as the kinetic energy of the molecules in a substance increases, the
What is temperature of substance increases
100
The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius
specific heat
100
energy (heat)=(mass)(specific heat)(x)?
What is x?
What is change in temperature
100
When is the sign of heat (for a system) positive?
When heat flows into a system
100
During a phase change, what type of energy changes?
potential energy
200
a block of copper (specific heat=.385) requries 625,000 J of thermal energy to change in temperature from 27C to 139C. WHAT IS THE MASS OF THE COPPER BLOCK?
What is 14,494 g
200
thermal energy
What is random and disorganized motion of molecules?
200
work is a transfer of _________
What is energy
200
When is the heat for a system negative?
When heat leaves a system
200
How can you identify a phase change in a heating curve?
the temperature doesn't change
300
temperature is
proportional to the average kinetic energy of molecules
300
absolute zero
where all movement ceases (0 K)
300
If a cup of coffee is 80 degrees Celsius and an ice cube is added, how does heat flow?
from the coffee into the ice cube
300
When you push down on a piston, the sign of work (system is piston) for the system is
Positive
300
Why doesn't the temperature change during a phase change?
Heat is converted into potential energy rather than kinetic energy
400
what is the specific heat of substance that requries 99,100 J of thermal energy to heat 3470 g of this substance from 11C to 45C
What is .839
400
heat
What is a form of energy that is transferred by a difference in temperature
400
if the mass of a moving object is doubled,thermal energy will?
double
400
When warm air rises (system = warm air) what is the sign of work for the system?
Negative
400
Why is the heat of vaporization greater than the heat of fusion for water?
It takes more energy to change the intermolecular forces in the liquid state to that found in the gas state.
500
convert 305 K to the Celsius scale
What is 32C
500
1st law of thermodynamics
A restatement of the Conservation of Energy
500
When an object is heated it tends to (think about volume)____________.
expand
500
If the system is well-insulated, what kind of a system is it?
Adiabatic
500
What variable is kept constant when considering a heating curve?