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36 Cards in this Set

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  • Back
presision
how exact the measurement is
accuracy
the closeness of the measurementto the true value of what is being measured
density
the ration of mass to volume
mass
the amount of matter in an object
volume
the amount of space taken up by an object
atom
the smallest particle of an element
element
a substance that cannot be broken down into simpler substances
compound
a substance that is made up of two or more simpler substances and can be broken down into those simpler substances
solution
a mixture that forms when substances dissolve and form a homogeneous mixture
heterogeneous
a type of mixture in which the oarts of the mixture are noticeably different from one another
homogeneous
a type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one from another
isotope
atoms of a given element that have different numbers of nuetrons and different mass numbers
atomic number
a unique number for each element that equals the number of protons in an atom of that element
coefficients
numbers that appear before a formula in a chemical equation to show the relative proportions of each reactant and product
polyatomic
a convalently bonded group of atoms that has a positivly or negativly charge and acts as a unit
exothermic
a description of a change in which a system releases energy to its surroundings
endothermic
a description of a change in which a system absorbs energy from its surroundings
ionic bond
the force that holds cations and anions togeteher
covalent bond
a chemical bond in which two atoms share a pair of valence electrons
ion
an atom or group of atoms that has a positive or negative charge
cation
an ion with a positive charge
anion
an ion with a negitive charge
valence electron
an electron that is in the highest occupied energy level
buffer
a solution that is resistant to large changes
melting point
the temperature at which a substance changes from a solid to a liquid
boiling point
the temperature at which a substance boils; the temperature at which vapor pressure is equal to atmospheric pressure
sublimation
the phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first
evaporation
the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point
condensation
the pahse change in which a substance changes from a gas or vapor to a liquid
solute
a substance whose particles are dissolved in a solution
solvent
a substance in which a solute dissolves
solution
a mixture that forms when substances dissolveand form a homogeneous mixture
acid
a compound that produces hydronium ions (H3O+) when dissolved in water; a proton donor
base
a compound that produces hydroxide ions (HO-) when dissolved in water; a proton acceptor
pH
a measure of hydronium ion consentration of a solution
electrolyte
a compound that produces ions when it dissolves