Factors Affecting Reaction Rate
Chemistry ⇒ Chemical Kinetics and Equilibrium
Factors Affecting Reaction Rate starts at 10 and continues till grade 12.
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See sample questions for grade 11
A reaction between hydrogen and oxygen is slow at room temperature but becomes explosive at high temperatures. Explain why.
A reaction has an activation energy of 50 kJ/mol. If a catalyst lowers the activation energy to 30 kJ/mol, what is the effect on the reaction rate?
A reaction is carried out at 25°C and then at 35°C. The rate of reaction increases. This is mainly due to:
A reaction mixture is heated from 20°C to 40°C. Predict the effect on the rate of reaction.
A gaseous reaction is carried out in a closed container. Predict and explain the effect on the reaction rate if the volume of the container is halved, assuming temperature remains constant.
A student observes that a reaction between sodium thiosulfate and hydrochloric acid proceeds faster when the concentration of hydrochloric acid is doubled. Which factor affecting reaction rate does this observation illustrate?
Consider the decomposition of hydrogen peroxide (H2O2) in the presence and absence of manganese dioxide (MnO2) as a catalyst. Describe how the presence of MnO2 changes the reaction profile diagram and explain the effect on the rate of reaction.
The rate constant (k) for a reaction increases from 0.02 s-1 to 0.08 s-1 when the temperature is raised from 300 K to 320 K. Using the Arrhenius equation, explain what this indicates about the activation energy of the reaction.
Which factor is most likely to affect the rate of a reaction involving only gases?
(1) Surface area
(2) Pressure
(3) Color
(4) Odor
Which of the following factors does NOT affect the rate of a chemical reaction?
(1) Temperature
(2) Pressure
(3) Color of reactants
(4) Concentration
Which of the following factors does NOT affect the rate of a reaction between two aqueous solutions?
(1) Temperature
(2) Concentration
(3) Surface area
(4) Catalyst
Which of the following is NOT a way to increase the rate of a reaction?
(1) Increase temperature
(2) Increase reactant concentration
(3) Decrease surface area
(4) Add a catalyst
A reaction is found to proceed faster when the reactants are ground into a fine powder. This is due to an increase in _______.
Increasing the concentration of reactants generally _______ the rate of reaction.
The minimum energy required for a reaction to occur is called _______.
The rate of a reaction is directly proportional to the _______ of the reactants.
True or False: A catalyst increases the activation energy of a reaction.
True or False: Catalysts are consumed during the reaction.
True or False: Increasing the temperature always increases the rate of a chemical reaction.
True or False: The addition of a catalyst changes the enthalpy change (ΔH) of a reaction.
