Chemistry
Articles about matter, substances, reactions and chemical science.
Reactivity (chemistry)
Reactivity series
Reagent
Realgar
Realgar — the red arsenic sulfide mineral
Rearrangement reaction
Red
Red (color)
Redox
Redox (Reduction–Oxidation) Reactions: Principles, Examples, and Applications
Reducing agent
Reducing agent (reductant)
Reduction
Reduction: concepts, types and interdisciplinary applications
Reduction (chemistry)
Refining
Refining: Principles, Methods, Uses and Impacts
Refrigerant
Refrigerant — properties, refrigeration cycle, uses and environmental issues
Registration, Evaluation, Authorisation and Restriction of Chemicals
Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH)
Relative atomic mass
Relative atomic mass: definition, calculation, and significance
Rhenium
Rhenium (element Re)
Rhodium
Rhodium: properties, occurrence, uses, and market significance
Rieke metals
Risk and Safety Statements
Risk and Safety Statements (R‑ and S‑phrases)
Rocket fuel
Rocket fuel (rocket propellant)
Roentgenium
Room temperature
Rotary evaporator
Round-bottom flask
Round-bottom flask: design, uses, and laboratory practice
Rubber
Rubidium
Rubidium — properties, history, occurrence and uses
Rubidium chloride
Rubidium chloride (RbCl)
Rubidium hydride
Rubidium hydroxide
Rubidium hydroxide (RbOH)
Rubidium nitrate
Rubidium nitrate (RbNO3): properties, preparation, uses and safety
Rubidium oxide
Rubidium oxide (Rb2O)
Rust
Rust (iron oxide): causes, chemistry, prevention, and impacts
Ruthenium
Ruthenium — properties, occurrence, uses, and history
Rutherfordium
Rutherfordium (element 104)
s-block
S-block elements of the periodic table
Saccharide
Saccharide: types, structure, and biological roles
Safety data sheet
Safety data sheet (SDS): purpose, content, and practical uses
Salicylic acid
Salicylic acid: properties, history, and common uses
Saline
Salt
Salt (chemistry): structure, properties, and uses
Samarium
Samarium (chemical element)
Sapphire
Sarin
Saturated fat
Saturated fat: definition, properties, dietary sources, and health context
Saturation (chemistry)
Scandium
Seaborgium
Seaborgium (element 106)