Heat, thermal energy, specific energy, energy transformation Flashcards
Conduction convection and radiation are the three ways…
heat changes places (transfers)
Heat just wants to…
move!
Temperature is defined as
the measure of average kinetic energy of EACH particle in an object.
If the particles in an object have more kinetic energy the object is…
hotter
Thermal energy is defined as…
the sum of ALL kinetic energy in the particles of an object.
Adding thermal energy causes a rise in…
temperature
Thermal energy is dependent on — while temperature is not
mass
How do you convert fahrenheit to celsius?
(Fahrenheight-32) x 5/9 = Celsius
Heat wants to move from…
hot to cool
Conduction is the transfer of heat from…
direct touch
Good conductors of heat are
metals.
A good conductor of heat is defined as…
a material that allows electrical charges to flow through them easily.
A good insulator is defined as…
Any material that keeps energy such as heat, or cold from easily transferring through. Wood, plastic, rubber, and glass are good insulators.
Convection is when…
hot air rises and cool air falls.
Radiation is when…
electromagnetic heat waves travel.
Specific heat is…
the amount of heat required to raise the temperature of an object.
When object have stronger bonds it takes more heat energy to break them therefore,
it will have more specific heat.
Thermal expansion is…
the increase in volume of a substance due to increase in temperature.
How would you calculate for changes in thermal energy?
Q (what’s in joules) = M (mass) x Δ T (change in temp) x Cp (specific heat)
The unit for specific heat is…
J/kgC or J/gC
Heat is the..
flow of thermal energy from one object to another.
The Fahrenheit scale is the…
scale based on 32° for the freezing point of water and 212° for the boiling point of water
The Celsius scale is…
the scale of temperature in which water freezes at 0° and boils at 100°
Kelvin scale is the…
a scale of temperature in which absolute zero is zero and kelvins are used as units
Absolute zero is…
the lowest temperature that is theoretically possible
Sound energy is…
the energy produced from vibrations moving through something.
Mechanical energy is…
the energy that an object gains due to its motion or position.
Thermal energy is…
the sum of kinetic energy of all the molecules in a system.
1 calorie is defined as…
the amount of energy it takes to increase the temperature of 1 gram of water.
1 calorie is equal to how many joules?
4.2
If Q in the equation (Q= M x Δ T x Cp) is positive it means that…
heat is flowing into the system.
If Q in the equation (Q= M x Δ T x Cp) is negative it means that…
heat is flowing out of the system.
If an ice cube starts at -10 degrees Celsius and we begin to add heat to it the ice’s temperature will begin to rise but at 0 degrees the heat being added will…
stop increasing because the ice is melting so a phase change is happening.
The amount of heat transferred during a phase change is equal to…
The amount of heat transferred = mass x latent heat
Latent heat is
the heat required to change the phase of a substance and is dependent on the substance.
A change from solid to liquid is known as a
heat of fusion
A change from liquid to gas is known as…
heat of vaporization
