Exam 3 - Chemistry I
What is the ground-state electron configuration of copper(I) ion, Cu2+?
1s22s22p63s23p63d10
Which lewis dot formula for pyrophosphate, P2O7 4-, minimizes formal charge?
A
According to the building - up principle or aufbau principle, which subshell is typically filled next after the 3d sub shell?
A - 4p
what is the maximum number of electrons that can be accommodated in the N = 2 shell?
A - 8
which of the following orbital diagrams represents a diamagnetic atom?
A 1s (2) 2s (2)
which of the following atoms is paramagnetic in its ground state?
A : Tin (Sn)
What is the electron configuration for Mn3+?
A : [AR] 3D4
What is the wavelength of a photon that has an energy of 2.36 x10^-16 J?
0.843m
In the lewis dot formula for ICl2-, the number of lone pairs of electrons around the central iodine atom is
D: 3
Which of the following molecules is polar?
D: NO2
Which pair of elements would form a covalent bond that is the least polar?
D: O and F
which molecule is polar?
D: So2
What is the ground-state electron configuration of sulfur? (s)
D: [Ne] 3s23p4
The lewis formula for phosphine, PH3, has
D: three bonding pairs and one lone pair
What is the maximum number of electrons in an atom that have the set of quantum numbers n = 1 and I = 0?
E - 2
Which of the following orbital occupancy designations is incorrect?
E - 4f15
how many p oritibalms are in the n=4 shell?
E. 3
Which of the following sets of quantum numbers (n,l,m1,ms) refers to a 3d orbital?
E. 3 2 1 -1/2
Based on the photoelectric effect, Einstein proposed the idea that
E. Light has particle-like properties
Which of the following types of electromagnetic radiation has the highest frequency?
E. Ultraviolet
The lewis structure of a molecule has a high probability of violating the octet rule if 1. the molecule has an odd # of valence electrons 2. the central atom is surrounded by more than 4 atoms or 8 valence electrons 3. the central atom is from group 2A or 3A
E: 1, 2 and 3
In the lewis formula for difluorodiazine, N2F2, the total number of lone electron pairs around the two nitrogen atoms is
E: 2
The total number of valence electrons in the tetrathionate ion, S4O6 2- is
E: 62
the lewis formula of which species does NOT represent an exception to the octet rule?
E: CF3-
What set of ions are isoelectronic in their ground-state electron configurations?
E: N3-, O2-, Mg2+, Al3+
Which of the following species would be expected to have chemical properties most similar to those a nitrogen atom?
E: Phosphorus Atom
the molecular shape of ClF3 is
E: T-shape
Atoms of an element X have a ground state electron configuration 1s22s22p63s23p4. what type of ion is X most likely to form?
E: X^2-
Which of the following are two appropriate resonance formulas for the acetate ion, CH3CO2-?
A- Check image
What is the total number of orbitals found in the n = 4 shell?
A. 16
Which orbital or orbitals is/are specified by the set of quantum numbers n=4 and l=3?
A. 4f
How many orbitals have the set of quantum numbers n=4, and l=2?
A. 5
When an electron is an atom makes a transition from n = 6 to n = 4, which of the following statements is/are correct? I. Energy is emitted II. Energy is absorbed III. The electron loses energy IV. the electron gains energy V. The electron cannot make this transition
A. I and III
In which pair do both compounds exhibit predominantly iconic bonding?
A. RbCl and CaO
Which of the following statements is incorrect?
A. as the energy of a photon increases, its frequency decreases
How many unpaired electrons are found in the ground state electron configuration of selenium (Se)?
A: 2
The Cr2+ ion would be expected to have ____ unpaired electrons
A: 4
How many valance electrons does an arsenic atom have?
A: 5
In the I3- ion, how many electron groups surround the central atom?
A: 5
Which of the following is a correct lewis electron- dot formula for CO?
A: :C---O:
The following representation of an atom is called : Na-
A: A lewis dot structure
which of the following species represents an exception to the octet rule?
A: BF3
All of the following species have ground - state noble gas electron configurations except
A: Ge4+
which of the following molecules has an incorrect lewis formula
A: Sf
What hybrid orbitals of sulfur are involved in the bonding ion sulfur trioxide?
