Chemical Bonds

Which of these describes the elements that would form a covalent bond?

• Metal + nonmetal
• Nonmetal + nonmetal
• Metal + metal
• Metalloid + Nobel gas

Last week we learned about IUPAC nomenclature for ionic compounds. When we name covalent compounds, we follow almost exactly the same rules except for one thing: we use prefixes to indicate the number of atoms of each element in the molecule. In a molecule of H₂O₂ there are two atoms of hydrogen and two atoms of oxygen. Which of the following would be the correct IUPAC name?

• Hydrogen peroxide
• Hydrogen dioxide
• Dihydrogen dioxide
• Hydrogen oxide

Giselle is pairing ions to create stable binary ionic compounds. She knows that the sum of charges of the two ions must be zero in order for the compound to be stable. Which ion could be paired with a potassium ion, K+, to form a stable binary compound?

• beryllium, Be²⁺
• fluorine, F¹⁻
• lithium, Li¹⁺
• oxygen, O²⁻

Which type of compound is formed when potassium and chlorine react?

• ionic
• isotopic
• nuclear
• covalent

What is the molecular formula for the compound cesium oxide?

• CsO
• 2CsO
• CsO₂
• Cs₂O

The following table summarizes melting points for different types of compounds. How does the type of compound relate to its melting point?

• The melting points of ionic and covalent compounds show no relationship.
• The melting points for ionic compounds are lower than for covalent compounds.
• The melting points for ionic compounds are higher than for covalent compounds.
• The melting points for ionic compounds are equal to those for covalent compounds.

Which of the following represents the compound formed when a reaction between aluminum and chlorine takes place?

• Al₃Cl
• AlCl₃
• AlCl
• Al₃Cl₃

Which of the following represent stable ionic compounds? Select ALL that apply.

• BaS
• MgCl₂
• KO
• LiBr₂
• Na₂O

What is the name of the compound BaCl₂

• barium chloride
• dibarium chloride
• barium dichloride
• barium chlorate

What is the name of the compound SO₄?

• sulfur oxide
• sulfur tetraoxide
• sulfoxide
• sulfate