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Chemistry Controlled Assessment
Strand S (a)


Chemical reactions can be split up into two main types: exothermic and endothermic. An exothermic
reaction releases heat into the environment. This is due to the amount of activation energy that is
needed to carry out the reaction being smaller than the…

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When an acid reacts with an alkali the products it makes are a salt and water. This is known as the
neutralisation reaction. Most neutralisation reactions are exothermic and can be written like so:

Here Y and X represent a monovalent cation and anion
respectively. The OH splits apart from…

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For my investigation I will be studying the effects of different molarities of acids and bases on the
energy given out in a reaction. I choose to study this factor over others for a number of reasons; firstly it
will be the easiest, out of all the factors that I…

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concentrations like normal tap water does. By using distilled I will be able to avoid side reactions
and contamination of my reactants and if there is an unexpected result in my data I will be able
to know that it s directly linked to my experiment and not something in…

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sodium hydroxide gets into the eyes,
wash out and immediately seek
medical help.
Corrosion or irritation of Hydrochloric acid ­ it is a Take care when handling the
skin corrosive acid that can corrode hydrochloric acid, try not to spill it. Do
or irritate skin if left untreated not run…

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occurred during one of our experiments then we would repeat the same experiment in order to make
sure that it was an anomaly and retrieve a set of data that is more reliable.

From our preliminary experiment we decided to keep the total volume of the solution constant and to…


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