Ch Reactions Student Notes

# Ch Reactions Student Notes - 1 Chapter Medley: Chemical...

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1 Chapter Medley: Chemical Equations and Reactions To help you with upcoming Chem 101 lab experiments, we will combine the various types of chemical reactions into this mid-quarter chapter medley. I. Writing and Balancing Chemical Equations (Ch 6.6) II. Types of Chemical Reactions A. Combination Reactions (Ch 9.1) B. Decomposition Reactions (Ch 9.1) C. Single-Replacement Reactions (Ch 9.1) D. Double-Replacement Reactions (Ch 9.1) Solubility Rules (Ch 8.4) E. Combustion Reactions (Ch 9.1) F. Oxidation – Reduction Reactions Supplemental Material: Comparing Strength of Agents G. Acid-Base Neutralization Reactions (Ch 10.1, 10.6 & 10.7)

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2 I. Writing and Balancing Chemical Equations (Ch 6.6) demo: Combustion of ethanol Reactant Products ethanol + oxygen carbon dioxide + water C 2 H 6 O + 3 O 2 2 CO 2 + 3 H 2 O Balanced Equation Law of Conservation of Mass An equation coefficient is a multiplier that applies to all atoms and subscripts. It changes the amount, but not the _____________, of the substance. A coefficient of 1 in a balanced equation is not explicitly written.
3 Physical states of reactants and products may be indicated: ( s ) for solid ( l ) for liquid ( g ) for gas 4 Fe( s ) + 3 O 2 ( g ) 2 Fe 2 O 3 ( s ) Reactions of substances in _______ solution are indicated by the symbol ( aq ), meaning aqueous : Zn( s ) + 2 HCl( aq ) ZnCl 2 ( aq ) + H 2 ( g )

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4 A capital Greek delta ( ) placed above the arrow indicates that the reaction occurs at ______________. The actual temperature required also may be written above or below the arrow. 350 o C The symbol for a catalyst may also appear above or below the arrow. A catalyst increases the _______ of the reaction but is not consumed. Pt CH =CH (g) + H (g) CH 3 CH 3 (g) 2 2 2 200 o C
5 Guidelines for Balancing Chemical Equations Begin with an element that appears in only a single substance on each side of the equation. If there are several such elements, select the substance that has the largest number of atoms of a single element. To balance an equation, change only coefficients in front. NEVER change _______________ . Proceed to balance the atoms of other elements by the same process. Check to see if balancing one element in a substance has caused others to become unbalanced and make necessary corrections. Balance atoms that appear in two or more places on one side of the equation. Check and reduce all coefficients to smallest set of whole numbers (eliminate fractions).

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Practice Problem of Balancing an Equation FeI 2 + Cl 2 FeCl 3 + I 2 (unbalanced) 1. balance Cl atoms FeI 2 + 3 Cl 2 2 Fe Cl 3 + I 2 (unbalanced) 2. balance Fe atoms 2 Fe I 2 + 3 Cl 2 2 Fe Cl 3 + I 2 (unbalanced) 3. balance I atoms 2 Fe I 2 + 3 Cl 2 2 Fe Cl 3 + 2 I 2 balanced Do a final check by counting atoms on each side! 2 Fe
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## This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Fall '08 term at Ohio State.

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Ch Reactions Student Notes - 1 Chapter Medley: Chemical...

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