Unit 4 Quiz 3

Which compound contains only nonpolar covalent bonds? O2 CO2 H2O NO3

O2

What is the best reason for the difference in properties of LiCl and C6H14O? LiCl and C6H14O have different atomic masses. Cl and O belong to different groups of the periodic table. One compound is ionic, and the other is metallic. One compound is covalent, and the other is ionic.

One compound is covalent, and the other is ionic.

Some atoms are exceptions to the octet rule by having an expanded octet. Which characteristic is needed for an atom to have an expanded octet? The atom has empty d-orbitals. The atom has more than eight valence electrons before bonding. The atom has empty p-orbitals. The atom has fewer than eight valence electrons after bonding.

The atom has empty d-orbitals.

Which statement about covalent compounds is true? They are able to melt at high temperatures. They are poor conductors of heat. They have strong intermolecular attractions. They have atomic bonds that are easy to break.

They are poor conductors of heat.

Which statement describes a property of covalent compounds? They have a high boiling point because of strong intermolecular forces. They have a low boiling point because of weak intermolecular forces. They have a low melting point because of strong intermolecular forces. They have a high melting point because of weak intermolecular forces.

They have a low boiling point because of weak intermolecular forces.

A solid compound in a sealed container was kept at a very low temperature in a freezer. When placed at room temperature, the substance quickly turned into a liquid. This compound is most likely which of the following? an ionic compound because it has a low boiling point a covalent compound because it has a low boiling point an ionic compound because it has a low melting point a covalent compound because it has a low melting point

a covalent compound because it has a low melting point

Which type of bond will form between two chlorine atoms? an ionic bond a metallic bond a polar covalent bond a nonpolar covalent bond

a nonpolar covalent bond

How many valence electrons are available for bonding in silicon? four five eight fourteen

four

How many valence electrons are available for bonding in bromine (Br)? one two five seven

seven