Section 4 Determining Chemical Formulas
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| A chemical formua that shows the composition of a compound in terms of the relative numbers and kinds of atoms in the simplest ratio | Empirical Formula
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| An empirical formula consists of the | Symbols for the elements combined, with subscripts showing the smallest whole-number mole ratio of teh diferent atoms in the compound
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| For an ionic compound, the formula unit is usually | The compounds empirical formula.
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| Because of rounding or experimental error, a compound's mole ratio sometimes consist of | numbers close to whole numbers instead of exact whole numbers
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| Empirical formula contains the smallest possible whole numbers that describe the | atomic ratio
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| The actual formula of a molecular formula | molecular formula
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| The relationship between a compound's empirical formula adn its molecular formula is written | x(empirical formula) = molecular formula
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| In the molecular formula, the x represents | a whole-number multiple indicating teh factor by which the subscripts in teh empirical formula must be multiplied to obtain teh molecular formula.
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| A compound composed of two different elements. | Binary compound
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| The sum of the average atomic masses of all atoms represented in the formula of any molecule, formula unit, or ion. | Formula mass
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| An ion formed from a single atom | monatomic ion
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| A naming system | nomenclature
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| The number of electrons that must be added to or removed from an atom in a combined state to convert the atom into the elemental form. | oxidation number
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| The condition of an atom expressed by the number of electrons that the atom needs to reach its elemental form. | oxidation state
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| a polyatomic io that contains oxygen | Oxyanion
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| The percentage by mass of each element in a compound | percentage composition
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| An ionic compound that forms when a metal atom or a positive radical replaces the hydrogen of an acid | salt
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| A compound is found to contain 63.52% iron and 36.48% sulfur. Find the empirical formula | FeS
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| Find teh empirical formula of a compound found to contain 26.56% potassium, 35.41% chromium, and the remainder oxygen. | K2Cr2O7
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| Analysis of 20.0 g of a compound containing only calcium and bromine indicates that 4.00 g of calcium are present. What is the empirical formula of the compound formed | CaBr2
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