869136
Pregunta 1
Pregunta
How can we measure the rate of a chemical reaction?
Respuesta
-
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
Pregunta 2
Pregunta
True or false? The rate of reaction can be found by the equation time/amount of reactant used or product formed.
Respuesta
- True
- False
Pregunta 3
Pregunta
Which theory states that reactions can only occur if reactants come into contact with one another?
Respuesta
-
Contact theory
-
Collision theory
-
Rutherford's theory of reaction
Pregunta 4
Pregunta
True or false? The activation energy is the smallest amount of energy needed for a reaction to take place.
Respuesta
- True
- False
Pregunta 5
Pregunta
Which factor increasing reaction rate would explain why a powder reacts more quickly than a lump of solid?
Respuesta
-
Temperature is higher
-
Concentration/Pressure is higher
-
There is a catalyst
-
Surface area is larger
Pregunta 6
Pregunta
Why do particles at high temperature react more frequently?
Respuesta
-
They are closer together
-
They collide more frequently
-
There are more exposed particles to react
-
They collide with more energy
Pregunta 7
Pregunta
True or false? If the reaction conditions are increased by 10°C, the rate of reaction will double.
Respuesta
- True
- False
Pregunta 8
Pregunta
True or false? Increasing the pressure lowers the rate of reaction as there are fewer particles in a given space.
Respuesta
- True
- False
Pregunta 9
Pregunta
Which of these is likely to have the highest rate of reaction?
Respuesta
-
1M H2SO4 + 1M KOH
-
2M H2SO4 + 1M KOH
-
0.5M H2SO4 + 1M KOH
Pregunta 10
Pregunta
True or false? Catalysts can only be used once.
Respuesta
- True
- False
Pregunta 11
Pregunta
What do catalysts do to speed up the rate of reaction?
Respuesta
-
Lower the activation energy
-
Provide an alternative route for the reaction
-
Give the particles more energy
-
Cause particles to collide more frequently
Pregunta 12
Pregunta
Which of these are being developed as potential new catalysts?
Respuesta
-
Nanoparticles
-
Polymers
-
Enzymes
-
Carboxylic acids
Pregunta 13
Pregunta
True or false? Although transition metals are useful catalysts, their compounds are often toxic.
Respuesta
- True
- False
Pregunta 14
Pregunta
True or false? Exothermic reactions make the surroundings colder.
Respuesta
- True
- False
Pregunta 15
Pregunta
Which of these are exothermic reactions?
Respuesta
-
Combustion
-
Respiration
-
Photosynthesis
-
Neutralisation
-
Thermal decomposition
Pregunta 16
Pregunta
Which of these are endothermic reactions?
Respuesta
-
Combustion
-
Respiration
-
Photosynthesis
-
Neutralisation
-
Thermal decomposition
Pregunta 17
Pregunta
True or false? A reversible reaction which is exothermic in the forward direction is exothermic in the backward direction.
Respuesta
- True
- False
Pregunta 18
Pregunta
True or false? Reversible reactions have exactly the same amount of energy lost or gained in both directions.
Respuesta
- True
- False
Pregunta 19
Pregunta
Which of these is an application of exothermic reactions?
Respuesta
-
Chemical cold packs
-
Hand warmers
Pregunta 20
Pregunta
Which of these is an application of endothermic reactions?
Respuesta
-
Chemical cold packs
-
Hand warmers
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