Chemistry - Particle Theory: Diffusion

In this MEL Academy lesson your children will:

  • learn the science behind diffusion
  • perform chromatography analysis
  • obtain beautiful chemical reefs

Lesson time

11:00am   PST (San Francisco, Seattle, ...)
12:00pm   MST (Phoenix, Denver, ...)
1:00pm   CST (Chicago, Houston, ...)
2:00pm   EST (New York, Toronto, ...)
7:00pm   GMT (London, ...)

Lesson duration: 45-55 minutes.

Prepare in advance

In this lesson, we will conduct several DIY experiments. Prepare in advance household materials shown below.

DIY Materials

  colourful (e.g. fruit) tea bags
  access to water (cold and hot)
  2 x transparent plastic cups
  glass bowl
  felt-tip pens or highlighters (not sharpies)
  5x sheet of paper towel or coffee filter paper
  3x tall glass
  4x white round chalk (optional)
  plate (optional)
  rubbing alcohol (optional)


Please, download and print this worksheet in advance. You’ll need to refer to it during the lesson.

MEL Experiment

If you are a subscriber of MEL Chemistry then you can conduct Chemical reefs experiment from the Diffusion chemistry set:



This lesson is presented by Mark Maclaine:

Mark Maclaine

Mark has been an educator for 20 years and has taught more than 20,000 hours of one-on-one lessons to over 1200 students. He initially struggled in school as the academic study didn’t come naturally to him. What was a weakness has become one of his greatest strengths - finding he is able to connect with students who are themselves struggling. Using a set of skills developed over the past two decades and his RELATE Teaching Method, Mark has become one of the best-known educators in the world. He is passionate about his work and is committed to transforming the education system so it works for everyone.