Laboratory Reports

When you explain your work, list data, calculate values and answer questions in your lab report, be sure the information would be clear to anyone who might read your lab report.

PRE-LAB: Due the day of the lab unless other instructions are given.

Pre-labs should be very short and may be only one paragraph in length. The hypothesis or purpose of the lab is the topic sentence. The procedure is summarized.   As always, the paragraph must end with a concluding sentence which should refer to the hypothesis.


  1. Graphs (if required) Graphs are to be an appropriate size. Each graph must have a title, all axes labeled, and the intervals of each axis clearly indicated.
  2. Data Table (if required) Fill in all parts of the data table. Units must be included.
  3. Calculations (if required) Show HOW calculations are made. Give the equation used and show how values are substituted into it. Label each value with units and identification of what the value represents. For a series of calculations using the same procedure, only a sample calculation needs to be shown.
  4. Questions Answer questions in complete sentences. The answer should be written so that the question being asked is understood.
  5. Written Conclusion (required unless otherwise instructed) The conclusion is to be written in paragraph form at the end of the lab report. Sentences relaying factual information are to be based on the observations and data collected and/or graphs produced during the lab itself. The word "I" should not be used when writing a conclusion. Never use the phrases "I think", "I believe", "I found", etc. State what happened or was found. Support your conclusion with data and observations from the lab.  Given possible reasons for errors - don't simply blame the equipment.

Only one copy of items #1 to 3 is turned in per lab group.   EVERYONE turns in items #4 and 5.