Biology Enzymes

GCSE: Biology

I think that the higher the concentration of Hydrogen Peroxide, the more bubbles will come out. The purer the Hydrogen Peroxide, the quicker the reaction rate. Because I am going to change the concentration of Hydrogen Peroxide after each experiment, I think that fewer bubbles will come out. This is because there will be less Hydrogen Peroxide in the beaker so there will be less to decompose.


I also think that if I double the Concentration, I will see twice the number of bubbles, and if I divide the Concentration by 2, I expect to see half the number of bubbles (e.g.-Concentration 2 molar, 36 bubbles, Concentration 1 molar, 18 bubbles). This can be seen in the graph below.











My Knowledge

Reactions happen all the time all around us e.g. a balloon bursting, a cake baking, an apple ripening and lighting a fire. Some of them are very slow, while some are very fast. Different reactions have different rates. The rate of a chemical reaction is the speed or time taken for it to happen.

The majority of chemical reactions are faster when the concentration is
higher. This is because at a higher concentration, the molecules in a substance have more kinetic energy, which means they will move around quicker. This makes it easier for them to react together. When more water is added, the liquid will become dilute. In this case, it also means that if the concentration is higher, there will be less water particles to block the hydrogen peroxide particles to meet up with the potatoes surface. Usually, if you double the concentration, you will half the reaction rate.

Hydrogen Peroxide

Hydrogen Peroxide is a chemical compound of hydrogen and oxygen. As explained in ‘My Investigation’, its scientific formula is H2O2. If this solution has not been altered and is pure and anhydrous, it is colourless, slightly thick and has a gravity of 1.44.

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