Properties of matter Flashcards
What is the name of the measure of the mean kinetic energy of the particles in a substance?
Temperature
What does the specific heat capacity of a substance mean?
The specific heat capacity of a material is
the energy required
to raise one kilogram (kg) of the material
by one degree Celsius (°C).
When do you use specific latent heat of fusion
When changing from solid to liquid
What is temperature of a substance a measurement of?
The mean kinetic energy of the particles in that substance
When do you use latent heat of vaporisation?
When changing from liquid to gas
How do you change from degrees C to degrees Kelvin?
Add 273
Which unit of temperature do you use in the gas law equations?
Kelvin
What is the name for 0 Kelvin?
Absolute zero
What is the unit symbol for pressure?
Pa
Pascals
What is meant by absolute zero?
0 K
this is the same as -273 degrees C
What is the symbol on the formula sheet for heat energy?
Eh
What is the symbol on the formula sheet for pressure?
p
small p is pressure
big P is power
What is the symbol on the formula sheet for Area?
A
What is the symbol on the formula sheet for energy?
E
What is the symbol on the formula sheet for temperature?
T
big T is temperature
little t is time
What is the symbol on the formula sheet for volume?
V
watch out V is volume and V is voltage so make sure you’re on the right bit of the formula sheet!
What is the symbol on the formula sheet for specific heat capacity?
c
What is the symbol on the formula sheet for specific latent heat?
l
What is the symbol on the formula sheet for mass?
m
What does ΔT mean on the formula sheet
change in temperature
it doesn’t matter whether you use degree C or Kelvin for this the answer will be the same
What units should you use for temperature for these Gas Laws?
(p1/T1=p2/T2, V1/T1=V2/T2,
pV/T=constant)
Kelvin
Explain
in terms of the kinetic model
what happens to pressure when
volume decreases
- Volume decreases
- So particles collide with the walls more frequently
- So force on the walls is greater
- So pressure increases (because P=F/A)
Explain
in terms of the kinetic model
what happens to pressure when
temperature decreases
- Temperature decreases
- so kinetic energy of the particles decreases
- so particles hit the walls less frequently
- so particles hit the walls with less force
- so pressure decreases
Explain
in terms of the kinetic model
what happens to pressure when
volume increases
- Volume increases
- So particles collide with the walls less frequently
- So force on the walls is lower
- So pressure decreases (because P=F/A)
Explain
in terms of the kinetic model
what happens to pressure when
temperature increases
- Temperature increases
- so kinetic energy of the particles increases
- so particles hit the walls more frequently
- so particles hit the walls with more force
- so pressure increases
