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cem 141 exam _s 2 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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cem 141 exam _s 2 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
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  • cem 141 exam s 2

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  • Chemistry 141
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cem 141 exam ?s 2
1.204 x 10^24 H atoms - ANS-how many hydrogen atoms are there in one mole of CH2Cl2

2 NH3 + 5 O2 ---> 2 NO + 4H2O? - ANS-ammonia reacts with oxygen to produce nitric oxide
and water. Balance the equation using small, whole number coefficients:

____NH3 + ____O2 ---> ____NO + ____H2O

5 - ANS-what is the coefficient for oxygen O2

84% - ANS-hydrogen reacts with oxygen to produce water according to the following equation:
2 H2 + O2 ---> 2 H2O.

you start a reaction with 53 grams of H2 and excess O2 and you end up producing 400 grams
of H2O.
Whaat is the percent yield for this reaction?

when light shines through a double slit, a pattern of bright and dark lines appear - ANS-select
the evidence that supports the claim that light is a wave

waves of light interfere constructively when they arrive in-phase and destructively when they
arrive out-of-phase - ANS-select the reasoning that supports the claim that light is a wave

the absorption lines for hydrogen would appear at exactly the same wavelengths, because the
energies of the photons emitted and absorbed by hydrogen are the same - ANS-hydrogen
produces emission lines (colored lines of the spectrum) with the following wavelengths: 410 nm,
434 nm, 486 nm, and 656 nm.
Where would you expect to see the absorption lines (dark lines) for hydrogen on its absorption
spectrum and why?

E= 2 x 10^-19 J - ANS-the energies of four photons of light are listed below. Which photon has
the longest wavelength?

LOOK
E= 8 X 10^-16 J
E= 2 x 10^-19 J

LOOK
hv and hv just go to the metal, no electrons coming out - ANS-the diagram to the right shows
what happens when ORANGE LIGHT shines on a piece of metal. Which of the diagrams below

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