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- 1. Multiple ChoiceGrinding a seltzer tablet into powder increases the rate of reaction due to increasedconcentrationsurface areatemperaturereactants
- 2. Multiple ChoiceIncreasing the concentration increases the speed of reaction bylowering activation energyincreasing collisionsspeeding up the reactantsexposing more reactant
- 3. Multiple ChoiceWhich of the following slows down the rate of a chemical reaction?Place the reactants in hot waterPlace the products in ice bathPlace the reactants in a ice bathKeep stirring the reactants with a stirring rod
- 4. Multiple Choice
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?Red, because the activation energy is largerBlue, because the activation energy is lowerboth reaction progress at the same rate - 5. Multiple Choice
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it lowers the activation energy
it increases the energy of particle collisions
it increases the frequency of particle collisions
- 6. Multiple Choice
Why does a higher temperature increase the rate of a reaction?
it increases both the frequency and energy of particle collisions
it only increases the frequency of particle collisions
it only increases the energy of particle collisions
it reduces the activation energy of the reaction
- 7. Multiple ChoiceWhat makes an effective collision?When molecules collide.When molecules collide with the proper orientation.When molecules collide with proper orientation and enough kinetic energy.High Temperature.
- 8. Multiple Choice
The minimum amount of energy needed for colliding particles to react is called
Chemical Energy
Kinetic Energy
Activation Energy
Potential Energy
- 9. Multiple ChoiceWhat type of reaction is this?EndothermicExothermic
- 10. Multiple ChoiceWhat letter represents the activation energy?ABCD
- 11. Multiple ChoiceIs this reaction endothermic or exothermic?endothermicexothermic
- 12. Multiple ChoiceWhat letter represents ΔH?ABCD
- 13. Multiple Choice
What is the change of the heat of the reaction (ΔH)?
-40 kJ
-20 kJ
100 kJ
60 kJ
- 14. Multiple ChoiceWhat is the activation energy?100 kJ175 kJ50 kJ75 kJ
- 15. Multiple ChoiceThis symbol indicates that a reaction is ____________reversibleirreversible
- 16. 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 concentration is constant
Forward and revers reaction rates are equal and concentration is equal
Forward reaction rate is faster than the reverse and concentration is equal
- 17. 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)
- 18. Multiple ChoiceAt what time the reaction reached equilibrium?t1t2t3t4
- 19. Multiple ChoiceHow do catalysts increase the rate of reaction?The frequency of collisions is the increasedthe activation energy is loweredthe energy of collisions is increasedBoth the frequency and energy of collisions is increased
- 20. Multiple Choice
Which of the following are true? Assume this reaction: A is reactant concentration and B is product concentration.
At t3, there are more reactants than products
The equilibrium constant lies to the right
At t3; the amount of reactants and products are equal
At t2; the forward and reverse reaction rates are equal
at t1, the the concentration of the reactants is decreasing and the concentration of the products is increasing
- 21. Multiple Choice
What is the keq for this reaction?
Greater than 1
Less than 1
Exactly 1
Impossible to determine
- Answer choicesTagsAnswer choicesTags