YOYO. Write the equation and name for the following ionic compounds: Aluminum oxide Barium chloride Potassium iodide

Transcription

1 YOYO Write the equation and name for the following ionic compounds: Aluminum oxide Barium chloride Potassium iodide

2 Aim: How do you write and name a binary ionic compound with a transition metal with multiple oxidation states? November 2, 2017

3 Think Write Pair Share Knowing what you know about chemistry what do you think these Roman numerals represent? FeCl 2 : iron (II) chloride FeCl 3: iron (III) chloride CuCl 2: copper (II) chloride Cu 2 S: copper (I) sulfide SnCl 2 : tin(ii) chloride PbBr 4 : lead (IV) bromide Protocol: Think about the answer Write down your thoughts Pair with your neighbor and explain in at lest 30 full seconds what you think is going on repeat so other neighbor can share their thoughts Share your discussion with the class

4 Transition Metals and Their Positive Ions Most transition metals (Groups 3-12) and Group 14 metals form 2 or more positive ions Zn 2+, Ag + and Cd 2+ from only one ion

5 So Which Metals Form More Than One Cation? The name of metals with two or more positive ions (cations) use a Roman numeral to identify the ionic charge Element Possible Ions Name of Ion Element Possible Ions Name of Ion Chromium Copper Gold Iron Cr2+ Chromium (II) Pb2+ Lead (II) Lead Cr3+ Chromium (III) Pb4+ Lead (IV) Cu+ Copper (I) Sn2+ Tin (II) Tin Cu2+ Copper (II) Sn4+ Tin (IV) Au+ Gold (I) Au3+ Gold (III) Fe2+ Iron (II) Fe3+ Iron (III)

6

7 Let s Talk Roman Numerals Transition metals with two or more different ions use a Roman numeral after the name of the metal to indicate ionic charge. FeCl 2 : iron (II) chloride FeCl 3: iron (III) chloride CuCl 2: copper (II) chloride Cu 2 S: copper (I) sulfide SnCl 2 : tin(ii) chloride PbBr 4 : lead (IV) bromide

8 Formula: FeCl 2 Name:? To name FeCl 2 1. Determine the charge of the cation using the charge of the anion (Cl - ). 2. Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. 3. Write the anion with an ide ending.

9 Formula: FeCl 2 Name:? To name FeCl 2 1. Determine the charge of the cation using the charge of the anion (Cl - ). Fe ion + 2 Cl - = Fe ion + 2 (-1) = 0 Fe ion = Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. Fe 2+ = iron(ii) 3. Write the anion with an ide ending. FeCl 2 = iron(ii) chloride

10 Formula: Cr 2 O 3 Name:? To name Cr 2 O 3 1. Determine the charge of cation from the anion (O 2- ). 2. Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. 3. Write the anion with an ide ending.

11 Formula: Cr 2 O 3 Name:? To name Cr 2 O 3 1. Determine the charge of cation from the anion (O 2- ). 2 Cr ions + 3 O 2- = 0 2 Cr ions + 3(2-) = 0 2 Cr ions - 6 = 0 2 Cr ions = +6 Cr ion = 3+ = Cr Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. Cr 3+ = chromium(iii) 3. Write the anion with an ide ending. chromium(iii) oxide = Cr 2 O 3

12 Practice Chemical Formula Cation (+) (Metal) Anion (-) (Nom-metal) Chemical Name MgCl2 KCl AgF FeO PbI4

13 Naming Binary Ionic Compounds With Multiple Oxidation States Summary 1. Determine if the metal is a transition metal 2. If Transition metal, determine the proper oxidation number to use (use the nonmetal to help you figure this out) 3. Write down the name of the metal (use Roman numerals to show oxidation state for transition metals) 4. Write the name of the non-metal, changing the ending to - ide

14 2-Minute Practice Name that Compound! NaF 2 CuO Al 2 O 3 Cu 2 O SnF 2

15 Formula Predictions for Ionic Compounds Use electron dot structures to predict the formulas of the ionic compounds formed from the following elements: Potassium and oxygen Magnesium and nitrogen

16 Remember: Atoms of metals lose valence electrons when forming an ionic compound. Atoms of nonmetals gain electrons. Enough atoms of each element must be used in the formula so that electrons lost equal electrons gained.

17

18 Formula: Potassium Sulfide

19 Formula: Iron (III) Chloride

20 Checkpoint Question 1. What is the correct formula for copper (I) nitride? 1. CuN 2. CuN 3 3. Cu 3 N 2. What is the correct formula for lead (IV) oxide 1. PbO 2 2. PbO 3. Pb 2 O 4

21 Writing Formulas for Binary Ionic Compounds When Given the Name Summary 1. Write down the Chemical Symbols for each element 2. Determine if the metal is a transition metal. (If a roman numeral is used, it is a transition metal) 3. Using oxidation numbers, determine how many of each element are needed. 4. Write the final formula

22 2-Minute Practice: What is the formula? 1. Aluminum nitride 2. Aluminum oxide 3. Gold (I) oxide