chapter 17_1 equilibruim completed
TRANSCRIPT
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Chapter 17
lesson 1A state of dynamic balance
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Tug of war
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H2 + O2 H2O
H2 + O2 H2O
What is the difference between the 2
reactions ?
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What is the differencebetween the reactions ?
1) H2 + O2 H2O
2) H2 + O2 H2O
3) H2 + O2 H2O
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Homogenous and heterogeneousequilibrium
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Tell whether each is ahomogenous or a heterogeneouseq
1)H2O(aq) H+(aq) + OH-
(aq)
2)PbCrO4 (s) Pb2+(aq) + CrO42-(aq)
3)Zn (s) + 2 H+(aq) Zn2+
(aq) + H2 (g)
4)N2O4 (g) 2 NO2 (g)
5)Zn (s) + 2 H+(aq) Zn2+
(aq) + H2 (g)
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The equilibrium between reactants andproducts is described by an equilibrium
constant. For the balanced reaction:aA + bB cC + dD
The equilibrium constant, Keq is defined as:
[C]c [D]d
Keq =P/R =
[A]a [B]b
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Rules for writing equilibrium constant
1) solids and liquids are cancelled
2) products over reactants
3) coefficients become powers .
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Write the equilibrium expression
1) solids and liquids are cancelled
2) products over reactants
3) coefficients become powers
1)H2O(l) H+(aq) + OH-
(aq)
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Write the equilibrium expression
1) solids and liquids are cancelled
2) products over reactants
3) coefficients become powers
2)PbCrO4 (s) Pb2+(aq) + CrO42-(aq)
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Write the equilibrium expression
1) solids and liquids are cancelled
2) products over reactants
3) coefficients become powers
3)Zn (s) + 2 H+(aq) Zn2+
(aq) + H2 (g)
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PCl5 (g) PCl3 (g) + Cl2(g)
1) is this reaction reversible ?why
2) is it at equilibrium ?why
3) is it homogenous or heterogeneous ?why
4) write keq expression .
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Continued 17.1Chemical equilibrium
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What describes a reaction thathas reached equilibrium?
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Conditions of equilibrium
1. reactants and products must be
present 2. closed container should be used
3. temperature is constant
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Find Keq for the following reaction
N2 (g) + O2 (g) 2NO (g)
Write Keq :
Find Keq if [N2]=0.2M , [ O2]=0.3M and
[NO]=0.6M
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Values of Keq :
1.
2.
3.
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At equilibrium
solids and liquids are notconsideredgases and aqueous are considered
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C10 H 8 (s) C 10 H 8 (g)
1. write Keq :
Find Keq when [ C10H8]=1M
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Consider the reaction
Fe O (s) + CO (g) Fe (s) + C O 2 (g)
1. write Keq :
Calculate Keq when 2 moles of CO
produce 2 moles of CO2 in a 2L container.
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Write the chemical equation
that has the equilibriumconstant Keq =[CO]2[O2]
[CO2]2
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PCl5(g) PCl3(g)+Cl2 (g)
If [ PCl 3] = 0.55 M and [PCl5]=0.135,Keq=2.24
Find [ Cl2]
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At which temp is theconcentration of products the
greatest ?
Temp 263 k 273 k 373 k
Keq 0.025 0.5 4.5