Atomic mass - of an element is the sum of the masses of its isotopes each multiplied by its natural abundance. Atom - the basic unit of a chemical element. Arrhenius base increases the concentration of OH - ions in an aqueous solution. Arrhenius base - is a substance that dissociates in water to form hydroxide (OH i) ions. Arrhenius acid increases the concentration of H + ions in an aqueous solution. Arrhenius acid - is a substance that dissociates in water to form hydrogen (H +) ions. A cathode is a negatively charged electrode that attracts the positive ions (cations) in a circuit or chemical reaction. Anode - is an electrode through which electric current flows into a polarized electrical device. amu - atomic mass unit (amu) is an unit of measurement that is used to measure the mass of atoms and roughly equivalent to 1.67x10 -27kg. Amalgam - a liquid alloy of mercury with another metal. Alpha Decay - or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle. Alloy - an alloy is a mixture of two or more elements, of which at least one is metal. Allotropes - are different structural modifications of the same element. Alkynes - are hydrocarbons containing at least one triple bond. Alkenes - are unsaturated hydrocarbons containing at least one carbon-carbon double bond C=C between two adjacent cabon atoms. Alkanes - are saturated hydrocarbons in which all the carbon and hydrogen atoms are only linked by single bonds. Alkaline earth metals - the elements found in Group 2 of the periodic table. ![]() Alkali metals - the elements found in Group 1 of the periodic table. ![]() Alchemy - speculative philosophy practiced in the Middle Ages and the Renaissance that involved the process of transmutation of the base metals into gold. Adsorption - is accumulation of a chemical on the surface of a solid (adsorbent) forming a film of adsorbate. Activation Energy - is minimum energy needed to start a reaction. Actinide - the actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Acid dissociation constant K a - is Quantitative measure of the strength of an acid in solution. Acid-base reaction - is a chemical reaction in which an electron pair is donated by a base to an acceptor acid. A Acid - a compound usually having a sour taste and capable of neutralizing alkalis and bases.
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