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chemistry
Ms. Crawfords class
16
Science
7th Grade
09/27/2011

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Term
Chemical symbols are a short....
Definition
way of representing elements
Term
Chemical symols consist of...(#of leters)
Definition
1 or 2
Term
Chemical symols consist of...(#of leters)
Definition
1 or 2
Term
Chemical symbols have these sort of leters
Definition
1 Capital (if need more letters in lowercase)
Term
Chemical formulae
Definition
combinations of chemical symbols
Term
Chemical formulea represent atoms that have...
Definition
bonded together to form a new substance
Term
Subscripts are placed
Definition
to the lower right of the chemical symbol
Term
Subscrip represents the number of
Definition
atoms of the element
Term
Coefficient
Definition
represents the number of molecules of the compound
Term
Example of water as a coefficient
2H2O= 2 molecules of H2O
Definition
2H2O= 2 molecules of H2O
2 X (2 hydrogen atoms and 1 oxygen atom) = 4 hydrogen atoms and 2 oxygen atoms
Term
Subscripts only refer to the symbol that they are behind (where?)
Definition
that they are behind
Term
If there is no subscript behind a symbol, then....
Definition
there is one atom of that element present
Term
Coefficients apply to the entire _____
Definition
compound
Term
You multiply the coefficients and_________ .
Definition
subscripts
Term
MgCl2
Atoms of Magnesium:
Atoms of Chlorine:
Definition
Magnesium: 1 X 1 = 1
Atoms of Chlorine: 1 X 2 = 2
Term
Al2S3
Atoms of Aluminum:
Atoms of Sulfur:
Definition
Aluminum:1 X 2 = 2
Sulfu: 1 X 3 = 3
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