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computer science
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engineering
A construction company bought a 180,000 metric ton earth sifter at a cost of $65,000. The company expects to keep the equipment a maximum of 7 years. The operating cost is expected to follow the series described by 40,000 + 10,000k, where k is the number of years since it was purchased$ $( k = 1,2 , \dots , 7 )$ $. The salvage value is estimated to be$30,000 for years 1 and 2 and $20,000 for years 3 through 7. At an interest rate of 10% per year, determine the economic service life and the associated equivalent annual cost of the sifter.
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engineering
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Which of the following compounds have resonance structures?
D) O3
Consider the Lewis structures for the compound SO3 and the polyatomic ions SO32- and SO42-. Which of these would exist as a set of resonance structures?
A) SO3 only
What is the angle between electron groups in the linear electron geometry
D) 180
What is the angle between electron groups in the trigonal planar electron geometry?
120°
What is the angle between electron groups in the tetrahedral geometry?
109.5°
What is the electron geometry if you have 2 electron groups around the center atom?
A) linear
What is the electron geometry if you have 3 electron groups around the center atom?
B) trigonal planar
What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom?
D) trigonal pyramidal
Which of the following compounds would have a linear molecular geometry?
1. N2
2. H2S
3. CO2
B) 1 and 3 only
What is the molecular geometry of carbon dioxide, CO2?
B) linear
11) What is the correct Lewis structure for CN⁻?
D) [: C≡ N :]⁻
Which symbol should be used between two structures that represent resonance structures?
C) ↔
Which of the statements about light is FALSE?
E) All of the above statements are true.
The distance between adjacent wave crests is called
wavelength
The number of cycles of a wave that passes a stationary point in one second is called its
frequency
Which color of the visible spectrum has the longest wavelength (750 nm)?
Red
Which color of the visible spectrum has photons with the most energy?
Violete
Which form of electromagnetic radiation has the highest frequency?
Gamma rays
Which form of electromagnetic radiation has the lowest frequency?
Radio waves
The n = ________ principal shell is the lowest that may contain a d-subshell.
3
Which subshell letter corresponds to a spherical orbital?
S
When filling orbitals of equal energy, electrons fill them singly first with parallel spins." This is known as:
Hunds Rule
An accepted abbreviation format is to write an electron configuration that includes a noble gas symbol in brackets. If you were writing an electron configuration for a bromine atom, which elemental symbol would you place in the bracket?
Ar
Which element is represented by the electron configuration 1s22s22p2?
Carbon
What is the electron configuration for Kr?
1s22s22p63s23p64s23d104p6
What do the alkali metals all have in common?
All of the above
Which of the following elements has the electron configuration of 3s23p4 in its outermost shell?
C) S
Chlorine and bromine have very similar chemical properties. This is best explained by the fact that both elements
C) have the same number of valence electrons.
One mole of F2 gas at STP would take up twice the volume of one mole of Ar gas at STP.
False
If the number of gas particles is halved, the volume of the gas will be halved given that the temperature and pressure do not change.
True
1 atm is equal to:
E) all of the above
What is the equivalent pressure of 1520 torr in units of atm?
C) 2.00
What is the equivalent pressure of 760 torr in units of mm Hg?
A) 760
Which of the following statements is TRUE for gases?
1. The temperature of a gas is inversely proportional to its pressure.
2. The volume of a gas is directly proportional to the pressure in torr.
3. The pressure of a gas is due to collisions of the gas molecules.
Only 3
Boyle's Law is expressed as:
A) V is proportional to 1/p
36) To solve problems using Boyle's Law, which mathematical equation should be used?
B) P1V1 = P2V2
One liter of a gas is in a sealed chamber containing a moveable piston. If the piston is moved so that the volume of the gas is compressed to a volume of one-half liter, what will happen to the pressure on the gas? (Assume the temperature is constant and no gas particles are lost.)
C) The pressure will be twice the original value.
A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?
B) 0.154 L
To solve problems using Charles's Law, which mathematical equation should be used?
A)
A gas sample occupies 3.50 liters of volume at 20.°C. What volume will this gas occupy at 100.°C (reported to three significant figures)?
C) 4.46 L
A balloon originally had a volume of 0.439 L at 44°C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378 mL if the pressure remained constant?
A) 0°C
Avogadro's Law is expressed as:
D) V is proportional to n
43) To solve problems using Avogadro's Law, which mathematical equation should be used?
C
A sample of 0.255 mole of gas has a volume of 748 mL at 28°C.
Calculate the pressure of this gas.
(R= 0.0821 L ∙ atm / mol ∙ K)
A) 8.42 atm
What is the pressure of a 3.00 L gas vessel that has 18.0 grams of helium at 25°C?
(R= 0.0821 L atm/ mol K)
B) 36.7 atm
46) If a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
D) 1.75 atm
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Verified questions
physics
A solenoid $4.00 \mathrm{~cm}$ in diameter and $20.0 \mathrm{~cm}$ long has 250 turns and carries a current of $15.0 \mathrm{~A}$. Calculate the magnetic flux through the circular cross-sectional area of the solenoid.
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physics
Suppose the generator connected to a series RCL circuit has a frequency that is greater than the resonant frequency of the circuit. Suppose, in addition, that it is necessary to match the resonant frequency of the circuit to the frequency of the generator. To accomplish this, should you add a second capacitor (a) in series or (b) in parallel with the one already present?
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physics
A boat that travels at a speed of $6.75\ \mathrm{m/ s}$ in still water is to go directly across a river and back . The current flows at $0.50\ \mathrm{m/ s}$. (a) At what angle(s) must the boat be steered? (b) How long does it take to make the round trip? (Assume that the boat's speed is constant at all times, and neglect turnaround time.)
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chemistry
Write formulas for all the ionic compounds that can be formed by combinations of these ions: ${Na}^{+}$, ${Ni}^{2+}$, ${SO_4}^{2-}$, and ${Cl}^{-}$.
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