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Pure vs Impure Substances

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Channing Anderson

on 30 October 2013

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Transcript of Pure vs Impure Substances

Pure vs Impure Substances
Pure Substances
A pure substance is a substance that
cannot be separated by physical
means. eg. filtration, evaporation, distillation or chromatography.
Impure Substances
A
mixture
is a combination of two or more elements or compounds that are not chemically combined.

Making a mixture requires a
physical change
.

Pure Substance Definition
A
pure substance
or chemical substance is a material that has constant composition (is homogeneous) and has
consistent properties
throughout the sample.
Examples: tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate).
Here's a short video
Pure Substances
Elements
are made up the
same types of atoms
. The known elements are listed in the Periodic table. Examples of elements include hydrogen, helium, nitrogen, oxygen, iron and gold.

Compounds
are composed of
one or more different types of atoms
that
joined together by chemical bonds
. Examples of compounds include water, glucose, methanol, DNA and carbon dioxide.


Pure Substances
Each pure substance has its own set of unique set
chemical and physical properties
which helps identifies it.
Water has a melting point of 0°C and a boiling point of 100°C. It is also colorless and odorless. Gold however, is yellow in color, solid at room temperature and pressure and is is good conductor of electricity
Pure vs Impure Substances
Impure Substances
A
mixture
can be separated using a physical change. This can include filtration, distillation, evaporation, dissolve, use of magnets, etc.
Heterogeneous Mixtures
A mixture in which components are not evenly mixed so that different parts of the mixture have different composition.
Examples
Homogeneous Mixture
is a mixture in which components are
evenly mixed
so that every part of the mixture is the same as the other
Examples
Which of these is a homogeneous mixture and which is a heterogeneous mixture?
WARM UP
Full transcript