Name: Date: Class: a. How many barium ions are there per formula unit (compound)? b. How many nitride ions are there per formula unit (compound)?
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1 NOTES Name: Date: Class: Lessn 15 Part 2: Binary II Inic Bnding, Plyatmic Ins Bx 1: 1. Ba 3N 2 is the frmula fr. (name) a. Hw many barium ins are there per frmula unit (cmpund)? b. Hw many nitride ins are there per frmula unit (cmpund)? 2. Li 2S is the frmula fr. (name) a. Hw many lithium ins are there per frmula unit (cmpund)? b. Hw many sulfide ins are there per frmula unit (cmpund)? 3. Write a sentence t describe what is happening in the figure. PROPERTIES OF IONIC COMPOUNDS: Inic cmpunds have and pints. Melting = substance changes phase frm a t a Biling = substance changes phase frm a t a Why? (a lt f ) is required t vercme the between catins and anins. Example: Table salt (NaCl) has a melting pint f! Zinc chlride (ZnCl 2) has a melting pint f 554 F! 6 th Grade Inic Bnding Part 2 1
2 Inic cmpunds have a. Catins and anins t frm a three-dimensinal structure. Inic cmpunds are. Why? The psitive catins and negative anins are and. Define brittle = Inic cmpunds when (in ). In water, the ins (mve apart) and freely mve thrugh the slutin. inic cmpunds ( ) als cnduct electricity. Inic cmpunds are. BINARY II IONIC COMPOUNDS: Fr Binary II inic cmpunds, the metal frms types f catins. Binary II metals = Still, these are IONIC bnds, s the metals transfer electrns t, resulting in the frmatin f and. Then, the and are t ne anther and frm a bnd. 6 th Grade Inic Bnding Part 2 2
3 Naming: The rules fr naming these cmpunds are almst same as fr naming Binary I, BUT must be included as a. Yu still t the ending f the. Examples: irn (II) sulfide = The irn catin has a +2 charge. Therefre, ne Fe 2+ catin balances ut ne S 2- anin. manganese (IV) xide = EXAMPLE 1: If an inic bnd is frmed between ne irn (Fe) atm and ne nitrgen (N) atm a) What is the charge f the Fe in? b) What is the chemical frmula? c) What is the name? Step One: Find the charge f the anin. Step Tw: Figure ut the ttal negative charge (charge f anin number f anins) Step Three: Find the catin s charge (and hw many is required t balance ut the negative charge). Step Fur: Write the name f the cmpund, representing the charge f the catin as a Rman numeral. 6 th Grade Inic Bnding Part 2 3
4 Bx 2: Match the term with the crrect definitin / descriptin. The definitins may be used mre than nce. 1. sublimatin A. slid liquid 2. biling B. liquid slid 3. melting C. gas slid 4. depsitin D. slid gas 5. cndensatin E. liquid gas 6. vaprizatin F. gas liquid 7. evapratin 8. freezing Bx 3: 1. Water changing frm liquid t gas is an example f a physical / chemical change. 2. Melted wax cling int slid wax is an example f a physical / chemical change. 3. A candle wick burning is an example f a physical / chemical change. 4. A piece f irn rusting is an example f a physical / chemical change. 5. At rm temperature, liquid nitrgen bils. This is an example f a physical / chemical change. 6. At rm temperature, slid carbn dixide sublimes int carbn dixide gas. This is an example f a physical / chemical change. Bx 4: Label the arrws t name each phase change. 6 th Grade Inic Bnding Part 2 4
5 EXAMPLE 2: If an inic bnd is frmed between ne manganese (Mn) atm and tw selenium (Se) atms a) What is the charge f the Mn in? b) What is the chemical frmula? c) What is the name? EXAMPLE 3: If an inic bnd is frmed between three vanadium (V) atms and five nitrgen (N) atms a) What is the charge f each V in? b) What is the chemical frmula? c) What is the name? EXAMPLE 4: What is the name f Au 2O? One way t slve: 1. Use the subscripts t place the crrect number f each in n the see-saw. 2. Write the charge f the anin. 3. Find the charge f the catin s that the psitive and negative charges balance. 6 th Grade Inic Bnding Part 2 5
6 [Example 4 cntinued What is the name f Au 2O?] Anther way t slve: 1. Setup the fllwing frmula: C(x) + A(y) = 0 a. C = number f catins (yu get this frm the subscript next t the metal) b. A = number f anins (yu get this frm the subscript next t the nnmetal) c. x = charge f the catin (unknwn fr Binary II) d. y = charge f the anin (yu get this by lking at the Grup # the element is in) 2. Slve fr x. Practice: Name the fllwing cmpunds. Yu may use either methd t slve (see-saw r equatin). 1. Au 2S 2. HgO 3. MnCl 6 4. CrP 5. Fe 2O 3 6. SnF 4 6 th Grade Inic Bnding Part 2 6
7 7. Cu 2S 8. ScCl 3 9. PbS RuN 2 Mnatmic Ins vs. Plyatmic Ins Mnatmic ins = Examples: Plyatmic ins = Examples: List f Plyatmic Ins yu will need t memrize: + 2- Ammnium NH 4 Carbnate CO 3 Hydrxide OH - Sulfate SO 4 2- Nitrate NO 3 - Phsphate PO 4 3- Yu ll need t memrize the frmulas and charges f these s yu can apply them t inic bnding. 6 th Grade Inic Bnding Part 2 7
8 Naming: If a cmpund has a plyatmic in, use the name f the plyatmic in (n changes). Mnatmic ins are still named by the rules yu learned fr Binary I and Binary II. Other ntes: When writing chemical frmulas, nly if there are multiple plyatmic ins per frmula unit = Plyatmic anins can bnd with metal catins. PRACTICE: Cunting Atms Li 2SO 4 (NH 4) 2S NaOH Rb 3PO 4 Element # f atms Element # f atms Element # f atms Element # f atms Ttal Ttal Ttal Ttal Sr(OH) 2 Cr(NO 3) 3 MgCO 3 Cr(PO 4) 3 Element # f atms Element # f atms Element # f atms Element # f atms Ttal Ttal Ttal Ttal 6 th Grade Inic Bnding Part 2 8
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