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Elements, Compounds, & Mixtures

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by

Kerry Tallon

on 23 April 2014

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Transcript of Elements, Compounds, & Mixtures

Elements, Compounds, & Mixtures
Elements
A pure that cannot be separated into simpler substance by physical or substance chemical means.

Compounds
A pure substance composed of two or more different elements joined by chemical bonds.

Made of elements in a specific ratio that is always the same
Has a chemical formula
Can only be separated by chemical means, not physically

Mixtures
A combination of two or more pure substances that are NOT chemically combined.
Substances held together by physical forces, not chemical
No chemical change takes place
Each item retains its properties in the mixture
They can be separated physically

Matter can be classified in many ways. One way to classify matter is to identify the parts that make it up. In this Prezi you will learn about one method of matter classification: identifying elements, compounds, and mixtures.
Atoms are all the same particles
Molecules are atoms bonded together chemically
(they can be the same atom or different atoms.)
Compounds are different atoms that are chemically
bonded in specific ratios
Mixtures are atoms or compounds that are
combined PHYSICALLY. They can also be separated physically.
Atoms Compounds Mixtures
Composition
Joined or not
Properties
Separation
Examples
Definite composition;
individual particles
Definite composition; cannot vary the amount of each element
Variable composition - the amount of each substance can be different
Not joined - individual particles
Different elements are chemically joined
Not joined chemically
Keeps own properties
Compounds have different properties from the elements that make them up
Each substance keeps its
own properties
Not easy - separation would change the properties of the atom (ions, isotopes)
Can only be separated by chemical reactions
Each substance can easily be separated by physical means
Hydrogen, Lithium, Carbon
Water, Carbon dioxide, Sodium chloride
Air, Sea water, Dirt
Types of Mixtures
Mixtures can be further classified by how the particles that make them up interact.
Solution:
Suspension:
Colloid:
A mixture that appears to be a single substance. It is composed of particles of two of substances that are distributed evenly among each other. Ex: tap water, gasoline, metal alloys
A mixture in which particles of a material are dispersed throughout a liquid or gas but are large enough that they settle out. (The particles are larger than in a solution.) Ex: Pieces of snow in a snow globe.
A mixture in which the particles are dispersed throughout but are not heavy enough to settle out. (Colloids are in between solutions and suspensions) Ex: milk, mayo, whipped cream, Jell-O
Methods to Separate Mixtures
Mixtures can be separated by PHYSICAL means. Meaning, picking out parts of it, using a magnet to separate the parts, or filtering the mixture are all ways to separate the components.
Centrifuge
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