Counting Atoms Slides PDF
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Summary
This document provides a concise guide on counting atoms in chemical formulas. It explains the concept of coefficients and subscripts in the formulas of different chemical compounds, using different examples. A visual is included to represent the molecule itself.
Full Transcript
COUNT ATOM How to count atoms 2H2O COEFFICIENT SUBSCRIPT 2H2O The coefficient gets applied to the ENTIRE formula -this means that there are 2 molecules of water present! -you MULTIPLY this number by every subscript in the formula 2H2O 2MOLECULES!!!! 2H2O The subsc...
COUNT ATOM How to count atoms 2H2O COEFFICIENT SUBSCRIPT 2H2O The coefficient gets applied to the ENTIRE formula -this means that there are 2 molecules of water present! -you MULTIPLY this number by every subscript in the formula 2H2O 2MOLECULES!!!! 2H2O The subscript only gets applied to the element it follows -If there is no subscript present, it is assumed that there is only 1 atom of that element in the molecule. 2H2O How many hydrogen atoms are present? 4 How many oxygen atoms are present? 2 The easiest way to count atoms: 1. Write down all of the symbols for all of the elements present in the formula 2. If there is a coefficient, write this number next to each of the symbols 3. Multiply the coefficient by the subscripts of each of the elements present in the formula Let’s try an example: 4CaCO3 4CaCO3 3CO2 2C6H12O6 6K2SO4 CaMg(CO3)2 3Pb(NO3)2 CH3CH2CH2OH propanol
