Naming ionic compounds for a test

What is an ionic compound?

An ionic compound consists of charged ions held together by electrostatic forces.

NaCl

Common name: Sodium chloride; it's table salt, formed from Na+ and Cl- ions.

Difference between cation and anion

Cations are positive ions, while anions are negative ions.

True or False: Ionic compounds are formed by covalent bonds.

False, because ionic compounds are formed by ionic bonds.

What is the naming rule for cations?

They are named after the element, followed by 'ion.' Example: Na+ is sodium ion.

What is the naming rule for anions?

They drop the element's ending and add '-ide.' Example: Cl- is chloride.

K2O

Name it: Potassium oxide; consists of 2 K+ ions and 1 O2- ion.

Fill in the blank: MgCl2 is named _______.

Magnesium chloride.

What is the formula for aluminum sulfate?

The formula is Al2(SO4)3, containing aluminum ions and sulfate ions.

True or False: Polyatomic ions can be part of ionic compounds.

True, because polyatomic ions like sulfate (SO4^2-) are common in compounds.

Difference between naming binary and ternary ionic compounds

Binary compounds have two elements; ternary compounds have three or more.

What is the formula for calcium phosphate?

The formula is Ca3(PO4)2; it includes calcium and phosphate ions.

Fe2O3

Name it: Iron(III) oxide; iron has a +3 oxidation state here.

What do you call a negatively charged ion?

It's called an anion.

CaCl2

Name it: Calcium chloride; formed from Ca2+ and Cl- ions.

True or False: The charge of an ionic compound is always neutral.

True, because ionic compounds must have an overall charge of zero.

NH4Cl

Name it: Ammonium chloride; contains the ammonium ion (NH4+).