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