Dimensional Analysis/Dilution
Give the name of the prefix and the quantity indicated by the following symbols that are used with SI base units.
c, d, k, m, n, p,
centi, deci, kilo, mili, nano, pico,
FM-95, an FM radio station, broadcasts at a frequency of 9.51 ×10^7 s−1 (95.1 MHz). What is the wavelength of these radio waves in meters?
3.15 m
Using the Bohr model, determine the energy of an electron with n = 6 in a hydrogen atom.
6.05x10^-20 J
Using complete subshell notation and abbreviated notation , predict the electron configuration of Cd
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰
[Kr] 5s² 4d¹⁰
How many valence electrons does phosphorus (P) atom have?
5
Soccer is played with a round ball having a circumference between 27 and 28 in. and a weight between 14 and 16 oz. What are these specifications in units of centimeters and grams?
(1inch= 2.54cm, 1oz, = 28.35 g)
68–71 cm; 400–450 g
A solution appears yellow to the eye, what color light would you expect to be absorbed?
violet light
Which transition in a hydrogen atom would result in absorption of a photon with the shortest wavelength, n=1 to n=6, n=5 to n=6, or n=2 to n=1
n=1 to n=6
Which atom has the electron configuration
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7
Co
Based on the periodic table which atom has the highest ionization energy?
F, Rb, Ne, Mg, C
Ne
What is the mass of the solute in 0.500 L of 0.30 M glucose, C6H12O6, used for intravenous injection?
27g
A photon of light produced by a surgical laser has an energy of 3.027 ×
10−19 J. Calculate the frequency and wavelength of the photon. What is the color of the emitted light?
ν = 4.568 ×1014 s−1
λ = 656.3 nm
red
The electron volt (eV) is a convenient unit of energy for expressing atomic-scale energies. It is the amount of energy that an electron gains when subjected to a potential of 1 volt; 1 eV = 1.602 ×10^–19 J. Using the Bohr model, determine the energy, in electron volts, of the photon produced when an electron in a hydrogen atom moves from the orbit with n = 3 to the orbit with n = 2.
1.72 eV
Which ion with a +2 charge has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶? Which ion with a -1 charge has this configuration?
+2 ion: Ca²⁺
-1 ion: Cl⁻
List the following ions in order of increasing radius: Mg2+, Br–, Li+, Te2–.
Mg2+ < Li+ < Br– < Te2–.
If 0.1718 L of a 0.3556-M C3H7OH solution is diluted to a concentration of 0.1222 M, what is the volume of the resulting solution?
0.5 L
RGB color television and computer displays use cathode ray tubes that produce colors by mixing red, green, and blue light. If we look at the screen with a magnifying glass, we can see individual dots turn on and off as the colors change. Using a spectrum of visible light, determine the approximate wavelength of each of these colors. What is the frequency and energy of a photon of each of these colors?
Red: 660 nm; 4.54 × 10^14 Hz; 3.01 × 10^−19 J. Green: 520 nm; 5.77 × 10^14 Hz; 3.82 × 10^−19 J. Blue: 440 nm; 6.81 × 10^14 Hz; 4.51 × 10^−19 J.
Consider a large number of hydrogen atoms with electrons randomly distributed in the n = 1, 2, 3, and 4 orbits.
Calculate the lowest and highest energies of light produced by the transitions.
Lowest: 1.06x10^-19 J
Highest: 2.04x10^-18 J
Draw the orbital diagram for the valence shell of Fe, it can be abbreviated
Photo answer
What atom between Si and Na has a higher electronegativity and smaller radius, make sure to include the effects of Zeff.
Si
2.5x10^11 molecules of the toxin
You measure the absorbance of a sports drink containing a dye and obtain a value of 0.158. What is the concentration of the dye in the soft drink in units of um. The line of best fit is: y= 41857x + 0.0114.
3.50 um
Which spectrum is most likely the result of the 3 electronic transitions shown on the right? Longer wavelengths are on the right side of each spectrum. The upper arrow produces a photon of wavelength λ. The lower energy gap is twice the size of the upper gap.
Photo answer
Cobalt–60 and iodine–131 are radioactive isotopes commonly used in nuclear medicine. How many protons, neutrons, and electrons are in atoms of these isotopes? Write the complete electron configuration for each isotope.
Co has 27 protons, 27 electrons, and 33 neutrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷.
I has 53 protons, 53 electrons, and 78 neutrons:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵.
Write a sentence describing how Zeff relates to electronegativity.
A higher effective nuclear charge exerts a stronger attractive pull on outer electrons. This stronger positive pull makes it easier for the atom to attract bonding electrons from other atoms.