Q: Calculate the volume in cm\^3 of a simple cubic unit cell if it is composed of atoms with radius 2.5 \AA.

$$(2 \times 2.5 \text{ \AA})^3$ = 125 \text{ \AA}^3 = 1.25 \times 10$$^{-22}$$ \text{ cm}^3$$

Question 1

Which of the following molecules is polar due to its molecular geometry, even though all the bonds are polar?

Accepted Answer

NH\_3

Question 2

Which intermolecular force is present in ALL substances, regardless of their polarity?

Accepted Answer

London dispersion forces

Question 3

A sample of water is heated from 0 \degree C to 100 \degree C. Which formula would you use to calculate the energy required to raise the temperature of the liquid water?

Accepted Answer

$$q = m c \Delta T$$

Question 4

Which of the following compounds would be expected to have the highest boiling point?

Accepted Answer

CH\_3OH

Question 5

Which type of crystalline solid is diamond (C) classified as?

Accepted Answer

Covalent network

Question 6

What is the major intermolecular force between particles of CH\_3OH?

Accepted Answer

Hydrogen bonding

Question 7

Which of the following statements about phase diagrams is correct?

Accepted Answer

The critical point is the temperature and pressure above which the liquid and gas phases are indistinguishable.

Question 8

A substance has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 81.1 \degree C. At what temperature does its vapor pressure reach 400 mmHg?

Accepted Answer

73.7 \degree C

Question 9

Which of the following best describes the process occurring when a solid changes directly to a gas?

Accepted Answer

Sublimation

Question 10

Which of the following molecules would be expected to have the highest surface tension at a given temperature?

Accepted Answer

CH\_3OH

Question 11

Which of the following is the correct linear form of the Clausius-Clapeyron equation?

Accepted Answer

$$\ln P = -\frac{\Delta H_{vap}}{R} \cdot \frac{1}{T} + C$$

Question 12

Which of the following solids is classified as amorphous?

Accepted Answer

Glass

Question 13

What is the coordination number of a simple cubic unit cell?

Accepted Answer

6

Question 14

Which of the following best explains why water has a higher boiling point than methane?

Accepted Answer

Water has hydrogen bonding, which is stronger than the forces in methane.

Question 15

Calculate the volume in cm\^3 of a simple cubic unit cell if it is composed of atoms with radius 2.5 \AA.

Accepted Answer

$$(2 	imes 2.5 	ext{ \AA})^3$ = 125 	ext{ \AA}^3 = 1.25 	imes 10$$^{-22}$$ 	ext{ cm}^3$$

Question 16

Which of the following substances is expected to have the largest dispersion forces?

Accepted Answer

CCl\_4

Question 17

Which of the following is true about the relationship between intermolecular forces and vapor pressure?

Accepted Answer

Stronger intermolecular forces result in lower vapor pressure.

Question 18

Which of the following is the most basic repeating structure of a crystal lattice?

Accepted Answer

Unit cell

Question 19

A body-centered cubic unit cell contains how many atoms per unit cell?

Accepted Answer

2

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