chap 2 vocab Flashcards
the basic unit of matter
atom
in cells, structure that contains the cell’s genetic material in the form of DNA
nucleus
negatively charged particle; located in the space surrounding the nucleus
electron
pure substance that consists entirely of one type of atom
element
substance formed by the chemical combination of two or more elements in definite proportions
compound
chemical bond formed when one or more electrons are transferred from one atom to another
Ionic bond
type of bond between atoms in which the electrons are shared
covalent
attraction between molecules of the same substance
cohesion
force of attraction between different kinds of molecules
adhesion
material composed of two or more elements or compounds that are physically mixed together but not chemically combined
Mixture
a compound that forms hydrogen ions (H+) in solution; a solution with a pH of less than 7
Acid
a compound that produces hydroxide ions (OH-) in solution; a solution with a pH of more than 7
base
type of mixture in which all the components are evenly distributed
solution
small chemical unit that makes up a polymer
monomer
molecules composed of many monomers; makes up macromolecules
Polymer