Welling School
BTEC First Certificate and Diploma in
Applied Science
Unit 3
Chemistry Applications
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Assignment 3.3
P3 Carry out investigations to collect primary data to define what
is meant by exothermic and endothermic reactions
M3 Using examples of suitable investigations collect primary
data and describe the differences between exothermic and
endothermic reactions
D3 Explain the processes involved in exothermic and
endothermic reactions
EDEXCEL LEVEL 2 BTEC FIRST CERTIFICATE
AND DIPLOMA IN APPLIED SCIENCE BT 16/10/09

Learning Outcomes
Understand the factors involved in chemical reactions.
Scenario
You have been moved to a different department within the chemical company
which you work for. As part of your new job you have been given the task of
investigating reactions which give out energy (exothermic) and reactions that
absorb energy (endothermic). Your new manager wants to know the effects
of these reactions so that he can compile a health and safety report into how
much heat is given out or taken in when reactions are taking place in the
laboratories.
Tasks
P3 Carry out research into the definitions of exothermic and endothermic.
Using this information, carry out a series of simple reactions and
conclude for each one whether it is an exothermic or endothermic
reaction, giving scientific reasons why. Produce a full account of your
findings which can be passed on to your manager.
M3 Carry out an investigation on the Heat of Neutralisation of a strong acid
and a strong alkali (e.g. hydrochloric acid and sodium hydroxide) and a
weak acid and a strong alkali (e.g. ethanoic acid and sodium
hydroxide). For both investigations, record the temperatures of the
reactants before adding them together and every minute after adding
them together. Draw a graph of temperature against time to compare
the temperature changes and use this information to write a memo to
your manager outlining the conclusions you can draw from your
investigations.
D3 Using the results of your investigations and an equation given to you by
your manager, calculate the energy changes that took place in the
reactions you carried out. Using the results of this and all your work on
exothermic and endothermic reactions, write an overall presentation for
your manager explaining the differences between the processes
involved in exothermic and endothermic reactions. You should use
simple energy profile diagrams to help with your explanations.
EDEXCEL LEVEL 2 BTEC FIRST CERTIFICATE
AND DIPLOMA IN APPLIED SCIENCE BT 16/10/09

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EDEXCEL LEVEL 2 BTEC FIRST CERTIFICATE
AND DIPLOMA IN APPLIED SCIENCE BT 16/10/09