science vocab Flashcards
(23 cards)
protons
positive charge
Atom
the basic unit of matter
neutrons
neutral
electrons
negatively charged
element
a pure substance made up of just one type of atom
isotopes
atoms of the same element that differ in the number of neutrons they contain
chemical compound
a substance formed by the chemical combination of two or more elements in definite proportions
ionic bond
formed when one or more electrons are transferred from one atom to another
covalent bond
formed when one or more pairs of electrons are shared between two atoms
molecule
the smallest unit of most compounds
van der walls forces
type of intermolecular interaction in which when molecules are close together, a slight attraction develops between the oppositely charge regions of nearby molecules
polarity
positive or negative charges
hydrogen bonding
the attraction between a hydrogen atom on one molecule and the oxygen atom of another
cohesion
an attraction between molecules of same substance
adhesion
an attraction between molecules of different substances
mixture
a material composed of two or more elements or compounds that are physically mixed together but not chemically combined
solutions
a mixture in which all materials are evenly distributed throughout the solution
solute
the substance dissolved
solvent
the substance in which the solute dissolves
suspensions
mixtures of water and non-dissolved material
the pH Scale
a system of measurements that indicates the concentration of ions in a solution
acid
a compound that forms H+ ions in a solution
base
a compound that produces hydroxide ions in a solution
