Hokey Pokey

On Monday afternoon, we started our Science investigation for the term - Temporary and Permanent Changes. We firstly looked at Chemical reactions, and what can make them. We looked at the 'fizz inflater' video on the Year 3-4 Science wiki...



... which showed that an acid (vinegar) and a carbonate (baking soda) can make a gas (carbon dioxide, Co2) if mixed.

Can we make Co2 in other situations?

We made Hokey Pokey to find out. We heated Golden Syrup in a flask until it bubbled. We then mixed in baking soda and stirred as the mixture frothed up. The frothing was the baking soda releasing all of it's carbon dioxide gas.

Due to popular demand, below is a Hokey Pokey recipe much better than the one we used on Monday!

Ingredients

5 Tbsp Chelsea White Sugar
2 Tbsp Chelsea Golden Syrup
1 tsp baking soda

Method

Put Sugar and golden syrup into a saucepan. Heat gently, stirring constantly until Chelsea Sugar dissolves. Increase the heat and bring to the boil. Boil for two minutes. Stir occasionally, if necessary, to prevent burning. Remove from heat. Add baking soda. Stir quickly until mixture froths up. Pour into a buttered tin immediately. Leave until cold and hard. Break into pieces.



Special thanks to Edmonds for use of this recipe.