Particle model of matter - Paper 1 Flashcards
To revise particle model of matter. (paper 1)
State the equation with all units for density
Density = mass / volume
Density - kg/m3
mass - kg
Volume - m3
How can the density of a regular shaped object be found?
Find mass using an electronic balance.
Find volume using a ruler to measure the length of each side
Then the equation volume = l x l x l
Use the density equation Density = mass / volume
How can the density of a irregular shaped object be found?
Find mass using an electronic balance.
Find volume using a eureka can
Use the density equation Density = mass / volume
How can a eureka cab be used to find the volume of an irregaulr object?
Fill the eureka can with water
Place the object in the water.
The volume of water will rise by the exact volume as the object.
Collect the dispalced volume of water and measure with a measuring cylinder.
How can the density of a liquid be found?
Find the volume using a measuring cylinder
Place an empty measuring cycling on an electronic balance and record the mass.
Add the liquid and record the new mass.
calculate the mass of the liquid (new mass - old mass)
Use the density equation Density = mass / volume
Describe the state changes in melting
Solid to liquid
Describe the state changes in freezing
Liquid to solid
Describe the state changes in evaporating
Liquid to gas
Describe the state changes in condensing
Gas to liquid
Describe the state changes in sublimation
Solid to gas (missing out the liquid stage)
Define internal energy
Energy is stored inside a system by the particles
State the equation for internal energy
Internal energy = Kinetic energy + potential energy
Why does heating always increase internal energy
Heating will either cause the substance to heat up and its kinetic energy to increase or the substance will change state and the internal energy will increase
If a substance is heating up what factors affect the increase in temperature?
- The mass of the substance
- The material ( the specific heat capacity)
- The rate at which energy is supplied
Define specific heat capacity
The specific heat capacity of a substance is the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius.