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chemistry principles and practice

Questions and Answers of Chemistry Principles And Practice

In each part, a set of quantum numbers is given. If the set is an allowed combination of n, ℓ, mℓ, and ms, give the subshell to which this wave function belongs (1s, 2s, 2p, and so on). If the
(a) How many subshells are present in the n = 3 shell?(b) How many orbitals are in the 4p subshell?(c) What is the maximum value of ℓ that is allowed in the shell with n = 4?(d) What are the
(a) How many subshells are present in the n = 4 shell?(b) How many orbitals are in the 3d subshell?(c) What is the maximum value of ℓ that is allowed in the shell with n = 3?(d) What are the
In each part, a set of quantum numbers is given. If the set is an allowed combination of n, ℓ, mℓ, and ms, give the subshell to which this wave function belongs (1s, 2s, 2p, and so on). If the
Give the values of the n and ℓ quantum numbers for the subshells identified by the following designations. (a) 3d (c) 6s (e) 1s (b) 5p (d) 5f
Give the values of the n and ℓ quantum numbers for the subshells identified by the following designations. (a) 3p (c) 7s (e) 2s (b) 5d (d) 4f 69
Give the notation (1s, 2s, 2p, and so on) for each of the following subshells. If the combination is not allowed, state why. (a) n = 5, l = 1 (c) n = 3, l = 2 (e) n = 7, l = 0 (b) n = 1, l=1 (d) n =
Give the notation (1s, 2s, 2p, and so on) for each of the following subshells. If the combination is not allowed, state why. l=1 (a) n = 6, (c) n = 5, l = 2 (e) n = 2, l = 3 (b) n = 3,l = 0 (d) n =
What is the velocity of an electron that has a de Broglie wavelength of 1.00 nm?
Neutrons (mass = 1.67 × 10-27 kg) with a wavelength of 0.150 nm are needed for a diffraction experiment. What velocity must these neutrons have?
Find the de Broglie wavelength associated with each of the following objects:(a) A 68-kg sprinter traveling at 10.0 m/s(b) A 50.0-g ball traveling at 100 mph (44.7 m/s)(c) An electron (mass = 9.11 ×
Find the de Broglie wavelength that is associated with each of the following objects:(a) A ball with a mass of 0.100 kg traveling at 40.0 m/s(b) A 753-kg car traveling at 24.6 m/s (55 mph)(c) A
Find the wavelength of an electron having n = 2 in Bohr’s model of hydrogen if the velocity of the electron is 1.096 × 106 m/s. The radius of this orbit is 212 pm. Compare the wavelength of the
The velocity of an electron having n = 1 in Bohr’s model is 2.19 × 106 m/s. What is the wavelength of this electron? The radius of its orbit is 52.9 pm. Compare the wavelength of the electron to
What is the wavelength, in nanometers, of a neutron (mass = 1.67 × 10-27 kg) that is moving at a velocity of 1.7 × 102 m/s?
What is the wavelength, in nanometers, of an electron that is moving at a velocity of 2.9 × 105 m/s?
The spectrum below is of the hydrogen atom in the visible region. Label each emission line with the wavelength, the initial quantum number, and the final quantum number. Hydrogen (H)
What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the Bohr orbit with n = 3 to the orbit with n = 1? In what region
The charge of an electron is -1.602 × 10-19 C. How many microamperes (1 A = 1 C/s) of electrical current are produced by a photoelectric cell that ejects 2.50 × 1013 electrons each second? How
The charge of an electron is -1.602 × 10-19 C. How many electrons must be ejected from the metal each second to produce an electric current of 1.0 mA (1 A = 1 C/s)? How many photons must be
Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the photoelectric threshold frequency for sodium metal?
The photoelectric threshold frequency for carbon is 1.16 × 1015 s-1.(a) What is the longest wavelength of light that will eject electrons from a sample of solid carbon? What is the name of the
The red color of neon signs is due to electromagnetic radiation with a wavelength of 640 nm. What is the change in the energy of a neon atom when it emits a photon of this wavelength?
The yellow light emitted by sodium vapor consists of photons with a wavelength of 589 nm. What is the energy change of a sodium atom that emits a photon with this wavelength?
What is the energy (in kJ) of 1 mol of photons with a frequency of 2.50 × 1014 Hz?
What is the energy (in kJ) of 1 mol of photons with a frequency of 3.70 × 1015 Hz?
The photoelectric effect for cadmium has a threshold frequency of 9.83 × 1014 Hz. For light of this frequency, fi nd the following characteristics:(a) The wavelength(b) The energy of one photon (in
This laser emits green light with a wavelength of 533 nm.(a) What is the energy, in joules, of one photon of light at this wavelength?(b) If a particular laser produces 1.00 watt (W) of power (1 W =
The electromagnetic radiation used by amateur radio operators has a wavelength of 10 m. Calculate the frequency (in s-1) of this electromagnetic radiation.
