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- 1. Multiple Choice
Which one of the following is NOT a key concept of the collision theory:
particles must collide in order to react
particles must move slowly when they collide, otherwise they simply “bounce off” one another
particles must collide with the proper orientation
particles must collide with sufficient energy to reach the activated complex in order to react
- 2. Drop Down
Which one of the following factors does not affect the rate of a chemical reaction: (a)
humidityconcentrationtemperaturenature of the reactants - 3. Multiple Choice
The rate of a chemical reaction normally
increases as temperature decreases.
decreases when a catalyst is added.
increases as reactant concentration increases.
decreases as reactant concentration increases.
- 4. Drag and Drop
Crushing a solid into a powder will increase reaction rate because:
(a)the powdered form has more surface areathe particles will collide with more energythe orientation of colliding particles will be improvedthe activation energy barrier will be lowered - 5. Multiple Choice
What happens to a catalyst in a reaction?
It remains unchanged.
It is incorporated into the reactants.
It is incorporated into the products.
It evaporates.
- 6. Multiple Choice
It is generally believed that catalysts increase reaction rates by:
removing the activation energy barrier
providing an alternate activation energy barrier that is lower than the original barrier
lowering the activation energy barrier
giving the reacting particles more energy, thus there will be more successful collisions
- 7. 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
- 8. Drop Down
Why does a higher temperature increase the rate of a reaction?
(a)it increases both the frequency and energy of particle collisionsit only increases the frequency of particle collisionsit only increases the energy of particle collisionsit reduces the activation energy of the reaction - 9. Drag and Drop
The energy needed by reactants for an effective collision is called the (a)
activation energychange in entropychange in enthalpyfree energy - 10. Drag and Drop
What type of reaction is this? (a)
EndothermicExothermic - 11. Drop Down
What is the name given to a catalyst in the human body? (a)
BiologyCatalystChemicalEnzyme - 12. Multiple ChoiceWhich of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?twist the strip of magnesiumgrind up the strip of magnesiumincrease the concentration of the hydrocholoric acidincrease the temperature of the hydrocholoric acid
- 13. Multiple ChoiceWhat is the activation energy?The energy of the productsThe energy of the reactantsThe minimum energy needed by the reactants to form the products.The energy lost in the reaction
- 14. Drag and Drop
"Rate" is related to: (a)
volumetimedistancepercentage - 15. Multiple ChoiceThe 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
- 16. 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.
- 17. Multiple ChoiceWhy don't all collisions between particles cause a reaction?the particles also need to collide with a catalystnot all the particles collide with enough energynot all the particles collide at a high enough temperaturethe particles need to collide with each other twice
- 18. Multiple Choice
According to the graph, it can be concluded that
As reaction progresses, the concentration of product will reduce and the reactant will increase
As reaction progresses, the concentration of product and reactant will reduce
As reaction progresses, the concentration of product and reactant will increase
As reaction progresses, the concentration of product will increase, the reactant will reduce
- 19. Drop Down
What is the energy of the activated complex? (a)
75 kJ225 kJ300 kJ50 kJ - 20. Drag and Drop
More collisions correspond to a: (a)
Faster reaction rateSlower reaction rateConstant reaction rate - 21. Multiple ChoiceWhich of the following is/are the fundamental idea(s) of collision theory?Molecules react by colliding togetherThe effective collisions must occur with certain minimum amounts of energyIn a large sample, the greater the number of effective collisions, and the faster the rate of reactionAll of the above
- 22. Multiple Choice
When does a chemical reaction stop?
When the lab is finished.
When the limiting reactant is used up.
When the excess reactant is used up.
Chemical reactions never stop.
- 23. Drop Down
Which of the following is NOT a factor affecting reaction rate? (a)
temperaturecatalystsparticle sizepolarity - 24. Drag and Drop
Based on the collision model, the atoms in the top of potential energy ‘’hill’’ are called (a)
Top of hillActivation energyTransition stateSteric factor - 25. Drop Down
Just like the cars in a demolition derby, all else being equal, the faster particles move the (a)
harder the collisions will befewer collisions will occurmore reactants are createdmore volume they will occupy - 26. Drag and Drop
The speed at which a chemical reaction proceeds is called (a)
the Mach numberthe kinetic constantterminal velocitythe reaction rate - 27. Multiple Choice
When its forward and reverse rates are equal, a reaction is said to be ___
balanced
stable
in its ground state
at equilibrium
- Answer choicesTagsAnswer choicesTags