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Classify common substances as elements or compounds based on their symbols and formulas.

• Key concepts/skills:Level 1: Define key vocabulary. Level 2: Classify substances given their

symbols or formulas.Level 3: Compare and contrast elements and

compounds.

Classify common substances as elements or compounds based on their symbols and formulas.

• Key vocabulary:• Pure substances• compound• molecule• Elements• formula• Element symbol• atom (review)

Classify common substances as elements or compounds based on their symbols and formulas.

Pure Substances – made up of only one type of atom or

molecule (Au) (H20 a glass of water is made of only H20 moecules)

I. Elements – matter that cannot be broken down

into a more simple form

A.Each of the 118 elements is represented by a symbol

B.The symbol is always capital/ the second letter of a

symbol is always lower case

Classify common substances as elements or compounds based on their symbols and formulas.

A.Symbols are named after people and places and

do not always match the word

B.Calcium – Ca, Potassium – K, Carbon - C

Classify common substances as elements or compounds based on their symbols and formulas.

II. Compounds – more than one type of atom

joined chemically

A.Formulas are symbols and subscripts that tell what kind

of atom and how many of each atom is in the Compound

B. Ammonia – NH4, Carbon dioxide – CO2 , Glucose

sugar – C6H12O6

Classify common substances as elements or compounds based on their symbols and formulas.

Classify common substances as elements or compounds based on their symbols and formulas.

Elements

SymbolsK- PotassiumCu - Copper

Classify common substances as elements or compounds based on their symbols and formulas.

Examples of Elements and Symbols

Classify common substances as elements or compounds based on their symbols and formulas.

Examples of Compounds and Formulas

Classify common substances as elements or compounds based on their symbols and formulas.

Element or Compound?