How do I give a Chemistry set to a non-scientific sim?

Rummaging in repair piles, bins and dumpsters also gives parts.

Also, in the remains of dead Servos, but these are rare.

Salvaging for parts might work too, if you've unlocked it. (One unlocked you can get loads of good parts by salvaging everything possible at GeekCon). Not sure if this includes robot parts, but it's great for basic and electronic ones.