HC Unit 10 (Ch 14) Test

Second-row hydrides (HF, H₂O, NH₃) generally have higher than expected boiling points for their position on the periodic table.

(a)  

• True
• False

The bonding forces that hold the atoms of a molecule together are called intermolecular forces, whereas the forces that occur among molecules that cause them to aggregate to form a solid or a liquid are called intramolecular forces.

(a)  

• True

• False

The molar heats of fusion of water and iodine are 6.02 kJ/mol and 16.7 kJ/mol, respectively. It will take more energy to melt a gram of ice than to melt a gram of solid iodine.

(a)  

• True
• False

An alloy has metallic properties.

(a)  

• True
• False

Starting with the same amount of liquid HF and liquid HCl, if we heat these samples at the same rate, HF would boil first.

(a)  

• True

• False

In general, the density of a compound as a gas is closer in value to that of the compound as a liquid than the density of the compound as a liquid is closer in value to that of the compound as a solid.

(a)  

• True

• False

At 1 atmosphere of pressure, liquid water always changes to gaseous water at 100°C.

(a)  

• True
• False

The bonds between hydrogen and oxygen in a water molecule can be characterized as (a)   .

• hydrogen bonds

• intramolecular forces
• dispersion forces

• intermolecular forces

• London forces

Consider the following compounds: ICl₃, SeCl₆, NF₃, CO₃²⁻.

How many of these compounds exhibit London dispersion forces?

(a)  

• 0

• 1

• 2

• 3

• 4

Name the type of crystalline solid formed by potassium bromide.

(a)  

• amorphous solid

• molecular solid

• atomic solid

• ionic solid
• None of the above