I
- ice
- Idocrase
- Illite
- Ilmenite
- Ilya Prigogine
- Indium
- infrared spectroscopy
- Inorganic chemistry
- Intermolecular force
- International Temperature Scale
- International Union of Pure and Applied Chemistry
- Iodine
- Ion
- Ionic bond
- ionization potential
- Irène Joliot-Curie
- Iridium
- iron
- Iron (III) oxide
- Irving Langmuir
- isocyanate
- Isomer
- isoprene
- isotope
- Isotope table (complete)
- Isotope table (divided)
- Israel Shahak
- IUPAC
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