Chemistry Final Test 3

Line spectra from all regions of the electromagnetic spectrum, including the Paschen series of infrared lines for hydrogen, are used by astronomers to identify elements present in the atmospheres of stars. Calculate the wavelength of the photon emitted when the hydrogen atom undergoes a transition from n= 5 to n= 3. - 205.1 nm - 384.6 nm - 683.8 nm - 1282 nm - > 1500 nm

1282 nm (1.0974 x 10^7)x(1/9 x 1/25) ^-1 = 1.281

If the energy of a photon is 1.32x10^-18 J, what is its wavelength in nm? - 1.50 x 10^-7 nm - 150 nm - 1.99 x 10^15 nm - 1.99 X 10^24 nm

150nm (6.626 x 10^-34)x(2.998x10^8) / (1.32 x 10^-18)

Select the correct electron configuration for sulfur (z= 16) - 1s^2 1p^6 2s^2 2p^6 - 1s^2 2s^2 2p^8 3s^2 3p^4 - 1s^2 2s^2 2p^8 3s^2 3p^2 - 1s^2 2s^2 2p^6 3s^2 3d^4 - 1s^2 2s^2 2p^6 3s^2 3p^4

1s^2 2s^2 2p^6 3s^2 3d^4

The FM station KDUL broadcasts music at 99.1 MHz. Find the wavelength of these waves. - 1.88 x 10-2 m - 0.330 m - 3.03 m - 5.33 x10^2 m - > 10^3 m

3.03 m Speed / Frequency = (3.0 x 10^8)/(99.1 x 10^8)

In a single atom, what is the maximum number of electrons which can have quantum number n= 4? - 16 - 18 - 32 - 36 - none of the above

32

Select the correct set of quantum numbers (n, l, ml, ms) for the highest energy electron in the ground state of potassium, K. - 4, 1, -1, 1/2 - 4, 1, 0, 1/2 - 4, 0, 1, 1/2 - 4, 0, 0, 1/2 - 4, 1, 1, 1/2

4, 0, 0, 1/2

Select the correct set of quantum numbers (n, l, ml, ms) for the first electron removed in the formation of a cat for strontium, Sr. - 5, 1, 0, -1/2 - 5, 1, 0, 1/2 - 5, 0, 1, 1/2 - 5, 1, 1, 1/2 - 5, 0, 0, -1/2

5, 0, 0, -1/2

Which of the following elements has the smallest atomic size? - Na - Ar - K - C - Kr

Ar

Which of the following elements has the largest atomic size? - S - Ca - Ba - Po - Rn

Ba

Which of the following elements has the largest first ionization energy? - Na - Cl - Ca - Te - Br

Cl

Select the element with the greatest metallic character. - Li - Ca - Al - Pb - Cs

Cs

(TRUE/FALSE) In the quantum mechanical treatment of the hydrogen atom, the probability of finding an electron at any point is proportional to the wave function psi.

FALSE

(TRUE/FALSE) The energy of a photon is directly proportional to the wavelength of the radiation.

FALSE

Select the element with the least metallic character. - Sn - Sr - Tl - Ge - Ga

Ge

Who proposed the principle which states that one cannot simultaneously know the exact position and velocity of a particle? - Einstein - Planck - Heisenberg - Compton - de Broglie

Heisenberg

''Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the sub shell is more than half-filled'' is a statement of - the Aufbau principle - the Pauli exclusion principle - Hund's rule - Periodic law

Hund's rule

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy. - radio, visible, infrared, ultraviolet - infrared, visible, ultraviolet, microwave - visible, ultraviolet, infrared, gamma rays - X-radiation, visible, infrared, microwave - microwave, Infrared, Visible, Ultraviolet

Microwave, Infrared, Visible, Ultraviolet

The electron structure 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 refers to the ground state of - Kr - Ni - Fe - Pd - None of these choices is correct

Ni

What is the correct order of decreasing size of the following ions? - P^3- > Cl- > K+ > Ca2+ - Ca2+ > K+ > Cl- > P^3- - K+ > Cl- > Ca2+ > P^3- - K+ > Cl- > P^3- > Ca2+ - None of these is correct.

P^3- > Cl- > K+ > Ca2+

Which of the following elements has the smallest first ionization energy? - Rb - Mg - I - As - F

Rb

Which of the following elements will form a cation with a +2 charge? - Si - Sr - Ga - Cs - S

Sr

(TRUE/FALSE) At the quantum level, a particle can behave like a wave and can even have a ''wavelength''.

TRUE

Electromagnetic radiation of 500nm wavelength lies in the ------ region of the spectrum. - Infrared - Visible - Ultraviolet - X-ray - Y-ray

Visible

Select the electron configuration for Te (z= 52) - [Kr] 5s^2 5p^6 4d^8 - [Kr] 5s^2 5d^10 5p^4 - [Kr] 5s^2 4d^10 4p^6 - [Kr] 5s^2 4f^14 - [Kr] 5s^2 4d^10 5p^4

[Kr] 5s^2 4d^10 5p^4

Write the electron configuration for Seaborgium (Element 106):

[Rn] 7s^2 6d^4 5f^14

The shape of an atomic orbital is associated with: - the principal quantum number (n) - the angular momentum quantum number (l) - the magnetic quantum number (ml) - the spin quantum number (ms) - none of these choices is correct

angular momentum quantum number (l)

Write the 4 quantum numbers for the last electron in Cobalt (Element 27):

n= 3 l= 2 ml= -1 ms= -1/2

Which of the following is a correct set of quantum number for an electron in a 3d orbital? - n= 3, l= 0, ml= -1 - n= 3, l= 1, ml= +3 - n= 3, l= 2, ml= 3 - n= 3, l= 3, ml= +2 - n= 3, l= 2, ml= -2

n= 3, l= 2, ml= -2

In the quantum mechanical treatment of the hydrogen atom, which one of the following combinations of quantum numbers is not allowed? (n, l, ml) - 3, 0, 0 - 3, 1, -1 - 3, 2, 2 - 3, 2, -1 - 3, 3, 2

n= 3, l= 3, ml= 2

''Each statement in an atom must have its own unique set of quantum numbers'' is a statement of - the Aufbau principle - the Pauli exclusion principle - Hund's rule - Periodic law

the Pauli exclusion principle

The orientation in space of an atomic orbital is associated with: - the principal quantum number (n) - the angular momentum quantum number (l) - the magnetic quantum number (ml) - the spin quantum number (ms) - none of these choices is correct

the magnetic quantum number (ml)

The size of an atomic orbital is associated with: - the principal quantum number (n) - the angular momentum quantum number (l) - the magnetic quantum number (ml) - the spin quantum number (ms) - none of these choices is correct

the principal quantum number (n)

Elements with the highest first ionization energies are found in the --- region of the periodic table. - lower left - upper left - center - lower right - upper right

upper right