P6 Energy of matter Flashcards
why is mass of a substance conserved when it changes state?
number of particles doesn’t change
what is the internal energy of a substance?
total kinetic and potential energy of all the particles
what is latent heat?
amount of energy transferred when a substance changes state
Why does temperature of gas increase if it is compressed too quickly?
force applied to gas results in work being done to the gas
Why does pressure increase if temperature is increased in a sealed container?
molecules move faster so they hit the surfaces with more force
number of impacts per second increases
what 2 quantities do you need to discover density
mass and volume
specific latent heat definition
the amount of energy required to change the state of 1 kilogram of a material without changing its temperature.
specific latent heat of fusion definition
the energy required to MELT 1kg of a substance with no change in temperature
specific latent heat of vaporisation definition
the energy required to EVAPORATE 1kg of a substance with no change in temperature
atom arrangement in solids
atoms packed tightly
cannot move
can vibrate
fixed position
atom arrangement in liquids
close together
no fixed position
atoms can move past each other
atom arrangement in gases
atoms move randomly at higher speeds
no regular arrangement
well seperated
what are fluids?
A fluid is a substance in which the particles are free to move around. They include both liquids and gases.
