Chemistry terms starting with T

Temperature Coefficient Chemical Kinetics & Catalysis Dimensionless The factor by which a reaction rate increases for a 10 °C rise in temperature. Q₁₀ = k(T+10) / k(T)

Termolecular Reaction Chemical Kinetics & Catalysis L²/(mol²·s) An elementary step requiring the simultaneous collision of three species. rate = k[A][B][C]

Tertiary Structure Biochemistry & Polymer Chemistry Dimensionless The complete three-dimensional folded shape of a single polypeptide chain.

Tetrahedral Geometry Chemical Bonding & Molecular Structure degrees A molecular shape with four bonded atoms directed to the corners of a regular tetrahedron at 109.5°. AX₄

Tetrahedral Splitting Inorganic & Coordination Chemistry cm⁻¹ The division of d orbitals under a tetrahedral field, with the e set below the t₂ set and a much smaller gap. Δ_t = (4/9)Δ₀

Theoretical Yield Stoichiometry & Chemical Reactions g The maximum mass of product that could be obtained from a given quantity of limiting reagent, assuming complete conversion. m = n(limiting) × ratio × M

Thermal Decomposition Stoichiometry & Chemical Reactions °C The breakdown of a compound into simpler substances brought about solely by heating. AB →(Δ) A + B

Thermite Reaction Stoichiometry & Chemical Reactions kJ/mol A highly exothermic reaction in which aluminium powder reduces a metal oxide to the molten metal. Fe₂O₃ + 2Al → 2Fe + Al₂O₃

Thermochemical Equation Thermochemistry & Thermodynamics kJ/mol A balanced chemical equation that also states the enthalpy change for the amounts shown. aA + bB → cC, ΔH = x kJ

Thermodynamic Equilibrium Thermochemistry & Thermodynamics kJ/mol The state in which a system's properties no longer change with time and all driving forces are balanced. ΔG = 0

Thermodynamic Equilibrium Constant Chemical Equilibrium Dimensionless The dimensionless equilibrium constant defined using activities rather than concentrations or pressures. K° = Π a_i^ν

Thermodynamics Thermochemistry & Thermodynamics J The branch of science dealing with energy, its transformations, and the direction in which processes occur.

Thermonuclear Reaction Nuclear & Radiochemistry K A fusion reaction sustained by the extremely high temperatures of the reacting material itself.

Thermoplastic Biochemistry & Polymer Chemistry °C A polymer that softens on heating and hardens again on cooling, reversibly and repeatedly.

Thermosetting Polymer Biochemistry & Polymer Chemistry °C A polymer that sets permanently on first heating and cannot be softened again.

Thin Layer Chromatography Analytical Chemistry & Spectroscopy Dimensionless A chromatographic technique using a thin layer of adsorbent coated on a flat plate.

Third Law of Thermodynamics Thermochemistry & Thermodynamics J/(mol·K) The entropy of a perfect crystalline substance approaches zero as the temperature approaches absolute zero. S → 0 as T → 0 K

Three-Centre Two-Electron Bond Chemical Bonding & Molecular Structure kJ/mol A bond in which a single pair of electrons is shared between three atoms rather than two. A···H···B

Threshold Energy Chemical Kinetics & Catalysis kJ/mol The minimum total energy that colliding molecules must possess for the collision to be capable of reaction. E_threshold = Ea + E_average

Titration Acids, Bases & Salts mol/L A quantitative technique in which a solution of known concentration is added to another until the reaction between them is exactly complete. n₁ / n₂ = a / b

Titration Curve Acids, Bases & Salts Dimensionless A plot of pH against the volume of titrant added during an acid–base titration.

Transition Element Atomic Structure & Periodicity Dimensionless An element whose atom or a stable ion has a partially filled d subshell. (n−1)d¹⁻⁹

Transition State Chemical Kinetics & Catalysis kJ/mol The highest-energy configuration along the reaction coordinate, at which bonds are partly broken and partly formed. denoted ‡

Transition State Theory Chemical Kinetics & Catalysis Various The theory that treats the activated complex as being in quasi-equilibrium with reactants and calculates rate from its decomposition frequency. k = (k_BT/h) e^(−ΔG‡/RT)

Terms starting with T