CHEM 1410 Exam 2
Which of these elements has the greatest electronegativity?
As
Which one of these ions is not isoelectronic with Kr?
As3+
Which of these molecules has an atom with an expanded octet?
AsCl5
Which one of these species is an ion?
B3+
Calculate the frequency of visible light having a wavelength of 686 nm.
4.37 × 10^14 s^-1
Which of these elements is chemically similar to magnesium?
Calcium
The alkali metal elements are found in _______ of the periodic table.
Group 1
Arrange the following bonds in order of decreasing polarity.
H - F > H - O > H - N > H - C
What is the formula of iodous acid?
HIO2
Which of these pairs consists of isoelectronic species?
K+ and Cl-
Which of the following is an ionic compound?
KI
What is the name of Mn(CO3)2?
Manganese (IV) Carbonate
Which is true concerning the molecular geometry of SF6?
The predicted F-S-F bond angles are 90° and 180°.
What is the correct characteristic of a nonmetals?
They have high electron affinities (so they commonly form anions).
What types of elements undergo covalent bonding?
Two nonmetals
The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?
Valence electrons
Which is the correct electron configuration for gold?
[Xe]4f145d106s1
Predict the molecular geometry and polarity of the SO2 molecule.
bent, polar
Electrons in an orbital with l = 3 are in a/an
f orbital
The general electron configuration for atoms of the halogen group is
ns2np5
The general electron configuration for noble gas atoms is
ns2np6
Valence bond theory predicts that carbon will use _____ hybrid orbitals in the carbonate anion, CO32-.
sp2
A molecule with the formula AB3 and a trigonal planar molecular geometry uses _________ to form its σ bonds.
sp2 hybrid orbitals
Indicate the type of hybrid orbitals used by the central atom in CCl4.
sp3
What is the hybridization of phosphorus in PCl3?
sp3
Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2-.
sp3d
According to the VSEPR model, a molecule with the general formula AB5 with one lone pair on the central atom will have a ______ molecular geometry.
square pyramidal
The compound, P4S10, is used in the manufacture of safety matches. What is its name?
tetraphosphorus decasulfide
What is the name of P4Se3 ?
tetraphosphorus triselenide
The shape of an atomic orbital is associated with
the angular momentum quantum number (l).
Select the element whose Lewis symbol is correct.
* Ra *
Which of the following elements has the largest atomic size?
Ba
Which of these species make an isoelectronic pair: Cl-, O2-, F, Ca2+, Fe3+?
Cl- and Ca2+
What element is represented by the electron configuration 1s22s22p63s23p64s13d5?
Cr
What is the formula for the permanganate ion?
MnO4-
Which one of these ions has the smallest radius?
Na+
Select the correct electron configuration for Te.
[Kr]5s24d105p4
Consider the element with the electron configuration [Kr]5s24d105p5. This element is
a Halogen
An anion is defined as
a charged atom or group of atoms with a net negative charge
Which response includes all the molecules below that have a central atom that does not follow the octet rule? (1) H2S (2) BCl3, (3) PH3 (4) SF4
(2) and (4)
Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.
** ** ** O = N - Cl : ** **
What is the electron configuration for tungsten?
1s22s22p63s23p64s23d104p65s24d105p66s24f145d4
How many electrons are in a single bond?
2
How many unpaired electrons does a ground-state atom of sulfur have?
2
How many electrons are in a double bond?
4
The formula for sodium sulfide is
Na2S
The electron configuration of a cobalt(III) ion is
[Ar]3d6
Using the VSEPR model, predict the molecular geometry around the central atom in SO32-.
trigonal pyramidal
In what groups are transition metals located?
3 through 12
What is the formula for the ionic compound formed by calcium ions and nitrate ions?
Ca(NO3)2
The chemical name for ClO3- is "chlorate ion". What is the common name for HClO3?
Chloric acid
The elements in a column of the periodic table are known as
Group
Thiocarbonyl disulfide (CSF2), based on the coordinate axes provided below, in which direction does the net molecular dipole moment point for the molecule?
It points in the -y direction
Which of these elements has the smallest first ionization energy?
K
A molecule with the formula AB4 and a tetrahedral molecular geometry uses _________ to form its σ bonds.
sp3 hybrid orbitals
"No two electrons in an atom can have the same four quantum numbers" is a statement of
the Pauli exclusion principle
How many electrons are in the 4p orbitals of vanadium?
0
What formal charge resides on the carbon of CO32-?
0
What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO2?
0
What is the number of lone electron pairs on the central atom of a molecule having a seesaw molecular geometry, such as SF4?
1
What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal molecular geometry, such as NH3?
1
The total number of lone pairs in NCl3 is
10
An element with the general electron configuration for its outermost electrons of ns2np1 would be in which element group?
13
In what group of the periodic table is the element with the electron configuration [Ar]4s23d104p3?
15
A sulfide ion, S2-, has
16 protons and 18 electrons
How many total electrons are present in chloride ion?
18
What is the electron configuration for bromine?
