Solution Equilibrium
Equilibrium Constant
Le Chatelier's Principle
Units 1-3
Random
100
Is solution equilibrium a physical or chemical equilibrium? Why?
Physical, solutions are a physical change. It doesn't obey the rules of chemical equilibrium.
100
How does one calculate the equilibrium constant?
[product]^coefficient*[product]^coefficient [reactant]^coefficient*[reactant]^coefficient
100
What does Le Chatelier's principle state?
That a system at equilibrium will resist any stress put upon it.
100
Why does the rate of reaction change with an increase in temperature.
Particles impact more frequently and with more force.
100
A mother saw her daughter 30m away about 50m from a polar bear if the polar bear can travel at 18m/s and the mother can travel at 7m/s, will she get to her daughter before the bear if the she has to travel an additional 5 metres around a bunch of penguins?
Yes, Polar bears exist in the northern hemisphere and penguins in the south, so this situation must be taking place in a zoo.
200
What is equal in solution equilibrium?
The rate of dissolving and the rate of crystalization.
200
Write the equilibrium constant equation for electrolysis of water into H2 and O2.
[H2]^2[O2] [H2O]^2
200
If you wanted to change the K value of a system at equilibrium what must you change?
Temperature.
200
A solution that has dissolved as much solute as it can and then has had the temperature reduced is called what?
Supersaturated.
200
The rich need it, the poor have it, and if you eat it you will die. What is it?
Nothing.
300
Which of the three states of concentration of a solution (unsaturated, saturated and supersaturated) can equilibrium occur in?
Saturated.
300
What is the equation for K for displacement reaction Zn + 2AgCl(aq) = 2Ag + ZnCl2(aq)
[ZnCl] [AgCl]^2
300
Describe what happens to the chemical system A + B = C + D + 57kJ when the temperature is increased.
Reactants are favoured because the reverse reaction is endothermic which is sped up by the increase in temperature.
300
Why doesn't a catalyst effect the K value?
It speeds up both the forward and reverse reaction.
300
What is the approximate molar mass of Scandium Oxygen Thorium and Al?
44+16+232+27=319g or 85kg
400
If a solution held exactly as much solute as it could dissolve at a certain temperature/pressure, and 5g of solute is added will this added solute ever dissolve if the conditions remain the same?
Yes, however new solute will form at the same rate.
400
Ca3(PO4)2(s) = 3Ca(aq) + 2PO4(aq)
[Ca]^3*[PO4]^2 1
400
For the reaction X2(g) + 3Y2(g) = 2XY3(g) at equilibrium; what would be the result of decreasing the amount of X2?
[XY3]^2 Decreases [X2] decreases*[Y2]^3 increases.
400
If two reactant particle impact each other and do not form the activated complex, give two reasons why they may have a successful impact in the future.
Better geometry of impact. Better vector of impact.
400
Why are manhole covers round?
Easier to roll to transport, the diameter is equal so it can not fall down the hole.
500
If a solution is saturated with excess solute and the temperature is increased, describe what will happen to the solute immediately and after the temperature returns? What will happen to the equilibrium?
Solute dissolves and remains dissolved. Equilibrium will be met and then lost.
500
HCN= 0.25M H+=1.5*10^-4M CN-=2.3*10^-3M what is the Q value? Is it at equilibrium if K=6.2*10^-10
1.4*10^-6 K is not equal to Q
500
For the reaction X2(g) + 3Y2(g) = 2XY3(g) at equilibrium; what would be the result of decreasing the pressure?
Reactants favoured. Decrease in pressure favours increase in gas particles to equalize gas pressure.
500
What is the difference between a catalyst and a reaction intermediate?
Catalysts exist at the begining and end of a reaction but are in other compounds during the mechanism of reaction, whereas intermediates are apart of neither the reactants or products but are present during the mechanism of reaction.
500
What is the biggest organism on earth?
Giant Sequoia/ Redwood
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