A.  Solid / Solid Mixture

Mix a teaspoon of sand and a teaspoon of salt in a watchglass. Observe using a microscope.

1. Take a picture of the mixture. Done.
2. Can you see separate grains of salt and sand? Yes you could see separate grains of salt and sand.
3. How could you separate this mixture? Move them one by one.

B.  Solid / Liquid Mixture

Mix half a spatula full of flour in a test tube of water. Shake it, then leave it to stand.

1. Are particles of flour visible in the water? Yes particles of flour visible in the water.
2. Describe what you observed. I saw a dusty cloud of water.
3. What type of mixture is this? Suspension.

C.  Liquid / Liquid Mixture

Add a few drops of oil to half a test tube of water. Observe. Shake the test tube and leave it to stand for 2 minutes. Observe. Now add a few drops of detergent to the test tube, the shake and observe.

1. What did you observe at the start? All of the oil was on top.
2. After standing, were the oil and water mixed? Is this mixture an emulsion? Yes it is a emulsion.
3. What did you observe after you added the detergent? Some of the oil mixed with the water.
4. After standing, were the oil and water mixed now? Is this mixture an emulsion? No this mixture is not a emulsion.
5. How do you think detergents work to clean our dishes? They make things mix with the water and to help clean dishes