CHM 104 Unit 1 Study Guide

Pure substance

matter that can be represented with one chemical formula or symbol

Mixture

a combination of two or more substances that can be separated

Homogeneous mixture

A mixture whose composition is the same throughout the sample

Heterogeneous mixture

a mixture in which the composition is not uniform throughout

Element

matter made up of only one type of atom

Compound

A pure substance made up of two or more elements chemically joined together

Period number

Horizontal row on the periodic table

Group number

Vertical column in the periodic table

Alkali metals

Group 1A

Alkaline Earth metals

Group 2A

Halogens

Group 7A

Noble gases

Group 8A

Metals

Nonmetals

Physical reaction

a change in the state of matter, while the substance maintains the same chemical identity

Chemical reaction

a change in the chemical identity of a substance

grams

unit for mass

liters

unit for volume

meters

unit for distance

grams per liter

unit for density

weight

measure of the force of gravity on an object

atom

Basic unit of matter

proton location

nucleus

proton relative mass

very heavy

proton charge

positive

neutron location

nucleus

neutron relative mass

very heavy

neutron charge

neutral

electron location

electron cloud

electron relative mass

very light

electron charge

negative