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Vocab. 2-1, 2-2

Biology

QuestionAnswer
basic unit of matter atom
the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities nucleus
negatively charged particle; located outside the atomic nucleus electron
substance containing entirely of one type of atom element
atom of an element that has a number of neutrons different from that of other atoms of the same element isotope
substance formed by the chemical combinations of two or more elements in definite proportions compound
bond formed when one or more electrons are transferred from one atom to another ionic bond
atom that has a positive or negative charge ion
bond formed by the sharing of electrons between atoms covalent bond
smallest unit of most compounds molecule
a slight attraction that develops between the oppositely charged regions of nearby molecules van der Waals forces
attraction between molecules of the same substance cohesion
attraction between molecules of different substances adhesion
material composed of two or more elements or compounds physically mixed together but not chemically combined mixture
mixture of two or more substances in which the molecules of the substances are evenly distributed solution
substance that is dissolved in a solvent to make a solution solute
substance in which a solute is dissolved to form a solution solvent
mixture of water and nondissolved materials suspension
measurement system used to indicate the concentration of hydrogen ions in solution; ranges from 0 to 14 pH scale
compound that forms hydrogen ions in solution acid
compound that produces hydroxide ions in solution base
weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH buffer
Created by: r0402631
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