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This weeks theme is Food Science.
2 copper wires
2 galvanised nails
3 alligator clips
Stick copper wire in each lemon
Stick galvanised nail in each lemon
Connect each lemon with an alligator clip
Copper to nail
Join alligator clip to calculator
How’s it work?
Lemon batteries work use the electrodes of the two metals stick into the lemon. Copper and the zinc from the galvanised nail. Magnesium atoms at the negative electrode are converted to magnesium ions, leaving electrons behind. The electrons flow through the wires toward the positive copper electrodes, making the calculator work. Electrons combine with hydrogen ions at the copper electrode, producing hydrogen. You may have seen this experiment using a light bulb. Source @littleproblemsolvers
We had trouble producing enough voltage to power a bulb. So a calculator which uses less volts than a light bulb worked best.
Milk Marbling Experiment
Poor milk into bowl
Add food colouring
Add dish soap
Colours disperse like fire works
When liquid dish soap is added to milk with drops of food coloring on the surface, the soap reduces the surface tension of the milk and reacts with the fat. This interaction causes the fat particles in the milk to move and create swirls of color.
Red Cabbage experiment.
Boil red cabbage in water for 15 mins
Let cool and remove cabbage leaves using a sieve.
Eye drop red cabbage into different solutions.
We used bleach, baking powder, water, sugar water, vinegar and lemon juice.
Why do the change colour?
Red cabbage acts as a pH tester.
What is pH?
pH tells us if something is an acid or a base. pH is measured on a scale of 0-14. Low numbers are acids, high numbers are base. Water is neutral and is 7 on the pH scale. The cabbage acts asan indicator. When in contact with a acid or base the colour changes. Red when in contact with acids and green when in contact with a base.
Gather marshmallows and toothpicks
Allow imagination and unstructured play to build.
See what shapes they can build.
Discover & introduce terms such as balance, strength, integrity, structure and fr