Frequency and wavelength are related by the equation

 

A) l= c n

B) l = c/n

C) v = l/c 

D) l = v/c 

E) c = l/n

 

Calculate the energy in kJ/mol of light with a wavelength of 360 nm.

 

A) 5.52 x 10 ^-22 kJ/mol

B) 5.52 x 10 ^-19 kJ/mol

C) 333 kJ/mol

D) 6.63 x 10 ³ kJ/mo!

E) 0.333 kJ/mol

 

A television signal has a wavelength of 10.0 km. What is its frequency

in kilohertz?

 

A) 30.0

B) 3.00x 10 ⁴

C) 3.00 x 10 ⁷

D) 3.33 x I0 ^-7

E) 3.33 x I0 ^-2

 

 

A radiation detector exposed to sunlight records the energy falling on a given area each second. If such a detector has a reading of 0.698 cal cm² min¹, how many photons of sunlight are striking each cm² in one

minute?

 

Assume the average wavelength of sunlight is 460 nm. (4.181 J = 1 cal)

 

A) 1.62 x 10 ¹⁸

B) 4.32 x 10 ¹⁹

C) 6.76 x 10 ¹⁸

D) 2.31 x i0 ¹⁸

E) 9.63 x 10 ¹⁹

 

 

 

 

 

In a non-hydrogen atom, orbitals with the same energy

a) extend the same distance from the nucleus.

b)  have the same principle quantum number, n.

c)  are referred to as isoelectronic.

d)  are referred to as degenerate.

e)  are represented by 1s and 2s orbitals.

 

1s²2s²2p⁶3s²3p⁶3d³4s² is the ground state electronic configuration of:

 

A)     scandium

B)     niobium

C)     chromium

D)     vanadium

E)     none of these

 

 

The fact that we cannot simultaneously measure the exact position and precise momentum of an electron is refered to as

 

A) Pauli’s Exclusion Principle

B) The Aufbau Principle

C) Hund’s Rule

D) The DeBroglie Relationship

E) Heisenberg’s Uncertainty Principle

 

An atomic orbital represents:

 

A) the shape of an atom

B) the repulsion of all the electrons among themselves

C) a fixed path that an electron follows around the nucleus of an atom

D) the region of electron density for a covalent bond

E) the region of high probability for an electron around the nucleus of

     an atom

 

What is the total number of orbitals possible for n = 3?

 

A) 9   

B) 6 

C) 5 

D) 3 

E) 11

 

 

 

 

Which one of the following set of quantum numbers would not be allowed?

 

A) n=3, l=2,m_l=l

B) n=3, l=0,m_l= 0

C) n=3, l=3,m_l=1

D) n=3, l=2,m_l=—1

E) n = 3, l = 1, m_l= - 1

 

 

 

Light passing through a transparent medium has a wavelength of 466 nm and a frequency of 6.20 X 10¹⁴ Hz. What is the speed of the light in the medium?

 

A) 2.89 X 10⁸m/s

B) 2.89  X 10¹⁷m/s

C) 1.33  X 10¹² m/s

D)1.33 X 10²¹ m/s

E) 7.52X 10  ²² m/s

 

 

 

An orbital is a reference to

 

a) a region of high electron density.

b) a region in an atom where an electron is likely to be found.

c) a wave function resulting from specific values assigned to quantum numbers in wave equations.

d) a spherical region around a nucleus where an electron can be found.

 

A)     b only

B)     a and b

C)     bandc

D)     a, b, and c

E)     all of the above

 

Which of the following statements concerning quantum numbers is NOT correct?

A) “n” relates the most probable distance from the nucleus.

B) “l” denotes geometric shape.

C) “m_l” denotes orientation of an orbital with respect to the others.

D) The fourth quantum number refers to electron spin.

E) The four quantum numbers are derived from wave mechanics.

 

 

When an electron goes from a high energy state to a low one, what occurs?

 

A) another electron goes from a low energy state to a high one

B) the atom moves faster

C) light is given off

D) this process is not possible

E) none of these answers

 

 

Use the basic rules for electron configuration to indicate the number of unpaired electrons in phosphorus.

 

A) 0

B) 1

C) 3

D) 5

E) 2

 

 

The four quantum numbers of the LAST electron to be placed into a ground state Ca atom could be:

 

A) n = 4, l = 1, m_l = 0,m_s= -1/2

 

B) n = 3, l = 0, m_l = I, m_s = ½

 

C) n = 4, l = 1, m₁ = 0,m_s = +1/2

 

D) n=4,  l = 0, m_l=0, m_s= ½

 

E) none of these

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