Реферат: Rates Of Reaction Essay Research Paper Rates

not explain by how much or by how fast the rate increases. The Kinetic energy of

a particle is proportional to its absolute (Kelvin) temperature.

1/2 mv2? T

But the mass of the particles remains constant so we can eliminate that part of

the equation so;

? V2?T

Therefore we can fit this into a formula:

V21/V22 = T1/T2

If we substitute the temperature into the formula we can work out the average

speed of the formula:

V21/V22 = 310/300

\V 1= ?310/300V 2

= ?1.033V2

= 1.016V2

However if we look at this it is only 1.016 times greater than the speed at

300K, in other words we can see that it has only increased by 1.6%.

The frequency of the collisions depends on the speed of the particles, this

simple collision theory only accounts for the 1.6% increase in the rate, but in

practice the reaction rate roughly doubles in a 10K rise, so this simple theory

cannot account for an 100% increase in the reaction rate.

During a chemical reaction the particles have to collide with enough energy to

first break the bonds and then to form the new bonds and the rearranged

electrons, so it is ?safe? to assume that some of the particles do not have

enough energy to react when they collide.

The minimum amount of energy that is needed to break down the bonds is called

the activation energy (EA). If the activation energy is high only a small

amount of particles will have enough energy to react so the reaction rate would

be very small, however, if the activation energy is very low the number of

particles with that amount of energy will be high so the reaction rate would be