P1 - Heat Flashcards
which way does heat travel? hot to cold or cold to hot, why?
hot to cold because the hot side has more energy than the cold side so the energy travels to the cold side to keep it equal
what is the absolute temperature scale?
°K or kelvin
what it temperature a measure of?
Hotness
What is the equation for energy using Specific Heat Capacity?
Energy= Mass x Specific Heat Capacity x Temp. Change
What are the two common measures of temperature?
oC (degrees Celsius) oF (degrees Fahrenheit)
If there is a difference in temp what will happen?
The energy will flow between them but them.
Why does the line on a graph go flat when changing state?
The energy is still being put in but they are being used to break intermolecular bonds.
Define specific latent heat.
The energy needed to change state to melt 1kg of material without changing the temperature.
How do you work out energy with SLH?
Energy= Mass x Specific Latent Heat
How do you convert Kj to J?
Divide by 1000
Where does conduction mainly occur?
In solids
What is conduction?
Process where vibrating particles pass on extra kinetic energy.
Why do metals conduct heat well?
Because there is a cloud of free moving delocalised electrons so they move and collide more in the same time.
Why do non-metals take longer to warm up?
They don’t have any free electrons so warm up more slowly.
What is convection?
Convection occurs when more energetic particles move from a hotter region to the cooler region.
