Science Week lesson plan: Chocolate structures (EYFS/KS1/KS2)

Demonstrate how to use melted chocolate to ‘weld’ together edible items to create super-yummy chocolate structures.


  • Lots of chocolate in all shapes, sizes and types
  • Marshmallows, cereal hoops and other small food items
  • Reusable, metal water bottles
  • Hand-hot water


  1. Add hand-hot water to the metal bottle and put the lid on firmly.
  2. Hold the edge of a piece of chocolate against the bottle’s side, keeping hands away from the bottle’s surface.
  3. When the edge of the chocolate piece has melted, use as a ‘cement’ to join it to another piece of chocolate or to other edible items.


When heated, chocolate undergoes a physical change, from a solid to a liquid. As it cools it returns to being a solid. Chocolate melts between 30–40°C which is why chocolate is ‘melt in the mouth’.


  • Can you make a tall chocolate tower?
  • What other super-structures could you make?
  • Does some chocolate make better ‘cement’ than others?
  • How strong are your chocolate structures?

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Practical science beyond Science Week


Love to Investigate

Love to Investigate is a set of 126 scientific investigations that encourage children to be curious, ask questions and explore the world around them.

Our series of practical, exciting investigations cover tricky topics in new and unusual ways, including evolution, mechanisms and air resistance. All activities come with background knowledge for teachers who haven’t taught the topic before and method boards to help children work more independently.

Find out more about Love to Investigate.


Published by

Dr Fran

Dr Fran Barnes is Cornerstones' expert in primary science. Fran is a molecular and cell biologist with a passion for hands-on, practical science in the classroom. She writes our Love to Investigate series and the science topics in our curriculum.

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