Writing Formulas + Naming

A compound contains a metal and a nonmetal. What type of compound is it usually?

Ionic compound

A compound contains a cation and an anion. What type of compound is it?

Ionic compound

In an ionic compound, the total positive charge and total negative charge must do what?

Cancel to make the compound neutral

What happens to electrons when an ionic compound forms?

Electrons are transferred

Which ion is written first in an ionic formula?

Cation

Which ion is written second in an ionic formula?

Anion

When writing ionic formulas, what do the charges become?

Subscripts

If the subscripts are not in the lowest whole-number ratio, what should you do?

Reduce them

Why is CaO not written as Ca₂O₂?

The +2 and -2 charges reduce to a 1:1 ratio

What formula forms from Na⁺ and Cl⁻?

NaCl

What formula forms from Mg²⁺ and Cl⁻?

MgCl₂

What formula forms from Al³⁺ and Cl⁻?

AlCl₃

What formula forms from Ca²⁺ and O²⁻?

CaO

What formula forms from Mg²⁺ and O²⁻?

MgO

What formula forms from Al³⁺ and O²⁻?

Al₂O₃

What formula forms from Ba²⁺ and Cl⁻?

BaCl₂

What formula forms from Mg²⁺ and N³⁻?

Mg₃N₂

What formula forms from Na⁺ and O²⁻?

Na₂O

What formula forms from K⁺ and S²⁻?

K₂S

What formula forms from Ca²⁺ and Br⁻?

CaBr₂

What formula forms from Li⁺ and N³⁻?

Li₃N

What formula forms from Al³⁺ and S²⁻?

Al₂S₃

What formula forms from Fe³⁺ and Br⁻?

FeBr₃

What formula forms from Fe²⁺ and Br⁻?

FeBr₂

What formula forms from Cu⁺ and Cl⁻?

CuCl

What formula forms from Cu²⁺ and Cl⁻?

CuCl₂

If a compound contains more than one polyatomic ion, what punctuation is usually needed?

Parentheses

What formula forms from Mg²⁺ and NO₃⁻?

Mg(NO₃)₂

What formula forms from Al³⁺ and NO₃⁻?

Al(NO₃)₃

What formula forms from Ca²⁺ and OH⁻?

Ca(OH)₂

What formula forms from Na⁺ and PO₄³⁻?

Na₃PO₄

What formula forms from Ba²⁺ and PO₄³⁻?

Ba₃(PO₄)₂

What formula forms from NH₄⁺ and SO₄²⁻?

(NH₄)₂SO₄

What formula forms from Mg²⁺ and SO₄²⁻?

MgSO₄

What formula forms from Al³⁺ and SO₄²⁻?

Al₂(SO₄)₃

What formula forms from K⁺ and MnO₄⁻?

KMnO₄

What formula forms from Ca²⁺ and CO₃²⁻?

CaCO₃

What formula forms from Na⁺ and CO₃²⁻?

Na₂CO₃

What formula forms from Pb²⁺ and NO₃⁻?

Pb(NO₃)₂

What formula forms from Pb⁴⁺ and O²⁻?

PbO₂

What is the name of NaCl?

Sodium chloride

What is the name of CaCl₂?

Calcium chloride

What is the name of MgO?

Magnesium oxide

What is the name of Al₂O₃?

Aluminum oxide

What is the name of BaCl₂?

Barium chloride

What is the name of Mg₃N₂?

Magnesium nitride

What is the name of K₂S?

Potassium sulfide

What is the name of Li₃N?

Lithium nitride

What is the name of Al₂S₃?

Aluminum sulfide

What is the name of Mg(NO₃)₂?

Magnesium nitrate

What is the name of Al(NO₃)₃?

Aluminum nitrate

What is the name of Ca(OH)₂?

Calcium hydroxide

What is the name of Na₃PO₄?

Sodium phosphate

What is the name of Ba₃(PO₄)₂?

Barium phosphate

What is the name of (NH₄)₂SO₄?

Ammonium sulfate

What is the name of MgSO₄?

Magnesium sulfate

What is the name of Al₂(SO₄)₃?

Aluminum sulfate

What is the name of KMnO₄?

Potassium permanganate

What is the name of CaCO₃?

Calcium carbonate

What is the name of Na₂CO₃?

Sodium carbonate

Why does FeBr₃ use a Roman numeral in the name?

Iron can form more than one charge

What is the name of FeBr₃?

Iron(III) bromide

What is the name of FeBr₂?

Iron(II) bromide

What is the name of CuCl?

Copper(I) chloride

What is the name of CuCl₂?

Copper(II) chloride

What is the name of Pb(NO₃)₂?

Lead(II) nitrate

What is the name of PbO₂?

Lead(IV) oxide

In iron(III) bromide, what is the charge of iron?

+3

In iron(II) bromide, what is the charge of iron?

+2

In copper(I) chloride, what is the charge of copper?

+1

In copper(II) chloride, what is the charge of copper?

+2

In lead(II) nitrate, what is the charge of lead?

+2

In lead(IV) oxide, what is the charge of lead?

+4

Does sodium need a Roman numeral in ionic compound names?

No

Does magnesium need a Roman numeral in ionic compound names?

No

Does aluminum need a Roman numeral in ionic compound names?

No

Does iron usually need a Roman numeral in ionic compound names?

Yes

Does copper usually need a Roman numeral in ionic compound names?

Yes

Does lead usually need a Roman numeral in ionic compound names?

Yes

Why does Mg(NO₃)₂ need parentheses?

There are two nitrate ions

Why does Al₂(SO₄)₃ need parentheses?

There are three sulfate ions

Why does Na₃PO₄ not need parentheses?

There is only one phosphate ion

How many oxygen atoms are in Mg(NO₃)₂?

6 oxygen atoms

How many oxygen atoms are in Al₂(SO₄)₃?

12 oxygen atoms

How many ammonium ions are in (NH₄)₂SO₄?

2 ammonium ions

How many phosphate ions are in Ba₃(PO₄)₂?

2 phosphate ions

Which compound is ionic: N₂O₃ or CaCl₂?

CaCl₂

Which compound is ionic: C₂H₃SH or NH₄Br?

NH₄Br

Why is NH₄Br ionic even though it has only nonmetals?

It contains the ammonium ion

Which name/formula pair is incorrect: Mg(NO₃)₂ magnesium nitrate or Mg₃N₂ magnesium nitrite?

Mg₃N₂ magnesium nitrite

What is the correct name for Mg₃N₂?

Magnesium nitride