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- 1. Multiple Choice
What criteria must be met for reactant collisions to result in a successful product?
The reactants must collide with each other
The reactants must collide with enough energy and be in the right positions
The reactants must have enough energy to form the activated complex
- 2. Multiple ChoiceThe collisions which bring about a chemical reaction are called:Consistent collisionsNormal collisionsEffective collisionsNone of the above
- 3. Multiple ChoiceMore collisions correspond to a:Faster reaction rateSlower reaction rateConstant reaction rateNone of the above
- 4. 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
- 5. Multiple ChoiceWhich factors increase the rate of a reaction.increasing temperatureincreasing concentrationincreasing surface areaall of these
- 6. Multiple ChoiceIncrease in temperature of the reactants can do one of the followingSlow collision frequencyAllow less effective collision between the particlesNeutralise the reactionincrease collision between the particles thus increasing the rate.
- 7. Multiple ChoiceWhy does a higher temperature increase the rate of a reaction?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
- 8. Multiple Choice
How could we make this reaction happen more quickly?
Decrease the concentration of the acid
crush the chalk to increase the surface area
Put the test tube in an ice bath
- 9. Multiple Choice
When surface area is decreased the rate of reaction...
Decreases, because there are LESS possible sites for correct collisions
Increases, because there are LESS possible sites for correct collisions
Decreases, because there are MORE possible sites for correct collisions
Increases, because there are MORE possible sites for correct collisions
- 10. Multiple Choice
Which has more surface area?
Large chunks of chalk
Cube of sugar
Powdered sugar
Small chunks of sugar
- 11. Multiple Choice
A temperature increase causes the particles ......
to slow down
move faster
collide higher
in the right order
- 12. Multiple Choice
How does a catalyst work in speeding up a reaction?
By lowering the activation energy of reaction
by giving them more energy
by making them more available
- 13. Multiple ChoiceWhich of the following is NOT a factor affecting reaction rate?temperaturecatalystsparticle sizepolarity
- 14. Multiple Choice
What is the rate of reaction?
How much energy is needed for a reaction to occur.
The energy required to break a bond.
The time it takes for a reaction to occur.
Collision Theory
- 15. Multiple Choice
Which of the following increase the reaction rate?
less surface area
lower temperature
increased concentration
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