SciFinder is the most important literature database in chemistry.
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QD 1-65 General Chemistry
QD 71-142 Analytical Chemistry
QD 146-197 Inorganic Chemistry
QD 241-441 Organic Chemistry
QD 415-436 Biochemistry
QD 450-801 Physical and Theoretical Chemistry
QD 625-655 Radiation Chemistry
QD 701-731 Photochemistry
QD 901-999 Crystallography
QP 501-801 Animal Biochemistry
A primary article will report the findings from researchers. The experiments they conduct will be reported in this type of article. You can find things like syntheses of specific molecules, properties of nanomolecules, and reaction mechanisms.
This type of article will summarize the research that has been done in a certain area of chemistry or biochemistry. Review articles are an excellent starting point if you're just beginning to study a specific subject area.