Chemistry Investigation :: essays research papers

Investigate A Factor Which Affects the Rate Of Fermentation Of yeastThis experiment is investigating one of the factors which displaces 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 increased, then on that point would be more keys for the locks, thence an increase in reactant concentration leads to an increase in reaction rate.&61656 The surface area, the large the surface area, the faster the reaction time is, as the reactant can get to more parts.&61656 The temperature, an increase in temperature leads to an increase in reactant rate. Gener all(prenominal)y, 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 pass on establish in greater depth later. &61656 Whether or not there is a catalyst. A catalyst speeds up the rate of reaction and trunk 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 piss decided to change is the temperature. I have decided to alter the temperature of the yeast and time the amount of carbon dioxide that will be given sullen at different temperatures. I have decided to time how often carbon dioxide is given off in five minutes.Throughout the investigation, I will keep the temperature the same as I have contract for each reading. For example, if I am taking a reading in which the temperature must be 5 degrees, I will make certain(p) that the yeast is kept at this temperature. When I am altering the temperature of the yeast, I will place it in a water bath of the condition temperature, which makes the temperature much more accurate. For example, if I heat up the yeast utilize a Bunsen burner, I could heat it up too much, thereby denaturing the enzymes and ruining the experiment. After the enzymes have been denatured, they can no longer react.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 make 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.