CHEMISTRY-TEXT
8th Edition
ISBN: 9780134856230
Author: Robinson
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 5.19P
What percentage of electrical energy is converted to light energy in
(a) an incandescent bulb?
(b) a fluorescent bulb?
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Students have asked these similar questions
The distance to the North Star, Polaris, is approximately 6.44 × 1018 m. (a) If Polaris were to burn out today, how many years from now would we see it disappear? (b) What time interval is required for sunlight to reach the Earth?(c) What time interval is required for a microwave signal to travel from the Earth to the Moon and back?
"Photosynthesis is a process in which light energy is captured and stored by an organism, and
the stored energy is used to drive cellular processes," (Blankenship, p. 1). Photosynthesis
doesn't just happen in green plants; it can occur in bacteria, as well. It occurs when light-
harvesting molecules absorb energy in the form of light and transfer it to a reaction center,
where light energy is converted to chemical energy. Most of us know about chlorophyll as the
light-harvesting molecule, but there are many forms of chlorophyll found in different
organisms. However, they all have similar properties when interacting with light.
PHOTOSYNTHETIC PIGMENTS
1.6
C
0.7
1.4
0.6
1.2-
Soret
0.5
A
0.4
0.8
H
COOCH,
phytyl bacteriochlorophyll a
0.3
0.6
0.2
0.4
0.1
0.2
01
700 750 800 850 900
300
400
500
600
700
800
2 (nm)
2 (nm)
Figure 4.7 Absorption (left) and fluorescence (right) spectra of bacteriochlorophyll a in diethyl ether.
5. Look at this figure from Blankenship's book, Molecular Mechanisms…
Question 17.a of 18
The work function (binding energy) is the energy that must be supplied
to cause the release of an electron from a photoelectric material. The
corresponding photon frequency is the threshold frequency. The
higher the energy of the incident light, the more kinetic energy the
electrons have in moving away from the surface. The work function for
cesium (used in IR lamps) is equivalent to 202.6 kJ/mol photons. Use
this information to calculate the energy, wavelength, and velocity of
ejected electrons.
What is the maximum wavelength (in nm) at which the electron can be
removed from cesium? h = 6.626 x 10-34 J·s; c = 2.998 × 108 m/s8
Chapter 5 Solutions
CHEMISTRY-TEXT
Ch. 5 - What is the wavelength in meters of an FM radio...Ch. 5 - Conceptual APPLY 5.2 Two electromagnetic waves are...Ch. 5 - PRACTICE 5.3 The biological effects of a given...Ch. 5 - Prob. 5.4ACh. 5 - Prob. 5.5PCh. 5 - Conceptual APPLY 5.6 Compare the two elements Rb...Ch. 5 - PRACTICE 5.7 The Balmer equation can be extended...Ch. 5 - APPLY 5.8 (a) What is the longest-wavelength line...Ch. 5 - Prob. 5.9PCh. 5 - Prob. 5.10A
Ch. 5 - Give the or bital notation for an electron in an...Ch. 5 - APPLY 5.10 Extend Table 5.2 to show allowed...Ch. 5 - Conceptual PRACTICE 5.13 Give a possible...Ch. 5 - Conceptual APPLY 5.14 How many nodal planes...Ch. 5 - Give the expected ground state electron...Ch. 5 - Conceptual APPLY 5.16 Identify the atoms with the...Ch. 5 - Order the atoms from smallest to largest: Cs,...Ch. 5 - APPLY 5.18 Predict which bond length will be the...Ch. 5 - What percentage of electrical energy is converted...Ch. 5 - Prob. 5.20PCh. 5 - (a) How is the emission spectrum from the...Ch. 5 - PROBLEM 5.19 Mercury vapor is contained inside the...Ch. 5 - PROBLEM 5.20 When electricity is used to add...Ch. 5 - Atomic emission spectra arise from electron...Ch. 5 - PROBLEM 5.22 Three different wavelengths in the...Ch. 5 - Two electromagnetic waves are represented below....Ch. 5 - The following diagram shows the energy levels of...Ch. 5 - Identify each of the following orbitals, and give...Ch. 5 - Where on the blank outline of the periodic table...Ch. 5 - One of the elements shown on the following...Ch. 5 - What atom has the following orbital-filling...Ch. 5 - The following orbital-filling diagram represents...Ch. 5 - Prob. 5.33CPCh. 5 - Which has the higher frequency, red light or...Ch. 5 - Prob. 5.35SPCh. 5 - The Hubble Space Telescope detects electromagnetic...Ch. 5 - Prob. 5.37SPCh. 5 - What is the wavelength in meters of ultraviolet...Ch. 5 - What is the frequency of a microwave with...Ch. 5 - A certain cellular telephone transmits at a...Ch. 5 - Optical fibers allow the fast transmission