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- 1. Multiple ChoiceIf a catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there will be no effect on therate of the forward reactionactivation energy of the reactionrate of the reverse reactionheat of reaction
- 2. Multiple ChoiceTwo reactant particles collide with proper orientation.The collision will be effective if the particles havehigh activation energyhigh ionization energysufficient kinetic energysufficient potential energy
- 3. Multiple ChoiceAdding a catalyst to a chemical reaction changes the rate of reaction by causinga decrease in the activation energyan increase in the activation energya decrease in the heat of reactionan increase in the heat of reaction
- 4. Multiple ChoiceA piece of Mg(s) ribbon is held in a Bunsen burnerflame and begins to burn according to the equation:
2Mg(s) + O2 (g) −> 2MgO(s).
The reaction begins because the reactantsare activated by heat from the Bunsen burner flameare activated by heat from the burning magnesiumunderwent an increase in entropyunderwent a decrease in entropy - 5. Multiple Choice
Compared to the rate of inorganic reactions, the rate of organic reactions generally is
slower because organic particles are ions
slower because organic particles contain covalent bonds which take a long time to break
faster because organic particles are ions
faster because organic particles contain covalent bonds
- 6. Multiple ChoiceWhen one mole of a certain compound is formed from its elements under standard conditions, it absorbs 85 kiloJoules of heat. A correct conclusion from this statement is that the reaction has aΔH equal to –85 kJ/moleΔH equal to +85 kJ/moleΔequal to –85 kJ/moleΔequal to +85 kJ/mole
- 7. Multiple Choice
Which interval represents the activation energy of the forward reaction?ABCE - 8. Multiple ChoiceWhich interval represents the heat of reaction for the reaction?ABDE
- 9. Multiple ChoiceInterval C in this potential energy diagram could be changed by adding a ________?CookiesMore energyCatalystChanging the temperature
- 10. Multiple Choice
Given the reaction:
CH4(g) + 2 O2(g) --> 2 H2O(g) + CO2(g)
What is the overall result when CH4(g) burns according to this reaction?
Energy is absorbed and H is negative.Δ
Energy is absorbed and ΔH is positive.
Energy is released and ΔH is negative.
Energy is released and ΔH is positive
- 11. Multiple Choice
In table I the reaction of hydrogen and oxygen to form water is best described as
exothermic, because energy is released
endothermic, because energy is released
exothermic, because energy is absorbed
endothermic, because energy is absorbed
- 12. Multiple ChoiceWhich numbered interval on the diagram would change when a catalyst is added?B & CC & DE & CA & D
- 13. Multiple ChoiceWhich term refers to the difference between thepotential energy of the products and the potential energy ofthe reactants for any chemical change?heat of depositionheat of fusionheat of reactionheat of vaporization
- 14. Multiple ChoiceWhich is a factor that would not affect the rate of a reaction?TemperatureAdding a catalystConcentrationThe weather
- 15. Multiple ChoiceWhich picture shows how a catalyst would change the rate?Option 3Option 2Option 1
- 16. Multiple Choice
Temperature is a measure of average ________ energy of individual atoms.
heat
potential
mechanical
kinetic
- 17. Multiple ChoiceΔH value in an endothermic reaction is a positive number.TrueFalse
- 18. Multiple Choice
Given the equation representing a reaction at equilibrium:
N2(g) + 3H2(g) --> 2NH3(g) + energy
Which change causes the equilibrium to shift to the right?
decreasing the concentration of H2(g)
decreasing the pressure
increasing the concentration of N2(g)
increasing the temperature
- 19. Multiple ChoiceGiven the reaction at equilibrium:
Which change will not affect the equilibrium concentrations of A(g), B(g), and A2B3(g)?adding more A(g)adding a catalystincreasing the temperatureincreasing the pressure - 20. Multiple ChoiceAmmonia is produced commercially by the Haber reaction: N2 + 3 H2 --> 2 NH3
The formation of ammonia is favored byan increase in pressurea decrease in pressureremoval of N2(g)removal of H2(g) - 21. Multiple ChoiceWhich statement is true for a saturated solution?It must be a concentrated solution.It must be a diluted solution.Neither dissolving nor crystallizing is occurring.The rate of dissolving equals the rate of crystallizing.
- 22. Multiple ChoiceGiven the reaction at equilibrium:
N2(g) + 3H2(g) ↔ 2NH3(g)
Increasing the concentration of N2(g) will increase the foward reaction rate due toa decrease in the number of effective collisionsan increase in the number of effective collisionsa decrease in the activation energyan increase in the activation energy - 23. Multiple ChoiceGiven the reaction at equilibrium:
N2(g) + O2(g) ↔ 2NO(g)
As the concentration of N2(g) increases, the concentration of O2(g) willdecreaseincreaseremain the same - 24. Multiple ChoiceGiven the reaction system in a closed container at equilibrium and at a temperature of 298 K:
N2O4 (g) <--> 2NO2 (g)
The measurable quantities of the gases at equilibrium must bedecreasingincreasingequalconstant - Answer choicesTagsAnswer choicesTags