Question

ec4 review/hw
name:
binary ionic compounds with transition metals
transition metals have unpredictable charges.
list the six that are on your oxidation chart with roman numerals
to show they can vary. (striped 3s and 5s on coloring sheets too)

ions\tnames\tions\tnames
_____\t_____________________\t___\t_______________________
_____\t_____________________\t___\t_______________________
_____\t_____________________\t___\t_______________________

ionic compound names and formulas
a. write the ions, and then the correct chemical formula for these compounds by using the criss cross rule.

name\tions\tcompound formula

1. lead (ii) chloride\t_____\t_____
2. copper (ii) iodide\t_____\t_____
3. manganese fluoride\t_____\t_____
4. tin (iv) nitride\t_____\t_____
5. iron (iii) phosphide\t_____\t_____
6. sodium iodide\t_____\t_____
7. caesium phosphide\t_____\t_____

a. find the ions that make up these compounds, then the name. a few are done for you as examples.

1. ag₂s \t__________________\tsilver sulfide\t8 pbf₄ \t__________________\tlead (iv) fluoride
2. zno \t__________________\tzinc oxide\t9. ga₂o₃ \t__________________
3. cuf \t__________________\t\t10 cscl \t__________________
4. cubr₂ \t__________________\t\t11. v₂o₃ \t__________________
5. mncl₂ \t__________________\t\t12. mg₃n₂ \t__________________
6. snbr₂ \t__________________\t\t13. hg₂o \t__________________
7. rb₂o \t__________________\t\t14. hgo \t__________________

Answer:

Part 1: Binary Ionic Compounds with Transition Metals (Listing Ions with Roman Numerals)

Common transition metals with variable charges (from oxidation charts) include:

• $\boldsymbol{\ce{Fe^{2+}}}$, Iron(II); $\boldsymbol{\ce{Fe^{3+}}}$, Iron(III)
• $\boldsymbol{\ce{Cu^{+}}}$, Copper(I); $\boldsymbol{\ce{Cu^{2+}}}$, Copper(II)
• $\boldsymbol{\ce{Mn^{2+}}}$, Manganese(II); $\boldsymbol{\ce{Mn^{3+}}}$, Manganese(III)
• $\boldsymbol{\ce{Sn^{2+}}}$, Tin(II); $\boldsymbol{\ce{Sn^{4+}}}$, Tin(IV)
• $\boldsymbol{\ce{Pb^{2+}}}$, Lead(II); $\boldsymbol{\ce{Pb^{4+}}}$, Lead(IV)
• $\boldsymbol{\ce{Hg^{+}}}$ (as $\ce{Hg2^{2+}}$), Mercury(I); $\boldsymbol{\ce{Hg^{2+}}}$, Mercury(II)

Part 2: Ionic Compound Names and Formulas (A: Write Ions + Formula via Criss-Cross)

1. Lead (II) Chloride

• Ions: $\ce{Pb^{2+}}$ (lead(II)), $\ce{Cl^-}$ (chloride)
• Criss-cross: Charge of $\ce{Pb^{2+}}$ becomes subscript of $\ce{Cl^-}$; charge of $\ce{Cl^-}$ becomes subscript of $\ce{Pb^{2+}}$.
• Formula: $\ce{PbCl2}$

2. Copper (II) Iodide

• Ions: $\ce{Cu^{2+}}$ (copper(II)), $\ce{I^-}$ (iodide)
• Criss-cross: $2$ (from $\ce{Cu^{2+}}$) → subscript of $\ce{I^-}$; $1$ (from $\ce{I^-}$) → subscript of $\ce{Cu^{2+}}$ (omitted if 1).
• Formula: $\ce{CuI2}$

3. Manganese Fluoride (Assume Mn(II) unless stated otherwise)

• Ions: $\ce{Mn^{2+}}$ (manganese(II)), $\ce{F^-}$ (fluoride)
• Criss-cross: $2$ → subscript of $\ce{F^-}$; $1$ → subscript of $\ce{Mn^{2+}}$.
• Formula: $\ce{MnF2}$

4. Tin (IV) Nitride

• Ions: $\ce{Sn^{4+}}$ (tin(IV)), $\ce{N^{3-}}$ (nitride)
• Criss-cross: Charge of $\ce{Sn^{4+}}$ ($4$) → subscript of $\ce{N^{3-}}$; charge of $\ce{N^{3-}}$ ($3$) → subscript of $\ce{Sn^{4+}}$.
• Formula: $\ce{Sn3N4}$ (Simplify: GCD of 4 and 3 is 1, so subscripts remain 3 and 4.)

