One of these pictures represents a solution of HCl and one represents a solution of H₂SO₄. Which is which?

a. <IMAGE>

b. <IMAGE>

The elements in red in the periodic table can form cations having more than one charge. Write the formulas and names of the compounds that are formed between the red cations and the blue anions depicted in the periodic table.

Which of the following ions are likely to form? Explain.

a. Li²⁺

b. K^-

c. Mn³⁺

d. Zn⁴⁺

e. Ne⁺

Write the electron configurations of Co, Co²⁺, and Co³⁺.

Write equations for the loss of an electron by a K atom and the gain of an electron by a K⁺ ion.

What is the difference between an acid and a base?

Write equations to show how the substances listed in Problem 3.75 give ions when dissolved in water.

a. H₂CO₃

b. HCN

c. Mg(OH)₂

d. KOH

Explain why the hydride ion, H^-, has a noble gas configuration.