Chem Exam 2
Which is the most acceptable electron dot structure for N2H2?
.. .. H - N = N - H
What are the possible values of l if n=5?
0, 1, 2, 3, or 4
How many lone pairs of electrons are on the Xe atom in XeF6?
1
In the lewis dot formula that minimizes formal charge, how many lone pairs are around the central atom in the chlorate ion, ClO3^-?
1
how many lone pairs of electrons are on the P atom in PF3?
1
what is the maximum number of electrons that could occupy any d subshell?
10
How many electrons are in the valence shell of an I in IF4-?
12
What is the maximum number of electrons that could occupy the n=3 shell?
18
how many electrons are in the outermost shell of the ln3+ ion in its ground state?
18
how many electrons in the ion P3-
18
Write the complete electron configuration for a neutral phosphorus atom. What are the core and valence electrons?
1s2 2s2 2p6 3s2 3p3 core............. valence.
Write the complete electron configuration for a neutral chromium atom. What are the core and valence electrons?
1s2 2s2 2p6 3s2 3p6 4s1 3d5 core................................ Valence.
Write a complete electron configuration for a neutral nickel atom. What are the core and valence electrons?
1s2 2s2 2p6 3s2 3p6 4s2 3d8 core................................. Valence.
how many electrons can a single orbital hold?
2
what is the maximum number of electrons in an orbital?
2
how many electrons are in the ion Zn2+
28
the nitrogen-nitrogen bond in N(triple bond)N: has a bond order of
3
Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table periods
3 through 7
The element In has how many valence electrons?
3 valence electrons because 4d10 acts as a pseudo noble gas and its a filled subshell so since the 4th is inner compared to the 5th shell the 5s2 and 5p1 are the valence electrons
What is the most likely charge on an ion of phosphorus?
3-
An electron in a 4p orbital can have a wave function with which of the following set of quantum numbers, (n, l, m(l), m(s))?
4, 1, -1, -1/2
how many subshells are there in the shell with n=6?
6
write arrows indicating in which directions atomic radii become larger
<------------- I I I v
Give the formula for bromate ion
BrO3^-
In the most acceptable electron-dot structure for carbonyl fluoride, COF2, the central atom is
C, which is double bonded to O
The chemical formula for calcium nitride is
Ca3N2
Write the formula for calcium nitride
Ca3N2
Give the formula for calcium sulfate
CaSO4
Write the name for Ca3(PO4)2
Calcium Phosphate
Which of the following contains an atom that does not obey the octet rule? KBr, CO2, ClF3, ICl
ClF3
The compound, Cu(ClO3)2 is named
Copper (II) Chlorate
Consider Li+, F-, and O2-. Which ratio should be the largest? A) (radius Li+)/(Radius F-) B) (radius Li+)/(radius O2-) C) (radius F-)/(radius O2-) D) (Radius O2-)/(radius Li+)
D) (Radius O2-)/(radius Li+) less protons pulls less hard on electrons making radius larger
Give the formula for iron (III) carbonate
Fe2(CO3)3
which atom is larger, Ge or Cl?
Ge
Which molecule contains a triple bond? F2, O3, HCN, H2CO
HCN
Which atom in each group (I and II) has the smallest atomic radius? (I) Sr, Zr, I (II) N, P, As
I;N
Why can't n=3, l=3, m(l)=0 be a set of quantum numbers?
If n=3, l can't =3 because l is integral values from 0 to n-1 and 3-1=2 so it can't be higher than 2
Write the formula for potassium perchlorate
KCLO4
Give the formula for lithium nitride
Li3N
Which of the following ionic compounds would be expected to have the highest lattice energy? RbCl, NaCl, KCl, LiCl
LiCl
Li2S is named
Lithium Sulfide
Write the name for Mg(OH)2
Magnesium Hydroxide
Give the name for Mn(OH)2
Manganese (II) Hydroxide
The correct name for Mn(CH3CO2) is
Manganese (IV) Acetate
what is the identity of element Q if the ion Q2+ contains 10 electrons?
