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### Lecture 7 Notes

Course: 004 007, Summer 2008
School: University of Iowa
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Word Count: 109

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Lecture 7 Notes Empirical formula o the simplest whole-number ratio of atoms in a molecule is called the empirical formula. o Determined from percent composition or combining masses C 74.03% H 8.70% N 17.27% &lt;a href=&quot;/keyword/molar-mass/&quot; &gt;molar mass&lt;/a&gt; =162.23 g/mol C4.999H6.98N C5H7N Chapter 7 o Balancing chemical equations 2H2 + O2 2H2O 4 + 32 36 o &lt;a...

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Lecture 7 Notes Empirical formula o the simplest whole-number ratio of atoms in a molecule is called the empirical formula. o Determined from percent composition or combining masses C 74.03% H 8.70% N 17.27% <a href="/keyword/molar-mass/" >molar mass</a> =162.23 g/mol C4.999H6.98N C5H7N Chapter 7 o Balancing chemical equations 2H2 + O2 2H2O 4 + 32 36 o <a href="/keyword/chemical-reaction/" >chemical reaction</a> Change of one or more substances into new ones Involves rearrangement and exchange of atoms to produce new molecules Reactantproduce o Evidence of <a href="/keyword/chemical-reaction/" >chemical reaction</a> Visual clues: color changes, gas bubbles, etc. Other clues: new odor or state o + = reacts with (s)= solid (l)=liquid (g)=gas (aq)=aqueous
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University of Iowa - 004 - 007
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University of Iowa - 004 - 007
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