Heating Processes Flashcards
What is the specific heat capacity of a substance
The amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius
What is the relationship between energy, mass, specific heat capacity and temperature change
Energy = mass x specific heat capacity x temperature change
What is the specific latent heat of vaporisation of a substance
The amount of energy required to change the state of one kilogram of the substance from a liquid to a vapour with no change in temperature
What is the relationship between energy , mass and specific latent heat of vaporisation
Energy = mass x specific latent heat of vaporisation
What is the specific latent heat of fusion of a substance
The amount of energy required to change the state of one kilogram of the substance from a solid to a liquid with no change in temperature
What is the relationship between energy , mass and specific latent heat of fusion
Energy = mass x specific latent heat of fusion
What are the melting point of a solid and the boiling point of a liquid affected by
Impurities
What happens in a cooling curve
Temperature remains constant because energy is released during the formation of bonds
They release of energy compensates the energy lost to the surroundings and keeps the temperature constant
What happens in a heating curve
Particles of ice gain energy from the surroundings. The average kinetic energy of the particles increases and so does the temperature.
Energy from the surroundings is used to break the bonds between the ice particles instead of increasing the kinetic energy of the particles. Average kinetic energy of particles remain constant, so temperature remains constant.
When the solid has transformed into a liquid, energy from the surroundings goes into raising the average kinetic energy and the temperature increases
Energy may be transferred by
Conduction and convection
Convection
Convection occurs when particles with a lot of heat energy in a liquid or gas love and take the place of particles with less heat energy
Factors affection the rate of evaporation
Increasing the surface area of a liquid
Increasing the temperature of the liquid
Creating a fraught of air across the liquids surface
The bigger the temperature difference between an object and its surroundings
The faster the rate at which energy is transferred by heating
