# 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/m^{3}

mass - kg

Volume - m^{3}

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.