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What are ELEMENTS, and how do they relate to compounds?
Describing Matter     Lesson 1.1

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Elements
  • All matter is made up of elements.
  • An element is a pure substance that cannot be broken down into any other substance.




  • Elements are the simplest substances.
  • Each element is identified by its specific physical and chemical properties.

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Atom
  • An atom is the basic particle that makes up an element.

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Chemical Bond
  • A chemical bond is the force that holds two atoms together.

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Molecules
  • Atoms often combine to form molecules, which are larger particles made of two or more atoms held together by chemical bonds.

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Compounds
  • When elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements.
A compound is a pure substance made of two or more elements chemically combined in a set ratio.


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Chemical Formula
  • A compound may be represented by a chemical formula.
  • A chemical formula shows the elements in the compound and the ratio of atoms.

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  • For example, the chemical formula for carbon dioxide is CO2.
  • In carbon dioxide, there are always two oxygen atoms for every one carbon atom
Lesson 1.1
Lab 1.1 Seperating
Quiz 1.1
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