mixtures pure substances and...mixtures are formed by combining two or more pure substances together...
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PURE SUBSTANCES AND MIXTURES
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QUICK REVIEW
• An element is a substance made up of atoms of one kind.
• A molecule is formed when atoms of the same elements combine.• Two atoms of oxygen combine to form a molecule of oxygen [O
2]
• A compound is formed when atoms or molecules of different elements combine chemically.• Hydrogen and oxygen are combined in a fixed proportion of 2:1 to
form the compound water [H2O].
• Mixtures are two or more substances that are mixed together but not chemically joined.
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PURE SUBSTANCE VS. MIXTURE
A pure substance: • made up of 1 type of particle
• ELEMENT= made of 1 type of atomExamples?????
• COMPOUND= made of 1 type of moleculeExamples?????
• cannot be separated into 2 or more substances by physical means
• has uniform composition throughout the whole sample
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A mixture: Mixtures are formed by combining two or more pure
substances together without them undergoing a chemical
change.
Therefore, there are two or more substances in the same
space or container.
• can be separated into 2 or more substances by physical or mechanical means
• displays the characteristic properties of the pure substances making it up
• its composition can be varied by changing the proportion of pure substances making it up
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Mixtures are different from pure substances
because they contain at least two different
types of particles instead of just one.
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There are two different types of mixtures....
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When a mixture’s components are easily
recognizable from one another it is called a
HETEROGENEOUS MIXTURE.
You can see different particles. The particles
are not evenly distributed.
Examples: ???
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In a HOMOGENEOUS MIXTURE, the parts all look
the same, even though the substances inside still
retain their original properties.
Also known as a solution.
All parts of the mixture look the same. Particles are
evenly distributed.
Examples???
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Type of Mixture
Example
gas in gasThe atmosphere is a mixture of gases, mostly nitrogen and oxygen.
liquid in liquid Wine is a mixture of mostly ethanol and water.
solid in solidAlloys, such as brass, are made up of a mixture of metals.
gas in liquidSoft drinks, such as cola, are mixtures of mainly carbon dioxide gas and water.
solid in liquid Sea Water is a mixture of salts dissolved in water.
solid in gasSmoke is mixture of tiny solid particles in atmospheric gases.