# A Level Biology watch

1. What would be the step by step method for investigating how concentration of catalase affects the rate of reaction of the decomposition of hydrogen peroxide?
2. Sorry you've not had any responses about this. Are you sure you’ve posted in the right place? Posting in the specific Study Help forum should help get responses.

I'm going to quote in Tank Girl now so she can move your thread to the right place if it's needed.

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What would be the step by step method for investigating how concentration of catalase affects the rate of reaction of the decomposition of hydrogen peroxide?
You need...
a method of measuring the rate of reaction
decide what concentrations you will test
to think about which factors you might need to keep the same so they don't affect the rate (e.g. temp).

Not a comprehensive list but it is a starting point.

(I did this for my GCSE biology coursework so feel free to ask)
What would be the step by step method for investigating how concentration of catalase affects the rate of reaction of the decomposition of hydrogen peroxide?
You need to identify what your concentration range would be. ex: 0.1, 0.2, 0.3 moldm^-3
Since h202(hydrogen peroxide) decomposes to give oxygen and hydrogen, you need a means of identifying the amount given out.
this can be possible by connecting the reaction vessel (beaker with h202 and catalase) to a gas syringe. hence, when the experiment takes place, over time the gas syringe would be filled with the volume of 02 and h2.

your independent variable is your conc of catalase and your dependent variable would be the volume of gas in the syringe.
therefore, these two variables are the only two variables which should change. every other variable including temp and light intensity. In case you didnt know, h202 decomposes in light to give the above mentioned products.

after you get your initial set of results, you can repeat the experiment atleast 3 times to obtain the average volume of gas for each concentration. next, you can plot a graph of conc of catalase on the x axis and volume of gas on the y axis.

if there is anything unclear, please message me. happy to help

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