Home chemistry 2.

Aim: To separate colours by using the process of chromatography.

Definition: Chromatography is a method of separating out materials from a mixture.

Eg. blood, ink, drugs,

Scenario

A crime has been committed. The police have a signed cheque and a letter from the same crime scene but it seems like the handwriting is different. They have 3 suspects but not enough evidence. They need to know if the letter and the cheque were written by the same person.

How do they tell if the pens used for both of these pieces of evidence are the same?

Rainbow paper

Materials;

1. Cup

2. Felt pens

3.Chromatography paper

Process:

Step 1: Get Chromatography paper and a cup

Step 2: Draw line with pencil 1cm from the edge 

Step 3: Pick two colours (preferably dark)

Step 4: add water and watch

Conclusion: What have I learnt from this experiment?

I learnt that if you add felt to Chromatography paper with water it will go up. I also learnt that the colour will change colour as it goes. My group picked two colours green and dark blue. The dark blue turned purple then went blue. Then the green went green to blue. This was a really cool experiment and I want to do it again. But maybe in other colours. Maybe with lighter colours and see what happens.

Skittles

Aim: To separate colours from skittles by using the chromatography.

Materials;

1. skittles
2. petri dish
3. water


Process:

Step 1: get a petri dish
Step 2: get skittles 
Step 3: put skittles in petri dish
Step 4: add water to petri dish and watch.

Conclusion: What have I learnt from this experiment?
That if you add water to skittles it will get the colours out of it. The skittles loses its colour and goes white. I learnt that skittles taste disgusting if they are wet. Also, the water is disgusting. It was really fun. I would want to do this again cause of the skittles.