Rates of Reaction: MCQ2

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What is the purpose of manganese dioxide in the breakdown of hydrogen peroxide?

To act as a catalyst to speed up the reaction (correct)

To alter the particle size of the reactants

To decrease the temperature of the reaction

To increase the concentration of oxygen

What is the definition of a catalyst?

A substance that alters the rate of a chemical reaction and is chemically changed at the end of the reaction

A substance that alters the rate of a chemical reaction, but is chemically unchanged at the end of the reaction (correct)

A substance that slows down the rate of a chemical reaction

A substance that increases the activation energy of a reaction

What is the term for the minimum energy required for colliding particles to react?

Catalyst energy

Reaction rate

Particle energy

Activation energy (correct)

What type of catalysis involves a catalyst in a different physical phase to the reactants?

Heterogeneous catalysis Signup and view all the answers

What is the term for the rate at a particular point in time during a reaction?

Instantaneous rate Signup and view all the answers

What is the equation for the breakdown of hydrogen peroxide?

H2O2 → H2O + ½ O2 Signup and view all the answers

What is the term for the change in concentration of any one reactant or product in unit time?

Rate of reaction Signup and view all the answers

What type of catalysis is involved in the intermediate formation theory?

Homogeneous catalysis Signup and view all the answers

What is the primary role of a catalyst in a chemical reaction?

To lower the activation energy of the reaction Signup and view all the answers

What is the term for a collision that results in product formation?

Effective collision Signup and view all the answers

What is the term for the accumulation of one substance at the surface of another?

Adsorption Signup and view all the answers

What is the term for substances that can block active sites on a catalyst, reducing its effectiveness?

Catalytic poisons Signup and view all the answers

How does the surface area of a catalyst affect the reaction rate?

A larger surface area increases the reaction rate Signup and view all the answers

What is the term for the energy barrier that must be overcome for a reaction to occur?

Activation energy Signup and view all the answers

What is the relationship between concentration and rate in a chemical reaction?

Concentration is directly proportional to rate Signup and view all the answers

What is the type of catalysis that occurs when the reactants are gases and the catalyst is a solid?

Heterogeneous catalysis Signup and view all the answers

What is the term for the rate of reaction found by drawing a tangent to the curve at a point?

Instantaneous rate of reaction Signup and view all the answers

Rates of Reaction: MCQ2

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