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Name the following ionic compounds: (a) \(\mathrm{MgO}\), (b) \(\mathrm{AlCl}_{3}\), (c) \(\mathrm{Li}_{3} \mathrm{PO}_{4}\), (d) \(\mathrm{Ba}\left(\mathrm{ClO}_{4}\right)_{2}\), (e) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) (f) \(\mathrm{Fe}(\mathrm{OH})_{2},(\mathrm{~g}) \mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}\), (h) \(\mathrm{Cr}_{2}\left(\mathrm{CO}_{3}\right)_{3}\), (i) \(\mathrm{K}_{2} \mathrm{CrO}_{4}\) (j) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}\)

Short Answer

Expert verified
(a) Magnesium oxide (b) Aluminum chloride (c) Lithium phosphate (d) Barium perchlorate (e) Copper(II) nitrate (f) Iron(II) hydroxide (g) Calcium acetate (h) Chromium(III) carbonate (i) Potassium chromate (j) Ammonium sulfate

Step by step solution

01

Identify cations and anions in each compound

For each compound, let's identify the cation and anion and list them for easier use in naming the compound. (a) \(\mathrm{MgO}:\) Cation = \(\mathrm{Mg}^{2+}\) (magnesium), Anion = \(\mathrm{O}^{2-}\) (oxide) (b) \(\mathrm{AlCl}_{3}:\) Cation = \(\mathrm{Al}^{3+}\) (aluminum), Anion = \(\mathrm{Cl}^{-}\) (chloride) (c) \(\mathrm{Li}_{3} \mathrm{PO}_{4}:\) Cation = \(\mathrm{Li}^{+}\) (lithium), Anion = \(\mathrm{PO}_{4}^{3-}\) (phosphate) (d) \(\mathrm{Ba}\left(\mathrm{ClO}_{4}\right)_{2}:\) Cation = \(\mathrm{Ba}^{2+}\) (barium), Anion = \(\mathrm{ClO}_{4}^{-}\) (perchlorate) (e) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}:\) Cation = \(\mathrm{Cu}^{2+}\) (copper(II)), Anion = \(\mathrm{NO}_{3}^{-}\) (nitrate) (f) \(\mathrm{Fe}(\mathrm{OH})_{2}:\) Cation = \(\mathrm{Fe}^{2+}\) (iron(II)), Anion = \(\mathrm{OH}^{-}\) (hydroxide) (g) \(\mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}:\) Cation = \(\mathrm{Ca}^{2+}\) (calcium), Anion = \(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}^{-}\) (acetate) (h) \(\mathrm{Cr}_{2}\left(\mathrm{CO}_{3}\right)_{3}:\) Cation = \(\mathrm{Cr}^{3+}\) (chromium(III)), Anion = \(\mathrm{CO}_{3}^{2-}\) (carbonate) (i) \(\mathrm{K}_{2} \mathrm{CrO}_{4}:\) Cation = \(\mathrm{K}^{+}\) (potassium), Anion = \(\mathrm{CrO}_{4}^{2-}\) (chromate) (j) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}:\) Cation = \(\mathrm{NH}_{4}^{+}\) (ammonium), Anion = \(\mathrm{SO}_{4}^{2-}\) (sulfate)
02

Combine cation and anion names

Now that we have identified the cation and anion for each compound, let's combine their names to form the name of the compound. (a) Magnesium oxide (b) Aluminum chloride (c) Lithium phosphate (d) Barium perchlorate (e) Copper(II) nitrate (f) Iron(II) hydroxide (g) Calcium acetate (h) Chromium(III) carbonate (i) Potassium chromate (j) Ammonium sulfate

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Naming Ionic Compounds
Naming ionic compounds can seem tricky at first, but with a few simple rules, it becomes straightforward. Ionic compounds consist of positive and negative ions held together by ionic bonds.
When naming these, first identify the cation (positive ion) and the anion (negative ion). The name of the cation is stated first followed by the name of the anion.
  • If the cation is a metal from groups 1, 2, or transitional metals with a known charge, simply write the metal's name (e.g., magnesium for \( \text{Mg}^{2+} \) ).
  • If the metal can form more than one type of cation, like copper (Cu), specify its charge using Roman numerals in parentheses, such as copper(II) for \( \text{Cu}^{2+} \) .
  • The name of the anion usually ends with "-ide" if it is a simple anion like chloride (\( \text{Cl}^{-} \) ), "-ate" or 鈥-ite鈥 if it鈥檚 a polyatomic ion such as sulfate (\( \text{SO}_4^{2-} \) ).

