Problem 35
If an atom gains an electron to become an ion, what kind of electrical charge does the ion have?
Problem 36
How many electrons has a nitrogen atom gained if it has formed the ion \(\mathrm{N}^{3-}\) ? How many protons and electrons are in an \(\mathrm{N}^{3-}\) ion?
Problem 39
A student wrote the formula for an ionic compound of titanium as \(\mathrm{Ti}_{2} \mathrm{O}_{4}\). What is wrong with this formula? What should the formula be?
Problem 41
What are the formulas (including charges) for (a) cyanide ion, (b) ammonium ion, (c) nitrate ion, (d) sulfite ion, (e) chlorate ion, and (f) sulfate ion?
Problem 42
What are the formulas (including charges) for (a) hypochlorite ion, (b) bisulfate ion, (c) phosphate ion, (d) dihydrogen phosphate ion, (e) permanganate ion, and (f) oxalate ion?
Problem 44
Write the correct formulas for the compounds formed when the following react (a) calcium and chlorine, (b) magnesium and oxygen, (c) aluminum and oxygen, and (d) sodium and sulfur.
Problem 45
Write the unbalanced equations for the following reactions: (a) Iron(III) hydroxide reacts with hydrogen chloride forming water and iron(III) chloride. (b) Silver nitrate is reacted with barium chloride to form silver chloride and barium nitrate.
Problem 46
Write the unbalanced equations for the following reactions: (a) Propane reacts with oxygen to form carbon dioxide and water. (b) Sodium metal is added to water and the products are sodium hydroxide and hydrogen gas.
Problem 50
Which kind of elements normally combine to form molecular compounds?
Problem 53
Without referring to Table 2.6 but using the periodic table, write chemical formulas for the simplest hydrogen compounds of (a) carbon, (b) nitrogen, (c) tellurium, and (d) iodine.
