Energy of Matter Flashcards
what is specific heat capacity
the amount of energy needed to raise temperature of 1kg of a material by 1 degrees celcius
give two reasons why the pressure of a gas in a sealed container increases it its temperature is increased
the molecules move faster so they hit the surfaces with more force and the number of impacts per second increases, so the total force of the impacts increases
what causes the pressure of a gas on a surface
the force of the gas particles hitting the surface
give 2 reasons why the temperature of gas increases if it is compressed quickly
the force applied to compress the gas results in work being done to the gas, and the energy gained by the gas is not transferred quickly enough the surroundings
on a graph of temperature against time for a substance being heated/cooled, what do horizontal, flat sections show
the time when the substance is changing state and the temperature isn’t changing
what is specific latent heat of vaporisation of a substance
energy required to change 1kg of the substance from liquid to vapour at its boiling point, without changing its temperature
what is specific latent heat of fusion of a substance
energy required to change 1kg of the substance from solid to liquid at its melting point- without changing its temperature
what is the specific latent heat of a substance
the energy required to change the state of 1kg of that substance with no change in temperature
what is the name given to the energy transferred when a substance changes state
latent heat
what is the internal energy of a substance
total kinetic energy and potential energy of all the particles in the substance
why is the mass of a substance conserved when its state changes
the number of particles doesn’t change
why are changes of state physical changes
no new substances are produced and the substance will have the same properties as before if the change is reserved
what happens to particles in substances if its temperature is increased
the particles move faster and the amount of energy in the kinetic store increases
which 2 quantities do you need to measure to find the density of a solid/liquid
-mass
-volume
