Date post: | 04-Jan-2016 |
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Pure SubstancesComposition is the same throughout
and does not vary from sample to sample.
CANNOT be broken down by physical changes
Can be an element or
compound.
Mixture2+ pure substances that are
mixed together but NOT joined chemicallyExamples: The air we breath, gasoline for cars, the sidewalk on which we walk
A mixture of 1 element and 1 compound
A mixture of one element and one compound, e.g. hydrogen (H2) and ammonia (NH3)
A mixture of 2 compounds
A mixture of two compounds, e.g. water vapour (H2O) and carbon dioxide (CO2)
Homogeneous MixturesUniform in composition and
appearance
Same proportion of components throughout
Consists 2+ substances in the same phase
Also called solutions
You Decide!Look at the following examples and with your partner determine if it is a heterogeneous mixture, homogeneous mixture, or a pure substance
Review: Mixtures Two or more ________________ or _________________
NOT chemically combined. No reaction between substances. Mixtures can be uniform (called
________________________) and are known as solutions.
Mixtures can also be non-uniform (called ________________________).
• Mixtures can be separated into their components by ________________ or ________________ means.
• The properties of a mixture are similar to the properties of its ________________ .
elementscompound
s
homogeneous
heterogeneous
chemicalphysical
components