Simply Science: Colourful Experiments!

By Shani Asokan | Published: 2:00 AM Jan 2 2021
Scribbler Simply Science: Colourful Experiments!

By Shani Asokan

Ceylon Today Features

Science doesn’t have to be difficult. It can be simple, fun and a great stay at home activity! Here are some simple experiments you can do with a few materials you have lying around the house.  While these experiments are safe to do at home, we recommend getting an adult to help you. Besides, this is fun for the whole family. Get ready to see science in action!


Rainbow in a glass

Learn about density and create your very own rainbow in a glass. 

What you will need

- Food colouring, a few different colours

- Sugar

- Water

- Bowls

- A tall glass

How it works

 when you add sugar to a liquid, the mixture becomes more dense. The more sugar you add, the more dense it gets. So this means you can create liquids of different densities, just by adding more or less sugar to each one.

Create you rainbow

Pour equal amounts of water into separate bowls, add a few drops of food colouring into each bowl. Now that you have your individual colours, add different amounts of sugar to each one. Remember, the colours you want to have at the bottom of the glass get the most sugar. 

Gently pour each colour into the glass, the most dense liquid first. Remember, this means the liquid with the most sugar goes into the glass first! Once you’ve poured all of the colours in, sit back and enjoy your rainbow in a glass.

Lesson

The more sugary solutions sink to the bottom of the glass because they have a high density. The solutions with less sugar sit on the top because they have a lesser density.


Ooey-gooey slime

Learn how some ingredients bind together to create this stretchy, slimey bit of fun! 

What you will need

- ½ cup clear or white glue

- 1 cup water, divided

- Food Colouring

- ¼ teaspoon Borax 

- A bowl

How it works

When you mix glue, water and a little bit of borax together, they form a gooey slime. This is because the glue has something called ‘polyvinyl acetate’ in it, which is a liquid polymer. Polyvinyl acetate is made up of molecules which link together when mixed with borax, creating that stretchy, flexible slime we all love.

Create your slime

Mix the glue together with half of the water, once it is combined, add a few drops of food colouring. Mix the borax with the remaining water until completely dissolved and then add it to your glue and water solution. Stir. You will start to see clumps form right away. Remove from the bowl and knead with your fingers for a few minutes until the slime gets nice and stretchy. There may be some solution left over in the bowl, which is normal.

Lesson

The right ingredients mixed together can transform something from a liquid to a solid. In this case, the glue goes from being a liquid like substance into a stretchy solid. That is, from liquid polymer to polymer.

 

By Shani Asokan | Published: 2:00 AM Jan 2 2021

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