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Terms starting with T

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Chemical Kinetics & Catalysis

Temperature Coefficient

The factor by which a reaction rate increases for a 10 °C rise in temperature.

Q₁₀ = k(T+10) / k(T) Dimensionless
Chemical Kinetics & Catalysis

Termolecular Reaction

An elementary step requiring the simultaneous collision of three species.

rate = k[A][B][C] L²/(mol²·s)
Biochemistry & Polymer Chemistry

Tertiary Structure

The complete three-dimensional folded shape of a single polypeptide chain.

Dimensionless
Chemical Bonding & Molecular Structure

Tetrahedral Geometry

A molecular shape with four bonded atoms directed to the corners of a regular tetrahedron at 109.5°.

AX₄ degrees
Inorganic & Coordination Chemistry

Tetrahedral Splitting

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 cm⁻¹
Stoichiometry & Chemical Reactions

Theoretical Yield

The maximum mass of product that could be obtained from a given quantity of limiting reagent, assuming complete conversion.

m = n(limiting) × ratio × M g
Stoichiometry & Chemical Reactions

Thermal Decomposition

The breakdown of a compound into simpler substances brought about solely by heating.

AB →(Δ) A + B °C
Stoichiometry & Chemical Reactions

Thermite Reaction

A highly exothermic reaction in which aluminium powder reduces a metal oxide to the molten metal.

Fe₂O₃ + 2Al → 2Fe + Al₂O₃ kJ/mol
Thermochemistry & Thermodynamics

Thermochemical Equation

A balanced chemical equation that also states the enthalpy change for the amounts shown.

aA + bB → cC, ΔH = x kJ kJ/mol
Thermochemistry & Thermodynamics

Thermodynamic Equilibrium

The state in which a system's properties no longer change with time and all driving forces are balanced.

ΔG = 0 kJ/mol
Chemical Equilibrium

Thermodynamic Equilibrium Constant

The dimensionless equilibrium constant defined using activities rather than concentrations or pressures.

K° = Π a_i^ν Dimensionless
Thermochemistry & Thermodynamics

Thermodynamics

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

J
Nuclear & Radiochemistry

Thermonuclear Reaction

A fusion reaction sustained by the extremely high temperatures of the reacting material itself.

K
Biochemistry & Polymer Chemistry

Thermoplastic

A polymer that softens on heating and hardens again on cooling, reversibly and repeatedly.

°C
Biochemistry & Polymer Chemistry

Thermosetting Polymer

A polymer that sets permanently on first heating and cannot be softened again.

°C
Analytical Chemistry & Spectroscopy

Thin Layer Chromatography

A chromatographic technique using a thin layer of adsorbent coated on a flat plate.

Dimensionless
Thermochemistry & Thermodynamics

Third Law of Thermodynamics

The entropy of a perfect crystalline substance approaches zero as the temperature approaches absolute zero.

S → 0 as T → 0 K J/(mol·K)
Chemical Bonding & Molecular Structure

Three-Centre Two-Electron Bond

A bond in which a single pair of electrons is shared between three atoms rather than two.

A···H···B kJ/mol
Chemical Kinetics & Catalysis

Threshold Energy

The minimum total energy that colliding molecules must possess for the collision to be capable of reaction.

E_threshold = Ea + E_average kJ/mol
Acids, Bases & Salts

Titration

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 mol/L
Acids, Bases & Salts

Titration Curve

A plot of pH against the volume of titrant added during an acid–base titration.

Dimensionless
Atomic Structure & Periodicity

Transition Element

An element whose atom or a stable ion has a partially filled d subshell.

(n−1)d¹⁻⁹ Dimensionless
Chemical Kinetics & Catalysis

Transition State

The highest-energy configuration along the reaction coordinate, at which bonds are partly broken and partly formed.

denoted ‡ kJ/mol
Chemical Kinetics & Catalysis

Transition State Theory

The theory that treats the activated complex as being in quasi-equilibrium with reactants and calculates rate from its decomposition…

k = (k_BT/h) e^(−ΔG‡/RT) Various