The document describes an experiment to make mixtures of solids and liquids. Students are instructed to half-fill test tubes with water and add pinches of various solids (salt, oil, sugar, copper sulfate). They observe whether each solid "disappears" or dissolves in the water. The conclusion discusses the definitions of solutions, solutes, and solvents. When a solid dissolves in a liquid, it is the solute and the liquid is the solvent, forming a solution. An undissolved mixture is a suspension.

1. Making mixtures of solids and liquids
Aim: To make mixtures of solids and liquids
Equipment: 4 test tubes, test tube rack, salt, oil, sugar, copper sulfate
Method:
1. Collect all equipment.
2. For the first test tube, half fill the test tube with water and add a pinch of salt. Put your
thumb over the opening of the test tube and shake it to thoroughly mix the salt in the
water.
3. Did the salt ‘disappear’ into the water? Record the results in the table below.
4. Repeat steps 2 and 3 for the rest of the test tubes and substances.
5. Clean up and put your equipment away.
Results:
Substance Did it ‘disappear’ in water?
salt
oil
sugar
copper sulfate
Conclusion:
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………

2. Solutions, solutes and solvents
When a solid ‘disappears’ into a liquid, we say the solid has dissolved into the liquid.
The solid that does the ‘disappearing’ is called the solute and the liquid is called the
solvent. A mixture of a solute and a solvent is called a solution.
If the solid doesn’t dissolve into the liquid, the mixture is called a suspension.
Here is your results table again. This time you need to identify the solute and the solvent.
Substance Did it dissolve What is the What is the Is this mixture
in water? solute? solvent? a solution or a
suspension?
salt
flour
copper sulfate
sand
sugar
Complete these sentences
When a solid ‘disappears’ into a liquid, the solid has ……………………
When a solid dissolves into a liquid the mixture is called a …………………………………
When a solid doesn’t dissolve into a liquid the mixture is called a …………………………
In a solution, the solid that has dissolved is called the …………………………..
In a solution, the liquid that dissolves the solid is called the …………………………