For my Unit 2 Applied Science assignment D, I had to conduct practical experiments in the fields of biology, chemistry, and physics. In the biology portion of the assignment, I performed chromatography of plant pigments using both paper and TLC plates to separate the plant pigment and determine its...
During this assignment, I did one practical for each subject. For biology, I performed the
chromatography of plant pigments using both paper and TLC plates; the entire process of this
was to separate the plant pigment to see what it consisted of. For chemistry, I performed titration
and colourimetry which was split into 4 parts where each part contributed to the success of the
practical. For physics, I performed calorimetry; I tried to work out the cooling curve of both
paraffin wax and stearic acid.
Table:
Prior Skills Skills developed in unit Things that didn’t go Skills to develop further
2 to plan
Titration and Knowing how to Using a graduated Incorrect amount Practise using a pipette
colourimetry use a pipette pipette inside the pipette
Basic Maths skills Calculating Got confused and Practise using the equation
concentration asked the teacher for
help
Knowing where to The process of Everything went to Just to practise and refine my
measure to and accurately pouring the plan skills so I can always get the
practise before solution into the correct measurement
hand pipette consistently
Basic How to read the Didn’t read at eye Learn correct way to use a
thermometer skills thermometer level thermometer
Calorimetry Know basics of How to calibrate a Digital thermometer Practise calibration process
how to use thermometer correctly didn’t calibrate
thermometer correctly
Basic maths skills Drawing a tangent Plotted graph Using computer software as it
Graph skills incorrectly and drew is more accurate
line wrong
Chromatography Knowing what the Using a solvent Didn’t use different Using different solvents to
mobile phase is efficiently solvents give different results to
analysis
Definition of TLC Knowing how to Some parts of TLC Handle the TLC plate more
plate handle a TLC plate started to break of carefully
correctly
Basic maths skills Calculating the Rf Used a different unit Vernier caliper – Using this
value piece of apparatus will ensure
an accurate measurement.
Skill development
Whilst performing the practical, I feel that I have developed much more then my peer due to me
reflecting about the mistakes I may have made or ways I could have improved and then thinking
of ways I could have made the practical much more reliable and accurate. Most of the skills in
the table I feel were really ones that just needed practicing and were not absolutely necessary to
getting correctly only refining so I got accurate results consistently. Whereas, they had
amendments which needed sorting out as they affected the results dearly. For example, they got
the incorrect amount of solution poured into the beaker making the results much less accurate
and needing immediate adjustment.
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