English National Curriculum - Science
Mission Objectives
Explain the difference between potable water and pure water
Describe how ground, fresh and salty water are treated to produce potable water
Give reasons for each step in the water purification process
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Words and meanings to learn
potable water
water that is safe to drink; it contains other dissolved substances, like certain mineral ions
pure water
contains only water molecules
desalination
the process of removing salt and other minerals from sea water to produce potable water
sterilising
the process of killing harmful microorganisms (bacteria, viruses, etc.) in water, often using chlorine or UV light
distillation
a process used to produce pure water by boiling water to create steam, then condensing the steam back into liquid water, leaving impurities behind
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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.
pH tests
• safety goggles
• pure distilled water
• samples of water at different pH values
• universal indicator solution or paper
Dissolved solids
• sample of a prepared salt solution or mineral bottled water (concentration unimportant but
should give good crystal formation when evaporated)
• Bunsen burner
• tripod
• gauze
• heatproof mat
• evaporating basin
• weighing balance.
Distillation
• conical flask with delivery tube with bung/ Liebig condenser
• 1 boiling tube
• ice bath
Handouts
Expert film
Mission assignment film
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