Question 1

Which of the following best describes the wave nature of light?

Accepted Answer

Light exhibits properties of both waves and particles, such as interference and diffraction.

Question 2

Given the speed of light $$c = 3.00 	imes 10^8$ m/s, what is the frequency of light with a wavelength of 6.00$$ 	imes $$10^{-7} m$$?

Accepted Answer

$$5.00 	imes 10$$^{14}$$ Hz

Question 3

Which experiment led to the development of the Bohr model by demonstrating that electrons occupy discrete energy levels?

Accepted Answer

The hydrogen emission spectrum experiment

Question 4

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 5

Which of the following best represents the shape of a $$p$$ orbital?

Accepted Answer

Dumbbell-shaped

Question 6

What is the correct noble gas electron configuration for $$	ext{Ca}^{2+}$$?

Accepted Answer

$$[	ext{Ar}]$$

Question 7

Which element has the highest electronegativity?

Accepted Answer

Fluorine

Question 8

Which of the following is the correct Lewis structure for carbon dioxide ($$	ext{CO}_2$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 9

Which of the following molecules exhibits resonance?

Accepted Answer

$$	ext{O}_3$$

Question 10

Predict the molecular shape of ammonia ($$	ext{NH}_3) $$using VSEPR theory.

Accepted Answer

Trigonal pyramidal

Question 11

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

Accepted Answer

$$	ext{CO}_2$$

Question 12

Which of the following statements about ionization energy is correct?

Accepted Answer

Ionization energy increases across a period from left to right.

Question 13

Which of the following ions has the same electron configuration as neon ($$	ext{Ne}$$)?

Accepted Answer

$$	ext{Na}^+$$

Question 14

Which of the following best explains why metals tend to lose electrons in chemical reactions?

Accepted Answer

Metals have low ionization energies and low electronegativities.

Question 15

Which of the following is the correct electron configuration for $$	ext{Fe}^{3+}$$ using the noble gas core abbreviation?

Accepted Answer

$$[	ext{Ar}] 3d^5$

Question 16

Which of the following statements about atomic size is correct?

Accepted Answer

Atomic size decreases across a period from left to right.

Question 17

Which of the following molecules is polar?

Accepted Answer

$$	ext{H}_2	ext{O}$$

Question 18

Which of the following best describes the relationship between the energy ($$E) $$and frequency ($$
u) of a $$photon?

Accepted Answer

$$E = h
u$$

Question 19

Which of the following is a correct resonance structure for the nitrate ion ($$	ext{NO}_3^-$$)?

Accepted Answer

One N–O single bond and two N=O double bonds, with the negative charge delocalized over the three oxygens

Question 20

A molecule has the Lewis structure of $$	ext{CH}_2	ext{O} ($$formaldehyde). What is its molecular geometry?

Accepted Answer

Trigonal planar

Study Guide for Exam 4: Electrons, Atomic Structure, and Chemical Bonding

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