#compounds notes

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Krypton Difluoride

-- Kr F2

-- molar mass is 121.795 g x mol^-1

-- solid

-- density is 3.24 g cm^-3

-- volatile

-- colorless

-- first krypton compound discovered

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Zirconium Dioxide

-- Zr O2

-- molar mass is 123.218 g/mol

-- density is 5.68 g/cm^3

-- melting point is 2988 K

-- boiling point is 4570 K

-- soluble in HF

-- chemically unreactive

-- white color

-- main use is making hard ceramics

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Niobium Pentoxide

-- Nb2 O5

-- molar mass is 265.81

-- density is 4.6 g/cm^3

-- melting point is 1785 K

-- inorganic

-- solid

-- colorless

-- insoluble

-- mostly unreactive

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Ionic Compounds

-- made of one or more cations paired with one or more anions

-- usually the cations are metals and the anions are nonmetals

-- metals tend to lose electrons

-- nonmetals tend to gain electrons

-- when a metal and nonmetal combine, one or more electrons transfer from the metal to the nonmetal

-- this creates positive and negative ions that are attracted to each other

-- we can assume a compound made of a metal and a nonmetal is ionic

-- basic unit is the formula unit      -- smallest electrically neutral collection of ions      -- do not exist as discrete entities but part of a larger three-dimensional array

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Disulfur Dichloride

-- S2 Cl2

-- liquid      -- oily      -- yellowish-red

-- pungent odor

-- molar mass is 135.04 g/mol

-- density is 1.688 g/cm^3

-- melting point is 193 K

-- boiling point is 410.2 K

-- decomposes in water, losing HCl

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