/usr/share/desktop-directories/Chemistry.directory is in education-menus 1.812+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [Desktop Entry]
Name=Chemistry
Name[es]=QuĂmica
Icon=edu-chemistry
Type=Directory
|