of vast...Ch. 5 - Calculate the energies of the following waves in...Ch. 5 - The magnetic resonance imaging (MRI) body scanners...Ch. 5 - What is the wavelength in meters of photons with...Ch. 5 - What is the energy of each of the following...Ch. 5 - You’re probably familiar with using Scotch rape...Ch. 5 - Hard wintergreen-flavored candies are...Ch. 5 - Prob. 5.48SPCh. 5 - Photochromic sunglasses, which darken when exposed...Ch. 5 - Prob. 5.50SPCh. 5 - Prob. 5.51SPCh. 5 - The work function of cesium metal is 188 kJ/mol,...Ch. 5 - Prob. 5.53SPCh. 5 - The work function of silver metal is 436 kJ/mol....Ch. 5 - Cesium metal is frequently used in photoelectric...Ch. 5 - Spectroscopy is a technique that uses the...Ch. 5 - Prob. 5.57SPCh. 5 - According to the equation for the Balmer line...Ch. 5 - According to the equation for the Balmer line...Ch. 5 - Calculate the wavelength and energy in kilojoules...Ch. 5 - Calculate the wavelength and energy in kilojoules...Ch. 5 - One series of lines of the hydrogen spectrum is...Ch. 5 - One series of lines of the hydrogen spectrum is...Ch. 5 - Use the Balmer equation to calculate the...Ch. 5 - Prob. 5.65SPCh. 5 - Protons and electrons can be given very high...Ch. 5 - What is the wavelength in meters of a proton...Ch. 5 - What is the de Broglie wavelength in meters of a...Ch. 5 - What is the de Brogue wavelength in meters of a...Ch. 5 - At what speed in meters per second must a 145 g...Ch. 5 - What velocity would an electron (mass=9.111031kg)...Ch. 5 - Use the Heisenberg uncertainty principle to...Ch. 5 - The mass of a helium atom is 40026 amu, and its...Ch. 5 - What is the Heisenberg uncertainty principle, and...Ch. 5 - Why do we have to use an arbitrary value such as...Ch. 5 - What are the four quantum numbers, and what does...Ch. 5 - Tell which of the following combinations of...Ch. 5 - Give the allowable combinations of quantum numbers...Ch. 5 - Give the orbital designations of electrons with...Ch. 5 - Which of the following combinations of quantum...Ch. 5 - Which of the following combinations of quantum...Ch. 5 - What is the maximum number of electrons in an atom...Ch. 5 - What is the maximum number of electrons in an atom...Ch. 5 - Sodium atoms emit light with a wavelength of 330...Ch. 5 - Prob. 5.85SPCh. 5 - Prob. 5.86SPCh. 5 - Assign a set of four quantum numbers to each...Ch. 5 - Assign a set of four quantum numbers for the outer...Ch. 5 - Which of the following is a valid set of four...Ch. 5 - Prob. 5.90SPCh. 5 - Prob. 5.91SPCh. 5 - Prob. 5.92SPCh. 5 - Prob. 5.93SPCh. 5 - Prob. 5.94SPCh. 5 - Prob. 5.95SPCh. 5 - Order the electrons in the following orbitals...Ch. 5 - Order the following elements according to...Ch. 5 - Prob. 5.98SPCh. 5 - Prob. 5.99SPCh. 5 - Which orbital in each of the following pairs is...Ch. 5 - Order the orbitals for a multi electron atom in...Ch. 5 - According to the aufbau principle, which orbital...Ch. 5 - According to the autbau principle, which orbital...Ch. 5 - Give the expected ground-state electron...Ch. 5 - Give the expected ground-state electron...Ch. 5 - Draw orbital-filling diagrams for the following...Ch. 5 - Draw orbital-filling diagrams for atoms with the...Ch. 5 - How many unpaired electrons are present in each of...Ch. 5 - Identify the following atoms. (a) It has the...Ch. 5 - Prob. 5.110SPCh. 5 - Given the sub shells 1s, 2s, 2p, 3s, 3p and 3d,...Ch. 5 - Prob. 5.112SPCh. 5 - Prob. 5.113SPCh. 5 - Take a guess. What do you think is a likely...Ch. 5 - Take a guess. What is a likely ground-state...Ch. 5 - Prob. 5.116SPCh. 5 - Prob. 5.117SPCh. 5 - Prob. 5.118SPCh. 5 - Prob. 5.119SPCh. 5 - Prob. 5.120SPCh. 5 - Prob. 5.121SPCh. 5 - Prob. 5.122SPCh. 5 - Which atom in each of the following pairs has a...Ch. 5 - Orbital energies in single-electron atoms or ions,...Ch. 5 - Like He+ , the Li2+ ion is a single-electron...Ch. 5 - Prob. 5.126MPCh. 5 - Draw orbital-filling diagrams for the following...Ch. 5 - The atomic radii of Y (180 pm) and Li (187 pm) are...Ch. 5 - Prob. 5.129MPCh. 5 - Prob. 5.130MPCh. 5 - Prob. 5.131MPCh. 5 - The amount of energy necessary to remove an...Ch. 5 - Prob. 5.133MPCh. 5 - Prob. 5.134MPCh. 5 - Prob. 5.135MPCh. 5 - A minimum energy of 7.211019J is required to...Ch. 5 - Prob. 5.137MPCh. 5 - An energetically excited hydrogen atom has its...Ch. 5 - Prob. 5.139MP
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