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Chemical Formula
Principles
Chemical Formula is a system of chemical notation that was invented in 181 by John Jakob Berzelius. The system is based on the law of definite proportions”, states that all samples of a given chemical compound have the same elemental composition.
It is also a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, and plus (+) and minus (−) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a chemical name, and it contains no words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Chemical formulas are more limiting than chemical names and structural formulas.
Definition of terms
Formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a formula by the number of atoms of that element present in the formula, and then adding all of these products together.
Molecular Formula is a formula used in computing the formula weight
Molecular weight is formula weight computed.
Binary Compounds are the simplest chemical formula and compounds made up of two elements. Binary compounds have a positive half that is written first and negative half is written second.
Subscripts are small numbers to the lower right of a symbol. They the number of atoms of that element in the compound.
Coefficients are large numbers to the left of formulas in chemical equations. They represent the ratio of molecules of each substance involved in a chemical reaction.
Weight Percentage is a percentage based on weights.
Mole percentage is a percentage based on the numbers of atoms or moles.
Formula units is the simplest form of an ionic compound



References: 1. http://bowvalleycollege.ca/Documents/Learning%20Resource%20Services/Library%20Learning%20Commons/E-Resources/Study%20guides%202/chemistry%20rules_for_naming.pdf 2. http://www.emsb.qc.ca/laurenhill/science/name.html Balancing of Chemical Equations

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