Examples include magnesium oxide (\( \text{MgO} \)) and lithium phosphate (\( \text{Li}_3 \text{PO}_4 \)). With practice, naming ionic compounds becomes much easier.
Cations and Anions
Cations and anions are the building blocks of ionic compounds. Cations are positively charged ions, while anions carry a negative charge.
These charges result from a metal losing electrons and a non-metal gaining those electrons, respectively.
  • Cations are often metals. For instance, a magnesium ion \( \text{Mg}^{2+} \) is a cation that has lost two electrons.
  • Anions are often non-metals or polyatomic ions, tables. Oxygen becomes an oxide ion \( \text{O}^{2-} \), by gaining two electrons.

In transition metals and some post-transition metals, multiple charges may be possible and are denoted using Roman numerals such as iron(II) \( \text{Fe}^{2+} \) . Unlike a trickle of water, ions engage in a captivating dance of attractions with their opposite charges guiding their every move.

The balance between these charges is crucial because it ensures the compound is neutral, having an overall charge of zero.
Polyatomic Ions
Polyatomic ions consist of multiple atoms bonded together that function as a single ion with a positive or negative charge. They are often critical components of ionic compounds.
The atoms in a polyatomic ion are covalently bonded, but the ion itself forms ionic bonds with cations or anions.
  • Common polyatomic ions include nitrate (\( \text{NO}_3^{-} \)), sulfate (\( \text{SO}_4^{2-} \)), and phosphate (\( \text{PO}_4^{3-} \)).
  • When included in ionic compounds, the polyatomic ion is treated as a single unit. For instance, in ammonium sulfate \( (\text{NH}_4)_2\text{SO}_4 \), ammonium \( \text{NH}_4^+ \) and sulfate \( \text{SO}_4^{2-} \) ions work together to create a stable compound.

These ions have their unique names, which are essential to learn, as their presence alters the naming and writing of chemical formulas. Polyatomic ions transform the naming game, asking you to find balance along with color connections in a complex world.

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Most popular questions from this chapter

Selenium, an element required nutritionally in trace quantities, forms compounds analogous to sulfur. Name the following ions: (a) \(\mathrm{SeO}_{4}{ }^{2-}\), (b) \(\mathrm{Se}^{2-}\), (c) HSe, (d) \(\mathrm{HSeO}_{3}^{-}\).

Does the following drawing represent a neutral atom or an ion? Write its complete chemical symbol including mass number, atomic number, and net charge (if any). [Sections \(2.3\) and \(2.7]\)

(a) What is a functional group? (b) What functional group characterizes an alcohol? (c) With reference to Exercise \(2.75\), write a structural formula for 1 -butanol, the alcohol derived from butane, by making a substitution on one of the end carbon atoms.

From the following list of elements \(-\mathrm{Ar}, \mathrm{H}, \mathrm{Ga}, \mathrm{Al}, \mathrm{Ca}\), \(\mathrm{Br}, \mathrm{Ge}, \mathrm{K}, \mathrm{O}-\) pick the one that best fits each description. Use each element only once: (a) an alkali metal, (b) an alkaline earth metal, (c) a noble gas, (d) a halogen, (e) a metalloid, (f) a nonmetal listed in group \(1 \mathrm{~A},(\mathrm{~g})\) a metal that forms a \(3+\) ion, \((h)\) a nonmetal that forms a \(2-\) ion, (i) an element that resembles aluminum.

A cube of gold that is \(1.00 \mathrm{~cm}\) on a side has a mass of \(19.3\) g. A single gold atom has a mass of \(197.0\) amu. (a) How many gold atoms are in the cube? (b) From the information given, estimate the diameter in \(\AA\) of a single gold atom. (c) What assumptions did you make in arriving at your answer for part (b)?

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