Mod03-Practice-Key(1) (1)

Module 3 Practice Questions 1. Energy and Light a. What is the frequency of light with a wavelength of 105 um: c = λν ⇒ ν = c λ ν = 2.997924 × 10 8 m s ( 105 um ) ( 1 m 1 × 10 6 um ) = 2.86 × 10 12 s − 1 b. What is the wavelength of light (in meters) with a frequency of 1.88 x 10 5 Hz? c = λν ⇒ λ = c ν λ = 2.997924 × 10 8 m s 1.88 × 10 5 s − 1 = 1590 m c. What is the energy of single photon (in joules) with a wavelength of 505 pm? ν = 2.997924 × 10 8 m s ( 505 pm ) ( 1 m 1 × 10 12 pm ) = 5.93648 × 10 17 s − 1 E = hν = ( 6.62607 × 10 − 34 J ∙s ) ( 5.93648 × 10 17 s − 1 ) = 3.93 × 10 − 16 J 2. Orbitals Identify the following orbitals as s , p , d or f . f p d d s 3. Electron configurations a. Write both the full and noble-gas electron configurations of the following elements (using aufbau rules) i. boron 1 s 2 2 s 2 2 p 1 . [He] 2 s 2 2 p 1 ii. sodium 1 s 2 2 s 2 2 p 6 3 s 1 . [Ne] 3 s 1 iii. iron 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 6 . [Ar] 4 s 2 3 d 6 iv. phosphorus 1 s 2 2 s 2 2 p 6 3 s 2 3 p 3 . [Ne] 3 s 2 3 p 3 v. krypton 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 . [Ar] 4 s 2 3 d 10 4 p 6 vi. technetium 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 5 s 2 4 d 5 . [Kr] 5 s 2 4 d 5 vii. zinc 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 . [Ar] 4 s 2 3 d 10