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Chapter 2-1

Vocab

QuestionAnswer
atom basic unit of matter
nucleus 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
electron negatively charged particle; located outside the atomic nucleus
element substance consisting entirely of one type of atom
isotope atom of an element that has a number of neutrons different from that of other atoms of the same element
compound substance formed by the chemical combination of two or more elements in definite proportions
chemical bonds link that holds together atoms in compounds
ionic bonds bond formed when one or more electrons are transferred from one atom to another
ion atom that has a positive or negative charge
covalent bonds bond formed by the sharing of electrons between atoms
molecule smallest unit of most compounds
Van Der Waals forces a slight attraction that develops between the oppositely charged regions of nearby molecules
cohesion attraction between two molecules of the same substance
adhesion attraction between molecules of different substances: in plants attraction between unalike molecules
mixture material composed of two or more elements or compounds that are physically mixed together but not chemically combined
solution mixture of two or more substances in which the molecules of the substances are evenly distributed
solute substance that is dissolved in a solvent to make a solution
solvent substance in which a solute is dissolved to form a solution
suspension mixture of water and nondissolved materials
pH scale measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
acid compound that forms hydrogen ions (H+) in solution
base compound that produces hydroxide ions (OH+) in solution
buffer weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
Created by: 13_arauschenbac
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