Particle Model Of Matter P1T3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (23 张)
What is the definition of density? State to the relevant equation with units
Density equals mass divided by volume Density is KG/M cubed Mass is KG Volume is M cubed 
What is always conserved when a substance undergoes a change of state?
Mass 
How does a change of state differ from a chemical change?
In a change of state the material can return to having its previous properties if the changes reversed 
What is the internal energy of a substance?
The energy stored by the particles The sum of the total kinetic and potential energies that make up the system 
How does heating affect the energy of a substance?
Heating transfers, energy to the substance It increases the energy of the particles that make up the substance 
What two things can heating a substance do?
Raise its temperature Change the state of the substance 
State the equation used to calculate the temperature change when a substance is heated
 Change in thermal energy= mass x specific heat capacity x temperature change 
Define specific heat capacity
The amount of energy needed to increase the temperature of 1 kg of a substance by 1° C 
Describe how the internal energy in temperature of a substance changes when a change of state occurs
The internal energy of the substance will be increased or decreased. The temperature of this substance will remain constant. 
Define specific latent heat
The amount of energy needed to change the state of 1 kg of a substance with no change in temperature 
State the equation for the energy required to change state
Energy to change state= mass x specific latent heat
What is the specific latent heat of fusion?
The energy required to change 1 kg of the substance from solid state to liquid state without a change in temperature 
What is the specific latent heat of vaporisation?
The energy required to change 1 kg of a substance from a liquid state to a gas state without a change in temperature 
What factor affects the average kinetic energy of gas molecules?
The temperature of the substance The higher the temperature, the higher the average kinetic energy of the molecules 
What effect does increasing the temperature have on the pressure of a gas when held at constant volume?
Pressure of the gas will increase as the temperature increases 
Why does pressure increase as temperature increases?
Kinetic energy of molecules increases Collisions between molecules becomes more frequent Greater rate of change of momentum Greater force and therefore pressure 
If gas A is at a low pressure in gas B is at a high pressure what can be said about the rate of collisions in each gas?
There are more collisions per second in gas B then gas A The rate of collisions is higher in B 
Describe the force that the pressure of a gas exerts on the walls of its container
The net force acts at at right angles to the containers surface The force increases as pressure increases 
Explain how increasing the volume of a gas result in a decrease of pressure
Molecules become more spread out and so time between collisions increases This reduces the rate of collisions Rate of change of momentum decreases and so force exerted on container decreases resulting in a lower pressure 
What can be said about the product of pressure and volume for a fixed mass of gas at a constant temperature
It is constant 
What is the unit used for pressure?
Pascal Pa
Will 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 air inside a bike pump increase when it’s pump?
(work) is done on a gas when it is compressed Doing work on a gas increase increases its internal energy so also increases the average kinetic energy of the molecules Temperature increases with an increase of average kinetic energy