PPT: Properties of Materials | Year 8 Chemistry (Cambridge) PDF Download

 Page 1


Properties of 
Materials
Page 2


Properties of 
Materials
Dissolving
What is a solution?
A mixture formed when a solute dissolves in a solvent. The 
particles of the solute spread out among the solvent 
particles.
Solute
The substance that dissolves (e.g., sugar).
Solvent
The substance that the solute dissolves into (e.g., water).
Page 3


Properties of 
Materials
Dissolving
What is a solution?
A mixture formed when a solute dissolves in a solvent. The 
particles of the solute spread out among the solvent 
particles.
Solute
The substance that dissolves (e.g., sugar).
Solvent
The substance that the solute dissolves into (e.g., water).
Dissolving
When you place a lump of sugar in water, the sugar seems gradually to disappear. The sugar is dissolving. 
You are left with a colourless solution. Although the sugar seems to disappear, it is still there. The sugar 
particles have simply spread out among the water particles.
Page 4


Properties of 
Materials
Dissolving
What is a solution?
A mixture formed when a solute dissolves in a solvent. The 
particles of the solute spread out among the solvent 
particles.
Solute
The substance that dissolves (e.g., sugar).
Solvent
The substance that the solute dissolves into (e.g., water).
Dissolving
When you place a lump of sugar in water, the sugar seems gradually to disappear. The sugar is dissolving. 
You are left with a colourless solution. Although the sugar seems to disappear, it is still there. The sugar 
particles have simply spread out among the water particles.
Properties of Solutions
Transparent Vs. Opaque Solutions
All solutions are t r a n s p a r e n t, 
meaning you can see through them. 
For example, copper sulfate solution 
is blue but still transparent.
A liquid like milk is o p a q u e (you 
cannot see through it), indicating it's 
not a solution.
Page 5


Properties of 
Materials
Dissolving
What is a solution?
A mixture formed when a solute dissolves in a solvent. The 
particles of the solute spread out among the solvent 
particles.
Solute
The substance that dissolves (e.g., sugar).
Solvent
The substance that the solute dissolves into (e.g., water).
Dissolving
When you place a lump of sugar in water, the sugar seems gradually to disappear. The sugar is dissolving. 
You are left with a colourless solution. Although the sugar seems to disappear, it is still there. The sugar 
particles have simply spread out among the water particles.
Properties of Solutions
Transparent Vs. Opaque Solutions
All solutions are t r a n s p a r e n t, 
meaning you can see through them. 
For example, copper sulfate solution 
is blue but still transparent.
A liquid like milk is o p a q u e (you 
cannot see through it), indicating it's 
not a solution.
Properties of Solutions
Dissolving vs Melting
It's easy to confuse melting with dissolving, but 
they are different processes:
Dissolving needs two substances: a solute 
and a solvent
Melting involves just one substance changing 
from solid to liquid