Physics (internal energy) Flashcards
What is specific heat capacity ?
Specific heat capacity is the amount of energy needed to increase the temp of 1kg of a material by 1*c
Materials that get hot with little energy have?
Low specific heat capacity
Materials which need a lot of energy to get hot have?
High specific heat capacity
What is the energy calculation?
Energy=
mass x specific heat capacity x temp change
What is the specific heat capacity calculation?
Specific heat capacity=
energy/ mass x temp change
solid—-liquid
melting
liquid—-gas
boiling
gas—-liquid
condensing
liquid—-solid
freezing
solid—-gas
subliming
What happens when a substance melts or boils?
Sublime energy is absorbed by the substance from the surroundings
What happens when a substance condenses or freezes?
Releases energy into the surroundings
What is the energy absorbed or released by the substance when it changes state?
Latent heat
What is specific latent heat?
The amount of energy required to change the state of 1kg of the substance (NO TEMP CHANGE)
What are the units of specific latent heat?
(J/Kg) (KJ/Kg)
What are the two types of specific latent heat ?
fusion and vaporisation
Fusion
energy needed to melt 1Kg
vaporisation
energy needed to evaporate 1Kg
Kinetic energy
Is the energy the particles have because they are moving.
Potential energy
Is the energy the particles gain when bonds are broken between the particles.
Internal energy
Is the the total kinetic and potential energy of all the particles.
When is kinetic energy used?(1)
when ice is getting hotter but NOT melting
When is potential energy been used?(1)
when ice melts
When is kinetic energy used?(2)
water getting hotter
When is potential energy been used?(2)
water boiling (turning into steam)
