Lab Report Format
• Title Page (always the first page)
• Abstract (separate page)
• Procedure Sheet(s) - as given out in class
• Data & Observations (begin new page - all remaining sections
can follow one another after the data section—use these
headings to organize)
• Calculations and Questions
• Results and Discussion
**Personal pronouns are not used in formal technical writing**
• Must contain the experiment title (for example, “How much water is in a cherry
tomato?” ) in large and/or bold font
• Should contain a graphic that depicts some aspect of the lab performed
• Must have an experimental objective - avoid the use of learning objectives
• Must list your name and your partner(s) name(s) (in smaller font), as well as the date
submitted, class name/period (Chemistry/9th period) and teacher's name.
An abstract is a one-paragraph summary that provides the reader with a clear, concise
snapshot of what you did and what you found without having to read through all of your
procedure, data, calculations, and conclusions. If your abstract proves to be interesting to
the reader, then they can continue reading for further details of the experiment. The first
sentence should state the main experimental objective(s) of the experiment. This should be
followed by a summary of the methods used to accomplish the objectives, but should not
include procedural details. In conclusion, state the results of the experiment and indicate
how well the objective was accomplished (percent error, percent yield, etc.).
• Include sheets provided or a detailed procedure that you have written yourself if
none was provided.
Data and Observations
• Use this heading to organize this part of the report. (The remaining sections may
follow each other in order on the same continuing page.)
• Present quantitative data in well-organized tables. All measurements should
incorporate proper use of significant figures and unit labels.
• Qualitative observations can be written in paragraph style under the tables.
• Accompanying graphs can be included here when appropriate.
Calculations and Questions
• Use this heading.
• Label calculations (What are you calculating? What are these numbers?).
• Include units with measurements and the identity of the substance if applicable.
• Show all work, beginning with an original equation if one was used.
• Pay attention to significant figures and rules of rounding.
• Answer in complete sentences when the question involves discussion. The reader should
know what the question was about by reading your answer.
Results and Discussion
This section can usually be one paragraph. In the first sentence, restate the results of the
experiment. Secondly, state the accepted value if there is one. Third, indicate the quality of
your results by re-stating your percent error, percent yield, etc. Finally, analyze your data
and results by conducting an error analysis. Was your percent error high or low? What are
the suspected sources of error? How did the error affect the original measurements (data)
and how will that compromise your calculated results? Be insightful. The logical thinking and
analysis required here are important skills in most jobs. Discuss sources of error that are
legitimate and relevant to the experiment. Unsubstantiated human error, equipment error,
etc. is not acceptable. In other words, you cannot attribute your error to "we must have
massed something wrong". If you know you massed something wrong or your data suggests
that you did, explain and support your conclusion. You must cite specific and concrete
sources of error. A helpful hint to writing a good error analysis: take careful notes
of all errors or suspected errors as you carry out the experiment. Don’t rely on your
memory for discussion of error when you are writing your lab report later! Document as you
go! Finally, make a solid connection between what you did, the results you got and any error.
• Always read the lab, paying careful attention to the procedure, before the lab begins.
• Results, per se, will not be graded for accuracy, but you must be able to explain reasons
for your error. Calculations must be correct.
• Quantitative labs must have quantitative conclusions (see above).
• Cleaning up the lab is everyone’s responsibility! Points will be deducted for failure to do
• When in doubt, ASK! I’m here to help!