c161l10_09_23b

c161l10_09_23b - Formation of gases Formation Some...

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Formation of gases Formation of gases W Some reactions releases gases Neutralization of CO 3 2- and S 2- These produce CO These produce CO 2 (g) or H (g) or H 2 S(g) S(g) Products are compounds with low boiling points HCl HCl , NH , NH 3 , H , H 2 O and other are easily put in the gas phase O and other are easily put in the gas phase Other reactions
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Redox reactions Redox reactions W Any reaction which results in a change in oxidation state is a redox reaction W Reduction cannot occur without oxidation or vice versa W Examples 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 CH 4 + 2O 2 CO 2 + 2H 2 O Zn + 2HCl ZnCl 2 + H 2 W OILRIG O xidation i s l oss of electrons, r eduction i s g ain of electrons
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Finding Oxidation States Finding Oxidation States W Oxidation number of an element by itself is ALWAYS zero H 2 , Fe, S 8 are all in the 0 oxidation state W The sum of oxidation numbers of all atoms equals the total charge H 2 O - H is +1, O is -2 2×1+ - 2=0 SO 4 2- - S is +6 and O is -2 6 + 4× - 2= - 2
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c161l10_09_23b - Formation of gases Formation Some...

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