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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: Calculate the wavelength of each of the following frequencies of electromagnetic radiation. a. 101.9 MHZ (typical frequency for FM radio broadcasting) Delta1 = m? b. 1020 KHZ (typical frequency for AM radio broadcasting) (assume four significant figures) Delta =

m?

c. 835.6 MHZ (common frequency used for cell phone communication) Express your answer using four significant figures. Delta3 =

m?

PRACTICE: Which electronic transition in atomic hydrogen corresponds to the emission of visible light? a) n = 5 → n = 2 b) n = 1 → n = 2 c) n = 3 → n = 4 d) n = 3 → n = 1

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: How many orbitals are contained in the third principal level (n=3) of a given atom? A) 7 B) 5 C) 9 D) 3 E) 18

PRACTICE: What label is given to a subshell or orbital with the quantum numbers n = 5 and l = 3? a. 5s b. 5p c. 5d d. 5f e. 5g PRACTICE: Which set of three quantum numbers does not specify an orbital in the hydrogen atom? Provide step by step explanation. a. n = 2; l = 1; m l = -1 b. n = 3; l = 2; m l = 2 c. n = 2; l = 0; m l = 0 d. n = 3; l = 4; m l = 0

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: What are the four quantum numbers for each of the two electrons in a 4s orbital? For first electron: i) n=4, l=0, ml=0, ms=+1/2 ii) n=3, l=1, ml=0, ms=+1/2 iii) n=1, l=0, ml=0, ms=+1/2 iv) n=4, l=3, ml=3, ms=+1/2

PRACTICE: Identify which sets of quantum numbers are valid for an electron. Each set is ordered(n,l,ml,ms). Select all that apply. 3,0, 0,1/2 0,2,1,-1/2 3,2,2,1/2 2,1,0,1/2 4,3,5,-1/2 3,1,-1,1/2 2,2,-1,1/2 4,3,1,-1/2 2,2,1,-1/2 1,-1,-1,-1/2 3,3,1,1/2 3,-2,-1,0

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: What is the maximum number of electrons in an atom that can have the following quantum numbers? Express your answer as an integer. part A. n = 3, ml = -2 part B. n = 4, l = 3 part C. n = 5, l = 3, ml = 2 Part D. n = 4, l = 1, ml = 0

PRACTICE: Which one of the following types of radiation has the shortest wavelength, the greatest energy AND the highest frequency? A. ultraviolet radiation B. infrared radiation C. visible red light D. visible blue light E. none because short wavelength is associated with low energy and low frequency, not high energy and high frequency

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: Determine which of the following statements are false and correct them. (a) The frequency of radiation increases as the wavelength increases.

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: Which statement related to particle and wave properties of matter is correct? a. Particles exhibit diffraction while waves do not. b. A wave travels straight through a slit. c. Interference patterns are observed when a wave passes through a barrier with two slits. d. Particles interfere constructively and destructively whereas waves do not.

PRACTICE: Where h = 6.626 x 10 -34 J s ( Planck's constant ) and c = 2.99 x 10 8 m/s. What is the wavelength of a photon that has an energy of E = 4.13 x 10-19 J? (in meters). The equation for photon energy E is?

PRACTICE: The optic nerve needs a minimum of 2.0 x 10−17 J of energy to trigger a series of impulses that eventually reach the brain. How many photons of blue light (475 nm) are needed?

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: The first ionization energy of carbon is 1.81 aJ. Assuming an ionization efficiency of 22.35%, how many photons of the lowest possible frequency are required to ionize a sample of carbon that contains 5.32 x 1018 atoms? a) 2.38 x 1019 photons b) 4.20 x 10-20 photons c) 2.73 x 1015 photons d) 9.11 x 106 photons

PRACTICE: The mass of an electron is 9.11x10 -31 kg . If the de Broglie wavelength for an electron in a hydrogen atom is 3.31x10-10 m , how fast is the electron moving relative to the speed of light? The speed of light is 3.00 x 108 m/s . Express your answer numerically as a percentage of the speed of light.

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: An electron has an uncertainty in its position of 552 pm. What is the uncertainty in its velocity?

PRACTICE: Consider the process of 2 H(g) → H2( g) where ΔH = −436 kJ/mol Determine if the sentence below is true or false. Shining light on hydrogen atoms could put electrons in n = 3, provided the intensity was sufficiently high.

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: Solving the Rydberg equation for energy change gives ΔE = R∞hc [1/n12 - 1/n22] where the Rydberg constant R∞ for hydrogen-like atoms is 1.097 x 107 m -1 Z2, and Z is the atomic number. (a) Calculate the energies needed to remove an electron from the n = 2 state and the n = 6 state in the Li2+ ion. n = 2 ____ x 10___ J

n = 6 ____ x 10___ J

(Enter your answer in scientific notation.) (b) What is the wavelength (in nm) of the emitted photon in a transition from n = 6 to n = 2? _____ nm

PRACTICE: How many nodal planes are present in a 3f orbital? 1. 5 2. 4 3. 7 4. 2 5. 3

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TORONTO - INTRODUCTORY CHEMISTRY I: STRUCTURE AND BONDIN IULIIS CHAPTER 7 ASSIGNMENT PRACTICE: Which of the following quantum numbers describes the shape of an orbital? a. principal quantum number b. Schrodinger quantum number c. spin quantum number d. angular momentum quantum number e. magnetic quantum number

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