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Chemistry / Mātai matū

Topics covered:

  • Periodic table

  • Common elements (oxygen, carbon)

  • pH

Hands-on components:

  • Use pH indicator strips to test liquids such as milk, water, washing powder, vinegar

  • Magic noodles (using red cabbage juice)

  • Crack the code using the periodic table

  • thermochromic paint (colour change with heat)

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Magic noodles: red cabbage juice as a pH indicator

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Here are the sticks showing the colour change at 25°C (orange) and 35°C (yellow).

For repeat customers:

​There are a couple of pH themes: students can investigate

  • the pH of household detergents (body wash, bar soap, washing liquid & powder). Our skin has a pH of 5.5. How does this compare to the detergents we use on our skin?

  • the pH of beverages (Kombucha, energy drinks, fruit tea, carbonated water). Acidic drinks are not good for our teeth. Which drinks should we be choosing to drink?

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