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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Ions and Ionic Compounds

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QUESTION ANSWER

1.

Explain how cations form.

1.

Cations form by losing electrons.

3.

Give the charge each atom takes when it forms an ion. If more than one charge is possible, list both.

  1. K
  2. O
  3. Co

3.

 

  1. 1+
  2. 2−
  3. 2+, 3+

5.

Give the charge each atom takes when it forms an ion. If more than one charge is possible, list both.

  1. Ag
  2. Au
  3. Br

5.

 

  1. 1+
  2. 1+, 3+
  3. 1−

7.

Name the ions from Exercise 3.

7.

  1. the potassium ion
  2. the oxide ion
  3. the cobalt(II) and cobalt(III) ions, respectively

9.

Name the ions from Exercise 5.

9.

  1. the silver ion
  2. the gold(I) and gold(III) ions, respectively
  3. the bromide ion

11.

Give the formula and name for each ionic compound formed between the two listed ions.

  1. Mg2+ and Cl−
  2. Fe2+ and O2−
  3. Fe3+ and O2−

11.

 

  1. magnesium chloride, MgCl2
  2. iron(II) oxide, FeO
  3. iron(III) oxide, Fe2O3

13.

Give the formula and name for each ionic compound formed between the two listed ions.

  1. Cu2+ and F−
  2. Ca2+ and O2−
  3. K+ and P3−

13.

 

  1. copper(II) fluoride, CuF2
  2. calcium oxide, CaO
  3. potassium phosphide, K3P

15.

Give the formula and name for each ionic compound formed between the two listed ions.

  1. K+ and SO42−
  2. NH4+ and S2−
  3. NH4+ and PO43−

15.

  1. potassium sulfate, K2SO4
  2. ammonium sulfide, (NH4)2S
  3. ammonium phosphate, (NH4)3PO4

17.

Give the formula and name for each ionic compound formed between the two listed ions.

  1. Pb4+ and SO42−
  2. Na+ and I3−
  3. Li+ and Cr2O72−

17.

 

  1. lead(IV) sulfate, Pb(SO4)2
  2. sodium triiodide, NaI3
  3. lithium dichromate, Li2Cr2O7

19.

Give the formula and name for each ionic compound formed between the two listed ions.

  1. Ag+ and SO32−
  2. Na+ and HCO3−
  3. Fe3+ and ClO3−

19.

 

  1. silver sulfite, Ag2SO3
  2. sodium hydrogen carbonate, NaHCO3
  3. iron(III) chlorate, Fe(ClO3)3

21.

What is the difference between SO3 and SO32−?

21.

SO3 is sulfur trioxide, while SO32− is the sulfite ion.

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