What you'll need:
•Small soft drink bottle
•2 tablespoons of cooking oil
•Dish washing liquid or detergent
Explain to Children about liquids and what they are and how each liquid had a different density just the same as the solid that it comes from.
Half fill water bottles with water and get beavers to make notes on what they see.
Ask children what they think will happen to the water if they add food colouring to it. Add a teaspoon of food colouring.
Ask children what they think will happen to the water if they add oil? Add two table spoons of oil and get children the shake the bottle(with lid on).
Place bottle on table and ask children to watch what happens.
Get children to explain what they see and why this might happen?
Ask children what they think will happen if they add washing up liquid to the bottle?
While water often mixes with other liquids to form solutions, oil and water does not. Water molecules are strongly attracted to each other, this is the same for oil, because they are more attracted to their own molecules they just don't mix together. They separate and the oil floats above the water because it has a lower density.
Add washing up liquid to bottle and shake bottle(lid on).
Place bottle on table and watch what happens.
Get children to explain what they see and why.
Talk about density of liquids again and how the density of a liquid can be changed by using other liquids the bind the liquids together the end product is called an Emulsion