Chemical Reactions and Properties of Matter

What is the chemical formula for the ionic compound calcium chloride?

• Ca₂Cl
• CaCl₂
• Cl₂Ca
• ClCa₂

What is the chemical formula for potassium oxide?

• K₂O
• KO₂
• PO
• PO₂

The formula of a salt is XCl₂. The X-ion in this salt has 28 electrons. The metal X is

• Ni
• Zn
• Fe
• V

Which compound is an example of a BINARY IONIC compound?

• H₂O
• H₂SO₄
• MgF₂
• SF₆

Sodium, atomic number 11, forms an ionic bond with an atom of an unknown element. What is one possible choice for the other element in the compound?

• fluorine (F)
• neon (Ne)
• gallium (Ga)
• potassium (K)

What is the chemical formula for the binary compound nitrogen dioxide?

• (NO)₂
• 1N2Ox
• NO₂
• nitro1oxide2

The IUPAC name for the common household cleaner, ammonia, is nitrogen trihydride. Identify the formula of ammonia.

• NH
• NH₃
• N₃H
• N₃H₃

NH₃ is nitrogen trihydride (ammonia) and BF₃ is boron trifluoride. What is the name for AlCl₃ and why?

• Aluminum chloride - It does not have the prefix "tri-" since it is ionic.
• Monoaluminum trichloride - There is only one aluminum and it needs the prefix "mono-".
• Aluminum trichloride - It has the prefix "tri-" since it has the same ratio as the other compounds.
• Aluminum chloride - Ionic compounds do not get a prefix on the first name if there is only one of that element.

Iron and sulfur react to yield iron sulfide. Classify this reaction.

8Fe_(s) + S_8(s) → 8FeS_(s

• Synthesis
• Decomposition
• Single replacement
• Double replacement

The equation P + O₂ → P₂O₅ is unbalanced. When balanced, what is the correct coefficient for O₂?

• 1
• 2
• 5
• 10