Tuesday, June 28, 2011

How to make a disco of colurs

Do you know how to make a rainbow of colurs.first you need a bowl or a dish.next you pour in the milk half way up the bowl or dish until it is okay to stop . then you put in blue green and red food coluring . next you get some dish wahing liquid then pour it in with the cotton bug till it touchs the middle of the bowl right on the coluring

Sunday, June 26, 2011

Solids, Liquids, Gases Activity

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Diet Coke and Mentos Geyser

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Today, we tried to make a Diet Coke and Mentos Geyser! It didn't work as well as we hoped so we are going to modify the experiment to try and get more height on our Geyser. Watch this space.

How this happens:
Soda drinks are pumped full of carbon dioxide at the drink factory to make them fizzy. It doesn't get released from the liquid until you pour it into a glass and drink it, some also gets released when you open the lid (more if you shake it up beforehand). This means that there is a whole lot of carbon dioxide gas just waiting to escape the liquid in the form of bubbles.

Dropping something into the Diet Coke speeds up this process by both breaking the surface tension of the liquid and also allowing bubbles to form on the surface area of the Mentos. Mentos candy pieces are covered in tiny dimples (a bit like a golf ball), which dramatically increases the surface area and allows a huge amount of bubbles to form.


Milk Experiment




Last week, Room 12 did an experiment using milk, food colouring and dishwashing liquid. Some children have written explanations about it.


The Milk Explosion Experiment !!! - Melvina

How to do the 'Milk Explosion Experiment'

Firstly, you need ingredients and those ingredients are: milk, food colouring, ( red ,blue, yellow and green), bowl, dish washing liquid and a cotton bud. The food colouring you choose are optional but only four colours. Next, you put the food colouring but you need to put them seperately or the experiment won't work. Then, you get your cotton bud and with one side put dish washing liquid on to it and then carefully put the cotton bud in to the middle and watch what happens.

It all mixes together and twirls around. This happens because of the milks fat and protein. They keep bumping together to find molecules. Scientists have an example of telling about fats and proteins, so you can get the idea of what they are trying to say. Scientists say, that when are at a disco you find a new friend to dance with, so that is what happens to the molecules. The fat and protein molecules are dancing around. This is a physical change because it can not change back to how it was before.

Thats how we make Swirling Milk.

Burst of colours

How do you make milk colourful?

Firstly,you get a bowl or a dish and put in some milk about halfway. Next, you add some food colouring green,blue,yellow,and red. Only put one drop of each colour. After that,you put dish washing liquid into the bowl and watch it burst out with colours.

What is happening is a physical change because it is still milk and it is still food colouring even though they are moving around. Milk has fat and protien. When the fat and protien bump together they find molecules.

You might even want to try this fun science experiment at home. Give it a try. You can tell your friends, auntys, cousins and uncles. Watch the teriffic, magnifient sight inside the bowl. 'What a delightful thing you have made' thats what your Mum or Dad might say.