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    Home » Holiday Science » Halloween Science » Halloween Density Jar

    Halloween Density Jar

    October 21, 2015 By Emma Vanstone Leave a Comment

    This is a super simple, fun Halloween density investigation, perfect for introducing the concept of liquids having different densities and for practising making and testing predictions. All you need to do is set up an easy density jar and try to find a spooky object for each layer.

    Halloween Density Jar

    Spooky Halloween Density Jar - glass jar half filled with oil and water

    What you need

    Empty bottle or jar

    Water

    Oil – we used very cheap vegetable oil.

    Halloween objects to test – we used plastic spiders, eyeball bouncy balls and decorative foil ghosts

    Method

    Half fill your container with water, then add some oil. What do you notice?

    Carefully drop your objects into the jar, what happens? Can you find something to float on each layer?

    Were your predictions correct?

    See this post for a full explanation about density.

    Why do oil and water not mix?

    This is because water is a polar molecule – its structure means that it has a positive charge one end and a negative charge at the other. Water molecules stick together because the positive end of one water molecule is attracted to the negative end of another water molecule.

    An oil molecule has a different structure, it is non polar meaning that its charge is evenly spread out, so oil molecules are not attracted to water molecules. Oil is hydrophobic and tries to get as far away from water as possible.

    If you liked this activity we’ve got lots more Halloween Science and Halloween STEM Challenges you might like!

    Image of a a jar with oil and water to demonstrate density. It's halloween themed as there are plastic spiders on each layer

    Last Updated on September 30, 2022 by Emma Vanstone

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    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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