This is the 18093rd most frequent Russian word.
химическом
"Chemical" (adjective form).
In this sentence, "химическое" is used as an adjective to describe "properties", indicating that the properties being studied are chemical in nature.
Я изучаю химические свойства материала в лаборатории.
I am studying the chemical properties of the material in the laboratory.
Here, "химическом" is an adjective describing "институте" (institute), specifying that the institute specializes in chemistry.
В химическом институте проводятся исследовательские работы.
Research projects are conducted at the chemical institute.
The usage of "химическом" here describes "анализе" (analysis), referring to the specific method of analysis related to chemistry.