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volatility | Chemistry | 1 | A material quality which describes how readily a substance vaporizes. At a given temperature and pressure, a substance with high volatility is more likely to exist as a gas, while a substance with low volatility is more likely to exist as a liquid or solid; equivalently, less volatile substances will more readily condense from a gaseous state than highly volatile ones. |
volt | Chemistry | 1 | A derived unit of electric potential, electric potential difference, and electromotive force, defined as one joule of work per coulomb. |
v | Chemistry | 1 | A derived unit of electric potential, electric potential difference, and electromotive force, defined as one joule of work per coulomb. |
voltmeter | Chemistry | 1 | An instrument that measures electrical cell potential. |
volume | Chemistry | 1 | The quantity of three-dimensional space enclosed by a closed surface, or the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. The SI unit for volume is the cubic metre (m3). |
volumetric analysis | Chemistry | 1 | See titration. |
watch glass | Chemistry | 1 | A circular, concave piece of glass commonly used in chemistry laboratories as a working surface for various purposes, such as evaporating liquids, holding solids while they are being weighed, heating small amounts of a substance, or as a cover for a beaker. |
water | Chemistry | 1 | A polar inorganic compound with the chemical formula H2O that is a tasteless, odorless, and generally colorless liquid at standard temperature and pressure, though it also occurs naturally as a solid and a gas at the Earth's surface. It is the most abundant substance on Earth and therefore an integral component of virtually all chemical and biological systems. Water is often described as the "universal solvent" for its inherent ability to dissolve many substances. |
water of crystallization | Chemistry | 1 | Water molecules that are present inside crystals. Upon crystallization from water or aqueous solutions, many compounds incorporate water in the interstices of their crystalline frameworks; the water molecules are typically present in a stoichiometric ratio and may interact to varying degrees with the atoms of the crystal. |
wave function | Chemistry | 1 | A mathematical function describing the position of an electron within a three-dimensional space. |
weak acid | Chemistry | 1 | An acid that only partially dissociates when dissolved in a solvent because, according to the reaction HA ↽ − − ⇀ H + + A − {\ce {HA <=> H+ + A-}}} , equilibrium is reached while the concentration of the undissociated species HA {\ce {HA}}} is still significant; an example is acetic acid (CH3COOH). Contrast strong acid. |
wet chemistry | Chemistry | 1 | A form of analytical chemistry which uses classical laboratory methods such as simple observation and elementary chemical tests to study chemicals and chemical reactions, i.e. without the use of sophisticated instruments or automated or computerized analysis. It is often used in schools to teach the principles of chemistry to students. |
work-up | Chemistry | 1 | The series of manipulations required to isolate and purify the desired product or products of a chemical reaction. |
x-ray | Chemistry | 1 | A form of ionizing, electromagnetic radiation between gamma and ultraviolet rays in the electromagnetic spectrum. |
x-ray diffraction | Chemistry | 1 | A laboratory method for establishing the structure of a crystalline solid by directing single wavelength X-rays at the solid and analyzing the resulting diffraction pattern. |
x-ray photoelectron spectroscopy | Chemistry | 1 | A spectroscopic technique used to measure the chemical composition of a material. |
yield | Chemistry | 1 | The quantifiable amount of product produced during a chemical reaction. |
zone melting | Chemistry | 1 | Any of several methods of purifying crystalline solids which involve applying heat to a small region of a larger solid (particularly a metal ingot) until localized melting occurs, creating a molten zone which is then slowly moved along the surface to other parts of the solid by moving the target of the heating element. As it moves, the forward edge of the molten zone continuously melts new areas of impure solid, while leaving a path of purer solid behind it as previously melted areas are cooled and resolidified; because the molten liquid phase can hold a higher concentration of impurities than the solid phase, the impurities of melted areas tend to concentrate in the molten zone and be carried along as it moves, leaving behind regions with fewer impurities. The process is commonly used in the refinement of high-purity metalloids for use in semiconductors. |
zinc | Chemistry | 1 | A metallic chemical element with atomic number 30 and symbol Zn. |
zwitterion | Chemistry | 1 | Any molecule that contains an internal polarity by virtue of having an equal number of positively charged and negatively charged functional groups. |
