In the zero-order rate law equation, what does [A] represent?

• A) Time
• B) Initial concentration of the reactant
• C) Concentration of the reactant at any time t
• D) Rate constant

If the rate constant (k) for a zero-order reaction is 0.5 M/s and the initial concentration of the reactant is 1.0 M, what will be the rate of the reaction?

• A) 1.0 M/s
• B) 2.0 M/s
• C) 1.5 M/s
• D) 0.5 M/s

How is the graph of concentration against time for a zero-order reaction described?

• A) Parabolic
• B) Exponential
• C) No change in concentration with time
• D) Linear

In Arrhenius equation Ea is

• A) Access Energy
• B) Energy of Tolrance
• C) Activation Energy
• D) Zero Energy

In a chemical reaction, the transition state is defined as the _____________energy state of the system.

• A) lowest
• B) Highest
• C) Critical
• D) Constant

The Arrhenius equation can be used to determine the effect of a change of ____________on the rate constant.

• A) Temperature
• B) Pressure
• C) Initial concentration
• D) Concentration

Chemical reactions occur more rapidly at

• A) Lower Temperatures
• B) Lower Pressure
• C) Higher temperatures
• D) Higher pressure

Enzymes can be thought of as biological catalysts that __________activation energy.

• A) Lower
• B) maximize
• C) increase
• D) none of these

____________shows how the concentration of species changes over time.

• A) Integrated rate equation
• B) order of reaction
• C) mole fraction
• D) differential rate law

Activation enthalpy, ΔH‡, represents the difference in energy between the ground state and the ___________ in a chemical reaction.

• A) Final state
• B) none of these
• C) Critical state
• D) Transition state

In a pseudo-first-order reaction, if the concentration of the excess reactant is doubled, how does this affect the reaction rate?

• A) The reaction rate remains unchanged
• B) The reaction rate increases linearly
• C) The reaction rate doubles
• D) The reaction rate quadruples

Arrhenius performed experiments that correlated chemical reaction rate constants with

• A) Comcentration
• B) Volume
• C) Pressure
• D) Temperature

The pseudo first order reaction involves treating a _________reaction like a first order reaction

• A) second order
• B) zero order
• C) none of these
• D) third order

Formation of double stranded DNA from two complementary strands is ______order reaction.

• A) second
• B) third
• C) zero
• D) first

Half life of second order reactions depends on the _________and the rate constant.

• A) product formed
• B) time consumed
• C) initial concentration
• D) none of these

Which statement accurately describes the graphical representation of a zero-order reaction?

• A) Exponential decrease of concentration with time
• B) Parabolic decrease of concentration with time
• C) Linear decrease of concentration with time
• D) Concentration remains constant with time

The concepts of half life plays a key role in the administration of

• A) Enzymes
• B) Food
• C) Drugs
• D) Pesticides

When the reaction is at equilibrium ΔG?

• A) ΔG>1
• B) ΔG>0.
• C) ΔG<0
• D) ΔG=0.

In zero order reaction the rate of the reaction is equal to ________of that reaction.

• A) rate constant
• B) concentration
• C) rate law
• D) exponents of concentration terms

Pseudo-first-order kinetics are commonly observed in reactions where:

• A) One reactant concentration is significantly higher than the other
• B) Reactants have different orders
• C) Both reactants are present in equal amounts
• D) The rate constant is zero