Properties of Matter (Heat) Flashcards
specific heat capacity definition
the amount of heat energy required to raise the temperature of 1kg of a substance by 1 degree celsius
what is meant by the temperature of a substance?
the mean kinetic energy of its particles
what is the principle of conservation of energy?
energy cannot be created or destroyed, only transferred
specific latent heat definition
the amount of heat energy required to change the state of 1kg of a substance
specific latent heat of fusion
energy required to change 1 kg of a substance from solid to liquid
specific latent heat of vapourisation
energy required to change 1 kg of a substance from liquid to gas
Pressure is…
the amount of force acting on 1 square metre
How does the kinetic model account for the pressure of a gas
Gas particles move quickly in all directions, applying a force when they hit a surface
0 degrees celsius is equal to ______ degrees Kelvin
273K
What is the temperature of absolute zero?
0K or -273 degrees celsius
Explain why the pressure of a gas increases as the volume decreases (constant temperature)
The gas particles have less distance between the container walls so hit the walls more often (They are going at a constant speed since the temperature is constant.)
Explain why the pressure of a gas increases as the temperature increases (constant volume)
Gas particles gain kinetic energy/move faster. The particles collide with the container walls more often and with greater force.
Explain why the volume of a gas increases as the temperature increases (constant pressure)
Gas particles gain kinetic energy/move faster. The particles collide with the container walls more often and with greater force. To maintain constant pressure, the container walls move outwards.
