Search results for “pH”

Radiopharmaceutical Nuclear & Radiochemistry MBq A radioactive compound administered to a patient for diagnosis or treatment.

Racemic Mixture Organic Chemistry degrees An equimolar mixture of two enantiomers, which shows no net optical rotation. 50:50 (+) and (−)

Radioactive Decay Series Nuclear & Radiochemistry Dimensionless A sequence of successive radioactive decays leading from a long-lived parent to a stable end product.

Radiocarbon Dating Nuclear & Radiochemistry years A dating technique that determines the age of organic material from its residual carbon-14 content. t = (t½ / 0.693) ln(N₀/N)

Reactant Stoichiometry & Chemical Reactions mol A starting substance that is consumed during a chemical reaction.

Redox Titration Analytical Chemistry & Spectroscopy mol/L A titration in which the reaction between titrant and analyte involves electron transfer.

Relative Lowering of Vapour Pressure Solutions & Colligative Properties Dimensionless The fractional reduction in a solvent's vapour pressure caused by dissolving a non-volatile solute. (p° − p) / p° = x_solute

Rutherford Model Atomic Structure & Periodicity Dimensionless The nuclear model of the atom, in which a tiny dense positive nucleus is surrounded by orbiting electrons in mostly empty space.

Radioactive Tracer Nuclear & Radiochemistry Bq A radioisotope introduced into a system so that its pathway can be followed by detecting its radiation.

Radioactivity Nuclear & Radiochemistry Bq The spontaneous emission of particles or electromagnetic radiation from unstable atomic nuclei.

Rate-Determining Step Chemical Kinetics & Catalysis Dimensionless The slowest step in a reaction mechanism, which limits the overall rate.

Reaction Intermediate Chemical Kinetics & Catalysis mol/L A species produced in one step of a mechanism and consumed in a later one, so it does not appear in the overall equation.

Rydberg Formula Atomic Structure & Periodicity m⁻¹ The empirical equation predicting the wavelengths of the spectral lines emitted by a hydrogen-like atom. 1/λ = R_H(1/n₁² − 1/n₂²)

Results for “pH”