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| Question | Answer |
| A + B <--> C + D | reversible reaction |
| ------------> <------- | Reaction is product favored |
| ----> <------------- | Reaction is reactant favored |
| A + B --> C + D | Forward reaction |
| C + D ---> A + B | Reverse reaction |
| Keq aA + bB <--> cC + dD | Keq = [D]^d [C]^c / [A]^a [B]^b |
| Keq >> 1 | reaction is product favored |
| Keq << 1 | Reaction reactant favored |
| Keq about equal to 1 | no direction is favored |
| Reaction multiplied by a factor, K is... | raised to the same factor |
| Reaction is reversed | K(reverse) = 1/K(forward) = 1/Keq |
| When adding reactions together, their Keqs are... | Multiplied together |
| When writing equilibrium expressions, do NOT include... | solids and pure liquids because they are considered condensed phases, therefore their concentration does not change |
| Conversion of Kc to Kp | Kc = Kp (1/RT) ^change in moles of gas |
| Kp and Kc have units of... | No units because each concentration and pressure is divided by their standard unit/state |
| Mixed equilibrium constants have.... | units! |
| R. I. C. E | Reaction. Initial (concentration/pressure). Change. Equilibrium |
| If Q = K, reaction is.... | at equilibrium |
| If Q < K.... | reactants are favored; reaction proceeds in the reverse direction |
| If Q > K.... | products are favored; the reaction proceeds in the forward direction |
| Le Châtelier's Principle | when stress is applied on a system, the system will offset that stress in a specific fashion |
| If more of a reactant is added to a reaction.... | the reaction will shift in the forward direction |
| If more of a product is added to a reaction.... | The reaction will shift in the reverse direction... |
| Solids and pure liquids added will... | produce no change |
| Catalysts added to a reaction will.... | produce no change |
| If some of a reactant is removed from the reaction... | the reaction will shift in the reverse direction |
| If some of a product is removed from the reaction... | the reaction will shift in the forward direction |
| If the container the reaction takes place in expands, the reaction will.... | shift in the direction with the larger number of gas particles |
| If the container the reaction takes place in compresses, the reaction will... | shift in the direction with the smaller number of gas particles |
| If heat is added to the reaction | the reaction will shift away from the heat (ie heat added to an endothermic reaction will drive it right; heat added to an exothermic reaction will drive it left) |
| If a reaction is cooled | the reaction will shift toward the heat (ie heat removed from an endothermic reaction will drive it left; heat removed from an exothermic reaction will drive it right) |
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