869136
Question 1
Question
How can we measure the rate of a chemical reaction?
Answer
-
Measure the mass of products formed and the time taken
-
Measure the mass of reactants formed and the time taken
-
Use a device which measures rate
-
We cannot measure the rate of a reaction
Question 2
Question
True or false? The rate of reaction can be found by the equation time/amount of reactant used or product formed.
Answer
- True
- False
Question 3
Question
Which theory states that reactions can only occur if reactants come into contact with one another?
Answer
-
Contact theory
-
Collision theory
-
Rutherford's theory of reaction
Question 4
Question
True or false? The activation energy is the smallest amount of energy needed for a reaction to take place.
Answer
- True
- False
Question 5
Question
Which factor increasing reaction rate would explain why a powder reacts more quickly than a lump of solid?
Answer
-
Temperature is higher
-
Concentration/Pressure is higher
-
There is a catalyst
-
Surface area is larger
Question 6
Question
Why do particles at high temperature react more frequently?
Answer
-
They are closer together
-
They collide more frequently
-
There are more exposed particles to react
-
They collide with more energy
Question 7
Question
True or false? If the reaction conditions are increased by 10°C, the rate of reaction will double.
Answer
- True
- False
Question 8
Question
True or false? Increasing the pressure lowers the rate of reaction as there are fewer particles in a given space.
Answer
- True
- False
Question 9
Question
Which of these is likely to have the highest rate of reaction?
Answer
-
1M H2SO4 + 1M KOH
-
2M H2SO4 + 1M KOH
-
0.5M H2SO4 + 1M KOH
Question 10
Question
True or false? Catalysts can only be used once.
Answer
- True
- False
Question 11
Question
What do catalysts do to speed up the rate of reaction?
Answer
-
Lower the activation energy
-
Provide an alternative route for the reaction
-
Give the particles more energy
-
Cause particles to collide more frequently
Question 12
Question
Which of these are being developed as potential new catalysts?
Answer
-
Nanoparticles
-
Polymers
-
Enzymes
-
Carboxylic acids
Question 13
Question
True or false? Although transition metals are useful catalysts, their compounds are often toxic.
Answer
- True
- False
Question 14
Question
True or false? Exothermic reactions make the surroundings colder.
Answer
- True
- False
Question 15
Question
Which of these are exothermic reactions?
Answer
-
Combustion
-
Respiration
-
Photosynthesis
-
Neutralisation
-
Thermal decomposition
Question 16
Question
Which of these are endothermic reactions?
Answer
-
Combustion
-
Respiration
-
Photosynthesis
-
Neutralisation
-
Thermal decomposition
Question 17
Question
True or false? A reversible reaction which is exothermic in the forward direction is exothermic in the backward direction.
Answer
- True
- False
Question 18
Question
True or false? Reversible reactions have exactly the same amount of energy lost or gained in both directions.
Answer
- True
- False
Question 19
Question
Which of these is an application of exothermic reactions?
Answer
-
Chemical cold packs
-
Hand warmers
Question 20
Question
Which of these is an application of endothermic reactions?
Answer
-
Chemical cold packs
-
Hand warmers
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