Search results for “pH”

Deposition States of Matter & Gas Laws kJ/mol The direct conversion of a vapour into a solid without an intermediate liquid phase.

Daniell Cell Electrochemistry & Redox V The classic galvanic cell consisting of a zinc electrode in zinc sulfate and a copper electrode in copper sulfate. Zn + Cu²⁺ → Zn²⁺ + Cu, E° = 1.10 V

Debye–Hückel Limiting Law Chemical Equilibrium Dimensionless The theoretical relation predicting activity coefficients of ions in very dilute solution from their charge and the ionic strength. log γ = −A z² √I

Decantation Foundations of Chemistry Dimensionless The separation of a liquid from a settled solid or a denser immiscible liquid by carefully pouring off the upper layer.

Decomposition Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which a single compound breaks down into two or more simpler substances. AB → A + B

Degree of Ionisation Acids, Bases & Salts Dimensionless The fraction of dissolved electrolyte molecules that have broken into ions at equilibrium. α = ionised / total

Dehydration Reaction Stoichiometry & Chemical Reactions Dimensionless A reaction in which water is removed from a single molecule, generally producing an unsaturated or condensed product. R–CH₂–CH₂OH → R–CH=CH₂ + H₂O

Denaturation Biochemistry & Polymer Chemistry Dimensionless The loss of a protein's native three-dimensional structure without breaking its peptide bonds.

Diastereomer Organic Chemistry Dimensionless A stereoisomer that is not a mirror image of the compound with which it is compared.

Diprotic Acid Acids, Bases & Salts mol/L An acid that can donate two protons per molecule. H₂A ⇌ 2H⁺ + A²⁻

Distillation Foundations of Chemistry Dimensionless A separation technique that exploits differences in volatility by vaporising a liquid and condensing the vapour in a separate vessel.

Distribution Law Chemical Equilibrium Dimensionless The principle that a solute distributes itself between two immiscible solvents in a constant ratio at fixed temperature. K_D = C_organic / C_aqueous

Double Helix Biochemistry & Polymer Chemistry nm The structure of DNA, in which two antiparallel polynucleotide strands wind around a common axis. 10.5 base pairs per turn

Diagonal Relationship Atomic Structure & Periodicity Dimensionless The similarity in properties between an element of period 2 and the element one place to its lower right in period 3.

Results for “pH”