c. Hypothesis. The hypothesis is a statement, not a question, explaining the suppositions and outcome of
the experiment. It does not have to be written as an “If...then…” statement, although it should reference
the expected outcomes. Ex: “Specifically, we will test whether injecting frogs with JCl results in the frog’s
ability to jump further than those not injected with JCl.”
d. Materials. If deemed necessary by your professor, list all materials which you used to complete the lab.
Be as comprehensive as possible, listing both the types of materials as well as any necessary
measurements. Ex: if you used water as a solvent you should list it as “Water, 400ml.”
e. Experimental Procedure/Methods/Methodology. This section can have multiple names; use the term
preferred in your discipline. Regardless of name, it should be written in a chronological narrative,
explaining exactly what procedural steps you followed with short, clear descriptions of each action. Be as
detailed as possible without distracting from the section’s purpose. If you had to collect samples yourself,
include where and how you collected them and what you collected. If you used pre-prepared samples,
include that information as well. You should also note any deviations from the published procedure.
When writing a lab report you must keep in mind that all experiments should be able to be reproduced,
so include as much information as necessary to be able to reproduce the exact methods you used.
f. Data Analysis/Results. This section can have several names. Regardless of the name, all collected data
and calculated results should be presented in tables, graphs, or lists. All columns should be labelled with
the units appropriate to the identity of the measurement or calculation. (I.e., water should be labelled by
liters not grams, unless otherwise stated why.) Graphs should be plotted in Excel and properly labelled.
There should also be clear descriptions of qualitative observations. Do not include any raw data.
g. Calculations. All calculations, when necessary, should be separated from the data table and descriptively
labelled using actual data with appropriately-labelled units. Show the sequence of the calculation in
chronological order.
h. Discussion. Often, discussion is considered the most important part of a lab report as it demonstrates
competency of the experimental objective and the implications of the results. You should explain and
describe the experiment, including key data and calculated results. This is also the opportunity to analyze
and interpret the data your experiment produced, addressing any potential errors and explaining how the
conclusion is derived with reference to your hypothesis and the expected results. As such, you should
compare expected results with those obtained, explain your results in terms of theoretical issues, relate
results to your experimental objective(s), compare your results to similar investigations, and analyze the
strengths and limitations of your experimental design.
i. Conclusion. In the conclusions, follow through on your Results and Discussion to revisit your hypothesis to
state what you know for sure after completing the lab. If you received unexpected results, mention how
you might change your experimental procedure in the next attempt.
j. References. Your references should be listed in APA format. Check with your professor to determine
whether they prefer References on a separate page or directly after your Conclusion.
This is the basic structure of a lab report. However, this structure can alter depending on discipline, so check with
your professor on the correct format before turning in a lab report the first time.
(Notes adapted from Writing Center Workshop: CHM 221 Science Writing and Lab Reports)
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