Question 1

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

SO3

Question 2

According to VSEPR theory, what is the molecular geometry of SO2?

Accepted Answer

Bent

Question 3

Which species violates the octet rule?

Accepted Answer

BF3

Question 4

In the Lewis structure for $$\mathrm{NH_4$^+}$$, what is the formal charge on nitrogen?

Accepted Answer

$$0$$

Question 5

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

5 $$\sigma$$, 1 $$\pi$$

Question 6

Which statement about $$\sigma$$ and $$\pi$$ bonds is correct?

Accepted Answer

$$\sigma$$ bonds form from head-to-head overlap

Question 7

Which molecule is paramagnetic?

Accepted Answer

O2

Question 8

According to molecular orbital (MO) theory, what is the bond order of $$\mathrm{O_2$}$$?

Accepted Answer

2

Question 9

Which type of intermolecular force is strongest in HF?

Accepted Answer

Hydrogen bonding

Question 10

Which compound has the highest boiling point?

Accepted Answer

NH3

Question 11

Which force exists in all substances, regardless of polarity?

Accepted Answer

London dispersion

Question 12

The high surface tension of water is primarily due to:

Accepted Answer

Hydrogen bonding

Question 13

On a phase diagram, the boundary between liquid and gas represents:

Accepted Answer

Vaporization

Question 14

Which property is colligative?

Accepted Answer

Boiling point elevation

Question 15

At $$40^\circC$$, the solubility of KNO$$_3 is 64 g $$per 100 g of water. If 80 g KNO$$_3 is $$added to 100 g water at $$40^\circC$$, the solution is:

Accepted Answer

Supersaturated

Question 16

What is the freezing point of a 1.0 m NaCl solution in water? ($$K_f = 1.86\ ^\circ\mathrm{C}/\mathrm{m}$$, assume complete dissociation)

Accepted Answer

$$-3.72\ ^\circ\mathrm{C}$$

Question 17

Which molecule experiences only London dispersion forces?

Accepted Answer

CO2

Question 18

Which statement is true about colloids?

Accepted Answer

They scatter light (Tyndall effect)

Question 19

In CO$$_2$$'s phase diagram, increasing pressure at constant temperature can cause:

Accepted Answer

Condensation

Question 20

Which of the following will have the shortest bond length?

Accepted Answer

O$$_2$$^{2+}$$

General Chemistry: Molecular Structure, Bonding, Intermolecular Forces, and Solutions

Guida di studio - Domande di pratica

Study guide - Flashcard