Rate of Chemical Reactions
Chemistry ⇒ Chemical Kinetics and Equilibrium
Rate of Chemical Reactions starts at 10 and continues till grade 12.
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See sample questions for grade 10
A student adds a catalyst to a reaction and observes that the reaction finishes in half the time. Has the catalyst changed the amount of product formed?
Describe how the presence of a catalyst affects the activation energy of a reaction.
Describe one way to measure the rate of a reaction that produces a gas.
Describe what is meant by the term 'instantaneous rate of reaction'.
A reaction mixture loses 0.5 g in 10 seconds. What is the average rate of mass loss in g/s?
A reaction produces 24 mL of gas in 2 minutes. What is the average rate of gas production in mL/min?
A reaction produces 60 mL of gas in 3 minutes. What is the average rate of gas production in mL/min?
A student adds a catalyst to a reaction and observes that the reaction finishes in half the time. Has the catalyst changed the amount of product formed?
In a reaction between magnesium and hydrochloric acid, which of the following would increase the rate of hydrogen gas production?
(1) Using larger pieces of magnesium
(2) Using more concentrated hydrochloric acid
(3) Lowering the temperature
(4) Adding water to the acid
Which of the following best describes activation energy?
(1) The energy released during a reaction
(2) The minimum energy required for a reaction to occur
(3) The energy absorbed by the products
(4) The energy of the reactants
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 graphs best represents the rate of a reaction over time?
(1) A straight line increasing
(2) A curve that decreases and levels off
(3) A straight line decreasing
(4) A curve that increases and levels off
A catalyst increases the rate of a chemical reaction by ________ the activation energy.
The minimum energy required for a reaction to occur is called ________.
The rate of a chemical reaction is usually expressed in units of ________ per unit time.
The rate of a reaction can be increased by increasing the ________ of the reactants in solution.
True or False: A catalyst is consumed during a chemical reaction.
True or False: All collisions between reactant particles result in a chemical reaction.
True or False: Increasing the concentration of reactants generally increases the rate of reaction.
True or False: Increasing the pressure of a gas-phase reaction increases the rate of reaction.
