Q: Which equation would you use to calculate the density of a metallic solid with a face-centered cubic unit cell, given the edge length $$a$$ and molar mass $$M$$?

$$\text{Density} = \frac{4M}{N_A a^3$}$$

Question 1

Which intermolecular force is primarily responsible for the high boiling point of water compared to other similar-sized molecules?

Accepted Answer

Hydrogen bonding

Question 2

A sample of ethanol is heated from 20°C to 80°C. Which property is most directly affected by the increase in temperature?

Accepted Answer

Viscosity decreases

Question 3

Which of the following best describes the difference between a body-centered cubic (BCC) and a face-centered cubic (FCC) unit cell?

Accepted Answer

BCC has atoms at the corners and center; FCC has atoms at the corners and faces.

Question 4

Which equation would you use to calculate the density of a metallic solid with a face-centered cubic unit cell, given the edge length $$a$$ and molar mass $$M$$?

Accepted Answer

$$	ext{Density} = \frac{4M}{N_A a^3$}$$

Question 5

A liquid rises in a narrow glass tube. Which property is responsible for this capillary action?

Accepted Answer

Strong adhesive forces between liquid and glass

Question 6

Which phase change is endothermic and involves the greatest increase in entropy?

Accepted Answer

Sublimation

Question 7

A heating curve for water shows a plateau at 100°C. What does this plateau represent?

Accepted Answer

The temperature at which water boils

Question 8

Which property is NOT characteristic of metallic solids?

Accepted Answer

Low melting point

Question 9

Which intermolecular force is present in all molecular solids, regardless of their polarity?

Accepted Answer

Dispersion forces

Question 10

A semiconductor is doped with an element that has more valence electrons than the host. What type of semiconductor is formed?

Accepted Answer

n-type

Question 11

Which of the following best explains why ionic solids are brittle?

Accepted Answer

Shifting layers causes like charges to align and repel

Question 12

Which equation would you use to calculate the energy required to vaporize $$m$$ grams of a liquid with molar mass $$M$$ and enthalpy of vaporization $$\Delta H_{vap}$$?

Accepted Answer

$$q = \frac{m}{M} \Delta H_{vap}$$

Question 13

Which property distinguishes covalent-network solids from molecular solids?

Accepted Answer

Covalent-network solids have high melting points due to extensive bonding

Question 14

Which of the following is a real-world example of a covalent-network solid?

Accepted Answer

Diamond (carbon)

Question 15

A phase diagram shows a triple point. What does the triple point represent?

Accepted Answer

The temperature and pressure where solid, liquid, and gas coexist

Question 16

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are composed of repeating units called monomers

Question 17

Which property is most likely to increase when a metal is alloyed with a smaller atom?

Accepted Answer

Hardness

Question 18

Which of the following best describes the band theory of metals?

Accepted Answer

Electrons are shared in a sea, allowing conductivity

Question 19

Which equation would you use to calculate the vapor pressure of a liquid at a given temperature using the Clausius-Clapeyron equation?

Accepted Answer

$$\ln\left(\frac{P_2$}{P_1$}\right) = -\frac{\Delta H_{vap}}{R}\left(\frac{1}{T_2$} - \frac{1}{T_1$}\right)$$

Question 20

A solid has a coordination number of 8 and is composed of ions. Which type of unit cell is most likely present?

Accepted Answer

Body-centered cubic

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