molecules are packed together, and it keeps its shape, do not flow, particles are packed closely together and are not free to move about and the particles vibrate.
1 of 18
what are the properties of a liquid?
Liquids take on the shape of their container and particles have more space between them, so they are not fixed in position and therefore move randomly.
2 of 18
what are the properties of a gas?
they are easy to compress, they expand to fill their containers, andthey occupy far more space than the liquids or solids.
3 of 18
how do you calculate density?
density=mass/volume
4 of 18
what are the names of the changes of state
melt, freeze, boil, evaporate, condense or sublimate
5 of 18
Describe how, when substances change state, mass is conserved.
The particles in a substance stay the same when it changes state so the mass of the substance stays the same.
6 of 18
Is changing state a physical change or a chemical and why
changes of state are physical changes which differ from chemical changes because the material recovers its original properties if the change is reversed
7 of 18
what happens when you heat matter
heating increases the internal energy stored within the system by increasing the energy of the particles that make up the system. This either raises the temperature of the system or produces a change of state.
8 of 18
In the system what does the increase n temperature depend on?
, the increase in temperature depends on the mass of the substance heated, the type of material and the energy input to the system.
9 of 18
what is the specific heat capacity of a substance?
as the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius
10 of 18
Describe what happens to particles during a change of state
When a liquid is heated, the particles are given more energy. They start to move faster and further apart. At a certain temperature, the particles break free of one another and the liquid turns to gas. This is the boiling point.
11 of 18
what is the energy needed for a substance to change state
latent heat
12 of 18
what is the specific latent heat of a substance
the amount of energy required to change the state of one kilogram of the substance with no change in temperature.
13 of 18
what is the specific latent heat of fusion
s the heat needed to change a mass of 1 kg the substance from a solid at its melting point into liquid at the same temperature.
14 of 18
Describe how gas molecules move
There are no bonds between the particles in a gas, so they are free to movequickly in any direction.
15 of 18
What is temperature related to
the average kinetic energy of the molecules
16 of 18
Explain what happens to the gas molecules if you increase their temperature
Faster moving particles will collide with the container walls more frequently and with greater force. This causes the force on the walls of the container to increase and so the pressure increases.
17 of 18
Explain the relationship between the temperature of a gas and it’s pressure (if held at a constant volume)
The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant
18 of 18
Other cards in this set
Card 2
Front
what are the properties of a liquid?
Back
Liquids take on the shape of their container and particles have more space between them, so they are not fixed in position and therefore move randomly.
Comments
No comments have yet been made