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Subject: Re: [DCHAS-L] [EXT] [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:14 UTC

Author: Gmurczyk, Marta <00001fa03b1fa040-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

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Subject: Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:18 UTC

Author: James Kaufman <jkaufman**At_Symbol_Here**LABSAFETYINSTITUTE.ORG>

From: Doug Cody <dsc1950**At_Symbol_Here**GMAIL.COM>

Subject: Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:15 UTC

Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>

Message-ID: <CADnGk1gKsXH7sXqJGS6hzv7h=ov-s6Ag4s+8jqBa0WiiFobY=w**At_Symbol_Here**mail.gmail.com>

In-Reply-To: <SN6PR01MB49275434BEAAF769F4E9D8BFEE3EA**At_Symbol_Here**SN6PR01MB4927.prod.exchangelabs.com>

Demystify: 
The number of students you quoted, as well as the threesome concept, is not a good recipe for safety or learning. For General Chemistry, I recommend no more than 24. For Organic Chemistry, I recommend no more than 18. 

Douglas S. Cody, CSP(RET), CSHM Emeritus, AA, BA, BS, MS, MA

Assistant Professor

Health Careers & PE Department – Ammerman - Fire Protection & Life Safety Studies

Natural Sciences – Grant - Chemistry

Past President of the American Society of Safety Professionals, LI Chapter

Past Chair NYSUT Health & Safety Committee

codyd**At_Symbol_Here**sunysuffolk.edu 




On Mon, Aug 25, 2025 at 3:54 PM Leach, Patricia <Patricia.Leach**At_Symbol_Here**utdallas.edu> wrote:

Hello all,

We have had an explosion in the number of freshmen who are taking general chemistry this term, but funding has limited the number of TAs and instructors we have per lab room. The way the department has had to deal with this is to increase the number of students from 30 to 38 per section (limited by the Fire Marshall’s maximum occupancy of the rooms). They work in groups of 3 (not ideal at all). We have adjoining labs, so our shortage of instructors has been solved by having an instructor supervise two sections being held concurrently in a set of those labs. There is one TA per section.

 

In the past we have had 30 students (10 groups) supervised by a dedicated instructor (not working concurrent sections) and a TA, so about 15 students per person supervising. Now we can have as many as 38 students (13 groups) being supervised by one person at times, as the instructor moves between sections. I feel this is not safe.

 

What do people think is a safe ratio of supervising people to students (or student groups)?

 

Thanks,

 

Patricia Leach

Lab Manager

Department of Chemistry & Biochemistry

The University of Texas at Dallas

SLC 3.513

Office:  972-883-6583

Cell:  469-891-6426

 

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