The decomposition of hydrogen peroxide by yeast.

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GCSE SCIENTIFIC INVESTIGATION

BRISTOL CATHEDRAL

SCHOOL

THE DECOMPOSITION OF HYDROGEN PEROXIDE BY YEAST

ALEX GOSTELOW

11F

Skill Area P

Skill Area O

Skill Area A

Skill Area E

Comments

Planning

A Aim of the Experiment... what will you try to find out?

The decomposition of Hydrogen Peroxide by Yeast.

B Key Variables... all the different factors that can be changed.

Amount of Yeast

Amount of Hydrogen Peroxide

Temperature

PH

Time taken for decomposition to take place

Strength of Suspension

C Prediction

I predict that the more yeast that is put in the Hydrogen Peroxide the more violent the reaction will be; therefore giving off more oxygen. This is because of the reaction theory (the rate of a reaction depends on how often and how hard the reacting particles collide with each other. The particles have to collide to react). If the solution is made more concentrated it means there are more particles of reactant knocking about between the molecules which make the collisions between the important particles more likely.