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Study Quiz 1
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1
Which phrase does not describe a reaction rate?
A)The change of the concentration of a reactant over time
B)The change of the number of moles of a reactant over time
C)The difference between the concentrations of reactants and products
D)The difference between the initial and final concentrations of one reactant over time
2
How can chemists collect empirical data necessary for measuring reaction rates?
A)Monitor the mass or volume of gas produced over time
B)Record changes in pH over time
C)Measure electrical conductivity over time
D)All of the above
3
What type of apparatus can be used to monitor the change in concentration of H3O+ ions?
A)A pH meter
B)A thermometer
C)A pressure gauge
D)A spectrophotometer
4
Which of the following actions would not change the rate of a reaction?
A)Increasing the concentration of the reactants
B)Increasing the available surface area of a reactant
C)Using different reactants
D)None of the above
5
According to the kinetic molecular theory
A)all matter is made up of particles that are in constant motion
B)adding heat decreases the spacing between particles and increases their kinetic energy
C)adding heat increases the space between particles and decreases their kinetic energy
D)all matter is made up of motionless particles that begin to move when heat is applied
6
Which of the following is true, according to the collision theory?
A)Collisions between reactant particles are always elastic.
B)The addition of a catalyst increases the concentration of products at equilibrium.
C)Increasing the concentration of the reactant will increase the number of collisions per second.
D)The greater the surface area of the molecules, the smaller the number of collisions.
7
Which of the following criteria must a collision between two reactant particles satisfy to result in a reaction?
A)Correct orientation of and sufficient collision energy
B)Sufficient collision energy
C)Correct orientation of reactant particles
D)None of the above
8
Which of the following does a potential energy diagram not represent?
A)The potential energy change during a chemical reaction
B)The relative amounts of reactants and products involved in a chemical reaction
C)The difference in potential energy between reactants and products in a chemical reaction
D)The activation energy barrier of a reaction
9
Which statemen is true about potential energy diagrams?
A)They will not have a high activation energy barrier if the reaction is slow.
B)They do not show the transition state.
C)They indicate that a reaction is endothermic if the reactants appear lower than the products.
D)They will have a low activation energy barrier if the reaction is fast.





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