The wavelength used by citizen’s band radio is 21 m. Calculate the frequency (in s-1) of this electromagnetic radiation.
Gamma rays are electromagnetic radiation of very short wavelength emitted by the nuclei of radioactive elements. Strontium-91 emits a gamma ray with a frequency of 2.47 × 1020 Hz. Express the
Gamma rays are electromagnetic radiation of very short wavelength emitted by the nuclei of radioactive elements. Arsenic-74 emits a gamma ray with a frequency of 1.44 × 1020 Hz. Express the
An FM radio station broadcasts at a frequency of 101.3 MHz. What is the wavelength, in meters and nanometers, of this radiation?
An AM radio station broadcasts at a frequency of 580 kHz. What is the wavelength, in meters and nanometers, of this signal?
Microwave ovens operate using radiation that has a frequency of 2.45 × 109 Hz. What is the wavelength of this radiation? What name is used for the spectral region of this radiation?
The human eye is most sensitive to light that has a frequency of 5.41 × 1014 Hz. What is the wavelength of this light? What name is used for the spectral region of this radiation?
The introduction to this chapter indicates that lead is the main component of bullets. The strongest emission from excited-state Pb atoms has a wavelength of 405.8 nm. What is the frequency of this
Tin is a component of some bullets. The most intense light that is emitted by excited tin atoms has a wavelength of 284.0 nm. What is the frequency of this light (measured in s-1)? Name the spectral
Use the Pauli exclusion principle to explain why the 3p subshell can contain a maximum of six electrons.
State Hund’s rule; then use it to explain why there are two unpaired electrons in both the carbon atom and the oxygen atom.
State the Pauli exclusion principle; then use it to explain why an orbital can contain a maximum of two electrons.
Draw an energy-level diagram for a multielectron atom through n = 3.
How and why do the energy-level diagrams for the hydrogen atom and the many-electron atom differ?
Why is the Heisenberg uncertainty principle an important factor for electrons in atoms but unimportant for large objects such as a baseball?
Explain what is meant by “penetration” in the explanation of the dependence of electron energies on the ℓ quantum number.
How is the effective nuclear charge different from the nuclear charge in a beryllium atom? Is the effective nuclear charge the same for all electrons in this atom? Explain.
How is interelectronic repulsion related to shielding?
In a carbon atom, do the 2s or 2p electrons experience a higher effective nuclear charge? Explain.
(a) Which quantum number is related to the average distance of the electron from the nucleus?(b) What name and symbol are used for the quantum number that determines the shape of the electron
How does the electron spin quantum number affect the energy of the electron in the hydrogen atom?
How is the wave function, ψ, related to the location of the electron in space?
How did de Broglie justify Bohr’s assumption that angular momentum was quantized?
What assumptions did Bohr make in explaining the hydrogen atom spectrum?
Why are there many more lines observed in the emission spectra of hydrogen and other elements than are found in their absorption spectra?
The most intense emissions of silver and bismuth, both elements found in bullets (see the chapter introduction), are 328.1 and 195.5 nm, respectively. Compare the energies and frequencies of light
Two light sources have exactly the same color, but the second source has twice the brightness of the first. Which of the four characteristics of a light wave (amplitude, speed, frequency, wavelength)
The container above contains a gas and has a piston that can move. Redraw this container; then draw the container again after the pressure on top of the piston has doubled.
Explain why most gases deviate from ideal behavior at low temperatures but not at high temperatures.
Express a pressure of 433 torr in atmospheres.
Express a pressure of 0.450 atm in the following units:(a) Torr(b) KPaStrategyUse the relationship 1 atm = 760 torr to determine the pressure in torr and the equality 1 atm = 101.3 kPa to determine
Describe the similarities and differences between the ways in which a gas and a liquid occupy a container.
Calculate ΔH for Mg(s) + O₂(g) → MgO(s) 2 AH = ? given the equations Mg(s) + 2HCl(aq) →MgCl₂(aq) + H₂(g) 2H₂(g) + O₂(g) → 2H₂O(l) ΔΗ = -462 kJ MgO(s) + 2HC1(aq) → MgCl₂(aq) +
What are the molar concentrations of the ions in a 0.20 M calcium nitrate, Ca(NO3)2, solution?StrategyIn aqueous solution, Ca(NO3)2 dissociates into one Ca2+(aq) and two (aq) ions.Use the
Describe how atmospheric pressure is measured with a barometer and how pressure differences are measured with an open-end manometer.
A balloon containing 575 mL nitrogen gas at a pressure of 1.03 atm is compressed to a final volume of 355 mL. What is the resulting pressure of the nitrogen?
A sample of argon gas at an initial pressure of 1.35 atm and an initial volume of 18.5 L is compressed to a final pressure of 3.89 atm. What is the final volume of the argon? Assume temperature and
Compare the densities of a single substance as a solid, a liquid, and a gas.
At a pressure of 740 torr, a sample of gas occupies 5.00 L. Calculate the volume of the sample if the pressure is changed to 1.00 atm at constant temperature.
