Gen Chemistry 1: Chapter 1

Matter, Energy, & Measurement

chemistry

the study of the properties & behaviors of matter. 

Matter:

anything that has mass and occupies space, physical material of the universe 

property

 any characteristic that allows us to recognize a particular type of matter & to distinguish it from other types 

elements

all matter is comprised of combination of only about 100 substances 

atoms

 the almost infinitesimally small building blocks of matter 

molecules

2 or more atoms joined in specific shapes 

gas

 NO fixed volume or shape, instead it uniformly fills it container

liquid

has distinct volume independent of its container > assumes the shape of the portion of the container it occupies

solid

definite shape & volume. 

pure substances (DEF)

All substances are either elements or compounds

pure substances

elements, compounds, mixtures

elements

substances that canNOT  be decomposed into simpler substance (ONLY 1 ATOM) 

compounds

substances composed of 2 or more elements, containing 2 or more kinds of atoms

mixtures

 combination of two or more substances in which each substance retains its chemical identity

homogenous mixture

 substance are distributed uniformly

heterogenous mixture

 the substances are not distributed uninformed & regions of diff. composition