A: Sp2
All of the following ground-state electron configurations are correct EXCEPT
A: V[Ar] 4s^24d^3
What is the electron configuration of Mn^2+?
A: [Ar] 3d^5
Which of the following lewis dot structure for one formula unit of magnesium sulfide?
A: [Mg]2+ and [S] 2-
what noble gas core would be used when writing the ground state of an electron configuration for tungsten (w)?
A: [Xe]
A bond in which both electrons of the bond are donated by one atom is called ___
A: a coordinate covalent bond
In General, atomic radii ....
A: decrease from left to right in a period and increase down a group
The measure of the attraction that an atom has for the electrons in a chemical bond is called
A: electronegativity
A bond in which an electron pair is unequally shared by two atoms is
A: polar covalent
which of the following covalent molecules does NOT has the proper lewis dot formula?
B
What is the maximum number of electrons that can occupy one p oritbal?
B - 2
Which of the following subshells does not exist?
B 3f
What is the total number of valence electrons in the sulfite ion?
B : 26
Which of the following atoms is the most electronegative?
B : n
Which of the following combinations of quantum numbers is permissible?
B. n = 3, l=2, m1 = 1 and ms = 1/2
What is the H---O----H bond angle in water?
B: 104.5
Which of the labeled carbons (c1-c4) is/are sp3 - hybridized ?
B: C2 and C4
the molecular geometry of the ammonia ion, NH4+, ion is most similar to the molecular geometry of
B: CH4
an atom of which of the following elements has the smallest atomic radius?
B: I
Which of the following lewis formula is incorrect?
B: N N
Which molecule or ion is nonlinear?
B: NF2-
which of the following molecules is nonpolar?
B: PF5
An atom of which of the Following elements has the smallest ionization energy?:
B: Pb
which of the following statements is true?
B: The triple bond in N2 has a larger bond order and a smaller bond length than the single bond in F2
The conceptt of resonance describes molecular structures
B: that have delocalized bonding
What is the total number of electrons in p orbitals in a ground-state vanadium atom?
C- 12
what is the value of the principal quantum number for an electron in a 1s orbital?
C. 1
What is the frequency of a photon having a wavelength of 954.9 nm? ( c= 3.00 x 10^8 m/s)
C. 3.14 x 10^14 Hz
What is the value of the spin quantum number for an electron in a 3p orbital?
C. either +1/2 or -1/2
What is the ground-state electron configuration of tantalum (Ta)?
C: 1s22s22p63s23p63d105s24p64d104f145s25p65d36s2
What is the ground - state electron configuration of the sulfide ion?
C: 1s22s22sp63s23p6
which of the following statements is true?
C: A double bond consists of a pi bond and O bond
For which molecule or ion does the nitrogen Aton have the positive end of the dipole moment?
C: NO
What is the molecular shape of the ICl4- ion?
C: a square plane
which of the following statements best describes N2O?
C: the molecular geometry is linear and the molecule is polar
Fe has _____ that is (are) unpaired in its d orbitals
D : 4 electrons
which molecule or ion does not have a trigonal pyramidal molecular geometry?
D : BF3
Which of the following is/are trust about electromagnetic radiation? 1. wavelength is inversely proportional to frequency 2. frequency has units of S-1 or Hz. 3. Waves of different wavelengths travel at different speeds in a vacuum
D. 1 and 2
the approximate H---C----C bond angle in ethane C2H6 is
D: 109
How many valence electrons are present in the lewis formula of the hypochlorite ion, ClO-?
D: 14
Which of the following is the lewis dot structure for the rubidium ion?
[Rb]+
what is the wavelength of a photon having a frequency of 4.50x10^14 Hz? ( c = 3.00 x 10^8 m/s)
a. 6.67 x 10^-7 m
Which of the following is/are correct postulates of Bohr's Theory of the hydrogen atom? 1. the energy of an electron in an atom quantized (i.e. only specific energy values are possible) 2. the principal quantum number (n), specifies each unique energy level 3. an electron transition from a lower energy level to a higher energy level results in an emission of a photon of light
d. 1 & 2
Rank the following regions of the electromagnetic spectrum in order of decreasing frequency. X-rays, Microwaves, Infrared, Ultraviolet
x-rays, ultraviolet, infrared , microwaves