Mg
Write the formula for Nitride ion
N3-
Write the formula for sodium chloride
NaCl
which chemical process is associated with the lattice energy for sodium chloride?
NaCl(s) --> Na+(g) + Cl-(g)
List the elements Cs, Ca, Na, Ar in order of decreasing first ionization energy
Ne>Ar>Ca>Na>Cs
List the elements Cs, Ca, Ne, Na, Ar in order of decreasing first ionization energy
Ne>Ar>Ca>Na>Cs
Write the name for NO3-
Nitrate
the compound NO2 is named
Nitrogen dioxide
Which elements commonly form anions?
Nonmetals
which element can accommodate more than eight electrons in its valence shell? C, O, P, He
P
Give the formula for phosphide ion
P^3-
The ions ClO4-, ClO3-, ClO2-, and ClO- are named respectively
Perchlorate, chlorate, chlorite, hypochlorite
Give the name for PO4^3-
Phosphate
The octet rule is most likely to fail occasionally for which of the following elements? C, Na, N, S
S
Which of these elements has the most favorable (most negative) electron affinity? Ca, N, Ne, S
S
The thiosulfate ion is
S2O3^2-
The chemical formula for the sulfite ion is
SO3^2-
Which element can form more than one kind of monatomic ion? Se, Sn, S, Sr
Sn -4 +4
What is the chemical formula for strontium hydroxide?
Sr(OH)2
What is the chemical formula for strontium hydride?
SrH2
Write the condensed (noble gas abbreviation) electron configuration for a Cr atom. What are the core and valence electrons?
[Ar] 4s1 3d5 core. valence.
what is the ground state electron configuration of Se2-?`
[Ar] 4s2 3d10 4p6
Write the condensed (noble gas abbreviation) electron configuration for a Ni atom? What are the core and valence electrons?
[Ar] 4s2 3d5 core. Valence.
Write the condensed (noble gas abbreviation) electron configuration for a In atom. What are the core and valence electrons?
[Kr] 5s2 4d10 5p1 core. V. core. Valence
Write the condensed (noble gas abbreviation) electron configuration for a P atom. What are the core and valence electrons?
[Ne] 3s2 3p3 core. valence.
What is the ground-state electron configuration of the ion H2+?
[Xe] 4f14 5d10
A::A represents
a double bond
for an orbital, a node is
a surface where there is no chance of finding the electron
in which of the following sets do all species have the same number of electrons (isoelectronic)? a) Br-, Kr, Sr2+ b) C, N3-, O2- c) Mg2+, Sr2+, Ba2+ d) O, O2-, O2+
a) Br-, Kr, Sr2+
Which liberates the most energy (that is has the most negative electron affinity)? a) F(g) + e- --> F-(g) b) N(g) " " c) O(g) " " d) C(g) " "
a) F(g) + e- --> F-(g)
which of the following ionic compounds would be expected to have the highest lattice energy? a) NaF b) NaCl c) NaBr d) NaI
a) NaF
which of the following three sets consist of atoms or ions with the sam electron configuration (isoelectronic) in the ground state? (I) O2-, Ne, Mg2+ (II) Ni, Cu+, Zn2+ (III) Hg, Ti+, Pb2+
all but (II)
Which Ionization process requires the most energy?
always there highest charge one i.e. P3+(g) --> P4+(g) + e-
Which two ions have the same electron configuration (isoelectronic) in the ground state? a) Rb+ and Cs+ b) Ba2+ and I- c) Se2+ and I- d) Fe2+ and Fe3+
b) Ba2+ and I-
the solid compound K2CO3 contains... a) K+, C4+, and O2- ions b) K+ ions and CO3^2- ions c)K2^+ and CO3^2- ions d) K2CO3 molecules
b) K+ ions and CO3^2- ions
which of the species below has 28 protons and 26 electrons? a) Fe2+ b) Ni2+ c) 54/26Fe d) 54/28Ni
b) Ni2+
All of the following statements about resonance are true except... a) A single e- dot structure does not provide an adequate representation of the bonding b) resonance describes the oscillation and vibration of electrons c) resonance describes a more stable situation than does any one contributing resonance structure d) resonance describes the bonding as intermediate between the contributing resonance structure e) the contributing resonance structure differ only in the arrangement of the electrons
b) resonance describes the oscillation and vibration of electrons
The concept of resonance describes molecular structures a) that have several different geometric arrangements b) that have no suitable single-electron dot structure c) that have electrons resonating d) that are formed from hybridized orbitals e) that have resonating structures
b) that have no suitable single-electron dot structure
What is the general trend in ionization energy and electron affinity values?
