CHEM 121 FINAL COMPLETE EXAM QUESTIONS WITH 100% CORRECT DETAILED SOLUTIONS || GUARANTEE PASS <LATEST VERSION>
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Course
CHEM 121
Institution
CHEM 121
CHEM 121 FINAL COMPLETE EXAM
QUESTIONS WITH 100% CORRECT
DETAILED SOLUTIONS ||
GUARANTEE PASS <LATEST
VERSION>
1. The Bohr theory of the atom expanded older theories by stating that
an electrons energy was quantized in what - ANSWER Energy
Levels
2. If the wav...
CHEM 121 FINAL COMPLETE EXAM
QUESTIONS WITH 100% CORRECT
DETAILED SOLUTIONS ||
GUARANTEE PASS <LATEST
VERSION>
1. The Bohr theory of the atom expanded older theories by stating that
an electrons energy was quantized in what - ANSWER ✔ Energy
Levels
2. If the wavelength of an wave is short, you would expect its frequency
to be what? - ANSWER ✔ Long
3. An electron is orbiting a nucleus as a standing wave. If we see that the
radius of the orbit is 9.55x10-15 and the wavelength is 1.00x10-14 , how
many whole wavelengths fit into one orbit? - ANSWER ✔ 6
4. Which element would be expected to have the highest ionization
energy?
V
Co
Fe
Ni - ANSWER ✔ FIGURE THIS OUT
5. True or false? Rubidium is in group 1 of the periodic table, so it must
have a high first ionization energy - ANSWER ✔ False
,6. What is the main difference between absorption spectra and emission
spectra? - ANSWER ✔ Emission spectra have bright line on a dark
background
7. Max Planck's equation says that all wave energy is quantized and his
constant is given by 6.63x10-34 . If the frequency of blue light is 4.20
x10-7 , what is the energy of blue light? - ANSWER ✔ 2.78 x10^-40
8. Pauli's Exclusion Principle states that "No two electrons in an atom
have the same four......." - ANSWER ✔ quantum numbers
9. What is the trend in the atomic radius in the periodic table? -
ANSWER ✔ Increases down the group
10. How many D electrons are there in Titanium (element 22)? -
ANSWER ✔ 2
11. Identify the following orbital:
(last one) - ANSWER ✔ D
12. How many orientations of P orbitals are there in an atom? -
ANSWER ✔ 3
13. For an atom, a student was solving Schrodinger's Equation and
arrived at the following quantum numbers. N=1, L=0. What type of
orbital is this? - ANSWER ✔ S
14. It is possible for a student to observing the position and the speed of
an electron with precise knowledge of both of these things at the same
time? - ANSWER ✔ false
,15. Group 1 metals are quite reactive. The reason that we see Na is
more reactive than Li is because........ - ANSWER ✔ Sodium will lose an
electron from an orbital further from the nucleus than Li
16. In 2010 Tennessine (Ts), new halogen was discovered. Its position
in the periodic table places it below the element At. How would you
expect the reactivity of Tennessine be compared to At? - ANSWER ✔
less
17. Would you consider putting sodium on a wet paper towel to be a
good idea or bad idea? - ANSWER ✔ bad
18. Which of these atoms would be an inner atom in any Lewis
Structure? - ANSWER ✔ Si
19. Indium is an element used in touch screens of smart phones. Its
element number 49 and sits in group 13 of the periodic table. What is its
valence? - ANSWER ✔ 3
20.The element lead has an electronegativity of 2.2. If it were bonded
covalently to Fluorine, electronegativity 4.0 the bonding is probably..... -
ANSWER ✔ Polar covalent
21. What is the difference between electronegativity and electron
affinity? - ANSWER ✔ Electronegativity is relative, electron affinity
can be quantified
22. The molecule BCl3 is seen below. This molecule is polar. Is that true
or false? - ANSWER ✔ false
23. The Lewis structure for Ammonia is shown below. Why is this
structure not correct? - ANSWER ✔ Nitrogen does not have a full octet
, 24. How could you fix the Lewis Structure for Ammonia to make it
correct? - ANSWER ✔ Add two electrons to the nitrogen atom
25. PCl5 is a stable molecule. NCl5 does not exist. Why is this? -
ANSWER ✔ Nitrogen cannot be hypervalent
26. A buddy from another University has made some progress on their
Lewis structure for SO2. You help them finish by.... - ANSWER ✔
Doubly bonding each O atom to the center S atom
27. How can we explain the bonding in Na-Br using the ideas of ionic
bonding with respect to sodium? - ANSWER ✔ Sodium bonds as a +1
ion to gain a full octet
28. "A new element, number 115 was discovered in 2003. It has been
named Moscovium and is found in group 15 of the periodic table. It
would therefore be expected to be less electronegative that element
116." Is this statement True or False? - ANSWER ✔ true
29. Consider the statement below. Is it true or false?
" The electronic structure of Germanium, element 32 shows its in the 4th
row of the periodic table. Therefore, the core electrons in Germanium
are in the 4th orbital from the nucleus." - ANSWER ✔ false
30. The carbonate ion is shown below with its associated resonance
structures. Why are three structures needed to show the bonding? -
ANSWER ✔ One Lewis structure is insufficient to describe the bonding
31. Which of these atoms would be the outer atom in a Lewis Structure?
B
C
O
N - ANSWER ✔ O
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