1s22s22p63s23p64s23d104p5
What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?
246 kJ
The Pauli exclusion principle states that no ____ electrons within an atom can have the same ____ quantum numbers.
2; 4
What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as ClF2-?
3
The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s), ____ double bond(s), and ____ lone pair(s).
3, 0, 10
What is the total number of electron domains around the central atom for a molecule having a trigonal pyramidal molecular geometry, such as NH3?
4
What is the wavelength of radiation that has a frequency of 6.912 × 1014 s-1?
4.337 × 102 nm
How many single bonds are bonded to sulfur in SF6?
6
How many dots does the Lewis dot symbol for chlorine have around it?
7
How many orbitals are allowed in a subshell if the angular momentum quantum number for electrons in that subshell is 3?
7
How many dots does the Lewis dot symbol for argon have around it?
8
How many lone pairs of electrons need to be added to complete this Lewis structure? O H || | H-O-C-C-N-H | | Cl H
8
The total number of bonding electrons in a molecule of formaldehyde (H2CO) is
8
What is the average mass, in grams, of one atom of iron?
9.27 × 10-23 g
Which one of the following sets of quantum numbers is not possible? n l ml ms A 4 3 -2 +1/2 B 3 0 1 -1/2 C 3 0 0 +1/2 D 2 1 1 -1/2 E 2 0 0 +1/2
B
Which of these compounds is most likely to be ionic?
BaCl2
For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?
BeCl2; sp2
What is the predicted molecular geometry of the H2O molecule according to the VSEPR model?
Bent
Which of the following is a nonmetal?
Bromine, Br, Z = 35
A possible set of quantum numbers for the last electron added to complete an atom of gallium (Ga) in its ground state is n l ml ms A 4 0 0 -1/2 B 3 1 0 -1/2 C 4 1 0 +1/2 D 3 1 0 +1/2 E 4 2 0 +1/2
C
A possible set of quantum numbers for the last electron added to complete an atom of germanium in its ground state is n l ml ms A 4 0 0 +1/2 B 3 0 +1 -1/2 C 4 1 -1 +1/2 D 3 1 +1 -1/2 E 4 2 +2 -1/2
C
Which of these elements is chemically similar to potassium?
Cesium
What type of configuration specifies the arrangement of electrons in the orbitals of an atom?
Electron configuration
What is the molecular geometry of the thiocyanate anion, SCN-, as predicted by the VSEPR model? (Carbon is the central atom.)
Linear
Hund's rule states that the most stable arrangement of electrons in orbitals of equal energy is the one in which the number of electrons with parallel spin is ______________.
Maximized
The formula for magnesium sulfate is
MgSO4
The electronic structure 1s22s22p63s23p64s23d8 refers to the ground state of
Ni
Which one of these elements is a transition element?
Nickel
Which element in Group 16 has the highest electron affinity?
O
Arrange P, S, and O in order of increasing atomic radius.
O < S < P
Which of the following atoms can expand its valence shell when bonding?
P
Which of these atoms has the smallest radius?
P
According to the VSEPR model, which molecule is predicted to have a molecular geometry that is trigonal bipyramidal?
PF5
Which of the following elements is the most electronegative?
S
In which one of the following structures does the central atom have a formal charge of +2?
SO42-
Which of these ground-state ions has unpaired electrons?
Sc2+
Which has a dipole moment of zero?
SeO3
Which element has the following ground-state electron configuration? [Kr]5s24d105p2
Sn
The hybridization of the central nitrogen atom in the molecule N2O is
Sp
Which of these elements is the least electronegative?
Sr
What is the predicted molecular geometry of the IBr3 molecule according to the VSEPR model?
T-shaped
What is the molecular geometry of ClO3F as predicted by the VSEPR model? :O: ** || ** O = CL - F : ** || ** :O:
Tetrahedral
What is wrong with this Lewis structure? H | ** :C- Cl: | ** :O:
The O atom does not have an octet.
Which is true concerning the dipole moment of a CO2 molecule?
The dipole moment is zero because the molecule is linear.
According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is
Trigonal pyramidal
Elements with the highest first ionization energies are found in the ___________ region of the periodic table.
Upper right
In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?
XeO3
The electron configuration of a ground-state vanadium atom is
[Ar]4s23d3
An isoelectronic series is
a series that has two or more species that have identical electron configurations, but different nuclear charges
What is the name of ClO - ion?
hypochlorite
The percent ionic character of a bond _________ electronegativity of the bonding atoms ___________.
increases as the difference in; increases
Which of the following is a correct set of quantum numbers for an electron in a 3d orbital?
n = 3, l = 2, ml = -2
Which of the following is a correct set of quantum numbers for an electron in a 5f orbital?
n = 5, l = 3, ml = +1
Which of these choices is the general electron configuration for the outermost electrons of elements in the alkaline earth group?
ns2
The PCl5 molecule has
polar bonds, but is a nonpolar molecule
The orientation in space of an atomic orbital is associated with
the magnetic quantum number (ml).
