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Chemistry Chap 7

Section 4 Determining Chemical Formulas

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
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
For an ionic compound, the formula unit is usually The compounds empirical formula.
Because of rounding or experimental error, a compound's mole ratio sometimes consist of numbers close to whole numbers instead of exact whole numbers
Empirical formula contains the smallest possible whole numbers that describe the atomic ratio
The actual formula of a molecular formula molecular formula
The relationship between a compound's empirical formula adn its molecular formula is written x(empirical formula) = molecular formula
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.
A compound composed of two different elements. Binary compound
The sum of the average atomic masses of all atoms represented in the formula of any molecule, formula unit, or ion. Formula mass
An ion formed from a single atom monatomic ion
A naming system nomenclature
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
The condition of an atom expressed by the number of electrons that the atom needs to reach its elemental form. oxidation state
a polyatomic io that contains oxygen Oxyanion
The percentage by mass of each element in a compound percentage composition
An ionic compound that forms when a metal atom or a positive radical replaces the hydrogen of an acid salt
A compound is found to contain 63.52% iron and 36.48% sulfur. Find the empirical formula FeS
Find teh empirical formula of a compound found to contain 26.56% potassium, 35.41% chromium, and the remainder oxygen. K2Cr2O7
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
Created by: tbstinso



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