Chem 101- Exams 1, 2, and 3
Compound: CO_2 (Central C) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX3 b. AX2E1 c. AE2 d. AX3E1 e. AX2 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. bent c. linear d. trigonal planar e. t-shape 6. What is the O-C-O bond angle? a. 180 b. 90 c. 120 d. 109 e. <90
1. a 2. a 3. e 4. b 5. c 6. a
Compound: O_3 (central O) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX2 b. AX2E2 c. AX2E1 d. AX3 e. AX3E1 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. square pyramidal c. trigonal bipyramidal d. bent e. t-shaped 6. What is the O-O-O bond angle? a. 180 b. 90 c. <120 d. <109 e. <90
1. b 2. a 3. c 4. b 5. d 6. c
Ethanol (CH_3CH_2OH) can be synthesized by the following reaction: 2CO(g) + 3H_2(g) -> CH_3CH_2OH(g) + 1/2O_2(g) What volume in liters of oxygen gas, measured at 325 K and at a pressure of 1.03atm is produced upon the synthesis of 23g of ethanol? a. 3.25L b. 6.5L c. 12L d. 65L e. No O_2 is produced
b. 6.5L
What is the wavelength of the nhi=4-> nlo=1 emission transition (Lyman series) for hydrogen a. 45.6 nm b. 97.3 nm c. 226.3 nm d. 415.5 nm e. 656.2 nm
b. 97.3 nm
Consider radiation with the following wavelengths: I. 600nm II. 200nm III. 1200nm Arrange by: Highest energy, Lowest frequency, Lowest energy a. I, I, II b. II, III, III c. III, II, II d. III,II,III e. II, I, I
b. II, III, III
Which of the following has the highest ionization energy? a. Na b. Mg c. K d. Ca
b. Mg
Which molecule has a permanent dipole? a. BF_3 b. SO_2 c. CO_2 d. CCl_4 e. none of the above
b. SO_2
Which of these isoelectronic species has the smallest radius? a. Br^- b. Sr^2+ c. Rb^+ d. Se^2-
b. Sr^2+
Which of the subshells below do not exist due to the constraints upon the l quantum number? a. 2s b. 2p c. 2d d. all of the above e. none of the above
c. 2d
An electron cannot have the quantum numbers n=_____, l=_____, ml=____ a. 1,0,0 b. 3,2,1 c. 6,1,2 d. 3,2,-2 e. 3,2,-2
c. 6,1,2
Which of the following transitions represents an ABSORPTION of energy? a. 2d->4s b. 5p->3d c. 6s->6p d. 2p->2s
c. 6s->6p
Based solely on their location on the periodic table and the predicted trends, rank the following atoms in ionization energy, from smallest to largest: N, Bi, As, Pb a. N<Bi<As<Pb b. Pb<Bi<As<N c. N<As<Bi<Pb d. Bi<Pb<As<N e. As<Pb<Bi<N
c. N<As<Bi<Pb
For which of the following molecules and ions does nitrogen has etc sp^3 hybridization: NO_3^1-, N_2, NHCl_2 a. NO_3^1- b. N_2 c. NHCl_2 d. N_2 and NHCl_2 e. NO_3^1- and NHCl_2
c. NHCl_2
The species that contains 24 protons, 26 neutrons and 22 electrons would be represented by the symbol: a. ^50V^3+ b. ^26Cr^2+ c. ^50Cr^2+ d. ^50Mn^2+ e. none of these
c. ^50Cr^2+
In the Bohr model of the atom, a. electron paths are controlled by probability b. electrons are described as waves in orbitals c. electron energies are quantized d. electrons can have any energy e. both b and d
c. electron energies are quantized
Which of the following terms accurately describes the energy associated with the process: Li(g) -> Li^+(g) + e^- a. electron affinity b. binding energy c. ionization energy d. electronegativity e. none of these
c. ionization energy
A phase of Molybdenum (Mo) has a primitive cubic structure. What is the mass of the atoms in a single unit cell of this material? a. 1.156e26 b. 3.186e-22 c. 6.186e-22 d. 1.593e-22 e. 5.778e25
d. 1.593e-22
What is the wavelength of the nhi=3 nlo=2 emission transition in the Balmer series for hydrogen? a. 211nm b. 459nm c. 599nm d. 656nm e. 811nm
d. 656nm
Which of the following atoms is/are likely to form compounds with the formula NCl_2 (M=cation, Cl=chloride anion) I.Li II.S III.Mg IV.Al a. I b. I&III c. II&III d. III e. none of these above
d. III
Which of the following atoms is the LEAST electronegative? a. _9F b. _16S c. _33As d. _50Sn
d. _50Sn
