CEM 141 Exam 2 (New 2026/ 2027 Update)
Questions & Answers {Grade A} 100%
Correct (Verified Solutions) -MSU
What is the wavelength of light that has a frequency of 3.0 GHz (3 x 10^6 Hz)? - Correct
answer 100 m
What wavelength of light would break a O=O bond (it takes 8.3 x 10^-19 J to break one
bond)? - Correct answer 240 nm
How does the existence of atoms help explain the conversion of matter? - Correct
answer The existence of atoms shows that matter is conserved because the reaction
has to be balanced. There cannot just be a random atom put in or taken out. Both sides
have to have the same amount of atoms.
Atomic absorption spectra are caused by.... - Correct answer Electrons moving to
higher energy levels and absorbing photons of energy equal to the energy difference
between the levels.
,How many core and valence electrons does carbon have? - Correct answer 2 core, 4
valence
What is the electron configuration of Se? - Correct answer [Ar] 4s^2 3d^10 4p^4
Molar Mass - Correct answer mass of 1 mole in grams
What is the best explanation for a pattern such as those obtained when X-Rays are
diffracted by crystals? - Correct answer The waves of electromagnetic radiation arrive
in-phase and out of phase at the detector.
The first ionization energy of an element in the third row (Na-Ar) of the periodic table
is 578 kJ/mol, its second IE is 1820, the 3rd is 2750 and the 4th is 11600, and the 5th is
14842. Which element do you think this is? - Correct answer Aluminum
How many grams of N2 would be required to produce 2.75 moles of NH3? - Correct
answer 38.5g N2
, How many moles of Ca(NO3)2 are in 325g? - Correct answer 1.98 mole Ca(NO3)2
How much Carbon Dioxide would be produced if 10 kg of methane are combusted in
excess oxygen? - Correct answer 27,500 g CO2
How much carbon dioxide would be
produced if an excess of methane is
combusted in 10 g oxygen? - Correct answer 6.9g of CO2
How many moles of NH3 would be produced if 6 moles of H2 reacted with 3 moles of
N2? - Correct answer 6 mole of NH3
Limiting Reactant - Correct answer Calculate the amount of product possible from
each reactant. Whichever produces the least
product is the limiting reactant.
Percent Yield - Correct answer (actual amount produced/theoretical amount) x 100
Questions & Answers {Grade A} 100%
Correct (Verified Solutions) -MSU
What is the wavelength of light that has a frequency of 3.0 GHz (3 x 10^6 Hz)? - Correct
answer 100 m
What wavelength of light would break a O=O bond (it takes 8.3 x 10^-19 J to break one
bond)? - Correct answer 240 nm
How does the existence of atoms help explain the conversion of matter? - Correct
answer The existence of atoms shows that matter is conserved because the reaction
has to be balanced. There cannot just be a random atom put in or taken out. Both sides
have to have the same amount of atoms.
Atomic absorption spectra are caused by.... - Correct answer Electrons moving to
higher energy levels and absorbing photons of energy equal to the energy difference
between the levels.
,How many core and valence electrons does carbon have? - Correct answer 2 core, 4
valence
What is the electron configuration of Se? - Correct answer [Ar] 4s^2 3d^10 4p^4
Molar Mass - Correct answer mass of 1 mole in grams
What is the best explanation for a pattern such as those obtained when X-Rays are
diffracted by crystals? - Correct answer The waves of electromagnetic radiation arrive
in-phase and out of phase at the detector.
The first ionization energy of an element in the third row (Na-Ar) of the periodic table
is 578 kJ/mol, its second IE is 1820, the 3rd is 2750 and the 4th is 11600, and the 5th is
14842. Which element do you think this is? - Correct answer Aluminum
How many grams of N2 would be required to produce 2.75 moles of NH3? - Correct
answer 38.5g N2
, How many moles of Ca(NO3)2 are in 325g? - Correct answer 1.98 mole Ca(NO3)2
How much Carbon Dioxide would be produced if 10 kg of methane are combusted in
excess oxygen? - Correct answer 27,500 g CO2
How much carbon dioxide would be
produced if an excess of methane is
combusted in 10 g oxygen? - Correct answer 6.9g of CO2
How many moles of NH3 would be produced if 6 moles of H2 reacted with 3 moles of
N2? - Correct answer 6 mole of NH3
Limiting Reactant - Correct answer Calculate the amount of product possible from
each reactant. Whichever produces the least
product is the limiting reactant.
Percent Yield - Correct answer (actual amount produced/theoretical amount) x 100
