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- 1. Multiple ChoiceLe Chatelier's Principle states that if a chemical system at equilibrium is stressed,the system will adjust to increase the stressthe system will adjust to reduce the stressthe system will not adjust
- 2. Multiple ChoiceWhen writing an endothermic reaction, heat energy is stated as aproductcatalystreactantSpicy Switze
- 3. Multiple ChoiceWhat are the two factors to look for when determining if the reaction is at equilibrium?Forward reaction rate is faster than the reverse and concentrations are equalForward and reverse reaction rates are equal and concentration is constantForward and revers reaction rates are equal and concentration is equalForward reaction rate is faster than the reverse and concentration is equal
- 4. Multiple Choice
This symbol indicates that a reaction is ____________
reversible
irreversible
- 5. Multiple Choice
When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in
Chemical Equilibrium
Chemical Balance
Stoichiometry
Chemical Reaction
- 6. Multiple ChoiceDefine chemical equilibrium.A reaction is reversible.The concentration of the reactants is equal to the concentration of the products.The rate of a forward reaction is equal to the rate of the reverse reaction.The reaction stops and no further change in concentration occurs.
- 7. Multiple ChoiceWhich of the following is NOT true at equilibrium?The forward and reverse reactions proceed at the same rate.The concentrations of reactants and products do not change.The concentration of the reactants is equal to the concentration of the products.The forward and reverse reactions continue to occur.
- 8. Multiple ChoiceThe idea that when a system at equilibrium is stressed, it will react to relieve that stress and return to equilibrium is known as:Boyle's LawLe Chatelier's PrincipleCharles LawSwitzer's Law
- 9. Multiple Choice
For the reaction...
SO2 + O2 <−> SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.
left
right
left and right
neither left nor right
- 10. Multiple Choice
For the reaction...
SO2 + O2 <−> SO3
If the concentration of O2 is increased, the equilibrium of the reaction will shift ___________.
left
right
left and right
neither left nor right
- 11. Multiple ChoiceFor the reaction...
heat + N2 + O2 ↔ 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.leftrightleft and rightneither left nor right - 12. Multiple ChoiceA chemical reaction that produces energy is anendothermic reactionexothermic reactionenergyexistential crisis
- 13. Multiple ChoiceA chemical reaction that requires energy is anexothermic reactionendothermic reactionover reactionswitzothermic reaction
- 14. Multiple Choice
Identify the incorrect statement about achieving equilibrium.
achieved when product and reactant concentrations are equal
achieved when forward and reverse reaction rates are same
achieved when concentration of reactants is stable/constant
achieved when concentration ratio of reactants to products becomes stable, thus fixing the equilibrium constant (equilibrium position)
- 15. Multiple ChoiceWhy is equilibrium called a dynamic state?Chemists try to convert as much reactants as possible into products.The reactions at equilibrium continue to take place once equilibrium is established.The products of a forward reaction are favored, so equilibrium lies to the right.All chemical reactions are considered to be reversible under suitable conditions.
- 16. Multiple Choice
At what time (in seconds) is equilibrium established?
0 seconds
1 second
5 seconds
10 seconds
- 17. Multiple Choice
An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift
no change in the equilibrium
toward the reactant side
toward the product side
- 18. Multiple Choice
What causes the reaction to favor the REVERSE reaction?
A + B ↔ C + D + energy
Decreasing D
Increasing C
Decreasing A
Decreasing Temperature
- 19. Multiple Choice
What causes the reaction to favor the FORWARD reaction?
A + B ↔ C + D + energy
Increasing D
Increasing C
Increasing B
Increasing Temperature
- 20. Multiple ChoiceWhat is LeChatelier's Principle?Stresses do not shift a reactionEquilibrium does not existA stress only shifts a reaction to the rightA reaction at equilibrium will shift to relieve a stress
- 21. Multiple ChoiceDefine chemical equilibrium.A reaction is reversible.The concentration of the reactants is equal to the concentration of the products.The rate of a forward reaction is equal to the rate of the reverse reaction.The reaction stops and no further change in concentration occurs.
- 22. Multiple Choice
If a reaction is reversible and has reached equilibrium, what can be said about the amounts of reactants and products?
some reactant, some product
no reactant, all product
all reactant, no product
- 23. Multiple ChoiceAccording to the reaction below, if you needed to shift the reaction towards the products you would need to add more
Na2SO4 (s) <--> 2Na+(aq) + SO42- (aq)Na2SO4 (s)Na+(aq)SO42- (aq)None of the above - 24. Multiple ChoiceWhich of the two graphs reaches equilibrium?The left one.The right one.Both of them.Neither.
- 25. Multiple Choice
At what time the reaction reached equilibrium?
t1
t2
t3
t4
- 26. Multiple Choice
For the reaction...
N2 + O2 + energy <=> 2NO
If the temperature is increased the equilibrium position will shift _______.
to the left
to the right
to the left and right
neither left nor right
- 27. Multiple Choice
Le Chatelier's Principle states that....
If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium................
moves to increase the change
moves to counteract the change
does not change
- 28. Multiple ChoiceFor the reaction...
energy + N2(g) + O2(g) <−> 2NO(g)
If the heat is added to the chemical system, the equilibrium will _______.shift to the leftshift to the rightnot shift - 29. Multiple ChoiceFor the reaction...
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.shift to the leftshift to the rightnot shift - 30. Multiple Choice
What are the two factors to look for when determining if the reaction is at equilibrium?
Forward reaction rate is faster than the reverse and concentrations are equal
Forward and reverse reaction rates are equal and concentrations are constant
Forward and reverse reaction rates are equal and concentrations are equal
Forward reaction rate is slower than the reverse and concentrations are equal
- 31. Multiple Choice
Given the reaction:
N2(g) +O2(g) + energy <--> 2 NO(g)
Which change would cause an immediate increase in the rate of the forward reaction?
increasing the concentration of NO(g)
increasing the concentration of N2(g)
decreasing the reaction temperature
decreasing the reaction pressure
- 32. Multiple ChoiceGiven the reaction at equilibrium:
2SO2(g) +O2(g) <--> 2SO3(g) + HEAT
Which change will shift the equilibrium to the right?increasing the temperatureincreasing the pressuredecreasing the amount of SO2(g)decreasing the amount of O2(g) - 33. Multiple Choice
When the rate of the forward reaction is equal to the rate of reverse reaction, the system is said to be in
Chemical Equilibrium
Chemical Balance
Chemical Constant
Chemical Reaction
- 34. Multiple Choice
It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.
reversible reaction
irreversible reaction
decomposition reaction
synthesis
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