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Lecture 6

Lecture 6 - Practice Converting Grams to Molecules How many...

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Practice - Converting Grams to Molecules How many molecules are in 50.0 g of PbO 2 ? (PbO 2 = 239.2)

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Example – Naming Binary Ionic with Variable Charge Metal CuF 2 1. Identify cation and anion F = F - because it is Group 7 Cu = Cu 2+ to balance the two (-) charges from 2 F - 1. Name the cation Cu 2+ = copper(II) 1. Name the anion F - = fluoride 1. Write the cation name first, then the anion name copper(II) fluoride
Name the following compounds 1. TiCl 4 2. PbBr 2 3. Fe 2 S 3

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Example – Writing Formula for Binary Ionic Compounds Containing Variable Charge Metal manganese(IV) sulfide 1. Write the symbol for the cation and its charge 2. Write the symbol for the anion and its charge 3. Charge (without sign) becomes subscript for other ion 4. Reduce subscripts to smallest whole number ratio 5. Check that the total charge of the cations cancels the total charge of the anions Mn +4 S 2- Mn +4 S 2- Mn 2 S 4 Mn = (1)∙(+4) = +4 S = (2)∙(-2) = -4 MnS 2
Practice - What are the formulas for compounds made from the following ions? 1. copper(II) ion with a nitride ion 2. iron(III) ion with a bromide ion

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1. Identify the ions Na = Na + because in Group 1A SO 4 = SO 4 2- a polyatomic ion 1. Name the cation Na + = sodium, metal with invariant charge 1. Name the anion SO 4 2- = sulfate 1. Write the name of the cation followed by the name of the anion sodium sulfate Example – Naming Ionic Compounds Containing a Polyatomic Ion Na 2 SO 4
Some Common Polyatomic Ions Name Formula acetate C 2 H 3 O 2 carbonate CO 3 2– hydrogen carbonate (aka bicarbonate) HCO 3 hydroxide OH nitrate NO 3 nitrite NO 2 chromate CrO 4 2– dichromate Cr 2 O 7 2– ammonium NH 4 + Name Formula hypochlorite ClO chlorite ClO 2 chlorate ClO 3 perchlorate ClO 4 sulfate SO 4 2– sulfite SO 3 2– hydrogen sulfate (aka bisulfate) HSO 4 hydrogen sulfite (aka bisulfite) HSO 3

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Name the following 1.
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