Reaction Rates Question Preview (ID: 46207)
Review Of Collision Theory And Reaction Rates.
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Collision Theory
a) Says chemical reactions occur through collisions between molecules
b) Is a theory that molecules collide when temperatures increase
c) States that more chemical reactions occur when molecules are cold
d) Says chemical reactions are not possible
When two molecules collide at low energy
a) No chemical reaction occurs
b) A chemical reaction occurs
c) The molecules switch places
d) The temperature drops
Which of the following will SPEED UP a chemical reaction?
a) Warmer Temp
b) Colder Temp
c) Lower Concentration
d) Remove a catalyst
Which of the following will SLOW down a chemical reaction?
a) Lower the concentration
b) Increase the concentration
c) Warmer Temperature
d) Add a catalyst
Why does a warm temp speed up chemical reactions?
a) Particles are moving faster so collisions have more energy
b) Particles are moving faster and are less likely to collide.
c) Particles are moving slower and collide more energy
d) Particles are moving slower and are less likely to collide
Why does higher concentration increase the speed of a chemical reaction?
a) Particles are more crowded are more likely to collide
b) Particles are more crowded and collide with less energy
c) Particles are spread apart and more likely to collide
d) Particles are spread apart and less likely to collide
What does a Catalyst do?
a) Increases the speed of a chemical reaction
b) Slows down a chemical reaction
c) Stops a chemical reaction
d) Makes to un-reactive chemicals reactive
Which of the following is most likely to occur in lab?
a) Dropping the temperature of Sodium Thiosulfate will slow down a reaction with HCl
b) Increasing the temperature of Sodium Thiosulfate will slow down a reaction with HCl
c) Increasing the concentration of Sodium Thiosulfate will slow down a reaction with HCl
d) Decreasing the concentration of Sodium Thiosulfate will speed up a reaction with HCl
What two things can change the rate of a chemical reaction?
a) Temperature and Concentration
b) Temperature and Sand
c) Sunlight and Sugar
d) Evaporation and Beakers
Which reaction time most likely corresponds to the highest temperature?
a) 5 seconds
b) 15 seconds
c) 300 seconds
d) 45 seconds
Which reaction time most likely corresponds to the lowest concentration of reactant?
a) 300 seconds
b) 5 seconds
c) 15 seconds
d) 45 seconds
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