5. Iron (III) Phosphide

• Ions: $\ce{Fe^{3+}}$ (iron(III)), $\ce{P^{3-}}$ (phosphide)
• Criss-cross: Charge of $\ce{Fe^{3+}}$ ($3$) → subscript of $\ce{P^{3-}}$; charge of $\ce{P^{3-}}$ ($3$) → subscript of $\ce{Fe^{3+}}$.
• Formula: $\ce{FeP}$ (Subscripts simplify to 1: $3/3 = 1$.)

6. Sodium Iodide

• Ions: $\ce{Na^+}$ (sodium), $\ce{I^-}$ (iodide)
• Criss-cross: $1$ (from $\ce{Na^+}$) → subscript of $\ce{I^-}$; $1$ (from $\ce{I^-}$) → subscript of $\ce{Na^+}$ (omitted).
• Formula: $\ce{NaI}$

7. Caesium Phosphide

• Ions: $\ce{Cs^+}$ (caesium), $\ce{P^{3-}}$ (phosphide)
• Criss-cross: $3$ (from $\ce{P^{3-}}$) → subscript of $\ce{Cs^+}$; $1$ (from $\ce{Cs^+}$) → subscript of $\ce{P^{3-}}$.
• Formula: $\ce{Cs3P}$

Part 3: Find Ions + Name (A: Compounds to Ions + Name)

1. $\ce{Ag2S}$

• Ions: $\ce{Ag^+}$ (silver), $\ce{S^{2-}}$ (sulfide)
• Name: Silver sulfide (done as example)

2. $\ce{ZnO}$

• Ions: $\ce{Zn^{2+}}$ (zinc), $\ce{O^{2-}}$ (oxide)
• Name: Zinc oxide (done as example)

3. $\ce{CuF}$

• Ions: $\ce{Cu^+}$ (copper(I)), $\ce{F^-}$ (fluoride)
• Name: Copper(I) fluoride

4. $\ce{CuBr2}$

• Ions: $\ce{Cu^{2+}}$ (copper(II)), $\ce{Br^-}$ (bromide)
• Name: Copper(II) bromide

5. $\ce{MnCl2}$

• Ions: $\ce{Mn^{2+}}$ (manganese(II)), $\ce{Cl^-}$ (chloride)
• Name: Manganese(II) chloride

6. $\ce{SnBr2}$

• Ions: $\ce{Sn^{2+}}$ (tin(II)), $\ce{Br^-}$ (bromide)
• Name: Tin(II) bromide

7. $\ce{Rb2O}$

• Ions: $\ce{Rb^+}$ (rubidium), $\ce{O^{2-}}$ (oxide)
• Name: Rubidium oxide

8. $\ce{PbF4}$

• Ions: $\ce{Pb^{4+}}$ (lead(IV)), $\ce{F^-}$ (fluoride)
• Name: Lead(IV) fluoride (done as example)

9. $\ce{Ga2O3}$

• Ions: $\ce{Ga^{3+}}$ (gallium), $\ce{O^{2-}}$ (oxide)
• Name: Gallium oxide (or Gallium(III) oxide, but Ga is main group, charge is fixed at +3)

10. $\ce{CsCl}$

• Ions: $\ce{Cs^+}$ (caesium), $\ce{Cl^-}$ (chloride)
• Name: Caesium chloride

11. $\ce{V2O5}$ (Note: Original problem has $\ce{V2O3}$? Wait, $\ce{V2O3}$: $\ce{V^{3+}}$, $\ce{O^{2-}}$)

• Ions: $\ce{V^{3+}}$ (vanadium(III)), $\ce{O^{2-}}$ (oxide)
• Name: Vanadium(III) oxide

12. $\ce{Mg3N2}$

• Ions: $\ce{Mg^{2+}}$ (magnesium), $\ce{N^{3-}}$ (nitride)
• Name: Magnesium nitride

13. $\ce{Hg2O}$

• Ions: $\ce{Hg2^{2+}}$ (mercury(I)), $\ce{O^{2-}}$ (oxide)
• Name: Mercury(I) oxide

14. $\ce{HgO}$

• Ions: $\ce{Hg^{2+}}$ (mercury(II)), $\ce{O^{2-}}$ (oxide)
• Name: Mercury(II) oxide

Summary (Key Answers for Each Sub-Question)

(Note: For the "Binary Ionic Compounds with Transition Metals" section, list 6 ions with Roman numerals, e.g., $\ce{Fe^{2+}}$ (Iron(II)), $\ce{Fe^{3+}}$ (Iron(III)), $\ce{Cu^{+}}$ (Copper(I)), $\ce{Cu^{2+}}$ (Copper(II)), $\ce{Mn^{2+}}$ (Manganese(II)), $\ce{Sn^{4+}}$ (Tin(IV))).

For the "Ionic Compound Names and Formulas" (A) and (A) sections, the above steps provide the ions, formulas, and names.

If you need specific answers for a particular sub-question, reference the corresponding step!