mixtures unit 1: measurement & matter. 2 categories of matter pure substances mixtures
TRANSCRIPT
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