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anything that has mass and takes up 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 of a pure substance that can be observed without changing it into another substance

chemical property

A characteristic of a pure substance that describes its ability to change into different substances


A pure substance that cannot be broken down into simpler substances


The basic particle from which all elements are made

chemical bond

A force of attraction between two atoms


groups of two or more atoms held together by chemical bonds


a pure substance made of two or more elements chemically combined

chemical formula

shows the elements in the compound and the ratio of atoms


two or more substances that have been mixed together but not chemically combined

heterogeneous mixture

a mixture in which different materials can be distinguished easily

homogeneous mixture

a type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another


a homogeneous mixture of two or more substances

physical change

any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance

chemical change

a change in matter that produces one or more new substances

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 or cause change


the measure of the average energy of a random motion of particles of matter

thermal energy

the total energy of all the particles in an object

endothermic change

change in which energy is taken in

exothermic change

change in which energy is released

kinetic energy

energy of matter in motion

potential energy

energy an object has because of its position

chemical energy

the energy stored in chemical bonds

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


metal strips placed in solution that do not touch

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