Which statement is wrong? a. The atomic weight of carbon is about 12 b. the most stable ion of lithium is Li^+ c. The radius of a sodium atom is larger than that of a sodium cation d. a phosphorus atom is larger than an antimony atom e. oxygen has a smaller electron affinity than fluorine
d. a phosphorus atom is larger than an antimony atom
Choose the reactions that favor only products at equilibrium a. PbO_2(s) + 2H_2(g) <-> Pb(s) + H_2O(g) Keq=8.12 b. Cl_2(g) <-> 2Cl(g) Keq=2.2e-15 c. Cu^1+(aq) + 2NH_3(aq) <-> [Cu(NH_3)_2]^1+(aq) Keq=1.1e7 d. both a and c e. all three
d. both a and c
Which transition in a hydrogen atom would absorb the photon of greatest frequency? a. n=6 to n=2 b. n=3 to n=1 c. n=2 to n=9 d. n=1 to n=4 e. n=35 to n=2
d. n=1 to n=4
Compound: PO_4^3- (central P) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX4E3 b. AX4E1 c. AX4E2 d. AX3E1 e. AX4 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. square pyramidal c. tetrahedral d. trigonal planar e. t-shaped 6. What is the O-P-O bond angle? a. 180 b. 90 c. 120 d. 109 e. <90 7 What is the hybridization of PO_4^3-? a. sp b. sp^2 c. sp^3 d. sp^3d e. sp^3d^2
1. c 2. c 3. e 4. c 5. c 6. b 7. c
Compound: SeFCl_2^- (central Se) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX3E2 b. AX3 c. AX4E1 d. AX3E2 e. AX3E1 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. t-shape c. square pyramidal d. tetrahedral e. trigonal planar 6. What is the Cl-Se-Cl bond angle? a. <180 b. <90 c. <120 d. 109 e. 90
1. d 2. b 3. a 4. c 5. b 6. b
Compound: CO_2 (central C) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX3E2 b. AX3 c. AX4E1 d. AX3E2 e. AX2 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. square pyramidal c. linear d. trigonal planar e.tetrahedra 6. What is the Cl-Se-Cl bond angle? a. 180 b. <90 c. <120 d. 109 e. 90
1.a 2.a 3.e 4.b 5.c 6.a
Compound: O_3 (Central O) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX3E2 b. AX3 c. AX2E1 d. AX3E2 e. AX3E1 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. square pyramidalt-shape c. tetrahedral d.bent e. trigonal planar 6. What is the O-O-O bond angle? a. <180 b. <90 c. <120 d. 109 e. 90
1.b 2.a 3.c 4.b 5.d 6.c
Compound: SeFCl_2^- (central Se) 1. What is the steric number? a. 2 b. 3 c. 4 d. 5 e. 6 2. What is the coordination number? a. 2 b. 3 c. 4 d. 5 e. 6 3. Whate is the AXmEn configuration? a. AX3E2 b. AX3 c. AX4E1 d. AX3E2 e. AX3E1 4. How many electrons are around the central atom? a. 6 b. 8 c. 10 d. 12 e. 14 5. What is the molecular shape> a. square planar b. square pyramidalt-shape c.tetrahedral d. e. trigonal planar 6. What is the Cl-Se-Cl bond angle? a. <180 b. <90 c. <120 d. 109 e. 90
1.d 2.b 3.a 4.c 5.e 6.b
Consider the equilibrium reaction below and choose the correct statement(s): 2NO_2(g) <-> N_2O_4(g) deltaH=-57.1 brown colorless 1. the reaction mix will become more colorless as more NO_2 is added 2. the reaction mix will become more brown as the reaction is cooled 3. the reaction mix will become less brown as more N_2O_4 is added a. 1 b. 1 and 2 c. 2 and 3 d. 1 and 3 e. 1, 2 and 3
a. 1
In which orbital does an electron in a phosphorus atom experience the greatest effective nuclear charge a. 1s b. 2s c. 2p d. 3s e. 3p
a. 1s
Reading from top to bottom down any period in the periodic table, the ionic radii _____, the ionization energy ____, and the electronegativity ____. a. I, D, D b. D, D, I c. I, D, I d. D, I, D e. D, I, I
a. I, D, D
Which of the following molecules ro ions have multiple resonance structures: Hypochlorite (ClO^-), N_2O (central N), COF_2 (central C) a. N_2O only b. COF_2 only c hypochlorite only d. N_2O and COF_2 e. N_2O and hypochlorite
a. N_2O only
Which of the following elements has the largest atomic radius? a. Rb b. Na c. Li d. F e. I
a. Rb
Which of these isoelectronic species has the largest radius? a. Se^2- b. Br- c. Sr^2+ d. Rb^+ e. they are all the same size because they have the same number of electrons.
