CEM 151 final exam 2018

How many unpaired electrons are there in the following metal complexes (assume either tetrahedral or octahedral geometry)? VOCl3 A. 0 B. 1 C. 2 D. 3 E. 4 F. 5 G. 6 H. 7 I. 8 J. 9

A. 0

Which of the following contains the largest total number of moles of atoms? A. 2 moles of sodium bicarbonate B. 4 moles of sodium chloride C. 3 moles of carbon dioxide D. 6 moles of argon gas E. 3 moles of sodium hypochlorite

A. 2 moles of sodium bicarbonate

All of the following complexes are colored. Which is definitely colored due to a charge transfer process? A. [Sc(H2O)6]^3+ B. [Au(NH3)4]^3+ C. [Cr(NH3)5Cl]^2+ D. [Co(NH3)6]^2+ E. [Ni(NH3)6]^2+ F. [NiF6]^2+

A. [Sc(H2O)6]^3+

A metal complex that absorbs light at 520 nm (in the green range) will appear A. red B. green C. yellow D. orange E. blue F. violet G. colorless H. black I. white

A. red

What is the oxidation state of the metal in the complex [TiCl2(NH3)4Cl]? A. +1 B. +2 C. +3 D. +4 E. +5 F. +6 G. -1 H. -2 I. -3 J. none of the above

C. +3

A speaker is vibrating at a regular frequency of 600. Hz (s^-1). What is the wavelength of the waves produced (the speed of sound is 344 m/s) A. 0.241 m B. 0.344 m C. 0.573 m D. 0.600 m E. 1.74 m F. 250 m G. none of the above

C. 0.573 m

Of the choices below, which gives the order (from largest (most positive) to smallest (least positive or most negative) for first ionization energies? A. Pb, Sn, Ge, As, Br B. Sn, Pb, As, Ge, Br C. Br, As, Ge, Sn, Pb D. Br, As, Pb, Ge, Sn E. Pb, Sn, Br, As, Ge F. As, Sn, Br, Pb, Ge

C. Br, As, Ge, Sn, Pb

Which of the following is sulfurous acid? A. H2SO4 B. HSO4 C. H2SO3 D. HSO3 E. H2SO2 F. HSO2 G. none of the above

C. H2SO3

Sodium chloride reacts with potassium metal to produce potassium chloride and sodium, but will not react with aluminum metal to produce aluminum chloride and sodium. Put the three elements in their proper order in the activity series (in order of highest to lowest oxidation potential). A. Na, K, Al B. Al, K, Na C. K, Na, Al D. Al, Na, K E. K, Al, Na F. Na, Al, K

C. K, Na, Al

Which of the following is most likely to be diamagnetic? A. [CoCl2(NH3)4] B. [FeF6]^3- C. [Co(CN)6]^3- D. [CoF6]^3- E. [Cr(H2O)6]^3+ F. tetrahedral [Fe(CN)4]^2-

C. [Co(CN)6]^3-

An example of the direct application of the photoelectric effect is A. semiconductors B. wind energy C. a solar cell D. robotics E. the internal combustion energy F. a fuel cell G. the electric car H. all of the above:

C. a solar cell

Aluminum reacts with a certain nonmetallic element to form a compound with the general formula AlX3. Element X is a diatomic gas at room temperature. X is in which group of the periodic table? A. alkali metal B. alkaline earth metal C. halogen D. transition metal E. nonmetal F. chalcogen G. noble gas H. lanthanide I. actinide

C. halogen

Predict the geometry of Pt(en)2Br2 given that it's paramagnetic? A. linear B. trigonal planar C. tetrahedral D. octahedral E. square planar F. trigonal bipyramidal

C. tetrahedral or D. octahedral

J.J. Thompson used his cathode ray tube, a phosphorescent screen, a magnet and an electric field to discover? A. the charge of the electron B. the mass of the electron C. the charge to mass ratio of the electron D. the charge of the proton E. the mass of the proton F. the charge to mass ratio of the proton G. the discovery of the nucleus H. none of the above

C. the charge to mass ratio of the electron

Carbonate ion?

