1. Mixtures and Solutions
COS #4: Students will investigate properties of solutions and will provide evidence for whether mixtures can be separated base on the properties of their parts.

2. Mixture A physical combination of 2 or more substances
Not a pure substance
Heterogeneous
Materials are distributed unevenly
Individual pieces are present in some parts and not in others
Homogeneous
Uniform throughout, a sample from one part of the mixture is identical to another sample

3. Separating a Mixture
Each substance in a mixture retains it’s original properties
Mixtures can be separated according to their properties (i.e. size, shape, buoyancy, color etc.)
Cork/marbles – to separate pour in water, the corks will float and the marbles will sink.
Sand/seashells – to separate use a screen over the opening of a container, the sand will fall through while the seashells will stay on top.
Variable composition
Two similar mixtures may be made up of the same substances, but different amounts of each substance
Compound
Always have the same composition

4. Solutions
A homogeneous mixture, two or more substances that are evenly distributed
Pink lemonade from a powder
Solute = the substance being dissolved (sugar)
Solvent = the substance that dissolve the solute (water)
Even if you cannot see the different part of a solutions they each still retain their properties
In a solution particles spread evenly throughout the solution because they mix on an atomic level

5. To separate a solution use the substance’s properties
Evaporation
Boiling/melting points
Notebook Voc

6. Alloys A mixture of 2 or more metals
A mixture of or metal or other solid material
Alloys retain a combination of properties of the materials that form them
Bronze = Copper and tin
Durable and malleable ( thin sheets)
Used to make tools, weapons and sculptures
The amount of each material can affect the properties
Steel = iron, carbon and sometimes other materials
Soft – less carbon (nails and chains)
Hard – more carbon (tools and support beams)