catalyst | Chemistry | 1 | A substance that increases the rate of a chemical reaction without being consumed in the process. |
molecule | Chemistry | 1 | A group of atoms bonded together, representing the smallest unit of a chemical compound. |
oxidation | Chemistry | 1 | The process in which an atom or molecule loses electrons, often associated with the addition of oxygen or the removal of hydrogen. |
isotope | Chemistry | 1 | Atoms of the same element with the same number of protons but a different number of neutrons. |
covalent bond | Chemistry | 1 | A type of chemical bond in which two atoms share one or more pairs of electrons. |
periodic table | Chemistry | 1 | A tabular arrangement of chemical elements, organized by atomic number, electron configuration, and recurring chemical properties. |
avogadro's number | Chemistry | 1 | The number of particles in one mole of a substance, approximately 6.022 × 10²³. |
electrolysis | Chemistry | 1 | The chemical decomposition produced by passing an electric current through a liquid or solution. |
alloy | Chemistry | 1 | A mixture of two or more metals, or a metal and another element. |
reactant | Chemistry | 1 | A substance that takes part in and undergoes change during a chemical reaction. |
solubility | Chemistry | 1 | The ability of a substance to dissolve in a solvent to form a homogeneous solution. |
ionic bond | Chemistry | 1 | A type of chemical bond formed by the electrostatic attraction between oppositely charged ions. |
polymer | Chemistry | 1 | A large molecule composed of repeating structural units, typically connected by covalent bonds. |
acid | Chemistry | 1 | A substance that increases the concentration of hydrogen ions in a solution. |
base | Chemistry | 1 | A substance that increases the concentration of hydroxide ions in a solution. |
redox reaction | Chemistry | 1 | A chemical reaction in which the oxidation states of atoms are changed, involving the transfer of electrons. |
chemical equilibrium | Chemistry | 1 | The state in which the forward and reverse reactions occur at the same rate. |
sublimation | Chemistry | 1 | The process by which a solid changes directly into a gas without becoming a liquid. |
hydrogen bond | Chemistry | 1 | A weak bond between a hydrogen atom and another electronegative atom. |
endothermic reaction | Chemistry | 1 | A chemical reaction that absorbs heat energy from its surroundings. |
exothermic reaction | Chemistry | 1 | A chemical reaction that releases heat energy to its surroundings. |
molarity | Chemistry | 1 | A unit of concentration, defined as the number of moles of solute per liter of solution. |
electronegativity | Chemistry | 1 | The tendency of an atom to attract electrons in a chemical bond. |
radioactivity | Chemistry | 1 | The emission of particles or energy from the nucleus of an unstable atom. |
crystallization | Chemistry | 1 | A process of forming solid crystals from a liquid or gas phase, often used in chemical manufacturing. |
van der waals forces | Chemistry | 1 | Weak attractive forces between molecules due to temporary dipoles. |
chelation | Chemistry | 1 | The formation of a complex where a single molecule binds to a metal ion at multiple points. |
isomer | Chemistry | 1 | Compounds with the same molecular formula but different structural arrangements of atoms. |
zeolite | Chemistry | 1 | A microporous mineral used as a catalyst or molecular sieve. |
electrolyte | Chemistry | 1 | A substance that produces ions when dissolved in water, allowing the conduction of electricity. |
titration | Chemistry | 1 | A laboratory method of determining the concentration of a substance by adding a reagent of known concentration. |
kinetics | Chemistry | 1 | The study of the rates of chemical reactions. |
le chatelier's principle | Chemistry | 1 | The principle stating that if a system at equilibrium is disturbed, the system will shift to counteract the disturbance. |
ligand | Chemistry | 1 | An ion or molecule that binds to a central metal atom to form a complex. |
radical | Chemistry | 1 | An atom, molecule, or ion with unpaired valence electrons. |
aromaticity | Chemistry | 1 | A property of cyclic molecules with conjugated π-electron systems that leads to unusual stability. |
hydrophobic interaction | Chemistry | 1 | The tendency of nonpolar substances to aggregate in aqueous solutions to minimize disruption of water's hydrogen bonding. |
spectroscopy | Chemistry | 1 | A technique used to measure and analyze the interaction between matter and electromagnetic radiation. |
kieselguhr | Chemistry | 1 | A form of diatomaceous earth used in filtration and as an abrasive. |
hydrolysis | Chemistry | 1 | The chemical breakdown of a compound due to reaction with water. |
polymorphism | Chemistry | 1 | The ability of a material to exist in more than one form or crystal structure. |
mass spectrometry | Chemistry | 1 | An analytical technique used to measure the mass-to-charge ratio of ions. |
nanoparticle | Chemistry | 1 | A microscopic particle with dimensions on the nanometer scale, often exhibiting unique properties compared to bulk material. |
