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BSC 114 Exam 1

Bio Chapters 2-5

TermDefinition
trace elements are those required by an organism in relatively minute quantities
greater The more distant an electron is from the nucleus of an atom, the ______ its potential energy.
ionic bonds resulting from loss and gain of electrons by bonded atoms (e.g., NaCl); strong, but weaker than others
covalent strong bonds resulting from the sharing of valence electrons by atoms; can be nonpolar or polar
Van der Waals Force very weak bonds resulting from transient shifting of charges created by the constant movement of electrons.
hydrogen weak bond formed between a hydrogen atom in a polar compound and an electronegative atom in another polar compound
nonpolar valence electrons shared equally by bonded atoms
polar valence electrons not shared equally by bonded atoms
structural formula H-H is example of this formula
molecular formula H2 is example of this formula
ionic bond an _____ _____ is an attraction between anion and cation
polar covalent In a water molecule, the electrons of its _____ _______ bonds spend more time near the oxygen atom than the hydrogen atoms.
hydrogen polarity allows water molecules to form _____ bonds
adhesion chemical attraction between different substances
cohesion chemical attraction between particles of the same substance
adhere water will ______ to other polar or charged substances, such as cell walls of plants
solution a _______ is a liquid that is a completely homogeneous mixture of substances
solvent A ____ is the dissolving agent of a solution
solute A _______ is a substance dissolved in a solution
aqueous solution An _______ _______ is one in which water is the solvent
molarity ________ is the number of moles of solute per liter of aqueous solution.
ten fold Each whole number change in pH (e.g., pH 5 to pH 6) represents a __________ difference in the concentration of H+ and OH– ions.
1000 A pH of 3 is not twice as acidic as a pH of 6, it’s ___ times as acidic
buffers are substances that minimize changes in concentrations of H+ and OH− in a solution.
Created by: chatfield39
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