Quiz 6.2 Names and Formulas of Common Compounds

Which substances are not salts?

A) Copper sulfate
B) Calcium chloride
C) Sodium chloride
D) Carbon dioxide
1. A only
2. D only
3. A, B and D
4. These are all salts
This is an electron shell diagram of a potassium atom.

How would the electron shell diagram of a potassium ion (K⁺) differ from this diagram?
1. It would have no electron in the outermost electron shell
2. It would have two electrons in the outermost electron shell
3. Its diagram would be the same as the atom diagram
4. It would have only one electron in the innermost electron shell
Which is the correct ion notation of nitride?
1. N₃⁻
2. 3N⁻
3. N₃⁻
4. N3⁻
Nitride has a charge of -3 and potassium has a charge of +1. How would the formula of the compound, potassium nitride, be written?
1. K₃N
2. KN
3. K₂N
4. KN₂
For every Fe(III) ion in iron(III) bromide, how many bromide ions are there?
1. 3
2. 2
3. 1
4. There is no way to know for certain
Which name is incorrect?
1. Iron chloride
2. Magnesium chloride
3. Calcium chloride
4. Sodium chloride
Of the following ions, which ones are polyatomic?

A) N₃⁻
B) Al³⁻
C) OH⁻
D) Cl⁻
E) Fe³⁺
1. A and C
2. E only
3. A, B and E
4. B and E
Which ionic compound contains Fe³⁺?
1. Fe₂O₃
2. FeO
3. FeSO₄
4. FeCl₂
Cobalt(II) chloride is often added to drying agents as an indicator for the presence of water. When the drying agent is blue it is still active and when it is pink it is exhausted or fully hydrated at which point the drying agent no longer works.

This is what cobalt(II) chloride looks like when it is not hydrated:

This is what cobalt(II) chloride looks like when it is hydrated (exhausted):

Which is the correct chemical formula of hydrated cobalt(II) chloride, or cobalt(II) hexahydrate as it is called?
1. CoCl₂•6H₂0
2. CoCl₃•6H₂O
3. CoCl₂ (H₂0) ₆
4. CoCl₂
Which is a molecular compound?
1. Dinitrogen trioxide
2. Sodium carbonate
3. Sodium carbonate decahydrate
4. Copper(I) nitride