English National Curriculum - Science

Rate of decay

Mission Objectives

Apply factors that affect the rate of decay to real life situations

Explain why factors speed up or slow down decay

Investigate the effect of temperature on the rate of decay of fresh milk

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Keywords

Words and meanings to learn

decomposition

the process by which organic substances are broken down into simpler organ

moisture

the presence of water, often in the form of humidity or dampness, within a substance or environment.

temperature

a measure of the warmth or coldness of an environment or substance, typically expressed in degrees Celsius (°C)

aerobic

refers to processes or organisms that require oxygen to survive and function.

anaerobic

refers to processes or organisms that occur or live in environments without oxygen.

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

Handouts 

Per group: A small beaker containing single cream (dilute a little bit with milk to make it a little easier to pipette)(not UHT)

  • A small beaker containing sodium carbonate solution (0.05 mol dm−3 : 5g sodium carbonate in 1litre of water))
  • A small beaker containing 5% lipase solution
  • 3 Water baths at 30, 40, 50C.

      And test at Room temperature

  • Test tubes
  • Test tube rack
  • Marker pen
  • 1, 3 and 5 ml plastic pipettes
  • thermometers
  • Stop clock 
  • Cresol red
  • An electric kettle, for heating water
  • Ice, for investigating temperatures below room temperature.
  • pH meter for demo
  • Stirrers

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