Chemistry Investigation :: essays research papers

Investigate A Factor Which Affects the Rate Of Fermentation Of YeastThis experiment is investigating one of the factors which restores the rate of fermentation of yeast.Several factors affect the rate of reaction&61656 Increasing the concentration. (See the lock and key theory.) If the substrate (glucose) is gaind, then there would be more keys for the locks, therefore an append in reactant concentration leads to an increase in reaction rate.&61656 The surface area, the bigger the surface area, the faster the reaction time is, as the reactant can reach more parts.&61656 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 allow discuss in greater depth later. &61656 Whether or not there is a catalyst. A catalyst speeds up the rate of reaction and remains c hemically un flipd 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 decided to alter the temperature of the yeast and time the amount of carbon dioxide that pass on be given off at different temperatures. I have decided to time how much carbon dioxide is given off in five minutes.Throughout the investigation, I will keep the temperature the same as I have specified for each reading. For example, if I am taking a reading in which the temperature must be 5 degrees, I will make sure that the yeast is kept at this temperature. When I am altering the temperature of the yeast, I will place it in a water clean of the specified temperature, which makes the temperature much more accurate. For example, if I heat up the yeast using a Bunsen burner, I could heat it up too much, thereby denaturing the enzymes and ruining the experiment. After the enzymes hav e been denatured, they can no longer react.It will also be important not to agitate the solution at all, be energise this would cause collisions between particles, speeding up the reaction time and making the test unfair.While doing an experiment such as this, it is vital to be safe at all times. You should stand up at all times, making sure that stools are firmly under desks.