CO3^2-

How many electrons in ^54Fe^2+? A. 54 B. 26 C. 28 D. 24 E. 56 F. 52

D. 24

Choose the correct set of four quantum numbers in the order n (principal), l (azimuthal), m (magnetic), s (spin) A. 2, 1, -2, 1/2 B. 3, 3, -2, 1/2 C. 1, 0, -1, -1/2 D. 3, 2, 2, -1/2 E. 0, 0, 0, 1/2 F. 2, -1, 0, ½

D. 3, 2, 2, -1/2

Indicate the coordination number of the metal and the oxidation number of the metal for Na[Mo(NH3)3(CN)3] (coordination number, oxidation number) A. 6, +6 B. 6, +4 C. 6, +3 D. 6, +2 E. 4, +4 F. 4, +3 G. 4, +2 H. 2, +4 I. 2, +3 J. 2, +2

D. 6, +2

The speed of the sound at sea level is 343m/s. Express the speed of sound in miles per hour. A. 1990 mph B. 7.67*10^8 mph C. 7.67*10^5 mph D. 767 mph E. 394 mph F. 456 mph G. none of the above

D. 767 mph

Instant ice packs are made by dissolving ionic compounds in water (crushing the ice pack releases the water into the solid ionic compound.) Which of the following ionic compounds do you predict will give the most cooling per gram? Assume that all are completely soluble in water. A. LiF B. NaCl C. NaBr D. MgF2 E. CaBr2 F. CsI2 G. none of the above

D. MgF2

Which of the following are chemical properties? A. temperature B. density C. volume D. corrosiveness E. state (solid, liquid, gas) F. none of the above G. all of the above

D. corrosiveness

125. mL of a 0.80 M solution of sodium hydroxide is required to titrate 500. mL of a solution of hydrochloric acid. What was the concentration of hydrochloric acid? A. 0.25 M B. 0.80 M C. 1.0 M D. 0.050 M E. 0.20 M F. 0.40 M G. 0.10 M H. 0.50 M I. 0.0050 M

E. 0.20 M

How many unpaired electrons are there in the following metal complexes (assume either tetrahedral or octahedral geometry)? Na2[PdCl6] A. 0 B. 1 C. 2 D. 3 E. 4 F. 5 G. 6 H. 7 I. 8 J. 9

E. 4

How many unpaired electrons are there in the following metal complexes (assume either tetrahedral or octahedral geometry)? Sodium cobalt (II) tetrachloride A. 0 B. 1 C. 2 D. 3 E. 4 F. 5 G. 6 H. 7 I. 8 J. 9

E. 4

How many unpaired electrons are there in the following metal complexes (assume either tetrahedral or octahedral geometry)? [FeCl4]^2- A. 0 B. 1 C. 2 D. 3 E. 4 F. 5 G. 6 H. 7 I. 8 J. 9

E. 4

Of the following, which gives the correct order (from largest to smallest) for atomic radius for Sr, Ca, Cl, As, Se? A. Sr, Ca, Cl, As, Se B. Ca, Sr, As, Se, Cl C. As, Sr, Ca, Cl, Se D. Ca, Sr, Se, As, Cl E. Sr, Ca, As, Se, Cl F. Cl, Se, As, Ca, Sr

E. Sr, Ca, As, Se, Cl

The _________ quantum number is most responsible for defining the orientation of a n orbital. A. spin B. n C. Ψ D. ms E. magnetic F. azimuthal G. principle

E. magnetic

Which of the following are molecules? A. Nitrogen B. chlorine C. the phosphate ion D. MgCl2 E. sodium hydroxide F. nitrogen and chlorine G. nitrogen, chlorine, and the phosphate ion H. nitrogen and the phosphate ion I. none of the above J. all of the above

G. nitrogen, chlorine, and the phosphate ion

Electrons in the 2s subshell are closer to the nucleus in which of the following nuclei? A. He B. Xe C. Rb D. Co E. F F. Ni G. K H. Rn I. Cd J. H

H. Rn

Which one of the following is a metai? A. Ge B. S C. P D. H E. Se F. I G. Br H. Tl I. C J. none of the above

H. Tl

Between which of the following atoms would you predict a covalent bond to be formed? A. I and P B. F and F C. Na and I D. Na and Mg E. Zn and S F. Cl and C G. b and f H. a, b, and f I. a, d, and e J. none of the above

H. a, b, and f

Which of the following are strong electrolytes? A. acetic acid B. hydrochloric acid C. sodium chloride D. ammonium sulfate E. hydrofluoric acid F. all of the above G. all but a,b, and e H. all but a and e I. all but a, d, and e J. all but c and d

H. all but a and e

Calculate the energy of 1 mole of photons with a wavelength of 600 nm A. 600. J B. 600. kJ C. 3.31*10^-19 J D. 239 J E. 239 kJ F. 299J G. 299 kJ H. none of the above

H. none of the above

Which of the following types of electromagnetic radiation has the highest frequency? A. radio waves B. infrared radiation C. yellow light D. ultraviolet light E. visible light F. blue light G. microwaves H. x-rays

H. x-rays

Phosphate ion?

