Matter Flashcards
(23 cards)
How do you calculate density
Density = mass ÷ volume
What are the units of density
g/cm^3 or kg/m^3
What does density decide
Whether an object floats or sinks
How to find volume of irregular object
Use a eureka can and a measuring cylinder to measure displacement
What does density vary with
State
What is specific heat capacity
The amount of energy required to heat 1 unit of mass of a liquid by 1°C
Give the equations for SHC
∆Q = m x c x ∆Temperature
Change in thermal energy = mass x specific heat capacity X change in temp
Give the unit for SHC
J/kg°C
What is specific latent heat
Amount of energy needed to change 1kg of a substance from 1 state to another, without changing it’s temperature
Give the equations for specific latent heat
Q = m x L
Thermal energy = mass x specific latent heat
Give the unit for specific latent heat
J/kg
What causes pressure in gases
Gas particles colliding with a container which exerts a force on the container
How does gas pressure vary
With volume and temperature
What is the relationship between pressure and volume
P1 x V1 = P2 x V2
What is pressure measured in
Pa ( pascals)
What is absolute zero
0 Kelvin or -273°C
What happens to particles at absolute zero
They have as little kinetic energy as possible and are pretty much still
How do you convert between degrees celcius and kelvin
Add 273 and vice versa
Why does doing work on a gas increase temperature
When force is applied against a pressure, energy is transferred to the kinetic energy stores of the gas particles which increases the internal energy and increases the temperature
What is pressure
The force per unit area
How to calculate pressure
P = F ÷ A
Pressure = force ÷ area
What does fluid pressure depend upon
Depth and density
How do you calculate pressure due to a column of liquid above a certain depth
P = h x p x g
Pressure = height of column x density of liquid x gravitational field strength