supramolecular chemistry | Chemistry | 1 | The study of non-covalent interactions between molecules to form larger complexes. |
fischer-tropsch synthesis | Chemistry | 1 | A method for producing liquid hydrocarbons from carbon monoxide and hydrogen, used in fuel production. |
x-ray crystallography | Chemistry | 1 | A technique for determining the atomic and molecular structure of a crystal by analyzing the diffraction of X-rays. |
molecular orbital theory | Chemistry | 1 | A theory in chemistry that describes the behavior of electrons in molecules using orbitals that span the entire molecule. |
polyelectrolyte | Chemistry | 1 | A polymer whose repeating units bear an electrolyte group, capable of dissociating in solution to form charged ions. |
organocatalysis | Chemistry | 1 | The use of organic molecules to catalyze chemical reactions, providing an alternative to metal catalysts. |
pyrimidine | Chemistry | 1 | A heterocyclic organic compound that is a component of nucleic acids like DNA and RNA. |
kerr effect | Chemistry | 1 | The change in the refractive index of a material due to an applied electric field, a phenomenon observed in nonlinear optics. |
atom | Chemistry | 1 | The smallest unit of matter, composed of protons, neutrons, and electrons. |
catalysis | Chemistry | 1 | The process by which the rate of a chemical reaction is increased by a catalyst, which remains unchanged after the reaction. |
acid-base reaction | Chemistry | 1 | A chemical reaction that involves the transfer of protons (H⁺) between reactants. |
enzyme | Chemistry | 1 | A protein that acts as a catalyst in biochemical reactions. |
alkali metals | Chemistry | 1 | Group 1 elements of the periodic table, known for their high reactivity, including lithium, sodium, and potassium. |
transition metals | Chemistry | 1 | Elements found in the middle of the periodic table that often form colored compounds and have variable oxidation states. |
lanthanides | Chemistry | 1 | A series of 15 chemical elements in the periodic table from lanthanum to lutetium, known for their magnetic and optical properties. |
actinides | Chemistry | 1 | A series of elements in the periodic table from actinium to lawrencium, many of which are radioactive. |
amino acid | Chemistry | 1 | Organic compounds that combine to form proteins and play key roles in cellular functions. |
covalent bonding | Chemistry | 1 | A chemical bond formed when two atoms share electrons to achieve a stable electron configuration. |
polyatomic ion | Chemistry | 1 | An ion composed of two or more atoms bonded together that carry a charge. |
vsepr theory | Chemistry | 1 | A model used to predict the shape of molecules based on the repulsion between electron pairs around a central atom. |
molecular orbital | Chemistry | 1 | A region in a molecule where electrons are likely to be found, formed by the overlap of atomic orbitals. |
titration curve | Chemistry | 1 | A graph of the pH of a solution during a titration, used to determine the concentration of an unknown solution. |
catalytic converter | Chemistry | 1 | A device used in vehicles to reduce toxic gases and pollutants from an internal combustion engine. |
zwitterion | Chemistry | 1 | A molecule that has both a positive and a negative charge, but is overall electrically neutral. |
levorotatory | Chemistry | 1 | A compound that rotates the plane of polarized light counterclockwise. |
dextrorotatory | Chemistry | 1 | A compound that rotates the plane of polarized light clockwise. |
solubility product | Chemistry | 1 | The equilibrium constant for the dissolution of a sparingly soluble ionic compound. |
nucleophilic substitution | Chemistry | 1 | A reaction in which a nucleophile replaces a leaving group in a molecule. |
organometallic compound | Chemistry | 1 | A compound containing a metal atom bonded to a carbon atom of an organic group. |
stoichiometry | Chemistry | 1 | The calculation of reactants and products in chemical reactions, based on the conservation of mass and the mole concept. |
michael addition | Chemistry | 1 | A nucleophilic addition reaction in which a nucleophile adds to an α,β-unsaturated carbonyl compound. |
hydrocarbon | Chemistry | 1 | A compound made entirely of hydrogen and carbon atoms, such as alkanes, alkenes, and alkynes. |
functional group | Chemistry | 1 | A specific group of atoms within a molecule that is responsible for its chemical reactions and properties. |
aromatic compounds | Chemistry | 1 | Organic compounds containing benzene rings, often with distinct odors. |
alkane | Chemistry | 1 | A saturated hydrocarbon with single bonds between carbon atoms, such as methane and ethane. |
alkene | Chemistry | 1 | A hydrocarbon with at least one double bond between carbon atoms, such as ethene (ethylene). |
alkyne | Chemistry | 1 | A hydrocarbon with at least one triple bond between carbon atoms, such as ethyne (acetylene). |
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