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Bio Ch 2 Terms

Penn Foster Bio Ch 2 Terms

TermDefinition
Acid molecules tending to raise the hydrogen ion concentration in a solution and to lower its pH numerically
Atom smallest partcile of an element that displays the properties of the element
Atomic Mass mass of an atom equal to the number of protons plus the number of neutrons w/I the nucleus
Atomic Number number of protons w/I the nucleus of an atom
Atomic Symbol one or two letters that represent the name of an element
Base molecules tending to lower the hydrogen ion concentration in a solution and raise thepH numerically
Buffer "substance or group of substance that tends to resis pH changes of a solution, thus stabilizing its relative acidity and basicity"
Compound substance having two or more different elements united chemically in a fixed ratio
Covalent Bone chemical bond in which atoms share one pair of electorns
Electron negative subatomic particle moving about in an energy level around the nucleus of an atom
Electronegativity ability of an atom to attract electrons toward itself in a chemical bond
Electron Shell concentric energy levels in which electrons orbit
Element substance that cannot be broken down into substance with different properties
Hydrogen Bond weak bond that arises between a slightly positive hydrogen atom of one molecule and a slightly negative atom of another molecule or between parts of the same molecule
Hydrogen Ion hydrogen atom that has lost its electron and therefore bears a positive charge
Hydrophilic type of molecule that interacts with water by dissolving in water and/or by forming hydrogen bonds with water molecules
Hydrophobic type of molecule that does not interact with water because it is nonpolar
Hydroxide Ion one of two ions that result when a water molecule dissociates
Ion charged particle that carries a negative or positive charge
Ionic Bond chemical bond in which ions are attracted to one another by opposite charges
Isotope atom of the same element having the same atomic number but a different mass number due to the number of neutrons
Matter anything that takes up space and has mass
Molecule union of two or more atoms of the same element
Neutron "neutral subatomic particle, located in the nucleus and assigned one atomic mass unit"
Nucleus "center of an atom, in which protons and neutrons are found"
Octet Rule states that an atom other than hydrogen tends to form bonds until it has electrons in its outer shell
pH a logarithmic meausre of the hydrogen ion concentration
pH Scale measurement scale for hydrogen ion concentration
Polar bond in which the sharing of electrons between atoms is unequal
Product substance that forms as a result of a reaction
Proton positive subatomic particle located in the nucleus and assigned one atomic mass unit
Reactant substance that participates in a reaction
Salt compound produced by a reaction between an acid and a base
Tracer substance having an attached radioactive isotope that allows a researcher to track its whereabouts in a biological system
Valence Shell outer shell of an atom
Created by: armyhorses