7.1-7.4 Quiz Flashcards
What does an equation look like if there is a net gain in reactants?
The reverse arrow is much bigger than the forward arrow
What does a dynamic equilibrium entail?
That the reactants and products are constantly being formed at the same rate they do not stop at equilibrium
What are three important things to remember with the equilibrium constant and reaction quotient problems?
SOLIDS AND LIQUIDS CANNOT BE INCLUDED
BALANCE EQUATIONS
READ QUESTION CAREFULLY- ARE THEY ASKING ABOUT REACTION QUOTIENT OR EQUILIBRIUM CONSTANT; ARE THEY USING GASES OR SOLUTIONS?
At equilibrium how are the reaction quotient and equlibrium constant related?
They are equal
How do you write the equilbrium constant expression for solutions?
The reactants are on the bottom and products on top. You will put everything in brackets and then if there is a number in front of an element/compound put that in the superscript of the problem
How do you write the equilbrium constant expression for gases?
The reactants are on the bottom and products on top. You will put a P before every element/compound, then if there is a number in front of an element/compound put that in the superscript of the problem
What happens when equilibrium is reached?
There are no observable changes to the system. Reactants and products are simultaneously present, and the concentrations or partial pressures of ALL species remain constant
What do we need to know about the equilibrium constant,Kc/Kp?
It tells us if the equation is product or reactants favored. Also, it has no units(neither does the reaction quotient). We use it only if the reaction species has reached equilibrium.
if you are asked which reaction is favored based on an equation how do you answer?
Think of it like a balance
If they said they remove a reactant then the balance will be heavier on product side and you would need to go reverse to even out balance.
So answer= reverse is favored
If you are asked to graph curves to show equilibrium how do you figure out the values?
Use an ICE graph
1) Initial- put down the balanced equation of everything ex: A, 2B, C
- If nothing is mentioned assume 0
2) Change- You might not know this right away but use stoichiometry for this. ex: So, if you know C’s change is .15, then B’s will be .3.
3) Equilibrium- then do the math and this will be the final answer
If you are shown a picture and asked which reaction is favored, reverse or forward, how do you answer?
You look at box 1 vs box 2 and see if there are more of specifically one element/compound and if from box 1 to box 2 if there is less of a reactant, for example, then it is forward because less reactants means more products which is forward.
When do you use the reaction quotient, Qc/Qp?
You use it for the relative concentration of reaction species that have NOT yet reached EQUILIBRIUM
What does an equation look like if there is a net gain in products?
The forward arrow is much bigger than the reverse arrow
How do you know to use Qc/Kc or Qp/Kp?
Qc/Kc is for systems with solutions and then you use concentration. Qp/Kp is used with gases and then you use partial pressures.
Acid
Loses a proton(H+)
If a problem asks you to write an equation for a dissolution and only gives you one reactant what is the other one?
Assume it is water
When the rate of the reverse reaction is greater than the forward reaction what does that mean about the products and reactants?
Reactants are being made faster than the products and there is a net gain in the amount of reactants. The net gain in the amount of reactants will occur until the reaction reaches equilibrium
Sublimation
Solid to gas
How do you do acid/base equations?
You will give an H to one reactant and take away from another
If Kc is low what does that mean about the products and reactants?
Low Kc means low products and high reactants
When the rate of the forward reaction is greater than the reverse reaction what does that mean about the products and reactants?
Products are being made faster than the reactants and there is a net gain in the amount of products. The net gain in the amount of products will occur until the reaction reaches equilibrium
What do the rates look like when equilibrium is reached?
The RATE of the forward and reverse equations are equal not the amounts of reactants and products
Base
Accepts a proton(H +)
If Kc is high what does that mean about the products and reactants?
High Kc means high products and low reactants
If you are asked to graph curves to show equilibrium how do you know when to use values or just give an idea?
If there are numbers available for you to use an ICE table to get x, then solve for x and find those values.
Rate law
write the reactants in bracket then if there is a number before it, put it as an exponent.
Homogenous Equilbrium
All reactants and products are in the same phase
Heterogenous Equilbrium
All reactants and products are in different phase
