What is being taught lesson by lesson:

  • Introduction to particle theory. We will find out what you already know and address any misconceptions you may have picked up.
  • Measuring the density of regular solid objects
  • Calculation of results followed by finding out the density of irregular objects using Archimedes’ principle.
  • Differences between physical and chemical changes.
  • The internal energy of particles in a closed system.
  • Mars colony problem solving.
  • The Specific Heat capacity of substances. Measuring and calculating.
  • Specific latent heat.
  • Particle motion in gases. Calculations using PV=constant.

Key Terms for this topic (Tier 3 vocabulary)

Density – matter – displacement – internal energy – latent heat.

Particle Model of Matter

Are you ready for your assessment in this topic? Try out this simple quiz.

What everyone needs to know:

Density is the mass of an object divided by its volume. The volume can be calculated or for an irregular shape, measured using a displacement can or a measuring cylinder.

List all of the potential changes of state and the names of the process of changing between them (boiling, freezing etc.) Internal energy is a measure of the kinetic energy of the particles within a substance, when it is heated, the internal energy of the substance increases until it changes state.

Measuring the change in energy is done by referring to the specific heat capacity: ΔE = m c ΔΘ

Change in energy = mass x specific heat capacity x change in temperature.

Energy is needed to “rearrange” the particles in a substance when it changes state, this energy is called the Specific Latent Heat. When changing state, the temperature does not change. E=mL

Energy = mass x specific latent heat.

Finally, describe the random motion of particles in a gas. By changing the temperature at a constant volume will increase the pressure. You must be able to link this relationship and describe how one thing causes the other.

Required practical 17 – Measure the density of an object with an irregular shape. Use appropriate equipment and measurements.

Extra topics needed for the Higher papers:

In this topic, there is nothing extra for the higher papers, the questions will just be more challenging.