 1g of a substance by 1 C?
Specific Heat
The energy required to melt a solid at its melting point is called?
Heat of fusion
What is the device used to measure the heat absorbed or released during a chemical or physical process?
Calorimeter
What is referred to as the quantity of heat needed to raise the temperature of 1 g of water by 1 C?
Calorie
A piece of metal is heated, then submerged in cool water. What will happen?
The temperature of the water will increase and the temperature of the metal will decrease.
When energy is changed from one form to another, _______.
All of the energy can be accounted for
A process that absorbs heat is a(n) _______.
Endothermic process
If heat is released by a chemical system, an equal amount of heat will be _____.
Absorbed by the surroundings
The heat capacity of an object depends in part on its ____.
Mass
On what principle does calorimetry depend?
Law of conservation of energy
The amount of heat released by the complete burning of 1 mole of a substance is the _____.
Heat of combustion
Standard conditions of temperature and pressure for a thermochemical equation are _____.
25 C and 101 kPa
What does the symbol of delta H stand for?
The heat of reaction for a chemical reaction.
The heat content of a system is equal to the enthalpy only for a system is at constant ____.
Pressure
What is the heat of solution?
The amount of heat absorbed or released when a solid dissolves
During a phase change, the temperature of a substance _____.
Remains constant
The amount of heat needed to condense a vapor at a constant temperature is called _____.
Heat of condensation
The heat of solidification is always (positive/ negative).
Negative
The heat of fusion is always (positive/negative).
Positive
What is the amount of heat required to raise the temperature of 100.0 g of aluminum by 10 C? (specific heat of aluminum = 0.21 cal/g C)
210 cal
How many joules of heat are required to raise the temperature of 125 g of aluminum from 20 C to 80 C? (specific heat of aluminum = 0.90 J/g C)
6750 J
It takes 770 joules of energy to raise the temperature of 50.0 g of mercury by 110C. What is the specific heat of mercury?
.14 J/g C
How much heat is required to melt 1.6 grams of a substance (H = 30.2 kJ/g) at its melting point?
48 kJ
The specific heat capacity of graphite is 0.71 J/g C . Calculate the energy required to raise the temperature of 750 g of graphite by 160C.
85,000 J
When 45 g of an alloy, at 25 C, are dropped into water, the alloy absorbs 75.6 J of heat. If the final temperature of the alloy is 37 C, what is its specific heat?
-.140 J/g C
-Mercury
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