anything that has mass and occupies space.
the study of the properties of matter and how matter changes
A single kind of matter that is pure and has a specific set of properties
physical property
a characteristic that can be observed or measured without changing the identity of the substance
chemical property
relates to a substance's ability to undergo changes that transform it into different substances
any substance that cannot be broken down into simpler substances
smallest particle of an element
chemical bond
the force that holds two atoms together
a combination of two or more atoms
two or more elements that are chemically combined
chemical formula
a formula that gives the elements in a compound and the ratio of atoms
A combination of two or more substances that are not chemically combined
heterogeneous mixture
a mixture in which pure substances are unevenly distributed throughout the mixture
homeogeneous mixture
a mixture in which substances are evenly distributed throughout.
a homogeneous mixture of two or more substances
physical change
a change in a substance that does not involve a change in the identity of the substance
chemical change
a change that occurs when one or more substances change into entirely new substances with different properties
Law of conservation of Mass
the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
the ability to do work
endothermic change
a change in which energy is taken in
exothermic change
a change in which energy is given off
thermal energy
the total kinetic and potential energy of all the particles in a substance.
chemical energy
potential energy stored in chemical bonds of molecules.
electromagnetic energy
A form of energy that travels through space as waves
electrical energy
the energy of electrically charged particles moving from one place to another
A metal strip that conducts electricity