Supplemental Instruction
IowaStateUniversity / Leader: / Ryan Gale
Course: / Chem 177
Instructor: / Miller/Bonaccorsi/Greenbowe
Date: / 10/21/12
1.)Which of the following are substances in their standard state?
a.)Li(l)b.) H(g)c.) CO2(g)d.) N2(g)
2.)Which of the followingreactions is used to calculate the standard enthalpy of formation?
a.)C3H8(g) → 3 C(s) + 4 H2(g)
b.)3 C(s) + 3 O2(g) → 3 CO2(g)
c.)4 H2(g) + 2 O2(g) → 4 H2O(g)
d.)Ni(s) + HCl(aq) → NiCl2(aq) + H2(g)
e.)H+(aq) + F-(aq) → HF(aq)
3.)The following reaction is known as the thermite reaction:
2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)
Using standard enthalpies of formation calculate ΔH° for this reaction.
ΔH°Fe2O3= -822.16 kJ/molΔH°Al2O3 = -1669.8 kJ/mol
a.)-847.6 kJb.) -1695.3 kJc.) 847.6 kJd.) -2492.0 kJ
4.)Milk enriched with Vitamin D has a serving of 1 cup. One serving of organic whole milk has 8g of fat, 12g of carbohydrates, and 8g of protein. Fat has a specific heat of 9 Cal/g, and protein and carbohydrates have a specific heat of 4 Cal/g. How many calories are in 1 cup of whole organic Vitamin D enriched milk?
a.)212 Calb.) 152 Cal c.) 172 Cald.) 196 Cal
5.)From the enthalpies of reaction
2C(s) + O2(g) → 2CO(g)ΔH = -221.0 kJ
2C(s) + O2(g) + 4H2(g) 2CH3OH(g)ΔH = -402.4 kJ
Calculate ΔH for the reaction
CO(g) + 2H2(g) → CH3OH(g)
a.)-90.7 kJb.) -181.4 kJc.) 181.4 kJd.) 19.8 kJ
6.)Label each of the following as true or false. If the statement is false, correct it.
a.)Visible light is a form of electromagnetic radiation.
b.)Ultraviolet light has longer wavelengths than visible light.
c.)X-rays travel faster than microwaves.
d.)Electromagnetic radiation and sound waves travel at the same speed.
7.)An argon laser emits light at 532 nm. What is the frequency of this radiation?
a.)5.64 x 10-5 Hz
b.)5.64 x 1014 Hz
c.)160 Hz
d.)1.60 x 1011 Hz
8.)Calculate the energy of a photon of electromagnetic radiation whose frequency is 6.75x1012 s-1.
a.)4.47 x 10-21 Jb.) 2.94 x 10-38 Jc.) 4.44 x 10-5 Jd.) 9.82 x 10-47 J
9.)Which change in the energy of hydrogen’s electron results in an emission of a photon?
a.)n=1 to n=2b.) n=2 to n=0c.) n=1 to n=0d.) n=3 to n=1
10.)Which quantum number describes the shape of an orbital in a given energy level?
a.)nb.) lc.) mld.) ms
11.)The electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5 corresponds to which element?
a.)Clb.) Gec.) Id.) Br
12.)How many core electrons does elemental zinc have?
a.)18b.) 20c.) 30d.) 36
13.)What principle does the following statement describe:
For degenerate orbitals, the lowest energy is attained when the number of electrons having the same spin is maximized.
a)Heisenberg’s Uncertainty Principle
b)Pauli Exclusion Principle
c)Hund’s Rule
d)Aufbau Principle
14.)An atom of element number 33 is in its ground state. Which one of the following sets of quantum numbers could not apply to any of its electrons.
a.)n = 3, l = 2, ml = 0, ms = -1/2
b.)n = 4, l = 0, ml = 0, ms = -1/2
c.)n = 4, l = 2, ml = 1, ms = +1/2
d.)n = 4, l = 1, ml = 0, ms = -1/2
15.)Which of the following are considered an isoelectronic series of substances?
a.)Mg2+, Na+, Ar
b.)Ne, O2-, Cl-
c.)Ar, K+, Cl-
d.)N3-, H+, He
e.)Rb+, Kr, I-
16.)Which atom has the largest radii?
a) Nb) Oc) Pd) S
17.)Which ion has the smallest radii?
a) N3-b) O2-c) P3-d) S2-
18.)Fill in the blank boxes in the following table. You may use appropriate short-hand notation for the electronic configurations.
Element / Atomic Number / Ground State Electron Configuration / #Core Electrons / #Valence Electrons / #Unpaired ElectronsSi / 14
18 / 3 / 3
53 / [Kr]4d105s24p6 / 8
Mo
19.)Consider the combustion of gaseous ethene.
a.)Write the reaction, assuming that the hydrocarbon undergoes complete combustion. (Hint: hydrocarbons ending with “ene” follow the formula CnH2n)
b.)Using the reaction written in part a, calculate the enthalpy of reaction using formation enthalpies given below:
Substance / ΔHf°Ethane(g) / 52.30 kJ/mol
Carbon dioxide(g) / -393.5 kJ/mol
Water(g) / -241.82 kJ/mol
20.)Consider two solutions, the first being 50.0 mL of 1.00 M CuSO4 and the second 50.0 mL of 2.00 M KOH. When the two solutions are mixed in a constant pressure calorimeter, a precipitate forms and the temperature of the mixture rises from 21.5 °C to 27.7 °C.
a.)Write the net ionic equation below, remembering that all alkali metals are soluble in water.
b.)Before mixing, how many grams of copper are present in the solution of CuSO4?
c.)From the following calorimetric data for enthalpy, calculate ΔH for the reaction that occurs on mixing. Assume the total volume of the solution is 100.0mL and that the calorimeter absorbs a negligible amount of heat from the reaction. Also identify what is absorbing heat and what is releasing heat.
dsolution = 1g/mlCs = 4.184J/(g°C)
21.) Complete the energy level diagram for electrons in an atom. Draw the orbital energy diagram for a manganese, Mn, atom (Z=25). Label each orbital (1s, 2s,2p, etc.). Indicate electrons as up and down arrows.
22.)a) Write the full electron configuration of a ground state Ag atom.
b) Write the condensed electron configuration of Sn4+.
23.)A pulsar (an extremely magnetic and rapidly spinning neutron star) is emitting electromagnetic radiation at 0.0035 nm. This is in the spectrum of gamma radiation. If a detector is capturing 3.2 x 108 photons per second at this wavelength, what is the total energy of the photons detected in one hour?