Ionic Compounds and Their Formulas

The video tutorial covers the basics of ionic compounds, focusing on Turner ionic compounds and polyatomic ions. It explains how to identify ionic compounds by the presence of metals and introduces polyatomic ions as charged molecules acting as a unit. The tutorial provides detailed instructions on writing chemical formulas, including the use of parentheses for multiple polyatomic ions. It also introduces the crisscross rule as a shortcut for balancing charges in compound formulas, with practical examples to reinforce learning.

What is the key factor in determining if a compound is ionic?

• Presence of a halogen

• Presence of a noble gas

• Presence of a metal

• Presence of a non-metal

What does the term 'polyatomic ion' refer to?

• A single atom with a charge

• A group of atoms acting as a unit with a charge

• A neutral molecule

• A metal ion

Why are parentheses used in the formulas of Turner ionic compounds?

• To show the number of atoms in a molecule

• To indicate the presence of a metal

• To separate different elements

• To enclose polyatomic ions when there is more than one

How is the formula for sodium sulfate written?

• Na(SO4)2

• Na2(SO4)2

• Na2SO4

• NaSO4

What does the Roman numeral in copper(II) hydroxide indicate?

• The number of hydroxide ions

• The total charge of the compound

• The number of copper atoms

• The charge of the copper ion

What is the formula for ammonium phosphate?

• (NH4)2PO4

• NH4PO4

• (NH4)3PO4

• NH4(PO4)3

What is the crisscross method used for?

• Naming ionic compounds

• Writing formulas for ionic compounds

• Determining the charge of ions

• Balancing chemical equations

In the crisscross method, what is the first step?

• Identify the charges of the ions

• Write the chemical symbols

• Determine the number of atoms

• Balance the equation

What is the correct formula for Tin(IV) sulfate using the crisscross method?

• Sn2(SO4)2

• Sn(SO4)4

• Sn2(SO4)4

• Sn(SO4)2

What is the main difference between phosphate and phosphite?

• Phosphite has a different charge

• Phosphite is a monatomic ion

• Phosphite has one less oxygen atom

• Phosphite is a metal