Partics Model Of Matter Flashcards
What is always Conserved when a substance, undergoes, a change of state
Mass
How does a change of state different from a chemical change?
In a change of state, the material can return tapping its previous properties, if the change is reversed
What is sublimation?
When a solid changes into a gas without passing through a liquid state
When water boils in an open pain why does the mass of the pan of water appear to decrease?
Some of the water will evaporate in turn into water vapour. This will lead the pan mean in the mass of the pain will decrease the mass of the whole system however, remains constant
explain the process is involved with the bathroom mirror mists up
Hot water evaporates from to form water vapour
This water vapour lands on the cooler mirror
The vapour condenses and returns to liquid state on the mirror surface 
What is the internal energy of a substance?
The energy stored by the particles
The sum of the total kinetic and potential energy is that make up the system
How does heating effect the energy of a substance?
Heating transfers energy to the substance
Increase is the energy of the particles that make up the substance
What are three factors determine the temperature change of a system
Mass of substance, being heated
Type of material
Energy inputted into the system
Describe how the internal energy and temperature of a substance changes when a change of a state occurs
The internal energy of the substance will be increased or decreased
The temperature of the substance will remain constant
Define specific latent heat
The amount of energy needed to change the state of 1 kg of substance, with no change in temperature
What is the specific latent heat of fusion?
The energy required to change 1 kg of a substance from a solar state to a liquid state without a change in temperature
What is the specific latent heat of vaporisation?
Energy required to change 1 kg of a substance from a liquid state of gas day without a change in temperature
Describe the motion of molecules in a gas
They are constant random motion
What factors affect the average kinetic energy of a gas molecule?
The temperature of the substance
The higher the temperature, the higher, the average kinetic energy of the monocle
What effect does increasing temperature have on the pressure of a gas when held constant volume
Pressure of the gas will increase as the temperature increases
Why does pressure increase as temperature increases(at a constant volume)?
Kinetic energy of molecules increase
Collisions between molecules become more frequent
Greater rate of change of momentum
Greater force and therefore pressure
If gas a is it low pressure, and Gas b is at high pressure, what can be said about the rate of collisions in each gas?
There are more collisions per second in gas, bathing in gas a
Describe the force that the pressure of a gas exerts on the walls of its container
The net force acts at right angles to the container surface
The force increases as pressure increases
Explain how increasing the volume of a gas resource in a decrease of pressure
Molecules become more spread out and so time between collision increases
This reduces the rate of collisions
Rate of change of momentum decreases, and so far so exerted on a container decreases, resulting in lower pressure
What can be said about the product of pressure and volume for fix mass of gas at a constant temperature
It is constant
What is the unit used for pressure?
Pascal (Pa)
What increases when you do work on a gas?
The internal energy of the gas, this can also lead to an increase of temperature
Why does the temperature of a inside a bike pump increase when it is pumped
Work is done and the gas when it is compressed
Doing work on a gas increases its internal energy, so also increases the average kinetic energy of the molecules
Temperature increases with an increase of average kinetic energy 
