-Anything that occupies space and has mass

-Consists of: Living and nonliving things

-Exists in one of three states:

1. Liquid

2. Gas

3. Solid

-Due to the force of gravity acting on mass

-Depends on where mass is. Weighs more at sea level. Weighs less orbiting a space station.

Capacity to do work or put mass into motion.

Law of conservation of energy:

- Energy can't be created or destroyed

-One form of energy can be converted to another

1. Potential- Inactive or stored

2. Kinetic- Energy in motion

3. Heat- Energy transferred from one object to another because of a difference in temperature

4. Chemical-Form of potential energy

-Breaking apart or making chemical compounds

-Chemical energey can be absorbed or released in form of heat and/or electrical energy

5. Mechanical-Due to position or movement of mass

-Potential energy if mass is still

-Kinetic if mass is moving

-Substance that cannot be split into a simpler substance by chemical means

-112 recognized

-92 occur in nature

-20 are artificially created

-letter abreviation for element

-Usually first and second letters in name but may be in latin

-i.e. H(Hydrogen)

C(Carbon)

Ca(Calcium)

Na(Natrium = Sodium)

Classification of Elements

Metal

-Luster, thermal conductivity, electrical conductivity and malleability

-Left side of periodic table

Classification of Elements

Non-metals

-Absence of Luster, thermal conductivity, electrical conductivity and malleability

-Right side of Periodic Table

Classification of Elements

Nobel Gases

-Have little tendency to react with other elements

-Far right column of periodic table