Lesson 9.1.1
9.1.1 Collision theory and factors affecting rate Quiz: Pearson Edexcel Chemistry, Unit 9
20 questions
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Lesson 9.1.1, Collision theory and factors affecting rate: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 9: Kinetics I, written with Revision Ninja.
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The 20 questions
-
According to collision theory, what must colliding particles possess to react?
- High mass
- Equal speeds
- Activation energy
- Positive charge
-
What is the term for the minimum energy required for a successful collision?
- Bond enthalpy
- Enthalpy change
- Activation energy
- Kinetic energy
-
Why does increasing reactant concentration increase the rate of reaction?
- More frequent collisions
- Lower activation energy
- Higher particle speed
- More exothermic reaction
-
Why does increased temperature raise reaction rate?
- Collision frequency halves
- More particles exceed Ea
- Activation energy decreases
- Particles move slower
-
Why does increasing gas pressure increase the rate of reaction?
- Lower collision frequency
- Higher particle concentration
- Higher kinetic energy
- Lower activation energy
-
Why does increasing surface area of a solid increase reaction rate?
- Lower activation energy
- Higher particle speed
- Increased kinetic energy
- More exposed particles
-
Which value is used to compare rates when time taken is t?
- square root of t
- 1/t
- t
- t squared
-
What does the gradient of a tangent to a concentration-time graph represent?
- Instantaneous rate
- Average rate
- Activation energy
- Total yield
-
What is represented by a Maxwell-Boltzmann distribution curve?
- Collision frequency
- Activation energy
- Molecular energy distribution
- Reaction rate
-
How does raising temperature affect the Maxwell-Boltzmann curve peak?
- Stays identical
- Shifts right and up
- Shifts right and down
- Shifts left and up
-
Why does a small temperature increase roughly double many reaction rates?
- Pressure doubles instantly
- Activation energy drops significantly
- Molecules become smaller
- Many more exceed Ea
-
Which property does not affect the rate of a reaction?
- Reactant concentration
- Surface area
- Reaction temperature
- Enthalpy change
-
Why does increasing concentration speed up a reaction?
- Lower activation energy
- Larger particle size
- Higher average velocity
- More particles per volume
-
How is initial rate found from a concentration-time graph?
- Tangent at completion
- Area under graph
- x-axis intercept
- Tangent at t = 0
-
What does a flattening concentration-time graph gradient indicate?
- Reaction has reversed
- Rate is increasing
- Rate is decreasing
- Rate is constant
-
Why do powdered solids react faster than large lumps?
- Higher collision energy
- Lower activation energy
- Higher concentration
- Greater surface area
-
How does increasing pressure affect gas molecules in fixed volume?
- Increased molecule size
- Lower activation energy
- Lower kinetic energy
- Higher concentration
-
What requirement besides sufficient energy is needed for successful collision?
- Presence of catalyst
- High temperature
- Correct orientation
- High pressure
-
What is the minimum energy required for a chemical reaction to occur?
- Activation energy
- Bond energy
- Lattice energy
- Enthalpy change
-
Which change decreases the rate of reaction between magnesium and hydrochloric acid?
- Powdering the magnesium
- Heating the acid
- Increasing acid concentration
- Diluting the acid
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