This experiment is investigating one of the factors which affects the rate of fermentation of yeast.

Several factors affect the rate of reaction:

 Increasing the concentration. (See the lock and key theory.) If the substrate (glucose) is increased, then there would be more keys for the locks, therefore an increase in reactant concentration leads to an increase in reaction rate.

 The surface area, the bigger the surface area, the faster the reaction time is, as the reactant can reach more parts.

 The temperature, an increase in temperature leads to an increase in reactant rate. Generally, as the temperature is increased, the particles get more energy, so they bump into one another more, therefore speeding up the reaction time. This is called the collision theory, which I will discuss in greater depth later.

 Whether or not there is a catalyst. A catalyst speeds up the rate of reaction and remains chemically unchanged by the end of the experiment. A catalyst lowers the activation energy. This is the energy needed to start a reaction.

The variable that I have decided to change is the temperature. I have de

Enzymes are proteins that are BIOLOGICAL CATALYSTS. A catalyst is something that changes the rate of a chemical reaction without itself undergoing any change.

It will also be important not to agitate the solution at all, because this would cause collisions between particles, speeding up the reaction time and making the test unfair.

To extend my investigation, I could investigate the other factors affecting the rate of fermentation of yeast. I could also use another substrate and see what occurs.

There is a pattern in my results, as I have earlier explained, but it only occurs over the range of values that I have used, because the enzymes become denatured.

I will take 35 readings, over a range of 7 values, from nought to sixty, going up each time by 10 degrees Celsius. I will take three readings for each value, and then find the average, in order to be more accurate and reliable.

Some common words found in the essay are:
Fermentation Yeast, Analysis Results, BIOLOGICAL CATALYSTS, COLLISION THEORY, Carbon Dioxide, OPTIMUM TEMPERATURE, Delivery Tube, collision theory, reaction rate, rate chemical, carbon dioxide, chemical reaction, enzymes denatured, chemical reactions, enzymes enzymes, special shape, lock enzyme, rate chemical reaction, rate fermentation yeast, lock key theory, eventually reaching zero, 10 degrees celsius,
Approximate Word count = 2561
Approximate Pages = 10 (250 words per page double spaced)