both increase as one traverses a period from left to right and both decrease as one descends a group
for a hydrogen atom, which electronic transition would result in the emission of a photon with the highest energy? a) 2s-->3p b) 3p--> 6d c) 4p--> 2s d) 5f--> 3d
c) 4p--> 2s
which ionic compound would be expected to have the highest lattice energy? a) Na2O b) MgO c) Al2O3 d) CO2
c) Al2O3
Which ion does not have the same e- configuration as a noble gas in its ground state? a) Se3+ b) Al3+ c) Ga3+ d) As3-
c) Ga3+
which element has the least favorable (least negative) electron affinity? a) B b) C c) N d) O
c) N
of the following, which element has the highest first ionization energy? a) aluminum b) magnesium c) silicon d) sodium
c) silicon
which orbitals have two nodal planes passing through the nucleus?
d
Draw the correct electron-dot structures. Which of the following exhibits resonance? a) CH4 b) PCl5 c) H2O d) NO2^- e) at least two of them
d) NO2^-
in which of the following sets do all species have the same number of protons? a)Br-, Kr, Sr2+ b) C, N3-, O2- c) Mg2+, Sr2+, Ba2+ d) O, O2-, O2+
d) O, O2-, O2+
which of these elements has the most favorable (most negative) electron affinity? a) Ca b) N c) Ne d) S
d) S
which ion has the same e- configuration as Kr? a) Rb+ b) Br- c) Se2- d) all of the above
d) all of the above
Which of the following is true? a) the bohr atom is the model currently accepted for electrons in atoms b) electrons travel around the nucleus in circular orbits c) there is a 5% chance of finding an electron in an atom outside its orbital d) the square of the wave function gives the probability of finding the electron within a given region of space around the nucleus
d) the square of the wave function gives the probability of finding the electron within a given region of space around the nucleus
In the lewis dot formula for bromate ion (BrO3^-) that minimizes formal charge, the central atom is surrounded by...
five bonding pairs and one lone pair of electrons
The definitive distinction between ionic bonding and covalent bonding is that
ionic bonding involves a transfer of electrons and covalent bonding involves a sharing of electrons
For principal quantum number n=5, list the possible values of l and m(l)
l= 0, 1, 2, 3, 4 m(l)= 0 -1, 0, 1 -2, -1, 0, 1, 2 -3, -2, -1, 0, 1, 2, 3, -4, -3, -2, -1, 0, 1, 2, 3, 4
A reactive element with a relatively high electronegativity would be expected to have a relatively
large negative electron affinity and a relatively high ionization energy
For an electron in a given atom, the larger n, the
larger the average distance from the nucleus and the higher the orbital energy
the number or orbitals in a given subshell, such as the 5d subshell, is determined by the number of possible values of
m(l)
Which elements commonly form cations?
metals
How do these values relate to orbitals?
n is what determines the number in orbital notation and l determines the letter in orbital notation so l=0 is s, l=1 is p, etc. So n=2 and l=0 is 2s orbital. m(l) determines the number of orbitals in the subshell by the amount of m(l) values possible
what are the possible values of n and m(l) for an electron in a 5d orbital?
n= 5 and m(l)= -2, -1, 0, 1, or 2
which elements commonly form covalent bonds?
nonmetals
which orbitals do not have a node at the nucleus?
s
the subshell designations follow the alphabet after f. What is the first shell in which an h orbital would be allowed?
sixth
A coordinate covalent bond may be formed when
the central atom donates both electrons in forming a single bond
What is the definition of lattice energy?
the energy required to separate an ionic solid into gaseous ions
