6.3 naming compounds

6.3 Naming Compounds and Writing Formulas


• You Will Need:– 2pgs of CN– Worksheet under

the Oil/Water Bottle

• Agenda:– 6.3 Opener– 6.3 Lecture– 6.3 Wksht

• Opener:

• On the top half of the worksheet complete the table as best as you can.


Describing Ionic Compounds

The name of an ionic compound must distinguish the compound from other ionic compounds containing the same elements. The formula of an ionic compound describes the ratio of the ions in the compound.


Binary Ionic CompoundsA compound made from only two elements is a binary compound.

Naming binary ionic compounds, such as sodium chloride and cadmium iodide, is easy.



This table lists eight common anions. The name of an anion is formed by adding the

suffix –ide to the stem of the name of the nonmetal.



Metals With Multiple Ions



A covalently bonded group of atoms that has a positive or negative charge and acts as a unit is a polyatomic ion. Most simple polyatomic ions are anions.



Writing Formulas for Ionic Compounds• The symbol of the cation is first, followed by the

symbol of the anion. • Use subscripts to show the ratio of the ions in the

compound. • Parentheses are used with the subscript for

polyatomic ions. The formula for iron(III) hydroxide is Fe(OH)3.



Writing Formulas for Ionic CompoundsWhat is the formula for the ionic compound calcium chloride?



Read and UnderstandWhat information are you given?

The name of the compound is calcium chloride.



2. List the symbols and charges for the cation and anion.

Ca with a charge of 2+ and Cl with a charge of 1–

3. Determine the ratio of ions in the compound.

It takes two 1– charges to balance the 2+ charge. There will be two chloride ions for each calcium ion.

4. Write the formula for calcium chloride.CaCl2



1. Write the formula for the compound calcium oxide.



1. Write the formula for the compound calcium oxide.

Answer: It takes one calcium ion with a charge of 2+ to balance one oxide ion with a charge of 2–. The formula is CaO.



2. Write the formula for the compound copper(I) sulfide.



2. Write the formula for the compound copper(I) sulfide.

Answer: It takes two copper (I) ions , each with a charge of 1+, to balance one sulfide ion with a charge of 2–. The formula is Cu2S.



3. Write the formula for the compound sodium sulfate.



3. Write the formula for the compound sodium sulfate.

Answer: It takes two sodium ions, each with a charge of 1+, to balance one sulfate ion with a charge of 2–. The formula is Na2SO4.



4. What is the name of the compound whose formula is NaOH?



4. What is the name of the compound whose formula is NaOH?

Answer: In the formula, Na represents the sodium ion, and OH represents the hydroxide ion. The name of the compound is sodium hydroxide.


6.3 naming compounds

Documents

describing

describing

describing

describing

compound calcium

compound sodium

ionic compounds

calcium ion