Investigation in to the factors that affects the rate of fermentation of Glucose

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Investigation in to the factors that affects the rate of fermentation of Glucose

Aim:

To investigate the factors that affects the rate of fermentation of
Glucose.

Background knowledge.

ENZYMES

Fermentation is a form of an anaerobic respiration where by glucose is partially broken down so only a small amount of energy is released.
The yeast cells use the enzymes, ZYMASE to break down sugars unable to obtain. GLUCOSE CARBON DIOXIDE + ETHANOL(+ENERGY) C6 H12 O6 6CO2 + C2H5OH (210KJ)

Enzymes have several properties.

1) Specific actions-Zyamse in yeast works on glucose.

2) A small amount is required as the enzyme is used again and again as it is uncharged at the end therefore one of my variables could be varying the quantity of yeast.

3) Each enzyme has its own specific temperature at which it works best. This is the factor at which I am going to investigate zymase in yeast. There are some enzymes which work best in cold eg. Fridge. And others that can stand considerably high temperatures.

All enzymes are proteins as they are made by living cells. Therefore high temperatures cause protein to become DENATURED, destroyed, exaclty the same way as the cooked white of an egg cannot be changed back to its runny state. When proetin of an ezyme is denatured it no longer functions as a catalyst.

COLLISION THEORY

'Rate of reaction simply depends on how hard and often the reacting particles collide with each other.'

The basic idea is that particles have to collide with each other in order to react.

MORE COLLISIONS INCREASE THE RATE OF REACTION.

1) Temperature increases the number of collisions.

2) Concentration (or pressure) in creases the number of collisions.

3) Sizes of solid particles (or surface area) incr...

... middle of paper ...

...ature of 40-50°, therefore the molecules reacted faster and harder, collision theory, which starts to give off a gas, CO2. The glucose changes into a gas, Kinetic theory.

My graph of my results shows that the Carbon Dioxide produced did not react as fast as the enzyme which is working as a catalyst has either stopped or died. My prediction has been a success.

GLUCOSE CARBON DIOXIDE + ETHANOL(+ENERGY) C6 H12 O6 6CO2 + C2H5OH (210KJ)

Evaluation:

I really enjoyed doing this experiment, which is unusual! I did my research well. Using different types of materials, Internet, Library,
Revision books.

I think it would have been better if I had of done each temperature three times so that I could have found an average. It would have been abit more fairer and bit more accurate.

I also missed the first week so it was a little bit confusing at first but it turned out okay.

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