Counting Atoms review

Counting Atoms

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A chemical formula represents a ​

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and uses ​

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to show the number of atoms of each ​

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Elements are represented by either​

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or ​

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letter symbols. The first letter of an element is always ​

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a letter and the second letter will be​

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The ​

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tells you the number of atoms of a particular ​

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and only refers to the element that it is ​

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. If there is no subscript, there is only ​

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atom of that element.

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​ A ​

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is a number that is placed in

​

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of a chemical formula. You must ​

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the coefficient by the ​

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to find out the number of atoms of each element.

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​

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the subscript that is​

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the parenthesis by the number of atoms that are ​

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the parenthesis.​

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Lithium​

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Sulfur ​

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​ oxygen ​

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Barium ​

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​ Chlorine ​

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Silver (Ag)​

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Nitrogen (N) ​ 4

​ oxygen ​ ​

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Draw

Write in the numbers of each atom

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Write in the numbers of each atom

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Write in the numbers of each atom

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How confident do you feel about balancing chemical equation?

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What are Chemical Equations

Labelling

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products

Reactants

yield or produces

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Fill in the coefficient

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Balance the equation

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Balance the equation

Poll

How confident do you feel about counting atoms?

• ready for the test

• I still need more help

• I don't understand at all