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