• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating the affect of yeast concentration on the rate of reaction

Extracts from this document...


Investigating the affect of yeast concentration on the rate of reaction Aim: In this experiment I will investigate how the concentration of yeast affects the rate of reaction. Fair test: I will make sure it is a fair test by abiding to the list of measurements, I will use: 25ml of glucose and yeast solution 10% concentration of glucose - Yeast concentration varies Temperature at 37 C Also I will wash every piece apparatus that needs to be re-used thoroughly Apparatus: In my experiment I will need a variety of apparatus, I will need: 6 boiling tubes 1 delivery tube A water bath The specified amounts of glucose and yeast 5 pipettes A small amount of water A measuring cylinder A stop-clock I will set the experiment up as shown: Method: I will set up the apparatus as shown. ...read more.


At the end I plan to have 50 results in a result table and plot a graph of the average amount of bubbles for each different concentration. Prediction: I predict that the higher the concentration of yeast the more Carbon Dioxide bubbles there will be per minute. The more yeast you have the more active sites there are therefore there should be a lot more collisions giving off Carbon Dioxide bubbles. Also I expect that if you double the yeast concentration, the amount of CO bubbles will double as well. In my graph I predict there will be a strong positive correlation and that it will have a straight and steep line of best fit. ...read more.


Also the size of the bubble varied, some were huge and some were small. I recommended that in the future, for measuring the amount of a gas given off we measured the displacement of water. There were a few anomalies, most were too low and at the start of the investigation. I think that it must take a minute or two for the experiment to get going but I can't explain the ones that were too high or in the middle. Finally I noticed that some other colleagues were cheating and were tapping the delivery tube with stationary to increase the amount of CO bubbles. So, overall I am very pleased with my experiments and my investigation. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. What is the effect on the rate of respiration of yeast cells with glucose ...

    Procedure for actual experiment * Set up equipment and set the water bath to the desired temperature. * Using a weighing balance, measure out 25g of yeast and 12.5g of glucose in a 100ml beaker. Pour in 50ml of distilled water at 25�C and mix with a glass rod in a uniform manner.

  2. How temperature affects the rate of photosynthesis.

    To ensure fair test, the same test tube rack or test tube racks of the same material should have been used. Digital clock The digital clock was accurate to 0.01 seconds. This was a very reliable result as the degree of accuracy was high.

  1. Investigating The Fermentation of Yeast

    One tube gave off lots of bubbles but the other, for some reason didn't give off even half as much. At a guess I would say that the actual content of yeast in the yeast/water solution was greater in test tube two than in test tube two.

  2. Investigating respiration in aged yeast

    I collected the results at the same volume of carbon dioxide every time, so it will be easier to compare and analyse the results. The volumes registered are: 0.50 cm3, 2 cm3, 5 cm3 8 cm3, 9 cm3 and 10 cm3.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work