Ammonium Ion and Its Properties

The video tutorial explains the ammonium ion (NH4+), its formula, and its significance in chemistry as a common positive polyatomic ion. It describes the molecular geometry of NH4+ as tetrahedral and details its formation from ammonia (NH3) and a hydrogen ion (H+). The tutorial also covers examples of compounds containing the ammonium ion, such as ammonium chloride (NH4Cl) and ammonium nitrate (NH4NO3), highlighting their ionic nature.

What is the chemical formula for the ammonium ion?

• NH2-

• NH4-

• NH4+

• NH3

Why is it recommended to memorize the ammonium ion formula?

• It's rarely used in chemistry.

• It's a common positive polyatomic ion.

• It's a negative ion.

• It's only used in biology.

What is the molecular geometry of the ammonium ion?

• Bent

• Tetrahedral

• Trigonal planar

• Linear

How many lone pairs are present on the ammonium ion?

• One

• Three

• Two

• None

What is the starting molecule used to form the ammonium ion?

• Methane (CH4)

• Water (H2O)

• Oxygen (O2)

• Ammonia (NH3)

Which ion is added to ammonia to form the ammonium ion?

• Cl-

• Na+

• OH-

• H+

What is the charge on the chloride ion in ammonium chloride?

• 0

• +2

• -1

• +1

What type of bond is formed between ammonium ion and nitrate ion in ammonium nitrate?

• Covalent

• Hydrogen

• Ionic

• Metallic

Which of the following is an example of a compound containing the ammonium ion?

• Sulfuric acid

• Ammonium chloride

• Sodium chloride

• Calcium carbonate

What is the overall charge of the ammonium ion?

• +2

• Neutral

• -1

• +1