Do Now: What do the following things have in common

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Presentation transcript:

Do Now: What do the following things have in common Do Now: What do the following things have in common? What is the benefit to using them? BRB ROTFL SMH LOL GR8 UR XOXO JK

Using Symbols and Formulas TO DESCRIBE MATTER

Symbols – represent an element Elements are represented using a 1 or 2 letter symbol The first letter MUST be capitalized, and the second must be lowercase Example: H = hydrogen, He = helium

Formulas – represent a molecule Made up of symbols and subscripts Symbols tell you what element(s) are in the molecule Subscripts tell you how many of each element make up the molecule (no subscript = only one atom of that element) Ex/ H2O subscript

Example: CH4 C = Carbon – 1 H = Hydrogen – 4 AgNO3 Ag = Silver – 1 N = Nitrogen – 1 O = Oxygen - 3

Practice K2CO3 FeCO3 NaNO2 Na2SO4 NaHSO4

K2CO3

FeCO3

NaNO2

Na2SO4

NaHSO4