Search results for “Mole”

Photochemical Quantum Yield Chemical Kinetics & Catalysis Dimensionless The number of molecules reacting for each photon of light absorbed by the system. Φ = molecules reacted / photons absorbed

Photochemical Reaction Stoichiometry & Chemical Reactions nm A reaction initiated by the absorption of light, which promotes a molecule to an electronically excited state. A + hν → A*

Physisorption Chemical Kinetics & Catalysis kJ/mol Weak adsorption in which molecules are held to a surface by van der Waals forces alone. ΔH ≈ −20 to −40 kJ/mol

Polarisability Chemical Bonding & Molecular Structure C·m²/V The ease with which the electron cloud of an atom, ion or molecule can be distorted by an external electric field. μ_induced = α × E

Polymer Biochemistry & Polymer Chemistry g/mol A large molecule built from many repeating structural units joined by covalent bonds. –(A)ₙ–

Polyprotic Acid Acids, Bases & Salts mol/L An acid capable of donating more than one proton per molecule. H₂A ⇌ H⁺ + HA⁻ ⇌ 2H⁺ + A²⁻

Protein Biochemistry & Polymer Chemistry g/mol A large biomolecule made of one or more chains of amino acids folded into a specific three-dimensional shape.

Partial Pressure States of Matter & Gas Laws Pa The pressure that one component of a gas mixture would exert if it alone occupied the whole volume. p_i = x_i × p_total

Phenolphthalein Acids, Bases & Salts Dimensionless An acid–base indicator that is colourless in acid and pink in alkaline solution, changing between pH 8.3 and 10.0. C₂₀H₁₄O₄

Phospholipid Biochemistry & Polymer Chemistry Dimensionless A lipid in which one fatty acid of a triglyceride is replaced by a phosphate-containing group.

Photosynthesis Biochemistry & Polymer Chemistry kJ/mol The process by which plants use light energy to convert carbon dioxide and water into carbohydrate and oxygen. 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Physical Change Foundations of Chemistry Dimensionless A change that alters the form or state of a substance while leaving its chemical composition intact.

Pi Bond Chemical Bonding & Molecular Structure kJ/mol A covalent bond formed by the sideways overlap of parallel p orbitals, with electron density above and below the internuclear axis.

pKa Acids, Bases & Salts Dimensionless The negative logarithm of the acid dissociation constant, giving a convenient scale of acid strength. pKa = −log Ka

Polar Covalent Bond Chemical Bonding & Molecular Structure D A covalent bond in which the shared electrons are unequally distributed because the bonded atoms differ in electronegativity. δ⁺A—Bδ⁻

Positive Deviation Solutions & Colligative Properties Pa Behaviour in which a solution exerts a higher vapour pressure than Raoult's law predicts. p > x p°

Pyrolysis Stoichiometry & Chemical Reactions °C The thermal decomposition of a substance at high temperature in the absence of oxygen. complex → simpler fragments (Δ, no O₂)

Pre-exponential Factor Chemical Kinetics & Catalysis Various The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions. A = pZ

Results for “Mole”