Exploring Polyatomic Ions and Their Bonding

The video tutorial explains the concept of polyatomic ions, which are groups of atoms bonded together with a net charge. It covers the structure and bonding of nitrate ions, highlighting the presence of both covalent and ionic bonds. The tutorial further explores why polyatomic ions have charges, using examples like hydroxide and ammonium ions to illustrate electron gain and loss, resulting in negative and positive charges, respectively.

What is a polyatomic ion?

• A molecule with no charge

• A clump of atoms with a charge

• A single atom with no charge

• A single atom with a charge

What type of bonds hold the atoms together within a polyatomic ion?

• Hydrogen bonds

• Ionic bonds

• Metallic bonds

• Covalent bonds

In a compound like sodium nitrate, what types of bonds are present?

• Both ionic and covalent bonds

• Only ionic bonds

• Only covalent bonds

• Neither ionic nor covalent bonds

Why do polyatomic ions have a charge?

• Because they are neutral

• Because they are made of metals

• Because they gain or lose electrons to make covalent bonds work

• Because they have an equal number of protons and electrons

How many valence electrons does oxygen have?

• 4

• 2

• 6

• 8

What happens when the oxygen and hydrogen pair in hydroxide ion gains an extra electron?

• It loses its charge

• It gets a negative charge

• It gets a positive charge

• It becomes neutral

What is the formula for hydroxide ion?

• O2H

• OH+

• OH-

• H2O

How many valence electrons does nitrogen have?

• 9

• 3

• 5

• 7

What happens when the nitrogen and hydrogen pair in ammonium ion loses an extra electron?

• It gets a negative charge

• It gets a positive charge

• It becomes neutral

• It loses its charge

What is the formula for ammonium ion?

• NH4-

• NH3

• NH4+

• NH2