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Reaction Rates
Test Description: S2 Reaction Rates revision
Instructions: Answer all questions to get your test result.
1) A catalyst...
A
Speeds up the rate of a reaction and must be replaced at the end of an experiment
B
Slows down the rate of reaction without being used up
C
Is the thing a cat makes before it goes shopping
D
Speeds up the rate of a reaction without being used up
2) Why does reaction rate increase as the temperature increases?
A
There are more particles at higher temperatures, so they collide more
B
At higher temperatures particles move faster and collide more often
C
Particles begin to collide at higher temperatures
D
The particles have less energy when the temperature is increased
3) Why does reaction rate increase as the concentration increases?
A
The particles have more energy so there are more collisions
B
There are more particles so there are more collisions
C
The particles are moving faster
D
The surface area is increased so there are more collisions
4) Which of the following does NOT increase the rate of a reaction?
A
Increasing the size of reactant particles
B
Increasing the temperature of reactants
C
Increasing the concentration of reactants
D
Using a catalyst
5) Which of the following statements about collisions is correct?
A
Reactions can happen if the colliding particles have enough energy
B
Particles do not need to collide before they react
C
Only fast-moving particles collide with each other
D
All colliding particles have the same amount of energy
6) How could I make the reaction between acid and marble chips faster?
A
Have a smaller surface area of marble
B
Use a lower temperature
C
Use a lower acid concentration
D
Use smaller marble chips
7) Catalysts do not need to be replaced frequently because
A
they are dangerous
B
they do not do anything
C
they are not used up in a reaction
D
they are very expensive
8) Experiment A uses excess acid and 5g of chalk powder, experiment B uses excess acid and 10g of chalk powder
A
Experiment A would be faster
B
More product would be made in experiment B
C
Experiment B would be faster
D
Experiment C would be faster
9) To make an experiment a fair test you must
A
repeat the experiment at least twice
B
only change one variable at a time while keeping all other conditions the same
C
change all variable except one
D
measure everything carefully
10) 2 experiments using chemicals A and B are carried out. Reaction A finishes after 95 seconds and reaction B finishes after 1 minute 35 seconds. Which of the following is correct.
A
Both reactions occurred at the same speed.
B
Reaction A was faster
C
Reaction C was faster
D
Reaction B was faster
*select an answer for all questions
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