QUIZ NEXT CLASS!!! Study all notes, classwork, and homework Topics:

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Presentation transcript:

QUIZ NEXT CLASS!!! Study all notes, classwork, and homework Topics: Matter Atoms Pure substances Mixtures Elements – symbols Compounds - formulas

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

Ex/ H2O Formulas subscript Represents the smallest unit of a substance that still has the properties of that substance Made up of symbols and subscripts Symbols tell you what element(s) make up the substance Subscripts tell you how many of each element make up the substance (they apply to the element they are AFTER No subscript after an element means there is only one atom of that element in the substance

Example: CH4 C = carbon, 1 atom H = hydrogen, 4 atoms

AgNO3 Ag = silver, 1 atom N = nitrogen, 1 atom O = oxygen, 3 atoms

Practice K2CO3 FeCO3 NaNO2 Na2SO4 NaHSO4

Honors: Parentheses A polyatomic ion is a group of two or more atoms bonded together that then bond to another atom/group as a unit. If there are more than one of these units bonded in a compound they are contained within parentheses and a subscript is used. The subscript is distributed to all of the elements in the polyatomic ion. Ex/ Ca(NO3)2 Ca = 1 N = 1 x 2 = 2 O = 3 x 2 = 6