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Mixtures and Solutions

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by

Douglas Stretch

on 5 January 2016

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Transcript of Mixtures and Solutions

Mixtures and Solutions
Pure Substances
Cannot be separated physically
Properties do not vary
Fixed composition
Simplest form of matter composed of one type of atom
Composed of one type of molecule consisting of a combination of atoms
Mixtures not uniform in composition and properties throughout (Mechanical mixtures)
Having uniform properties and composition throughout (also calles a solution)
Mixtures
Retain their individual identities
Matter that consists of two or more pure substances
Can be separated using physical methods.
Appears to be one substance
Two or more parts can be seen
Pure Substances - Elements and compounds
Matter having invariant chemical compositions and distinct properties
Colour
Hardness
Odour
Can exist in all three phases
Mixtures: Homogenous and Heterogenous
Can be formed from two or more different pure substances.
Properties of one substance may be hidden but not lost.
Types of Hetergenous Mixtures
Particles settle slowly after mixing
Large particles can be trapped by most fine filters
Particles small enough to pass through most filters

Suspensions
Colloids
Emulsion
Ex. OJ with pulp
Particles do not settle
Ex. Milk, fog
A protein that prevents tiny droplets of fat from joining
Ex. Mayonnaise
Homogenous Mixtures
Solutions
Dissolving
- Forming a solution by mixing two or more substances together
Because particles are always moving, water particles attract the sugar particles more strongly, Water pulls sugar particle away and motion of the water carries it away, making room for more water particles
Keeps going until sugar is dissolved

Water dissolves and carries particles in your blood system like salt.
Rate of Dissolve
What are the factors that effect the rate at which something will dissolve?
Full transcript