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Ch. 2.3 vocab
ch. 2.3 vocab
17
Biology
9th Grade
10/02/2011

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Term
Polar
Definition
describes a molecule in which the positive and negative charges are separated
Term
Hydrogen Bond
Definition
the intermolecular force occurring when a hydrogen atom that is bonded to a highly electronegative atom of one molecule is attracted to two unshared electrons of another molecule
Term
Cohesion
Definition
the force that holds molecules of a single material together
Term
Adhesion
Definition
the attractive force between two bodies of different substances that are in contact with each other
Term
Capillarity
Definition
the attraction between molecules that results in the rise of a liquid in small tubes
Term
Solution
Definition
a homogeneous mixture throughout which two or more substances are uniformly dispersed
Term
Solute
Definition
in a solution, the substance that dissolves in the solvent
Term
Solvent
Definition
in a solution, the substance in which the solute dissolves
Term
Concentration
Definition
the amount of a particular substance in a given quantity of a mixture, solution, or ore
Term
Saturated Solution
Definition
a solution that cannot dissolve any more solute under the given conditions
Term
Aqueous Solution
Definition
a solution in which water is the solvent
Term
Hyrdroxide Ion
Definition
the OH– ion
Term
Hydronium Ion
Definition
an ion consisting of a proton combined with a molecule of water; H3O+
Term
Acid
Definition
any compound that increases the number of hydronium ions when dissolved in water; acids turn blue litmus paper red and react with bases and some metals to form salts
Term
Base
Definition
any compound that increases the number of hydroxide ions when dissolved in water; bases turn red litmus paper blue and react with acids to form salts
Term
pH scale
Definition
a device used to determine the pH of a solution by measuring the potential difference between the pH electrode and the reference electrode that are immersed in the solution
Term
Buffer
Definition
a solution made from a weak acid and its conjugate base that neutralizes small amounts of acids or bases added to it
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