Since each student's accommodation needs are unique and the student is often most knowledgeable about effective accommodations, be sure to talk with the student about what accommodations he/she might need.
Some specific accommodations that might be useful to a student with a mobility impairment in a science lab include the following:
- Provide a lab partner.
- Use plastic instead of glassware.
- Allow extra time for set up and completion of lab work.
- Modify safety procedures.
- Make sure field sites are accessible.
- Provide an uncluttered lab with wide clear aisles.
- Give preferential seating to avoid physical barriers and assure visual access to demonstrations
- Place mirrors above the instructor giving a demonstration and/or use an enlarged screen for demonstrations.
- Provide wheelchair-accessible workstations that have an adjustable-height work surface.
- Make a slip stop mat available.
- Place utility and equipment controls within easy reach from seated position.
- Provide lab equipment such as electric stirrers and container fillers.
- Allow students to use support stands, beaker/object clamps and test racks.
- Make beakers and other lab equipment with handles available.
- Provide surgical gloves to make handling wet/slippery items easier.
- Modify procedures to use larger weights and volumes.
- Extended eyepieces so students who use wheelchairs can use microscopes from a seated position.
- Provide flexible connections to electrical, water and gas lines.
- Use single-action lever controls in place of knobs.
- Provide alternate lab storage methods (e.g.,"Lazy Susan", storage cabinet on casters).
This list is from the DO-IT publication Making Science Labs Accessible to Students with Disabilities .
For more examples of accommodations that can be made in science labs consult the DO-IT Knowledge Base article What are examples of accommodations in science laboratories? 
-  Making Science Labs Accessible to Students with Disabilities
-  What are examples of accommodations in science laboratories?