Chemical Kinetics

Particle size of reactants

Temperature

Volume of the reaction vessel for solids

Activation energy

By calculating the slope of the tangent at a particular time point on the concentration-time curve

By calculating the area under the concentration-time curve

By taking the average of the initial and final concentrations

By calculating the slope of a line connecting the start and end points of the reaction

$mol\ L^{-1}\ s^{-1}$

$mol^{-1}\ L\ s^{-1}$

$mol\ L\ s$

$s^{-1}$

Fine powder of $CaCO_3$

Large marble chips of $CaCO_3$

Small pebbles of $CaCO_3$

A single large crystal of $CaCO_3$

Increasing the enthalpy change ($\Delta H$) of the reaction.

Increasing the average kinetic energy of the reactant molecules.

Increasing the threshold energy of the reaction.

Providing an alternative reaction mechanism with a lower activation energy.

A decrease in the activation energy of the reaction.

An increase in the total number of collisions per unit volume.

A significant increase in the fraction of molecules possessing energy equal to or greater than the activation energy.

An increase in the value of the gas constant $R$.

$-k$

$-k / 2.303$

$k / 2.303$

$-2.303 / k$

$-k$

$k$

$ln[R]_0$

$[R]_0$

It is doubled

It remains unchanged

It is halved

It increases fourfold

$1^{\circ}C$

$5^{\circ}C$

$100^{\circ}C$

$10^{\circ}C$

$-E_a / R$

$-E_a / 2.303R$

$E_a / R$

$\ln A$

The total number of collisions per unit volume per unit time.

The energy barrier that must be overcome by reactants.

The fraction of successful collisions at a given temperature.

The rate at which the concentration of products increases.

The total number of collisions

The fraction of molecules with kinetic energy greater than $E_a$

The orientation or steric factor

The rate constant of the reaction

The fraction decreases

The fraction increases

The fraction remains constant

The fraction becomes zero

Only collision is required

Only energy is required

Both sufficient energy and proper orientation are required during collision

Neither orientation nor energy is necessary if the collision is frequent