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This week’s area of focus is SCIENCE, and in the spirit of spooky season, we’re making a witches’ potion! In this experiment, your child will learn about density, why some substances do not mix, and they’ll enjoy a chemical reaction right before their eyes!

You’ll need:

  • Alka seltzer tablets
  • Oil
  • A glass jar
  • Water
  • Food colouring
  • Water

First, fill your glass jar 2/3 full of oil. Next, fill the rest of your jar with water. Now it’s time to add in your food colouring, you can add a variety of colours or keep it simple with just one. You will want to put a good amount in to see the differences in density. Break up 2 Alka seltzer tablets and add them to the jar. Observe as the Alka seltzer tablets create a gas and make a bubbling reaction!

Food for thought:

Why don’t all liquids just mix together? Some liquids are heavier than others, which is why the liquids separate, making a density tower.

This experiment also includes a chemical reaction. The Alka seltzer tablets create carbon dioxide, and when it is combined with water, it bubbles. The bubbles – holding the food colouring you added – reach the top of the jar, pop, and then sink back down to the bottom.

If you try this with the children in your life, remember to share your creations with us on social media @childmuseumwpg

Source: Little Bins For Little Hands
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