burge_ch8_notes

burge_ch8_notes - Chapter 8 Chemical Reactions 2011 Donald...

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©2011 Donald L. Siegel All Rights Reserved Chapter 8 Chapter 8 Chemical Reactions
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©2011 Donald L. Siegel All Rights Reserved Symbolizing chemical reactions Symbolizing chemical reactions W We use chemical equations to symbolize reactions. W The materials we start with, we call reactants. W The materials we end up with, we call products. W The process is symbolized is an arrow
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©2011 Donald L. Siegel All Rights Reserved What does a chemical equation show? What does a chemical equation show? W The equation shows two things What reacts How much reacts W An incomplete equation that only shows “what” is called a skeletal reaction W Na + H 2 O NaOH + H 2 W Conservation of mass A chemical reaction cannot create or destroy matter. W To be complete the reactants and products should indicate states
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©2011 Donald L. Siegel All Rights Reserved Balancing reactions Balancing reactions
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©2011 Donald L. Siegel All Rights Reserved How to balance How to balance W Balance the element that appears in the fewest formulas first W Balance the element that appears in the most formulas last W Example CH 4 + O 2 CO 2 + H 2 O C in 2, H in 2, O in 3. C is already balanced CH 4 + O 2 CO 2 + 2H 2 O 2O 4O CH 4 + 2O 2 CO 2 + 2H 2 O
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©2011 Donald L. Siegel All Rights Reserved Patterns of Chemical Reactivity Patterns of Chemical Reactivity W Combination reactions 2 things combine to make a new thing NH 3 + HCl NH 4 Cl W Decomposition Taking something apart 2KClO 3 2KCl + 3O 2 W Combustion reactions Combining with an oxidant (usually O 2 ) CH 4 + 2O 2 CO 2 + 2H 2 O
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©2011 Donald L. Siegel All Rights Reserved Combustion analysis Combustion analysis W Remember empirical formula? The masses used for that come from combustion analysis W Mainly used for organic compounds Products of combustion CO 2 , H 2 O and N 2 We will mostly ignore the N 2
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©2011 Donald L. Siegel All Rights Reserved
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©2011 Donald L. Siegel All Rights
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burge_ch8_notes - Chapter 8 Chemical Reactions 2011 Donald...

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