Question 1
Question
How can we measure the rate of a chemical reaction?
Answer
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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
Question 2
Question
True or false? The rate of reaction can be found by the equation time/amount of reactant used or product formed.
Question 3
Question
Which theory states that reactions can only occur if reactants come into contact with one another?
Question 4
Question
True or false? The activation energy is the smallest amount of energy needed for a reaction to take place.
Question 5
Question
Which factor increasing reaction rate would explain why a powder reacts more quickly than a lump of solid?
Question 6
Question
Why do particles at high temperature react more frequently?
Answer
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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
Question 7
Question
True or false? If the reaction conditions are increased by 10°C, the rate of reaction will double.
Question 8
Question
True or false? Increasing the pressure lowers the rate of reaction as there are fewer particles in a given space.
Question 9
Question
Which of these is likely to have the highest rate of reaction?
Answer
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1M H2SO4 + 1M KOH
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2M H2SO4 + 1M KOH
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0.5M H2SO4 + 1M KOH
Question 10
Question
True or false? Catalysts can only be used once.
Question 11
Question
What do catalysts do to speed up the rate of reaction?
Answer
-
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
Question 12
Question
Which of these are being developed as potential new catalysts?
Answer
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Nanoparticles
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Polymers
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Enzymes
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Carboxylic acids
Question 13
Question
True or false? Although transition metals are useful catalysts, their compounds are often toxic.
Question 14
Question
True or false? Exothermic reactions make the surroundings colder.
Question 15
Question
Which of these are exothermic reactions?
Answer
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Combustion
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Respiration
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Photosynthesis
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Neutralisation
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Thermal decomposition
Question 16
Question
Which of these are endothermic reactions?
Answer
-
Combustion
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Respiration
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Photosynthesis
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Neutralisation
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Thermal decomposition
Question 17
Question
True or false? A reversible reaction which is exothermic in the forward direction is exothermic in the backward direction.
Question 18
Question
True or false? Reversible reactions have exactly the same amount of energy lost or gained in both directions.
Question 19
Question
Which of these is an application of exothermic reactions?
Answer
-
Chemical cold packs
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Hand warmers
Question 20
Question
Which of these is an application of endothermic reactions?
Answer
-
Chemical cold packs
-
Hand warmers