Q: A photon has a frequency of $$6.0 \times 10$$^{14}$$\ \mathrm{Hz}. $$What is its energy in joules? (Planck's constant $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$3.98 \times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which of the following electromagnetic radiations has the highest energy per photon?

Accepted Answer

Ultraviolet

Question 2

A photon has a frequency of $$6.0 	imes 10$$^{14}$$\ \mathrm{Hz}. $$What is its energy in joules? (Planck's constant $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 3

Which quantum number primarily determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number $$l$$

Question 4

Which of the following electron configurations represents a violation of Hund's rule?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$ with paired electrons in one $$2p$$ orbital and one $$2p$$ orbital empty

Question 5

Which of the following molecules contains the most easily broken carbon–carbon bond?

Accepted Answer

$$\mathrm{C_2H_6}$$

Question 6

Which of the following ions has the largest radius?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 7

Which of the following is the correct net ionic equation for the reaction of $$\mathrm{$$CaCl_2$$}$$ and $$\mathrm{Na_2SO_4} in $$water?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$CaSO_4$$(s)}$$

Question 8

Which of the following best explains why the first ionization energy generally increases across a period?

Accepted Answer

The nuclear charge increases, pulling electrons closer to the nucleus.

Question 9

Which of the following is the ground state electron configuration for $$\mathrm{I}$$?

Accepted Answer

$$[Kr] 5s^2$ 4d$$^{10}$$ 5p^5$

Question 10

Which of the following statements about the photoelectric effect is correct?

Accepted Answer

Electrons are emitted only if the frequency of the incident light is above the threshold frequency.

Question 11

Which of the following best describes the difference between a $$2p_x$$ and a $$2p_z$$ orbital?

Accepted Answer

They have the same energy but are oriented along different axes.

Question 12

Which of the following elements has the highest effective nuclear charge ($$Z_{\mathrm{eff}}) $$for its valence electrons?

Accepted Answer

$$\mathrm{Cl}$$

Question 13

Which of the following is the correct order of increasing atomic radius for the elements Na, Mg, Al, Si?

Accepted Answer

Si \u003c Al \u003c Mg \u003c Na

Question 14

Which of the following is the most acceptable Lewis structure for $$\mathrm{N_2O}$$?

Accepted Answer

:N\equiv N-O:

Question 15

Which of the following is the correct set of quantum numbers for the last electron added to the ground state of phosphorus ($$Z=15$$)?

Accepted Answer

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

Question 16

Which of the following best explains why $$\mathrm{C_2H_2}$$ has a shorter C–C bond than $$\mathrm{C_2H_4}$$?

Accepted Answer

$$\mathrm{C_2H_2}$$ has a triple bond between the carbons, while $$\mathrm{C_2H_4}$$ has a double bond.

Question 17

Which of the following is the correct electron configuration for the ground state of Ge?

Accepted Answer

$$[Ar] 4s^2$ 3d$$^{10}$$ 4p^2$

Question 18

Which of the following best describes the trend in ionization energy as you move down a group in the periodic table?

Accepted Answer

Ionization energy decreases due to increased atomic radius and electron shielding.

Question 19

Which of the following is the correct net ionic equation for the reaction of $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl} in $$water?

Accepted Answer

$$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$$

General Chemistry Practice Exam Study Guide: Atomic Structure, Periodicity, Bonding, and Chemical Reactions

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