PO4^3-

Sulfite ion?

SO3^2-

Which of the following molecules are capable of hydrogen bonding? A. NH3 B. HF C. acetic acid D. C2H4 E. none of the above F. a and b G. a and c H. a and d I. all of the above J. a, b, and c

i

Which of the following would have to lose 3 electrons to obtain a noble gas configuration: Sr, Br, O, N, Al, Ca?

Al

Which of the following has five significant figures? A. 10.83400 B. 20,475,000 C. 20,475,000. D. 20.47500 E. a and b F. a, b, and c G. all of the above H. none of the above

B. 20,475,00

Which element in the following reaction gets reduced, and which gets oxidized (reduced, oxidized)? K2Cr2O7+4H2SO4+3K2SO3=Cr2(SO4)3+4K2SO4+4H2O A. Cr, K B. Cr, S C. O, H D. H, O E. K, Cr F. S, Cr G. Cr, H H. Cr, O I. S, H J. O, Cr

B. Cr, S

Which of the following is the correct electron configuration of a noble gas? A. [He] 2s^2 B. [Ar] 4s^2 3d^10 4p^6 C. [Kr] 4s^2 4d^10 4p^6 D. [Kr] 4s^2 3d^10 4p^6 E. [Ar] 4s^1 3d^5 4p^3 F. [Ne] 3s^2 3p^6 4s^2 G. [Kr] 4s^1 3d^5 4p^3 H. [Ar] 4s^2 4d^10 4p^6

B. [Ar] 4s^2 3d^10 4p^6

Which of the following are not homogeneous mixtures? A. the air in a balloon B. a tank of pure oxygen C. a solution of sodium chloride dissolved in water D. a glass of vodka (containing water and ethanol, which are completely miscible) E. none of the above F. all of the above

B. a tank of pure oxygen

Which of the following is an alkaline earth element? A. fluorine B. magnesium C. oxygen D. nitrogen E. lithium F. boron G. none of the above

B. magnesium

How many unpaired electrons are in manganese (Mn) atom? A. 0 B. 1 C. 2 D. 3 E. 4 F. 5 G. 6 H. none of the above

F. 5

Which of the following elements has the most negative electron affinity? A. Na B. Mg C. Al D. Si E. P F. F G. Cl H. Ar

F. F

Which of the following has the largest second ionization energy? A. Se B. I C. Ga D. Ca E. Ge F. Na G. Rb H. U I. Ru J. Mg

F. Na

Which of the following do you predict will be the most dense? A. neon gas B. solid sodium chloride C. molten sodium chloride D. liquid water E. ice F. liquid mercury

F. liquid mercury

Given the following reactions, determine the missing enthalpy of reaction. A+B=C (15kJ); B+F=G (?? kJ); C+E=G (-15kJ); A+E=F (-25kJ) A. 10 kJ B. -10 kJ C. 15 kJ D. -15 kJ E. 20 kJ F. -20 kJ G. 25 kJ H. -25 kJ I. 150 kJ J. -150 kJ

G. 25 kJ

How many electrons does it take to fill the fourth energy level (shell)? A. 2 B. 8 C. 14 D. 18 E. 24 F. 28 G. 32 H. none of the above

G. 32

Which of the following lists the elements in order of their electronegativity, from lowest to highest? A. Cl, O, F, N B. Na, Mg, Al, Si C. P, S, Cl, Br D. At, I, Br, Cl, F E. Si, C, N, O, F F. F, Cl, Br, I, At G. b, d, and e H. a, b, c, and e I. b, c, and d J. d and e

G. b, d, and e

Which of the following elements exclusively make +2 cations? A. fluorine B. sodium C. zinc D. copper E. magnesium F. e and d G. c and e H. none of the above

G. c and e

Which of the following elements have f electrons? A. Cs B. Fr C. Hf D. Sn E. Pb F. Pm G. c and f H. all but a and b I. all but a and d J. e and f

I. all but a and d

What is the electron configuration of vanadium?

[Ar]4s^2 3d^3