Vocabulary
Fahrenheit and Celsius
In what unit is energy measured?
J, Joules
As the temperature of an object decreases, its thermal energy _______________
decreases
2 kg of copper was heated from 5*C to 10*C. How much energy was used to heat the copper? (Specific heat of Cu is 1 J/kg x *C)
10 J
what unit is mass measured in?
kilogram
measure of the average kinetic energy of the particles that make up that object
temperature
In the formula Q = m(Tf - Ti)C, the variable Q represents:
Change in thermal energy
If the mass of an object decreases, the thermal energy of that object ___________________
decreases
5 kg of zinc was heated from 15*C to 40*C. How much energy was used to heat the zinc? (Specific heat of Zn is 2.5 J/kg x *C)
3125 J
the ability to cause change or do work
energy
the sum of the kinetic energy and the potential energy of all of the particles that make up an object
thermal energy
In what unit is specific heat measured?
J/kg x *C
Joules per kilogram times degrees Celsius
Objects that are cold to the touch have __________ kinetic energy than objects hot to the touch.
Less
15.5 kg of iron was cooled from 95*C to 30*C. How much energy was used to heat the iron? (Specific heat of Fe is 3.3 J/kg x *C)
3324.75 J
kinetic energy is energy in motion, potential energy is motionless, stored energy
energy that is transferred between objects due to a temperature difference
heat
In the formula Q = m(Tf - Ti)C, the variables (Tf - Ti) represent:
Final temperature - initial temperature
OR
Change in temperature
Thermal energy is dependent upon these two things:
Mass and temperature
What is the specific heat of an unknown substance if a 6 kg sample releases 38 J as its temperature changes from 15*C to 25*C?
0.63 J/kg x *C
energy is easily ______________ from one form to another
converted
amount of heat needed to raise the temperature of 1 kg of that material by 1 *C
specific heat
In the formula Q = m(Tf - Ti)C, the variable C represents:
Specific heat
In all matter, atoms and molecules are in _____________ motion.
Constant, random
What is the specific heat of an unknown substance if a 7.8 kg sample releases 4 J as its temperature changes from 70*C to 58*C?
0.04 J/kg x *C
Name the three subatomic particles that make up atoms.
proton, electron, neutron