Outdoors, demonstrate the ‘blasting' chemical reaction between bicarbonate of soda and vinegar.
- Zip-lock sandwich bags (use good quality bags)
- Bicarbonate of soda
- Squares of tissue
- Lay a square of tissue on a surface.
- Put two spoonfuls of bicarbonate of soda in the centre of the tissue.
- Fold the edges of the tissue and twist the top gently to create a little parcel.
- Fill the cup with vinegar and pour into the zip-lock bag.
- Drop the parcel of bicarbonate of soda into the zip-lock bag and quickly seal the bag.
- Put it on the floor then stand well back.
- Observe what happens and get ready for a ‘bang!’
Vinegar (acetic acid) and bicarbonate of soda (sodium bicarbonate) react to produce bubbles of carbon dioxide gas. When the reaction is sealed inside a zip-lock bag it fills with the gas until it explodes.
- What would happen if you changed the amounts of vinegar or bicarbonate of soda?
- Would it work with different liquids such as water or milk?
- Does the material used to make the parcel make a difference to the reaction?
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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.
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