English National Curriculum - Science

Key Stage 3: Which mixture makes the best bubble?

Mission Objectives

Plan a fair test by identifying variables and writing a clear hypothesis

Carry out a fair test safely and record accurate, repeatable results

Analyse results to draw conclusions and evaluate reliability

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Keywords

Words and meanings to learn

mixture

a combination of two or more substances that are not chemically joined and can be separated

investigate

to carry out a careful study or experiment to discover or learn something

bubble

a thin sphere of liquid enclosing a gas

curiosity

a strong desire to learn, explore or discover new things

fair test

an experiment in which only one variable is changed at a time while all other variables are kept the same

This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator with over 15 years of leadership experience and a strong background in scientific analysis. She has a proven record of leading departments effectively, improving practice, and working collaboratively with stakeholders.

In her current work, Samantha embeds evidence-informed pedagogical principles such as retrieval practice, clear modelling, and effective sequencing to support high-quality curriculum design and professional development. She draws on assessment insight and common misconceptions to help teachers secure strong student understanding.

She is a former Head of Chemistry and Sixth Form Tutor at Ilkley Grammar School, with extensive Key Stage 4 and 5 experience, and an AQA examiner, giving her valuable insight into assessment standards and exam requirements.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket. 

Required Resources

  • Washing-up liquid (different brands)
  • Glycerine and sugar
  • Water
  • Measuring jugs/spoons
  • Mixing containers
  • Bubble wands (pipe cleaners/straws)
  • Stopwatches
  • Handouts (core & support)
  • Graph paper or laptops/tablets for data plotting

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