How varying the concentration of Hydrogen Peroxide changes the rate at which an alginate bead reacts in Calcium Chloride.

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Biology Coursework

Title:

How varying the concentration of Hydrogen Peroxide changes the rate at which an alginate bead reacts in Calcium Chloride.

Equations:

In this experiment I am investigating the reaction:

                                                                                       

         2H2O2                                                               2H2O + O2

Hydrogen   Peroxide                         Water + Oxygen

Aim:

I am going to try and find out how varying the concentration of Hydrogen peroxide changes the time it takes for the yeast alginate ball to rise from the bottom of the test tube with different concentrations of Calcium Carbonate and Water. Normally the decomposition of hydrogen peroxide takes a long time, but the catalyse will speed up the reaction.

Introduction:

Catalyse breaks down the Hydrogen Peroxide into water and Oxygen. We are measuring the production of Oxygen because it is a visible reaction, whist Hydrogen and Water are both clear fluids, so it would be impossible to see the actual reaction occurring. During the production of Oxygen, Oxygen sticks to the beads and cause them to rise to the surface.

Enzymes are useful because they are catalyses and speed up the reaction. The basic mechanism by which enzymes catalyse chemical reactions begins with the binding of the substrate (or substrates) to the active site on the enzyme. The active site is the specific region of the enzyme which combines with the substrate. The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy. Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme).

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Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur. Increasing the concentration (in solution).

Increasing the concentration of a substance in solution means that there will be more particles per dm3 of that substance. The more particles that there are, the more will  per second, and so the rate of the reaction increases

Activation energy: the minimum energy necessary to form an  in a reaction.

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Results:

For preliminary work, I set up the apparatus up as show in the ...

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