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chemistry
the study of the composition, structure, and properties of matter and the changes it undergoes
chemical
any substance that has a definite composition
atom
the smallest unit of an element that maintains the properties of that element
element
a pure substance made of only one kind of atom
mass
a measure of the amount of matter
matter
anything that has mass and takes up space
compound
a substance that is made from the atoms of two or more elements that are chemically bonded
physical property
a characteristic that can be observed or measured without changing the identity of the substance
change of state
a physical change of a substance from one state to another
chemical property
the ability of a substance to undergo a change that transforms it into a different substance
gas
the state of matter in which a substance has neither definite volume nor definite shape
liquid
the state of matter in which the substance has a definite volume but an indefinite shape
physical change
a change in a substance that does not involve a change in the identity of the substance
plasma
a high-temperature physical state of matter in which atoms lose their electrons
solid
the state of matter in which the substance has definite volume and definite shape
chemical change
a change in which one or more substances are converted into different substances
chemical reaction
a reaction in which one or more substances are converted into different substances
product
a substance that is formed by a chemical change
reactant
a substance that reacts in a chemical change
mixture
a blend of two or more kinds of matter, each of which retains its own identity and properties
heterogeneous
not having a uniform composition throughout
homogeneous
having a uniform composition throughout
pure substance
a substance that has a fixed composition and differs from a mixture in that every sample of a given pure substance has exactly the same characteristic properties and composition
family
a vertical column of the periodic table
group
a vertical column of the periodic table
period
a horizontal row of elements in the periodic table
metal
an element that is a good conductor of heat and electricity
nonmetal
an element that is a poor conductor of heat and electricity
metalloid
an element that has some characteristics of metals and some characteristics of nonmetals