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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 ChoiceUnder the collision theory, the particles must collide with ____ and ____ for a reaction to occur.sufficient rate and sufficient energysufficient surface area and correct orientationsufficient catalyst and sufficient energysufficent energy and correct orientation
- 3. Multiple ChoiceThe energy needed by reactants for an effective collision is called theactivation energychange in entropychange in enthalpyfree energy
- 4. Multiple ChoiceThe rate of a reaction increases as temperature__________________.DecreasesIncreasesStays the Same
- 5. Multiple ChoiceProducts will form faster if____________the particle size of the reactants are larger.temperature is decreased.concentration of the reactants are increased.the reaction is not stirred.
- 6. Multiple ChoiceA ______________ is a substance that increases the rate of a reaction without being used up during the reaction.catalystproductreactantsolute
- 7. Multiple ChoiceSmaller particle size allows for a _________ surface area to be exposed for the reaction.largersmaller
- 8. Multiple ChoiceActivation energy is required to start a chemical reaction. What is activation energy?The maximum amount of energy usedThe minimum amount of energy required to cross the reaction barrierThe energy of the reactantsThe energy possessed by the products
- 9. Multiple ChoiceWhich factors increase the rate of a reaction.increasing temperatureincreasing concentrationincreasing surface areaall of these
- 10. Multiple Choice
In an endothermic reaction the products havemore energy than the reactantsless energy than the reactantsthe same energy as the reactantsno energy - 11. Multiple ChoiceWhat type of reaction is this?EndothermicExothermic
- 12. Multiple ChoiceWhat letter represents the activation energy?ABCD
- 13. Multiple Choice
Identify which factors would decrease the speed of a reaction.
heating the reaction container
increasing the volume of the container
stirring the solution
adding a catalyst
using large clumps of reactants
- 14. Multiple ChoiceIncrease in temperature of the reactants can do one of the followingSlow collision frequencyAllow less effective collision between the particlesCause particles to lose speedIncrease collision between the particles thus increasing the rate.
- 15. Multiple ChoiceGrinding a seltzer tablet into powder increases the rate of reaction due to increasedconcentrationsurface areatemperaturereactants
- 16. Multiple ChoiceExothermic reactions release heat to the surroundings.truefalse
- 17. Multiple ChoiceIncreasing the concentration of the reactants will slow down the reaction.falsetrue
- 18. Multiple ChoiceIn an endothermic reaction the products havemore energy than the reactantsless energy than the reactantsthe same energy as the reactantsno energy
- 19. Multiple ChoiceIn an exothermic reaction the products havemore energy than the reactantsthe same energy as the reactantsless energy than the reactantsno energy
- 20. 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
- 21. Multiple ChoiceWhich of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?tightly coil up the strip of magnesiumcut up the strip of magnesiumincrease the concentration of the hydrocholoric acidincrease the temperature of the hydrocholoric acid
- 22. Multiple ChoiceExothermic reactions...Absorb energyRelease energyRelease ColorAbsorb Color
- 23. Multiple ChoiceRate of chemical reaction meansamount of product formedspeed of reactionconcentration of reacting particlescombining reactants with products
- 24. Multiple Choice
What is a catalyst?
A substance that increases the activation energy
A substance that lowers the activation energy
A substance that reacts with reactants
A substance that increases the kinetic energy particles have
- 25. Multiple Choice
What is a catalyst?
A substance that increases the activation energy
A substance that lowers the activation energy
A substance that reacts with reactants
A substance that increases the kinetic energy particles have
- 26. Multiple Choice
Which of the following is not essential for a reaction to occur?
The correct collision geometry
Sufficient energy passed the activation energy
A collision between particles
A temperature over 30 degrees
- 27. Multiple ChoiceThe study of reaction rates and factors affecting these ratesequilibriumkineticscomplexcollision
- 28. Multiple Choice
Which of the following best describes why increasing temperature increase reaction rate?
Activation energy is reduced.
Collisions become more frequent.
Collisions become more energetic.
Collisions become more frequent and more energetic.
- 29. Multiple ChoiceWhat is the purpose of an enzyme?give permission for the reactionraise activation energyspeed up reactionscontrol how many reactions occur
- 30. Multiple ChoiceEnzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?reducing the number of productsreducing the activation energyincreasing the temperature of the cellincreasing the concentration of reactants
- 31. Multiple ChoiceWhat is a substance called if it speeds up a chemical reaction?reusablecatalystspecificfragile
- 32. Multiple ChoiceAn enzyme speeds up a chemical reaction in the cell but can only be used once. True or False?truefalse
- 33. Multiple Choice
What happens when enzymes are heated to a high temperature?
The enzymes die.
The shapes of the enzyme are altered (denaturation)
The enzymes' amino acid sequence changes.
The enzymes remain the same
- 34. Multiple ChoiceWhat is another name for enzymes?chemical catalystsmicroorganismsbiological catalystsinorganic catalysts
- Answer choicesTagsAnswer choicesTags