OWL 2.6d

Reminder…

cation anion

cation anion

EOC

The total number of positive charges must equal the total number of negative charges. –AlCl 3 is aluminum chloride –LiBr is lithium bromide –Ag 2 S is silver sulfide –MgO is magnesium oxide –KCl is potassium chloride

–lithium ion and bromide ion form LiBr –barium ion and iodide ion form BaI 2 –aluminum ion and sulfide ion form Al 2 S 3 –sodium ion and bicarbonate ion form NaHCO 3 –potassium ion and phosphate ion form K 3 PO 4

For systematic names, use Roman numerals to show charge on the metal ion –CuO is copper(II) oxide –Cu 2 O is copper(I) oxide –FeO is iron(II) oxide –Fe 2 O 3 is iron(III) oxide

–NaNO 3 is sodium nitrate. –CaCO 3 is calcium carbonate. –NaH 2 PO 4 is sodium dihydrogen phosphate. –NH 4 OH is ammonium hydroxide. –FeCO 3 is iron(II) carbonate. –Fe 2 (CO 3 ) 3 is iron(III) carbonate. –CuSO 4 is copper(II) sulfate.

Molecular compound:Molecular compound: a compound in which all bonds are covalent. Naming binary molecular compounds: –prefixes “di-”, tri-”, etc. are used to show the number of atoms of each element; the prefix “mono-” is omitted when it refers to the first atom, and is rarely used with the second atom. Exception: carbon monoxide –NO is nitrogen monoxide (nitric oxide) –SF 2 is sulfur difluoride –N 2 O is dinitrogen monoxide (laughing gas)

1. Determine the number of valence electrons in the molecule. 2. Determine the arrangement of atoms in the molecule. 3. Connect the atoms by single bonds. 4. Show bonding electrons as a single line; show nonbonding electrons as a pair of Lewis dots. single bond double bondtriple bond 5. In a single bond, atoms share one pair of electrons; in a double bond, they share two pairs, and in a triple bond they share three pairs.

Examples –draw a Lewis structure for hydrogen peroxide, H 2 O 2. –draw a Lewis structure for methanol, CH 3 OH. –draw a Lewis structure for acetic acid, CH 3 COOH.

Draw Lewis Structure & Predict Polarity :