Реферат: Rates Of Reaction Essay Research Paper Rates

We can measure reactions in two ways:

1) Continuous:- Start the experiment and watch it happen; you can use a

computer ?logging? system to monitor it. I.e. Watching a colour fade or

increase.

2) Discontinuous:- Do the experiments and take readings/ samples from the

experiment at different times, then analyse the readings/samples to see how many

reactants and products are used up/ produced.

Reaction rate = amount of reactant used up

time taken

If the amount used up is the same each time then the only thing that changes is

the time taken.

so, reaction rate ? 1

time taken.

rate = K

time taken.

Where K is the constant for the reaction.

For particles to react:-

a) They have to collide with each other. b) They need a certain amount of

energy to break down the bonds of the particles and form new ones. This energy

is called the ?Activation Energy? or Ea.

When we increase the temperature we give the particles more energy which:

1) Makes them move faster which In turn makes them collide with each other more

often.

2) Increases the average amount of energy particles have so more particles have

the ?activation energy?

Both of these changes make the rate of reaction go up so we see a decrease in

the amount of time taken for the reaction and an increase in time taken.

= 1

Time taken reflects the rate of reaction.