bonds broken. A) exergonic B) endergonic C) endothermic D) exothermic E) spontan
ID: 688504 • Letter: B
Question
bonds broken.
A) exergonic
B) endergonic
C) endothermic
D) exothermic
E) spontaneous
2) Which of the following states of matter should have thelowest entropy value?
A) a liquid
B) a gas
C) a crystalline solid
D) Two of these have virtually the same entropy.
A) having a small heat of reaction.
B) being unaffected by catalysts.
C) having a small value of activation energy.
D) having a large value of activation energy.
E) having a large heat of reaction.
4) Which factors would decrease the rate of areaction?
I. Lowering the temperature
II. Increasing the concentration of reactants
III. Adding a catalyst
A) I only
B) I and III
C) III only
D) II and III
E) II only
5) When a reaction system is at equilibrium
A) there is no more chemistry happening.
B) the rates of the reaction in the forward and reversedirections are exactly equal.
C) the amounts of reactants and products are exactly equal.
D) the reaction rate in the forward direction is at amaximum.
E) the reaction rate in the reverse direction is at aminimum.
16) Consider the reaction:
2 CO(g) + O2 (g) 2 CO2(g)
The equilibrium expression for this reaction is
A) [CO][O2][CO2]
B) 2[CO2]2[CO][O2]
C) [CO2]2 [CO]2[O2]
D) [CO2] [CO]+ [O2]
E) [CO]2[O2] [CO2]2
17) The position of the equilibrium for a system where K =4.6 × 10-15 can be described as being
favored to ________; the concentration of products is relatively________.
A) the right; small
B) the left; large
C) the right; large
D) the left; small
E) neither direction; large
18) Which change to this reaction system would cause theequilibrium to shift to the right?
N2 (g) + 3 H2 (g) 2 NH3(g) + heat
A) addition of NH3 (g)
B) heating the system
C) removal of H2 (g)
D) addition of a catalyst
E) lowering the temperature
9) Diatomic nitrogen is added to the equilibriumsystem:
N2 (g) + H2(g) _ 2 NH3(g)+ heat
When a new equilibrium is established the concentration of H2will be ________ the amount at the
original equilibrium, and the amount of NH3 will be ________ theamount at the original
equilibrium.
A) less than; greater than
B) less than; less than
C) greater than; less than
D) greater than; greater than
E) Both changes will be impossible to determine.
10) For the following reaction, increasing the pressure willcause the equilibrium to ________.
2 SO2(g) + O2 (g)_ 2 SO3 (g) +heat
A) remain unchanged, but the reaction mixture will getcooler
B) shift to the right, towards products
C) shift to the left, towards reactants
D) remain unchanged, but the reaction mixture will getwarmer
Explanation / Answer
the definition of exothermic is says energy is released so ibonds formed take less energy to form, energy has beenreleased 2. C) a crystalline solid definition of entropy is molecular randomness. increasingrandom: solid, liquid, gas 3. C) having a small value of activation energy. the lower the activation energy, the lesser energy needed forthe reaction to proceed thus it is more rapid 4. A) I only Increasing the concentration of reactantsAND Adding a catalyst increases the rate of a reaction.decreasing temperature slows down a reaction 5. B) the rates of the reaction in the forward andreverse directions are exactly equal. 16. C) [CO2]2 [CO]2[O2]compound go in brackets while moles come after brackets 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products 3. C) having a small value of activation energy. the lower the activation energy, the lesser energy needed forthe reaction to proceed thus it is more rapid 4. A) I only Increasing the concentration of reactantsAND Adding a catalyst increases the rate of a reaction.decreasing temperature slows down a reaction 5. B) the rates of the reaction in the forward andreverse directions are exactly equal. 16. C) [CO2]2 [CO]2[O2]
compound go in brackets while moles come after brackets 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products 4. A) I only Increasing the concentration of reactantsAND Adding a catalyst increases the rate of a reaction.decreasing temperature slows down a reaction 5. B) the rates of the reaction in the forward andreverse directions are exactly equal. 16. C) [CO2]2 [CO]2[O2]
compound go in brackets while moles come after brackets 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products Increasing the concentration of reactantsAND Adding a catalyst increases the rate of a reaction.decreasing temperature slows down a reaction 5. B) the rates of the reaction in the forward andreverse directions are exactly equal. 16. C) [CO2]2 [CO]2[O2]
compound go in brackets while moles come after brackets 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products C) [CO2]2 [CO]2[O2]
compound go in brackets while moles come after brackets 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products 17. A) the right; small
if kw is near 1 you have equal products and reactants, if kw islarge you have mostly product, but in this case kw is very small soyou have mostly reactant (right) 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products 18. E) lowering the temperature
itthe temperature were to decrease the reaction would be driven tothe right to replace heat lost (le chateleiersprinciple) 9. A) less than; greater than 10. B) shift to the right, towards products
you have two gases on the left, so increasing pressure willshift away towards products
you have two gases on the left, so increasing pressure willshift away towards products
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