Updates six queries for the /chemical aspect

[egonw]

Fixes #2665

Description

Updates six queries for the /chemical aspect. Some queries run out of the box, while two needed some tweaking.

It also fixes two problems in chemical_biological-processes.sparql.

Caveats

Check any of the following which apply:

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

Testing

The following two pages can be tested (branch versus online):

• https://scholia.toolforge.org/chemical/Q47512
• https://scholia.toolforge.org/chemical/Q289372

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)