Mixtures and Concentrations
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What are mixtures?
A combination of molecules that are physically blended but not chemically bonded.
What are colloids?
Where particles between 2-500nm are suspended in a medium. They are often opaque, the suspended molecules do not settle so this can be thought of as a "better suspension."
What are suspensions?
Where large molecules (>500nm) are blending within a medium but not as steadily as in solutions or colloids. The heavier particles will eventually settle.
What is a solution?
Where molecules in the medium are distributed evenly. That is, the solute is distributed evenly throughout a solvent.
How does water act as a solvent?
The polarisation of the water molecules means that they are able to interact with other charged (hydrophilic) molecules, distributing them evenly and keeping them suspended.
What does the term concentration refer to?
- The amount of solute present in a solvent.
- -mL / L
- - %
- - M
What is the definition of molarity?
The number of Ms of solvent dissolved in 1L of solute.
What is atomic weight and what is molecular weight?
Atomic weight: The amount of grams 1M of a molecule will make.
Molecular weight: The sum of all the atomic weights of elements in that molecule combined.
How do you calculate the molarity of a solution?
- Determine how many Ms of solute are in 1L of that solution. Eg.
- 1M in 1L = 1M solution
- 2M in 1L = 2M solution
- 1M in 2L = 0.5M solution
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