2.4 Review Questions 1. In each case below, write out the chemical equation for the association of the ions that form the given binary ionic compound. Example: magnesium phosphide 3 Mg2+ + 2 P3Mg3P2 (a) sodium fluoride Na + +F - → NaF
→
2+
-
+ 2Br → FeBr2
(b) iron(II) bromide
Fe
(c) tin(IV) chloride
Sn4+ + 4Cl- → SnCl4
(d) chromium(III) sulfide
2Cr3+ + 2S2- → Cr2 S3
2. Write the formulas of the following binary ionic compounds: (a) chromium(III) chloride CrCl2 (b) aluminum fluoride
AlF3
(c) magnesium iodide MgI2 (d) tin(IV) oxide SnO2
3. Write the names of the following binary ionic compounds: (a) K2O potassium oxide (b) ZnBr2 zinc bromide (c) PbO2 lead(IV) oxide (d) HgCl2 mercury(I) chloride
5. In each case below, write out the chemical equation for the association of the ions that form the given ionic compound, Example: magnesium nitrate Mg(NO3)2 Mg2+ + 2 NO3-
→
(a) sodium nitrite (b) silver phosphate
-
Na+ + NO2 → NaNO2 3Ag+ + PO34 → Ag PO4 3
(c) lithium ethanoate (lithium acetate)
Li+ + CH3 COO- → LiCH3 COO
(d) chromium(III) oxalate
2Cr3+ + 3C2 O2→ Cr2 (C2 O4 ) 4
3
6. Write the formulas of the following ionic compounds: (a) copper(I) perchlorate CuClO4 (b) calcium bisulfide Ca(HS)2 (c) aluminum monohydrogen phosphate Al2(HPO4)3 (d) magnesium hydroxide Mg(OH)2 7. Write the names of the following ionic compounds: (a) Ba3(PO4)2 barium phosphate (b) Fe(HSO3)2 iron(II) bisulphite (c) Pb(HC2O4)4 lead(IV) binoxalate (d) CuH2PO4 copper(I) dihydrogen phosphate 8. Many minerals contain three types of ions. You can mine several minerals of copper including two forms of copper(II) carbonate hydroxide. malachite 2 Cu2+ + CO32- + 2 OHCu2(CO3)(OH)2 4+ + 2– + 2– = 0 azurite 3 Cu2+ + 2 CO32- + 2 OHCu3(CO3)2(OH)2 6+ + 4– + 2– = 0 Notice that more than one ratio of the ions results in their charges cancelling. Thus there is more than one possible compound of three ion combinations. Write a possible formula for: (a) iron(III) sodium chromate for e.g. FeNa(CrO4)2 or FeNa3(CrO4)3
→
4. Write the name and formula of the binary ionic compound formed by: (a) potassium and chlorine potassium chloride KCl (b) manganese(IV) and oxygen manganese(IV) oxide MnO2 (c) iron(III) and sulfur iron(III) sulphide Fe2S3
(d) copper(II) and iodine
→
(b) zinc sulfate nitrate for e.g. Zn2(SO4)(NO3)2 or Zn3(SO4)2(NO3)2
copper(II) iodide CuI2
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Chapter 2 The Nature of Matter 45