CHEM 1041 Study Guide - Midterm Guide: Inert Gas, Equilibrium Constant, Ice Ih
Ch. 17 Study Guide
• Assume x is small
• Ignore x that is subtracted in denominator
• Catalysts- not in the final equation, appears at beginning and end
• Intermediates- absent in the beginning, present during reaction, disappears at the end
• In equilibrium expression equations- do not include solids or liquids
K and Reactions
• Small K- favors reactants
• Large K- favors products
Determining he Direction of Reaction
• Q<K= reaction shifts right
• Q>K= reaction shifts left
• Q=K= reaction at equilibrium
Le Chatelier’s Principle
• Three common disturbances: a change in concentration, a change in pressure (caused
by a change in volume), or a change in temperature.
o Change in concentration of gaseous component, adding an inert gas, changing
the volume of the reaction vessel
• The effect of temperature on equilibrium involves a change in equilibrium constant
• X + Y= Z
o Increase, increase, decrease = shift right
o Decrease, decrease, increase= shift left
Heat
• Product is exothermic
o Decrease in temp removes heat
• Reactant is exothermic
Temperature and K
• Heat RXN>0= increase in temp =increase in K
• Heat RXN<0= increase in temp = decrease in K
ICE
• I- initial quantities
• C- change
• E-equilibrium
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Document Summary
Ignore x that is subtracted in denominator: assume x is small, catalysts- not in the final equation, appears at beginning and end. Intermediates- absent in the beginning, present during reaction, disappears at the end. In equilibrium expression equations- do not include solids or liquids. K and reactions: small k- favors reactants, large k- favors products. Determining he direction of reaction: qk= reaction shifts left, q=k= reaction at equilibrium. Increase, increase, decrease = shift right: decrease, decrease, increase= shift left. Heat: product is exothermic, decrease in temp removes heat, reactant is exothermic. Temperature and k: heat rxn>0= increase in temp =increase in k, heat rxn<0= increase in temp = decrease in k.
