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Reaction Rates
Test Description: Review of Collision Theory and Reaction Rates
Instructions: Answer all questions to get your test result.
1) Collision Theory
A
States that more chemical reactions occur when molecules are cold
B
Says chemical reactions occur through collisions between molecules
C
Says chemical reactions are not possible
D
Is a theory that molecules collide when temperatures increase
2) When two molecules collide at low energy
A
A chemical reaction occurs
B
The temperature drops
C
The molecules switch places
D
No chemical reaction occurs
3) Which of the following will SPEED UP a chemical reaction?
A
Colder Temp
B
Lower Concentration
C
Remove a catalyst
D
Warmer Temp
4) Which of the following will SLOW down a chemical reaction?
A
Increase the concentration
B
Add a catalyst
C
Warmer Temperature
D
Lower the concentration
5) Why does a warm temp speed up chemical reactions?
A
Particles are moving faster so collisions have more energy
B
Particles are moving slower and are less likely to collide
C
Particles are moving faster and are less likely to collide.
D
Particles are moving slower and collide more energy
6) Why does higher concentration increase the speed of a chemical reaction?
A
Particles are spread apart and more likely to collide
B
Particles are spread apart and less likely to collide
C
Particles are more crowded and collide with less energy
D
Particles are more crowded are more likely to collide
7) What does a Catalyst do?
A
Slows down a chemical reaction
B
Increases the speed of a chemical reaction
C
Stops a chemical reaction
D
Makes to un-reactive chemicals reactive
8) Which of the following is most likely to occur in lab?
A
Increasing the concentration 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
Dropping the temperature of Sodium Thiosulfate will slow down a reaction with HCl
D
Decreasing the concentration of Sodium Thiosulfate will speed up a reaction with HCl
9) What two things can change the rate of a chemical reaction?
A
Temperature and Concentration
B
Evaporation and Beakers
C
Sunlight and Sugar
D
Temperature and Sand
10) Which reaction time most likely corresponds to the highest temperature?
A
15 seconds
B
45 seconds
C
5 seconds
D
300 seconds
11) Which reaction time most likely corresponds to the lowest concentration of reactant?
A
45 seconds
B
5 seconds
C
15 seconds
D
300 seconds
*select an answer for all questions
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