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- 1. Multiple Choice
As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.
increase, decrease
increase, increase
decrease, decrease
decrease, increase
- 2. 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
- 3. Multiple ChoiceThe collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactionsTrueFalse
- 4. Multiple ChoiceMore collisions correspond to a:Faster reaction rateSlower reaction rateConstant reaction rateNone 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 catalyst increase the rate of reaction?it produces extra energy for the reactantsit increases the speed of the reactant particlesit increases the frequency of particle collisionsit reduces the activation energy of the reaction
- 8. Multiple ChoiceWhich of the following increase the reaction rate?less surface arealower temperaturean inhibitorincreased concentration
- 9. 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
- 10. 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
- 11. Multiple ChoiceTo slow down a chemical reaction you will do one of the following:Place the reactants in hot waterPlace the products in ice bathPlace the reactants in a ice bathKeep stirring the reactants with a stirring rod
- 12. 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
- 13. Multiple Choice
Which is the highest concentration?
10m
2M
25 mmol
0.5M
- 14. 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
- 15. 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
- 16. Multiple Choice
Which has more surface area?
Large chunks of chalk
Cube of sugar
Powdered sugar
Small chunks of sugar
- 17. Multiple ChoiceSmaller particle size allows for a _________ surface area to be exposed for the reaction.largersmaller
- 18. Multiple Choice
List four factors that affects the rate of a reaction
temperature
concentration
surface area
volume
catalysts
- 19. Multiple Choice
A temperature increase causes the particles ......
to slow down
move faster
collide higher
in the right order
- 20. 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
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