Question

1. Chapter 12 Question 1 - True/False

Part A

Intermolecular forces are the attractive forces between atoms within a compound.

Intermolecular forces are the attractive forces between atoms within a compound.

True

False

2. Chapter 12 Question 3 - Multiple Choice

Part A

Which state of matter has a high density and a definite volume?

Which state of matter has a high density and a definite volume?

a. solids

b. gases

c. liquids

d. both solids and liquids

e. none of the above

3. Chapter 12 Question 6 - Multiple Choice

Part A

Which statement about surface tension is FALSE?

a. Increased intermolecular forces increase surface tension.

b. Molecules on the surface of the liquid have fewer molecules to interact with.

c. Items with densities lower than water will sink due to surface tension.

d. Liquids tend to minimize their surface area.

e. All of the above statements are true.

4.  

Chapter 12 Question 1 - Algorithmic

Part A

How many kJ of heat are needed to completely vaporize 1.70 moles of H₂O? The heat of vaporization for water at the boiling point is 40.6 kJ/mole.

How many kJ of heat are needed to completely vaporize 1.70 moles of H₂O? The heat of vaporization for water at the boiling point is 40.6 kJ/mole.

a. 23.9

b. 2.26

c. 69.0

d. 30.6

e. none of the above

Answer 1

part A

Answer is TRUE

The stronger the intermolecular forces of attraction between atoms within a compound, more energy is required to break those forces.the different properties like physical state,boiling point, melting point etc of a compound depend on the type and strength of intermolecular forces present in a compound.

part B

answer is D

Solids and liquid both have have density in comparison to gas and both have a definite volume.

part C

Answer is C

Because for an item to sink in water the density of the item is more than that of water. therefore statement C is false.

part D

answer is C

For calculating heat in kj the formula we used is

Energy required = Mass in moles* Heat of vapourization in Kj/mol

=1.70*40.6

=69.02 Kj heat is required for complete vapourization of H2O.