Covalent Bonding

What is a double bond?

• a bond between two atoms
• one pair of electrons shared between two atoms
• two pairs of electrons shared between two atoms
• James Bond's brother

Water is polar and oil is nonpolar.  What happens when the two liquids are poured into the same container?

• both liquids become nonpolar
• a gas is produced
• the liquids mix well
• the liquids do not mix well

What type of compound consists of molecules that are made of atoms that are covalently bonded?

• ionic

• crystal

• noncovalent

• molecular

Molecular compounds that dissolve in water do not conduct electricity because no ___________________ are present.

• charged ions (particles)
• uncharged ions (particles)
• polar
• nonpolar

Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is:

• polar
• nonpolar
• ionic
• charged

Molecular compounds do not conduct electricity because they:

• break up into ions
• do not break up into ions
• do not dissolve in water
• have high melting points

Fluorine (F₂) is a(n)  _________________                  molecule because the valence electrons are shared equally between the two fluorine atoms.

• polar
• nonpolar
• ionic
• crystal

When two atoms share electrons, a chemical bond is formed. This type of bond is called a(n):

• covalent bond

• ionic bond

• crystal bond

• polyatomic bond

A covalent bond in which electrons are shared unequally is:

• polar

• nonpolar

• ionic

• polyatomic

Which of the following is a characteristic property of molecular compounds?

• low melting points
• high melting points
• high boiling points
• high electric conductivity