Unit 7 Equil Flashcard

What is equal in an equilibrium?
rate of the forward and rate of reverse reaction rates
What is constant at equilibrium?
concentration of reactants and products
What occurs in a saturated solution?
the rate of dissolving equals the rate of precipitation, so all saturated solutions are at equilibrium
What occurs during a phase change?
the forward change occurs at an equal rate as the reverse,
for example, melting rate equals the freezing rate
so you get a solid/liquid equilibrium
In terms of Le Chatelier’s Principle, what occurs?
the reaction will shift forward or reverse, depending on the stress
What occurs to equilibrium when pressure is increased?
the reaction shifts to the side with less moles of GAS , to relieve the pressure
What occurs to equilibrium when pressure is decreased?
the reaction shifts to the side with more moles of GAS , to keep the pressure
What occurs to equilibrium when a catalyst is added?
equilibrium is not affected
What does a catalyst do to a reaction?
lowers the activation energy by creating a new lower pathway
What can 4 factors can increase a reaction rate?
increase temperature
increase surface area(crushing, powder)
increase concentration
add a catalyst
What is the heat of reaction, ?H?
potential energy of the products – reactants
What is the activation energy?
the minimum energy needed to start a reaction
What is endothermic?
heat is absorbed by the system,
?H +
heat is on the reactant side
temperature decreases (the energy was absorbed by the system, away from the thermometer)
What is exothermic
heat is released by the system,
?H –
heat is on the product side
temperature increases (the energy was released by the system)
How can you identify combustion?
hydrocarbon + O2 => water and carbon dioxide
How can you identify decomposition?
One reactant => more than one product
How can you identify synthesis?
More than one reactant => one product
How can you tell single replacement?
one element replacing another in a compound
occurs when single element is more active on Table J

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