ENDTERM Flashcards
Adding energy to the system,
or removing it, changes the
system’s thermal energy. True of False?
True
What happens to a system when you change
its thermal energy?
The temperature of the system changes. The system undergoes a phase change, such as melting or freezing
Adding _____ C of energy raises the temperature of __ kg of water by __ K.
4190C, 1kg , 1K
How much energy you will need in order for you to raise the temperature of a 1kg gold by 1 K?
129 J
What is the heat equation?
Q = mc△T, where:
m = mass of object (g)
c = specific heat of the object (cal / gram C)
The amount of energy that raises the temperature of 1 kg of a substance by 1 K is called the ______.
Specific Heat
_____ has specific heat (c) = 4190 J/kg K.
Water
The specific heat of gold is c gold = ?
129 J/kg K
It is a measure of a material’s resistance to temperature change.
Thermal Inertia ( T = square root of (density x heat conductivity x specific heat)
The molar specific heat is the
amount of energy that raises
the temperature of ____ mol of a substance by ____ K.
1 mol, 1K
Most solids have molar heat capacity very near at __ J/mol K.
25
The slope of the graph depends inversely on the system’s specific heat. True or False?
True
The thermal energy continues to increase during a phase change, but the additional energy goes into _____ molecular bonds rather than ______ the molecules.
breaking , speeding up
Spot the incorrect word.
A phase change is characterized by a change in thermal energy with a change in temperature.
‘with’ should be ‘without’.
The amount of heat energy that causes1 kg of a substance to undergo a phase change is called the ______ of that substance.
heat of transformation
________ is a generic term that refers to any phase change.
Heat of transformation
Two specific heats of transformation are the ______ , the heat of transformation between a solid and a liquid, and the _______ , the heat of transformation between a liquid and a gas.
heat of fusion, heat of
vaporization
When two objects are in direct contact, such as soldering iron and the circuit board, heat is transferred by
conduction
Air currents near a lighted candle rise, taking thermal energy with them in a process.
convection
Blowing a hot cup of tea or coffee cools.
Evaporation
Wc
work by conservative forces
Is the energy transferred between system and the environment when a net force acts on a system
Work
What does the mechanical interaction process means?
system and the environment interact via macroscopic pushes and pull
Work is positive when the force us in direction of motion and negative if otherwise.
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