What is the role of a catalyst in a chemical reaction?
A) Increases the activation energy
B) Decreases the activation energy
C) Consumes reactants
D) Alters the reaction equilibrium
Which type of reaction absorbs heat energy from the surroundings?
A) Exothermic
B) Endothermic
C) Combustion
D) Redox
Which of the following is an example of a catalyst?
A) Sodium chloride
B) Platinum in a car’s catalytic converter
C) Oxygen gas
D) Water
Which factor does NOT affect the rate of a chemical reaction?
A) Temperature
B) Concentration
C) Surface area
D) Mass of reactants
What is the name of a reaction where two or more reactants combine to form a single product?
A) Decomposition
B) Synthesis
C) Combustion
D) Displacement
What happens to a catalyst after a chemical reaction?
A) It is consumed completely
B) It remains unchanged
C) It becomes part of the product
D) It dissolves in the reaction medium
Which type of catalyst speeds up a reaction without being in the same phase as the reactants?
A) Homogeneous catalyst
B) Heterogeneous catalyst
C) Enzyme catalyst
D) Autocatalyst
What kind of reaction involves the breaking down of a compound into simpler substances?
A) Synthesis
B) Decomposition
C) Displacement
D) Neutralization
Which law states that mass is conserved in a chemical reaction?
A) Law of Conservation of Energy
B) Law of Conservation of Mass
C) Law of Definite Proportions
D) Boyle’s Law
Which reaction type involves the exchange of elements between reactants?
A) Synthesis
B) Displacement
C) Decomposition
D) Combustion
Which factor increases the rate of a chemical reaction?
A) Decreasing temperature
B) Decreasing surface area
C) Increasing concentration
D) Removing the catalyst
Which process is an example of an exothermic reaction?
A) Melting ice
B) Boiling water
C) Condensation of steam
D) Burning fuel
Which chemical reaction releases energy in the form of light or heat?
A) Endothermic reaction
B) Decomposition reaction
C) Exothermic reaction
D) Neutralization reaction
Which of the following is a biological catalyst?
A) Enzyme
B) Platinum
C) Zinc
D) Carbon
Which catalyst is used in the Haber process to produce ammonia?
A) Nickel
B) Iron
C) Platinum
D) Copper
Which process involves a catalyst to speed up the decomposition of hydrogen peroxide?
A) Haber Process
B) Contact Process
C) Catalase Reaction
D) Polymerization
Which type of reaction occurs in a fuel cell?
A) Combustion
B) Redox
C) Neutralization
D) Synthesis
Which metal is commonly used as a catalyst in catalytic converters?
A) Copper
B) Iron
C) Platinum
D) Lead
What is the effect of a catalyst on a reaction’s activation energy?
A) Increases it
B) Decreases it
C) Eliminates it
D) Has no effect
Which type of catalyst is involved in biological processes?
A) Heterogeneous
B) Homogeneous
C) Enzyme
D) Acidic
Which chemical reaction type occurs when an acid reacts with a base?
A) Combustion
B) Synthesis
C) Neutralization
D) Decomposition
Which of the following increases the rate of reaction?
A) Increasing activation energy
B) Adding a catalyst
C) Decreasing temperature
D) Removing reactants
What is the catalyst used in the production of sulfuric acid via the Contact Process?
A) Iron
B) Vanadium(V) oxide
C) Platinum
D) Copper
What is the function of an enzyme in a biological reaction?
A) Slow down the reaction
B) Act as a reactant
C) Speed up the reaction
D) Change the reaction products
Which reaction involves oxygen and releases heat?
A) Combustion
B) Synthesis
C) Neutralization
D) Decomposition
What happens to a reaction rate if the temperature is increased?
A) It slows down
B) It remains unchanged
C) It speeds up
D) The reaction stops
What does a catalyst do in a reversible reaction?
A) Favors the forward reaction
B) Favors the backward reaction
C) Speeds up both forward and backward reactions
D) Stops the reaction
Which type of reaction involves the transfer of electrons?
A) Neutralization
B) Combustion
C) Redox
D) Decomposition
Which catalyst is used in hydrogenation of vegetable oils?
A) Iron
B) Nickel
C) Platinum
D) Copper
Which reaction produces carbon dioxide and water when hydrocarbons burn in oxygen?
A) Decomposition
B) Displacement
C) Combustion
D) Neutralization
