- Ask a Librarian
Chemistry Lab Resources (for CHM 1XX and 2XX Labs)
- Organizing Your Lab Notebook
- Parts of a Lab Report
- Writing Your Lab Report/Worksheet
- Graphs/Tables
- Common Calculations
- Citing Sources
- Finding Chemical Properties
- Lab techniques, instrumentation, and protocols
- Chemical Safety
General tips
Whether you are filling out lab worksheets or writing up entire lab reports, there are a few tips that will help you to create more detailed and professional documents and to assist in grading:
- Always label your units
- Show all of your calculations (don’t leave out steps)
- Use complete sentences
- Write neatly
- Strike out mistakes with a single line
- Be aware of significant figures, noting the sensitivity of the device you are using for your measurements
Why do we write lab reports in passive voice?
It’s part of the scientific point of view. We observe and record as objectively as possible, avoiding personal bias by removing ourselves. Using the passive voice also clarifies procedures and descriptions so they can be easily reproduced and compared.
NOTE: DO NOT write reports as directions, such as those given in your lab manual. For example, do not write, "Heat the solution until it boils." Instead, write "The solution was heated to boiling."
Write in the third person - Scientific experiments demonstrate facts that do not depend on the observer, therefore, reports should avoid using the first and second person (I,me,my,we,our, OR us.)
Using the correct verb tense - Lab reports and research papers should be mainly written in the present tense. You should limit the use of the past tense to (1) describe specific experimental methods and observations, and (2) citing results published in the past.
Tables and Figures - Should be used when they are a more efficient ways to convey information than verbal description. They must be independent units, accompanied by explanatory captions that allow them to be understood by someone who has not read the text.
Writing in the passive voice
Examples of passive voice in lab reports.
200mL of distilled water was poured into a 500 mL beaker.
I poured 200mL of distilled water in a beaker. (active voice)
Pour 200mL water in a beaker. (direction/command)
The covered crucible was mounted on a ring stand.
We put the crucible on a ring stand. (active voice)
Set the crucible on a ring stand. (direction/command)
The temperature was initially measured at 75°C.
I measured the temperature at 75°C. (active voice)
Measure and write down the temperature. (direction/command)
It's understood that all actions were done by the experimenter.
Avoiding Plagiarism
- Avoiding Plagiarism From Purdue's OWL
Passive voice information derived from original work at Delta College Teaching/Learning Center
http://www.delta.edu/files/TLC/Writing%20Lab%20Reports%2009.doc
Writing a Lab Report
Purdue students explain strategies for dividing the workload for writing a lab report.
Sample Lab Reports
- Determination of the Alcohol Content of Whiskey [Courtesy of Univ. of Oregon]
- Synthesis and Characterization of Luminol [Courtesy of Truman State Univ.]
- Production of Biodiesel [Courtesy of Univ. of Vermont]
- << Previous: Parts of a Lab Report
- Next: Graphs/Tables >>
- Last Edited: Oct 23, 2024 11:08 AM
- URL: https://guides.lib.purdue.edu/chemlabs
IMAGES
VIDEO