a. Se^2-
Which of the following has 8 protons, 10 neutrons, and 10 electrons? a. ^18O^-2 b. ^19K c. ^18F^-2 d. _8O^-2 e. _8F^-2
a. ^18O^-2
Which of the following atoms has the highest electron affinity? a. _9F b. _16S c. _33As d. _50Sn
a. _9F
Where in the periodic table could you find atoms with similar properties a. within the same group b. within the same block c. within the same period d. all of the above e. atoms are not arranged according to properties
a. within the same group
What is the energy of a photon with a wavelength of 566 nm? a. 6.62e-34 b. 3.51e-19 c. 9.36e-12 d. 2.11e5 e. cannot be determined
b. 3.51e-19
The photoelectric effect is _________. a. a relativistic effect b. the darkening of photographic film when exposed to an electric field c. the production of current by silicon solar cells when exposed to sunlight d. the ejection of electrons by a metal when struck with light of sufficient energy e. the total reflection of light by metals giving them their typical luster
d. the ejection of electrons by a metal when struck with light of sufficient energy
Consider ^85Kr and ^87Kr and choose the correct statement(s) below: 1. the two species above are isotopes each with a different number of protons 2. the two species above are isotopes each with a different number of neurons 3. the two species above are isotopes each with a different mass number a. 1 b. 2 c. 3 d. 1 and 2 e. 2 and 3
e. 2 and 3
Which of the following pairs are isotopes of the same element? 1. ^10B and ^11B^3- 2. ^12C and ^13C 3. ^32S and ^34S a. 1 b. 2 c. 3 d. 1 and 2 e. 2 and 3
e. 2 and 3
An electron cannot have the quantum numbers n=_____, l=_____, ml=____ a. 1,0,0 b. 3,2,1 c. 6,1,0 d. 3,2,-2 e. 3,2,3
e. 3,2,3
In which orbital does an electron in a phosphorus atom experience the least effective nuclear charge? a. 1s b. 2s c. 2p d. 3s e. 3p
e. 3p
Which of the following transitions represents an emission of energy? a. 3d->4s b. 6s->6p c. 4p->4d d. 3p->3d e. 5p->3d
e. 5p->3d
What is the oxidation number of manganese (Mn) in Ca(MnO_4)_2? a. 3+ b. 4+ c. 5+ d. 7- e. 7+
e. 7+
Consider PbI_2(s) dissolving in water. Calculate Ksp if the max solubility is 0.0013M a. 1 b. 0.0013 c. 1.69e-6 d. 2.20e-9 e. 8.79e-9
e. 8.79e-9
Which of the following elements has the greatest attraction for electrons in a molecule? a. Ge b. As c. Se d. Bi e. Br
e. Br
Reading from left to right across any period in the periodic table, the ionic radii _____, the ionization energy ____, and the electronegativity ____. a. I, D, D b. D, D, I c. I, D, I d. D, I, D e. D, I, I
e. D, I, I
Based solely on their location on the periodic table and the predicted trends, rank the following atoms in ionization energy, from smallest to largest: C, Al, In, F a. F<C<Al<In b. F<C<In<Al c. In<Al<F<C d. Al<In<C<F e. In<Al<C<F
e. In<Al<C<F
Which element has the lowest first ionization energy a. He b. Ne c. Ar d. Kr e. Xe
e. Xe
Which of the following statements is correct: a. CCl_4(g) effuses slower than CO_2(g) b. NH_3(g) effuses faster than CO_2(g) c. CO_2(g) effuses at about the same rate as propane gas(C_3H_8(g)) d. both a and b e. a, b and c
e. a, b and c
Which of the following will increase the rate of a reverse reaction? a. increase in concentration of reactants b. increase in temperature c. addition of a catalyst d. a and b e. b and c
e. b and c
Compare the following elements described by their electron configurations: I. [Kr] 5s^2 4d^4 II. [Ar] 4s^2 3d^10 4p^4 a. I & II are transition metals b. I & II have four unpaired electrons in their highest energy orbitals c. I is the more likely to form a cation d. II has a higher ionization potential than I e. both c and d are correct
e. both c and d are correct
Higher energy electrons are CLOSER/ FURTHER to the nucleus and therefore are EASIER/HARDER to remove and therefore represent a HIGHER/LOWER electronegativity of the atom. a. closer, easier, lower b. closer, harder, higher c. further, harder, higher d. closer, harder, lower e. further, easier, lower
e. further, easier, lower
Which of the following quantum numbers is/are the primary indicator(s) for the energy of an electron in a subshell of a multi-electron system? a. ml b. n c. l d. a and ml e. n and l
e. n and l
The following SPONTANEOUS reaction is responsible for the cooling action of a cold pack: Ba(OH)_2 X 10H_2O(s) + 2NH_4SCN(s) -> Ba(SCN)_2(s) + 2NH_3(g) + 10H_2O (l) What is the sign of deltaG for the reaction above? Is the reaction exothermic or endothermic Which term is favorable, deltaS or deltaH? a. positive, exothermic, deltaS b. positive, endothermic, deltaH c. negative, exothermic, deltaS d. negative, endothermic, deltaH e. negative, endothermic, deltaS
e. negative, endothermic, deltaS
What is the electron configuration of Cr^4+ (ele 24) a. [Ar] 4s^2 3d^4 b. [Ar] 3d^4 c. [Ar] 4s^2 3d^0 d. [Ar]4d^2 e. none of the above
e. none of the above
Which of the subshells below do not exist due to the constraints upon the l quantum number? a. 4f b. 4p c. 4d d. 4s e. none of the above
e. none of the above
The de Brogile wavelength of a ______ will have the shortest wavelength when traveling at 30 cm/s. a. car b. marble c. hydrogen atom d. uranium atom e. planet
e. planet
Pauli Exclusion Principle
no two electrons in an atom can have the same set of quantum numbers. ^^