Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Effect of Particle Size on Reaction Rate

No description
by

Safwan C Future

on 13 February 2016

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Effect of Particle Size on Reaction Rate

Effect of Particle Size on Reaction Rate
Chalk and Vinegar Experiment
For every sample:
Mass of chalk used - 10 g
Volume of vinegar used - 100 ml

The following video shows the equipment and procedure for the experiment
Video showing equipment and procedure
Explanation
Introduction
Changing the size of particles of reactants in a chemical reaction will change the rate of the reaction
Increasing particle size will reduce the surface area and reduce the rate of the reaction
Decreasing the particle size will increase surface area and increase the rate of the reaction
It must be noted that the mass of the particles must remain the same during observation, so valid results are obtained
Results
The following table shows the results of the reaction
Results
The following graph summarizes the results
As the particle size decreased, there is a decrease in the time for effervescence to complete, thus there is a decrease in the time taken for completion of reaction.

This means that the rate of the reaction increases as the surface area of the chalk increases.
Experiment 1
In this experiment, reaction between calcium carbonate and acetic acid is used
Chalk was used as a source of calcium carbonate
Vinegar was used as a source of acetic acid
Effervescence was due to the carbon dioxide produced in the reaction
Time for effervescence was measured because this marks the end of the reaction
The basic equation for the reaction is
As you observed, in this reaction also, decreasing particle size decreases the time taken for the reaction to complete
This means that the rate of reaction increased as we chopped up the tablet of the same mass
Results
The following table shows the results of the experiment
The following graph summarizes the results
Decreasing particle size
Another Experiment
In order to increase reliability of the statement that "Increased surface area increases rate of reaction", another experiment was carried out.
In this experiment, reaction between Calcium Carbonate and Ascorbic acid (and acetic acid) was observed
Vitamin C tablet was used as a source of calcium carbonate and ascorbic acid
Vinegar was used as a source of acetic acid
For every sample used:
mass of Vitamin C tablet - 8 g
volume of vinegar - 100 ml
Again, time for effervescence to complete was measured
The effervescence was due to the carbon dioxide produced in the reaction
The basic equation for the reaction are:

calcium carbonate+ascorbic acid --> calcium ascorbate+carbon dioxide+ water
calcium carbonate+acetic acid --> calcium acetate+carbon dioxide+ water

Decreasing particle size
Comparing the results
We can compare the graphs of the two experiments
As you can see, both results follow a similar pattern

In order for reactants to react, they must collide.
If there are more frequent and successful collisions, the rate of reaction is increased.
Increasing the particle size exposes greater surface area to the other reactant.
This means that there will be more collisions between the two reactants, which increases the rate of the reaction
min
Full transcript