AP Chemistry Vocabulary

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Can you name the AP Chemistry Terms?

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DefinitionTermHint/Explanation
An electrode at which oxidation occurs.
Compounds whose molecules have the same overall composition but different structures.This is relating to STRUCTURES, not neutrons.
A situation in which two or more orbitals have the same energy.
An electron-pair acceptor.
The enthalpy change, ∆H, for vaporization of a liquid.
The highest temperature at which it is possible to convert the gaseous form of a substance to a liquid. This (term) increases with an increase in the magnitude of intermolecular fo
The spreading of one substance through a space occupied by one or more other substances.
The energy required to separate completely the ions in an ionic solid.
The closeness of agreement among several measurements of the same quantity; the reproducibility of a measurement.Think about a dart board: if you consistently hit the bull's eye, you are both accurate and precise. If you consistently hit in one area on the dart board that isn't the bull's eye, you are just precise.
The energy change that occurs when an electron is added to a gaseous atom or ion.
The temperature at which solid, liquid, and gas phases coexist in equilibrium.
A measure of how closely individual measurements agree with the correct value.Think about a dart board: if you consistently hit the bull's eye, you are both accurate and precise. If you consistently hit in one area on the dart board that isn't the bull's eye, you are just precise.
A measure of the separation and magnitude of the positive and negative charges in polar molecules.
A unit of energy, it is the amount of energy needed to raise the temperature of 1g of water by 1 degree C from 14.5 degrees C to 15.5 degrees C. A related unit is the joule: 1 (ter
A molecule with one end having a partial negative charge and the other end having a partial positive charge; a polar molecule.
The energy required to remove an electron from a gaseous atom when the atom is in its ground state.
A property that a substance possesses if it contains one or more unpaired electrons. A (term) substance is drawn into a magnetic field.Represented with one arrow (up) in quantum number representations.
The ease with which the electron cloud of an atom or a molecule is distorted by an outside influence, thereby inducing a dipole moment.
The smallest increment (a quantum) of radiant energy; a photon of light with frequency v has an energy equal to hv.
A higher energy state than the ground state.When an electron is in a higher energy level (or state) than its regular state; this action requires (takes in) energy.
The minimum energy needed for reaction; the height of the energy barrier to formation of products.We often use this in biology; this (term) lowers when a catalyst is used in a reaction.
Atoms of the same element containing different numbers of neutrons and therefore having different masses.This is relation to NEUTRONS, not structures.
A law stating that the partial pressure of a solvent over a solution, P(A), is given by the vapor pressure of the pure solvent, P˚(A), times the mole fraction of a solvent in the The letters in parenthesis are subscripts.
A property of a system that is determined by the state or condition of the system and not by how it got to that state; its value is fixed when temperature, pressure, composition, a
The time required for the concentration of a reactant substance to decrease to half its initial value; the time required for half of a sample of a particular radioisotope to decay.This decay cannot be sped up in any way, whether it be through incineration, catalysts, pressure, temperature, etc.
DefinitionTermHint/Explanation
A measure of the ability of an atom that is bonded to another atom to attract electrons to itself.
A chemical reaction in which the oxidation states of certain atoms change.
The escape of gas through an orifice or hole.
The number of valence electrons in an isolated atom minus the number of electrons assigned to the atom in the Lewis structure.
The particular arrangement of atoms found at the top of the potential-energy barrier as a reaction proceeds from reactants to products.
A substance (molecule or ion) that acts as a proton donor.
The mixing of different types of atomic orbitals to produce a set of equivalent hybrid orbitals.
A rule stating that electrons occupy degenerate orbitals in such a way as to maximize the number of electrons with the same spin. In other words, each orbital has one electron plac
An electron-pair donor.
The lowest-energy, or most stable, state.The original state of an electron (requires no energy to be in that state).
A type of magnetism that causes a substance with no unpaired electrons to be weakly repelled from a magnetic field.Represented with two arrows (one up, one down) in quantum number representations.
A reaction in which two substances react through an exchange of their component ions: AX + BY → AY + BX. Precipitation and acid-base neutralization reactions are examples of thisThe 'informal' term is 'double-replacement reaction.'
A substance (molecule or ion) that acts as a proton acceptor.
Those properties of a solvent (vapor-pressure lowering, freezing-point lowering, boiling-point elevation, osmotic pressure) that depend on the total concentration of solute particl
A substance formed in one elementary step of a multistep mechanism and consumed in another; it is neither a reactant nor an ultimate product of the overall reaction.
Capable of behaving as either an acid or a base.
The enthalpy change, ∆H, for melting a solid.
The breaking of a molecule into two or more neutral fragments as a result of absorption of light.
An electrode at which reduction occurs.
A solution that undergoes a limited change in pH upon addition of a small amount of acid or base.
A rule stating that no two electrons in an atom may have the same four quantum numbers (n, l, m(l), and m(s)). As a reflection of this principle, there can be no more than two elec
An acid and a base, such as H(2)O and OHˉ, that differ only in the presence or absence of a proton.
A chemical reaction in which two or more substances combine to form a single product.The 'informal' term is 'synthesis reaction.'
A reaction in which a species undergoes simultaneous oxidation and reduction.An example would be N(2)O(3) gas reducing into both NO (gas) and NO(2) (gas).
The melting/boiling point at 1 atm pressure.This is a really obvious answer, but a correct one; the answer is practically in the question.

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