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Science experiments

Lava lamp experiment 

Here is a fun experiment for all of the family. Make sure you ask an adult for their help.

Things you will need:

  • A clean plastic bottle, try to use one with smooth sides
  • water
  • Vegetable Oil (or you could use Mineral or Baby Oil instead)
  • Fizzing tablets (such as Alka Seltzer/Aspirin)
  • Food Colouring

Instructions:

  1. Fill the bottle up about 1/4 with water.
  2. Pour the vegetable oil in the bottle until is almost full. You may want to use a measuring cup with a spout or a funnel. You may have to wait a couple of minutes for the oil and water to separate.
  3. Add a few drops of your favourite food colouring. Watch as the colour sinks through the oil. Did your drops of colour mix with the water immediately or float in between for a few minutes?
  4. Break your fizzy tablet in half and drop part of it into the bottle. Get ready … here come the bubbly blobs!
  5. You can even get a torch, turn off the lights and drop in another half tablet. This time shine the torch through the lava lamp while the blobs are bubbling!

 

How it Works:

The oil floats on top of the water because it is less dense or lighter than water. The food colouring has the same density as the water so it sink through the oil and mixes with the water. When you add the tablet it sinks to the bottom then starts to dissolve. As it dissolves it makes gas, carbon dioxide. Gas or air, is lighter than water so it floats to the top. The air bubbles bring some coloured water with them to the top. When the air comes out of the coloured water blob, the water gets heavy again and sinks. It does this over and over again until the tablet is completely dissolved.

 

Extra Experiments:

What happens if you put the cap on after dropping the fizzy tablet in?
What if you drop a whole tablet in?
When it stops bubbling, try sprinkling some salt into your lava lamp. What happens?

 

Lava Lamp experiment by Mrs Samuels

Still image for this video

Invertebrate hotel

This is a nice thing to do for your the insects and creatures in your garden.

It doesn't have to grand but you must ensure you observe what is currently in outdoor space. Think about the habitats of the creatures you want to invite to your 'hotel' and provide organic material that they will like. If you don't have an outdoor space of your own, you could build mini structures on your daily exercise route.

This is one of our favourite ones!

https://supersimple.com/article/bug-hotel/

 

 

Dancing dude!

This is a really simple fun activity to try.

All you need is:

  • A white plate, bowl
  • A whiteboard pen
  • Water

Instructions

  1. Draw a simple picture on the glass. A stick figure is a good one to start with
  2. Pour water onto the plate or into the bowl slowly to lift up the drawing
  3. Swirl the water around to make the picture dance and move

 

How does it work?

The marker leaves behind mixture of pigments and a type of alcohol mixed together. The alcohol dissolves and the pigments are left behind as a solid. The plate is so smooth that the solid slides right off when it gets wet!

Mrs Samuels' Dancing dude

Still image for this video

Milk Art

Materials

  • A bowl
  • Milk
  • Dish soap
  • Cotton swab
  • Food Colouring, more than one colour
  • Pepper (optional)

Instructions:

1. Pour the milk into the bowl. Be careful not to move the bowl, you want the milk as still as possible.
2. Put one drop of each colour in different places in the milk.
3. Put just a tiny amount of soap on the end of the cotton swab, then touch it to one of the colours. WOW!
4. Let the experimenting begin!
5. To clean up, just pour the milk down the drain. (Do not drink it)

How it Works:

Milk has fat in it and the food colouring floats on top of the fat. The fat is all connected with bonds. Think of it like the little pieces of fat all holding hands with each other. Dish soaps are used on greasy or oily dishes because it breaks the bonds in fats allowing them to separate. When you add the dish soap to the milk, the fat separates and moves making your magical milk art!

Extra Experiments:

Does the temperature of the milk have any effect?
Try whole milk and skim milk.
Sprinkle pepper on the milk before you add the soap, what happens to the pepper?

Mrs Samuels' Milk Art - hope yours is more successful than mine!

Still image for this video
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