AQA GCSE Chemistry Unit 2.4

Matthew T
Quiz by , created over 5 years ago

Twenty questions on the fourth section of Unit 2 in AQA GCSE Chemistry: Rates and energy.

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Matthew T
Created by Matthew T over 5 years ago
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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