P1.1/2 Flashcards
What is density
Density is a measure of how much matter is contained within a given volume.
Formula for density
ρ = 𝐦/𝐕
What is temperature
Temperature is the measure of the average kinetic energy of particles in a substance
If you increase the temp…
You increase the energy
What is internal energy
Kinetic energy + potential energy
Kelvin =
Degree Celsius + 273
Absolute 0
-273 degrees or 0 Kelvin
Zero Kelvin implies
Zero kinetic energy
What is specific heat capacity
The heat energy required to raise the temperature of 1kg of a substance by 1 Kelvin.
Units of specific heat capacity
J/kgK
Joules per kilogram Kelvin
The lower the specific heat capacity…
the easier/quicker the substance will change temperature, as less energy is required.
Specific heat capacity formula
E = m x c x Δϴ
E = energy supplied, J m = mass of substance, kg c = specific heat capacity, J/kg oC or K Δϴ = temperature change, oC or K
In a temperature - time graph…
Melting/boiling points are the vertical lines
Implying there is no temp change / KE change during a state change
What is potential energy
Energy due to the position of the particles + the strengths of bonds between them
If a temperature change occurs during heating/cooling…
Only KE has changed
- specific heat capacity
