15.1

Physical Change

• A change that does not result in a new substance being formed

• A change that transforms one substance into a different substance

Chemical Change

• A change that does not result in a new substance being formed

• A change that transforms one substance into a different substance

Periodic table

• A chart that has some elements

• A chart that orginizes the elements by their chemical properties and increasing atomic number

• a row in the periodic table

• elements that are typically shiny and good conductors of heat and electricity

period

• elements in the first group of the periodic table

• A row of the periodic table

• a column of the periodic table

• A up and down

Group

• elements that are poor conductors

• A column of the periodic table

• a row of the periodic table

metals

• elements that are not in the periodic table

• elements that are typically shiny and good conductors of heat and electricity

• elements that are poor conductors of heat and electricity

atomic mass unit

• a unit of mass equal to 1.66 * 10^-24

• the average mass of all the known isotopes of an element , expressed in amu

• elements in the first group of the periodic table

nonmetals

• elements that are typically shiny and good conductors of heat and electricity

• elements that are poor conductors of heat and electricity

atomic mass

• the average mass (in amu) of an atom of each element

• 1.66 × 10-24

• the averge amount of mass in a atom

alkali metals

• elements in the first group of the period table

• elements in the group containing flourine, chlorine, and bromine, among others

• elements in group containing helium, neon, and argon, among others