Chemistry

Phosphite

Phosphite — inorganic anions and related compounds

Phosphonium

Phosphor

Phosphor (luminescent materials)

Phosphoric acid

Phosphoric acid (orthophosphoric acid) — properties, production, and uses

Phosphorous acid

Phosphorous acid (H3PO3): properties, structure, and uses

Phosphorus

Phosphorus: element P, properties, allotropes, uses and impact

Phosphorus pentafluoride

Phosphorus pentafluoride (PF5)

Phosphorus trichloride

Phosphorus trichloride (PCl3): properties, production, uses, and safety

Phosphorus(III) iodide

Phosphorus(III) iodide (phosphorus triiodide)

Phosphorus(III) oxide

Phosphorus(V) chloride

Phosphorus(V) oxide

Phosphorus(V) oxide (phosphorus pentoxide)

Photochemistry

Photodissociation

Photodissociation (photolysis): how light breaks chemical bonds

Physical change

Physical change — alterations in form or state of matter

Physical chemistry

Physical chemistry: fundamentals, methods, history, and applications

Pi bond

Pigment

Pipette

Pipette: laboratory instruments for measuring and transferring liquids

Platinum

Platinum (chemical element and metal)

Plutonium

Pnictogen

Pnictogen (Group 15) — nitrogen, phosphorus, arsenic, antimony, bismuth, moscovium

Poison gas

Poison gas: properties, types, history, industrial uses, and safety

Polar bond

Polonium

Polybutadiene

Polycarbonate

Polychlorinated biphenyl

Polyene

Polymer

Polymer chemistry

Polymerization

Polymerization — formation, mechanisms, and applications of polymers

Polymorphism (materials science)

Polymorphism (materials science): crystal forms, types, and significance

Polystyrene

Polytetrafluoroethylene

Polytetrafluoroethylene (PTFE): properties, history, and uses

Polyurethane

Polyurethane: chemistry, types, uses, and important distinctions

Polyvinyl chloride

Polyvinyl chloride (PVC): properties, production, uses and concerns

Post-transition metal

Potash

Potash: potassium-bearing salts, history, and uses

Potassium

Potassium (chemical element K)

Potassium aluminium sulfate

Potassium arsenate

Potassium arsenite

Potassium bromate

Potassium bromide

Potassium bromide (KBr): properties, uses and history

Potassium carbonate

Potassium chlorate

Potassium chlorate (KClO3): properties, uses, and safety

Potassium chloride

Potassium chloride (KCl)