Chemistry

scientific study of the composition, structure, and properties of matter and the changes that matter undergoes.

matter

anything that has mass and takes up space.

element

a substance that cannot be seperated or broken down into simpler substances.

Atom

the smallest unit of an element that maintains the properties of that element.

Compound

a substance made up of atoms of two or more different elements joined by chemical bonds

Molecule

the smallest unit of a substance that keeps all of the physical and chemical properties.

chemica formula

a combination of chemical symbols and numbers to represent a substance

pure substance

a sample of matter, either a single element or a single compound that has definite chemical and physical properties

mixture

a combination of 2 or more substances that are not chemically combined

melting point

the temperature and pressure at which a solid becomes a liquid

boiling point

the temperature at which a solid becmes a liquid

density

the ratio of mass of a substance to the volume of the substance

reactivity

the capacity of a substance to combine chemically with with another substance

flammability

the ability of a substance to react to in the presence of oxygen and burn when exposed to a flame

physical change

a change of matter from one form to another without a change in chemical properties

chemical change

a change that occurs when a substance changes composition by forming one or more new substances