In the lungs of a deep-sea diver (V = 6.0 L) at a depth of 100 m, the pressure of the air is 7400 torr. At a constant temperature of 37 °C, to what volume would the air expand if the diver were
Th e volume of a sample of nitrogen gas increases from 0.440 L at 27 °C to 1.01 L as it is heated to a new temperature. Calculate the new temperature of the nitrogen.
A balloon filled with oxygen gas at 25 °C occupies a volume of 2.1 L. Assuming that the pressure remains constant, what is the volume at 100 °C?StrategyConvert the temperatures to kelvins and use
Make a drawing of an open-end manometer measuring the pressure of a sample of a gas that is at 200 torr. Assume the pressure on the open end is 1.00 atm.
The pressure of a sample of gas is 2.60 atm in a 1.54-L container at a temperature of 0 °C. Calculate the pressure exerted by this sample if the volume changes to 1.00 L and the temperature changes
Define three units that are used to express pressure.
A helium weather balloon is filled to a volume of 219 m3 on the ground, where the pressure is 754 torr and the temperature is 25 °C. As the balloon rises, the pressure and temperature decrease, so
Calculate the temperature of a 350-mL container that holds 0.620 mol of an ideal gas at a pressure of 42.0 atm.
Describe the change in the volume of a gas sample that occurs when each of the following three properties is increased with the other two held constant:(a) Pressure(b) Temperature(c) Amount
Calculate the pressure of a 1.2-mol sample of methane gas in a 3.3-L container at 25 °C.StrategySubstitute the given values into the ideal gas law, being sure to match the units given in the ideal
An experiment shows that a 0.495-g sample of an unknown gas occupies 127 mL at 98 °C and 754 torr pressure. Calculate the molar mass of the gas.StrategyUse the data given in the problem to calculate
Calculate the molar mass of a gas if a 9.21-g sample occupies 4.30 L at 127 °C and a pressure of 342 torr.
Describe an experiment with a gas that allows the determination of absolute zero on the temperature scale. In this experiment, is the temperature of absolute zero measured directly?
What is the density of N2 gas at 1.00 atm and 100 °C?StrategyDensity is mass per unit volume. The mass of 1 mol nitrogen is 28.0 g . Use the ideal gas law to calculate the volume of 1 mol of a gas
Calculate the density of H2 gas at 1.00 atm and 100 °C.
Many scientists believe that when Earth’s atmosphere evolved, some of the oxygen gas came from the decomposition of water induced by solar radiation.What volume of oxygen at 754 torr and 40 °C
Demonstrate how Boyle’s, Charles’s, and Avogadro’s laws can be obtained from the ideal gas law.
Derive an equation for density of a gas from the ideal gas law.
Nitrogen monoxide, NO, is a pollutant formed in running automobile engines. It reacts with oxygen in the air to produce nitrogen dioxide, NO2. Calculate the volume of NO2 gas produced and the volume
Chemists frequently prepare hydrogen gas in the laboratory by the reaction of zinc and hydrochloric acid. Th e other product is ZnCl2(aq). Calculate the volume of hydrogen produced at 744 torr
Hydrogen, H2, and chlorine, Cl2, react to form hydrogen chloride, HCl. Calculate the volume of HCl formed by the reaction of 2.34 L H2 and 3.22 L Cl2.
A gas sample in a 1.2-L container holds 0.22 mol N2 and 0.13 mol O2. Calculate the partial pressure of each gas and the total pressure at 50 °C.StrategyUse the ideal gas law to calculate the partial
Why do 1 mol N2 and 1 mol O2 both exert the same pressure if placed in the same 20-L container? Is the mass of the gas sample the same in both cases? Explain why it is the same or diff erent, and if
Calculate the partial pressure of each gas and the total pressure in a 4.6-L container at 27 °C that contains 3.22 g Ar and 4.11 g Ne.
Calculate the number of moles of hydrogen produced by the reaction of sodium with water. In the reaction, 1.3 L gas is collected by water displacement at 26 °C. The atmospheric pressure is 756 torr.
List the four assumptions of the kinetic molecular theory.
A sample of KClO3 is heated and decomposes to produce O2 gas. Th e gas is collected by water displacement at 26 °C. Th e total volume of the collected gas is 229 mL at a pressure equal to the
Calculate the rms speed of neon atoms at 27 °C.
Discuss the origin of gas pressure in terms of the kinetic molecular theory.
Calculate the rms speed in meters per second of argon atoms at 27 °C.StrategyUse Equation 6.6, remembering to use the proper values and units for R, to convert the molar mass into units of kilograms
Calculate the molar mass of a gas if equal volumes of oxygen gas and the unknown gas take 3.25 and 8.41 minutes, respectively, to effuse through a small hole under conditions of constant pressure and
Draw an approximate Maxwell–Boltzmann distribution curve for the distribution of speeds of gas molecules. What are the units on each axis? About where is the root mean-square speed on the curve?

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