Q: Which of the following statements correctly describes the relationship between the wavelength ($$\lambda$$), frequency ($$\nu$$), and energy ($$E) of $$electromagnetic radiation?

$$E is $$directly proportional to $$\nu$$ and inversely proportional to $$\lambda.$$

Question 1

Which of the following statements correctly describes the relationship between the wavelength ($$\lambda$$), frequency ($$
u$$), and energy ($$E) of $$electromagnetic radiation?

Accepted Answer

$$E is $$directly proportional to $$
u$$ and inversely proportional to $$\lambda.$$

Question 2

A photon of light has a wavelength of $$4.00 	imes 10$$^{-7}$$ m. What is its frequency ($$
u$$)? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$7.50 	imes 10$$^{14}$$ Hz

Question 3

According to the Bohr model, which transition in a hydrogen atom would emit the photon with the shortest wavelength?

Accepted Answer

From $$n=2 to$$ $$n=1$$

Question 4

Which of the following electron configurations represents a violation of the Pauli Exclusion Principle?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{11}$$

Question 5

Which element has the greatest ionization energy?

Accepted Answer

Fluorine ($$F)$$

Question 6

Which of the following statements about atomic size is correct?

Accepted Answer

Atomic size increases from top to bottom within a group.

Question 7

Which of the following molecules is nonpolar, even though it contains polar bonds?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 8

Which of the following best describes the geometry and bond angle of methane ($$CH_4) $$according to VSEPR theory?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 9

Which of the following Lewis structures violates the octet rule?

Accepted Answer

Boron trifluoride ($$BF_3)$$

Question 10

Which of the following pairs of atoms would form a bond with the greatest polarity?

Accepted Answer

Na and F

Question 11

A sample of gas occupies $$2.00 L at$$ $$1.00$$ atm and $$300 K. $$What will be its volume at $$2.00$$ atm and $$300 K$$? (Assume ideal gas behavior.)

Accepted Answer

$$1.00 L$$

Question 12

Which of the following statements is NOT a postulate of the kinetic molecular theory of gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 13

A mixture of $$O_2$$ and $$N_2$$ gases exerts a total pressure of $$800$$ torr. If the partial pressure of $$O_2 is$$ $$300$$ torr, what is the partial pressure of $$N_2$$?

Accepted Answer

$$500$$ torr

Question 14

Which of the following correctly expresses the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 15

A $$5.00 g $$sample of $$O_2$$ gas is collected at $$1.00$$ atm and $$273 K. $$What is the volume of the gas at STP? (Molar mass of $$O_2 = 32.0$ g/mol, 1$ mol gas at STP = 22.4$ L)

Accepted Answer

$$1.40 L$$

Question 16

Which of the following is the correct electron configuration for a ground-state phosphorus atom ($$Z=15$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 17

Which of the following best explains why metals tend to have high electrical conductivity?

Accepted Answer

Metals have loosely held valence electrons that can move freely.

Question 18

Which of the following molecules exhibits resonance?

Accepted Answer

Ozone ($$O_3)$$

Question 19

A $$2.00 L $$container holds $$0.10$$ mol of $$He$$ gas at $$300 K. $$What is the pressure inside the container? ($$R = 0.0821 L$$·atm/mol·K)

Accepted Answer

$$0.41$$ atm

Question 20

Which of the following best describes the difference between a covalent and an ionic bond?

Accepted Answer

Covalent bonds involve sharing of electrons; ionic bonds involve transfer.

Electrons in Atoms, Chemical Bonding, and Gases: Study Guide

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