Question 1

Which of the following elements has the highest first ionization energy?

Accepted Answer

Cl

Question 2

A red laser pointer emits light with a wavelength of 650 nm. What is the energy of one photon emitted by this laser?

Accepted Answer

$$3.06 	imes 10$$^{-19}$$ J

Question 3

Which of the following sets of quantum numbers is NOT possible?

Accepted Answer

$$n = 4, \ l = 3, \ m_l = 4, \ m_s = +1/2$$

Question 4

Which of the following molecules/ions would have the smallest bond angle between terminal atoms?

Accepted Answer

SCl$$_2$$

Question 5

Which of the following compounds does NOT follow the octet rule?

Accepted Answer

PF$$_5$$

Question 6

Which of the following molecules has a net dipole moment?

Accepted Answer

NF$$_3$$ only

Question 7

The polyatomic ion NO$$_3^-$$ exhibits resonance. What is the bond order of the nitrogen-oxygen bond in NO$$_3^-$$?

Accepted Answer

1.33

Question 8

Which of the following solids would have the largest (most exothermic) lattice energy?

Accepted Answer

MgCl$$_2$$

Question 9

How many unpaired electrons does the atom of vanadium (V) have?

Accepted Answer

3

Question 10

Which of the following species is paramagnetic according to molecular orbital theory?

Accepted Answer

O$$_2$$

Question 11

Calculate the wavelength of a photon of light emitted when an electron travels from $$n=5 to$$ $$n=2 in a $$hydrogen atom.

Accepted Answer

434 nm

Question 12

Which of the following bonds is the most polar?

Accepted Answer

C–O

Question 13

Which element would have the following ionization energies (kJ/mol)? $$I_1 = 737$, I_2$ = 1450$$, $$I_3 = 7731$, I_4$ = 10554$$, $$I_5 = 13627$, I_6$ = 17995$$, $$I_7 = 21700$

Accepted Answer

Al

Question 14

Which of the following answers lists the ions in order of decreasing radius (largest to smallest)?

Accepted Answer

N$$^{3-}$$ \u003e O$$^{2-}$$ \u003e F$$^-$$ \u003e Na$$^+$$ \u003e Mg$$^{2+}$$

Question 15

Which of the following statements is TRUE regarding electromagnetic radiation?

Accepted Answer

As the wavelength of light increases, the frequency decreases.

Question 16

Which of the following sets of four quantum numbers could designate an electron in a 5p orbital?

Accepted Answer

$$n = 5, \ l = 1, \ m_l = 1, \ m_s = +1/2$$

Question 17

Which of the following molecules/ions has the highest bond order according to molecular orbital theory?

Accepted Answer

C$$_2$$^{2-}$$

Question 18

Which of the following species has the shortest bond length?

Accepted Answer

N$$_2$$

Question 19

Which of the following pairs of elements would have similar chemical properties?

Accepted Answer

I and III

Question 20

A photon with wavelength 122 nm can excite an electron in hydrogen from $$n=1 to$$ $$n=2. $$Which of the following statements are TRUE?

Accepted Answer

None of the above

General Chemistry IA: Atomic Structure, Bonding, and Molecular Properties – Study Guide

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