Make a lemon battery of 1.5v power
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You can make a battery with a lemon
The volcano
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you can make the volcano from the baking soda (sodium bicarbonate) and vinegar (acetic acid)
The battery of fruit
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you can make a battery from the fruit
The Secret ink
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you can make Secret ink from the Vinegar or Lemonade
Experiment of mint and soda water
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You can know effect resulting from the interaction of soda and mint
Red Cabbage Chemistry
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you can change the colors of chemical liquids with Red Cabbage Chemistry