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kinetic molecular theory of matter a theory that matter is composed of small particles, all in random motion.
physical properties properties that can usually be observed with our senses
physical change occurs when the appearance of matter changes, but composition of the matter does not change
physical constants density, boiling, melting and freezing points water:0 degrees Celsius, 100 degrees Celsius, 1g/ml
chemical properties a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed
chemical change a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance
pure substances has the same composition throughout, occurs naturally
elements cannot be broken down
compounds formed from the chemical combination of two or more elements
homogeneous mixture the parts of the mixture are evenly distributed
heterogeneous mixture the parts of the mixture are not evenly distributed
solutions homogeneous mixtures that form when one substance is dissolved in another substance
inertia the resistance to change
time interval the time between the beginning and the end of a scientific event
valence the number of electrons elements borrow or lend
covalent bonds formed when atoms share electrons to fill their outer shells
ionic formed when atoms transfer (gain or lose) electrons
mixtures formed when two or more substances are physically combined
Created by: Trinklea595