# I have multiple questions

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A. If an element with the valence configuration 4s2 loses 2 electron(s), these electron(s) would be removed from the subshell(s).

B. An element with the valence electron configuration 3s23p5 would form a monatomic ion with a charge of .
In order to form this ion, the element will (lose/gain) electron(s) from/into the subshell(s).

2. A local AM radio station broadcasts at a frequency of 841.7 kHz.

Calculate the wavelength at which they are broadcasting.
Wavelength = meter

(1 kHz = 1000 sec -1)

3. A local FM radio station broadcasts at a frequency of 98.4 MHz.

Calculate the energy of the frequency at which they are broadcasting.
Energy = kJ

(1 MHz = 106 sec -1)

4.

 Compare the deBroglie wavelength of a proton moving at 1.30×107 miles per hour (5.81×106 m/s) to that of a baseball moving at 90.0 miles per hour (40.2 m/s) and an alpha particle with a speed of 3.40×107 miles per hour (1.52×107 m/s).

Which region of the electromagnetic spectrum are each of these wavelengths near ?

 A. Ultraviolet 10-8 to 10-7 meters B. X-ray 10-11 to 10-8 meters C. Gamma ray 10-16 to 10-11 meters D. Smaller than 10-20 meters. Cannot detect wave-like properties. Only particle-like behavior will be observable.
 Particle Mass (kg) Velocity (m/s) Wavelength Region proton 1.67×10-27 5.81×106 baseball 0.140 40.2 alpha particle 6.64×10-27 1.52×107

5. The speed of sound in dry air at 20 °C is 343.5 m s-1, and the frequency of the sound from the note A# below middle C on the piano is 233.1 s-1(according to the American standard pitch scale). Calculate the wavelength of the sound and the time it will take to travel 31.2 m across a concert hall.

Wavelength = m

Time = s

6. Using SPECTROSCOPIC notation write the complete electron configuration for the vanadium atom.

Using NOBLE GAS notation write the electron configuration for the copper atom.

7.(1) What is the valence electron configuration for the chlorine atom?

(2) What is the valence electron configuration for the phosphorus atom?

8. 1. For the central silicon atom:

 ... the number of lone pairs = . the number of single bonds = . the number of double bonds = .

2. The central silicon atom

 ... A. obeys the octet rule. B. has an incomplete octet. C. has an expanded octet.

8.The enthalpy change for the following reaction is 66.4 kJ. Using bond energies, estimate the N=O bond energy in NO2(g).

N2(g) + 2O2(g)2NO2(g)

kJ/mol

9.
Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction:

4NH3(g) + 5O2(g)4NO(g) + 6H2O(g)

kJ

Aljon2017
School: New York University

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