WorksheetsCatalysts
Total questions: 10
Worksheet time: 5mins
What is the main function of a catalyst in a chemical reaction?
Increase the temperature of the system
Lower the activation energy
Increase the energy of the reactants
Increase the concentration of products
How does a catalyst increase the rate of a chemical reaction?
By changing the enthalpy of the products
By increasing particle collisions
By providing an alternative reaction pathway with a lower activation energy
By raising the temperature
Which of the following is true about a catalyst?
It is consumed in the reaction
It increases the activation energy
It alters the position of equilibrium
It can be recovered chemically unchanged at the end of the reaction
In a potential energy diagram, the presence of a catalyst is shown by:
A lower reactant energy level
A lower activation energy peak
A higher product energy level
A lower product energy level
Which type of catalyst works by adsorbing reactants onto its surface?
Biological catalyst
Homogeneous catalyst
Enzyme catalyst
Heterogeneous catalyst
Why are transition metals often used as catalysts?
They are highly reactive
They have low melting points
They can form variable oxidation states and complex ions
They do not form compounds
In catalytic converters used in cars, platinum acts as a catalyst to:
Lower fuel consumption
Convert nitrogen to ammonia
Convert harmful gases like CO and NO into less harmful substances
Increase the temperature of the engine
Which of the following is not a correct statement about catalysts?
Catalysts reduce the energy required for a reaction to proceed
Catalysts take part in the reaction mechanism
Catalysts alter the overall enthalpy change of the reaction
Catalysts are not used up during the reaction
Which of the following best explains why only a small amount of catalyst is needed?
Catalysts are very expensive
Catalysts only work at high temperatures
Catalysts are not used up during the reaction
Catalysts are difficult to obtain
Which industrial process uses iron as a catalyst?
Contact process
Haber process
Fermentation
Cracking of hydrocarbons
