Counting Atoms Vocabulary and Steps.

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Presentation transcript:

Counting Atoms Vocabulary and Steps

Chemical Symbol Usually a one- or two-letter set of characters that is used to identify an element. Examples: H, He, Ne, W, Li, Ag

Compound Formula A combination of symbols that shows the ratio of elements in a compound. Example: H2O (two hydrogen : one oxygen)

Subscript Shows the number of atoms of an element in a molecule or the ratio of elements in a compound. No subscript means one. Example: H2O The two is the subscript for hydrogen so there are two hydrogens Oxygen has no subscript so there is one oxygen

Coefficient or Pre-Script A number placed in front of a chemical formula in an equation. No coefficient means one. Example: 6CO2 Six is coefficient, it is used for all the elements of the compound or molecule. There are six carbons and twelve oxygens in the formula above.

Counting ‘em Up!! If there is a subscript, but no coefficient use the subscript for the element. H2O (2 hydrogen, 1 oxygen) If there is a coefficient, but no subscript use the coefficient for every element . 2AgS (2 silver, 2 sulfur) If there is a subscript and a coefficient multiply the coefficient by the subscript for each element. 12CO2 (12 carbon, 24 oxygen)