Physical Chemistry Quiz On Chemical Kinetics (5th semester)

A catalyst

• (a) Changes the free energy change of a reaction

• (b)is included in the balanced chemical equation for a reaction

• (c) Changes the mechanisms for a reaction

• (d)slows down the rate of a reaction

Which statement is not correct regarding the function of a catalyst?

• (a)It affects the rate of a chemical reaction

• (b)It lowers the energy of the product, causing the reaction to be more exothermic

• (c)It changes the mechanism of a reaction

• (d)It lowers the activation energy

The minimum amount of energy required to start a chemical reaction is called

• (a) Entropy

• (b) Activation energy

• (c) Enthalpy

• (d)Free energy

Which of the following includes all the aims of Kinetics?

(i) to measure the rate of a reaction

(ii) to be able to predict the rate of a reaction

(iii) to be able to establish the mechanism by which a reaction occurs

(iv) to be able to control a reaction

• (a) (i),(ii) and (iii)

• (b) (i) and (ii)

• (c) (i) and (iii)

• (d) (i),(ii),(iii) and (iv)

Reaction rates can change with

• (a) temperature

• (b) addition of catalyst

• (c) reactant concentration

• (d) all of these

Which factors affect the rate of a reaction?

• (a) temperature, pressure and humidity

• (b) temperature,reactant concentration and catalyst

• (c) temperature, reactant concentration and pressure

• (d) temperature, product concentration and container volume

In a series of reactions,which is the rate-determining step?

• (a) the simplest reaction

• (b) main reaction involving the major reactant

• (c) the slowest reaction

• (d) the fastest reaction

A reaction in which all reactants are in the same phase is called

• (a) elementary

• (b) bimolecular

• (c) Homogeneous

• (d) Heterogeneous

What happen in a steady state?

• (a) product is being formed faster than reactants regenerated

• (b) heat is evolved

• (c) concentration of an intermediate is constant

• (d) nothing is happening

Species that are form in one step of reaction mechanism and used up in another step are called

• (a) catalyst

• (b) intermediate

• (c) inhibitors

• (d) activated complex