Catalysts in Chemical Reactions
Chemistry ⇒ Chemical Reactions and Equations
Catalysts in Chemical Reactions starts at 9 and continues till grade 12.
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A student adds manganese dioxide to hydrogen peroxide and observes rapid bubbling. What is the role of manganese dioxide in this reaction?
Describe how a catalyst affects the rate of a chemical reaction.
Describe the role of a catalyst in the contact process for making sulfuric acid.
Describe what happens to a catalyst at the end of a chemical reaction.
Describe what is meant by 'catalyst poisoning'.
Explain the difference between a homogeneous and a heterogeneous catalyst.
Explain why a catalyst does not affect the amount of product formed in a chemical reaction.
A student adds manganese dioxide to hydrogen peroxide and observes rapid bubbling. What is the role of manganese dioxide in this reaction?
Which of the following best describes the effect of a catalyst on activation energy?
(1) Increases activation energy
(2) Decreases activation energy
(3) Has no effect on activation energy
(4) Removes activation energy completely
Which of the following is a common catalyst used in the catalytic converter of cars?
(1) Platinum
(2) Iron
(3) Zinc
(4) Sodium
Which of the following is a property of enzymes?
(1) They are inorganic catalysts.
(2) They work best at specific temperatures and pH levels.
(3) They are used up in reactions.
(4) They slow down reactions.
Which of the following is an example of a catalyst in a biological system?
(1) Amylase
(2) Iron
(3) Platinum
(4) Copper
Fill in the blank: Catalysts work by lowering the __________ energy required for a reaction to occur.
Fill in the blank: Enzymes are __________ catalysts found in living organisms.
Fill in the blank: The catalyst used in the conversion of alkenes to alkanes is usually __________.
Fill in the blank: The catalyst used in the conversion of ethene to ethanol is __________ acid.
True or False: A catalyst can be recovered unchanged at the end of a chemical reaction.
True or False: Catalysts are always required for a chemical reaction to occur.
True or False: Catalysts are always solids.
True or False: Catalysts can be either solid, liquid, or gas.
