Gen Chem Exam 2

Electromagnetic Waves

100

One type of laser used in the treatment of vascular skin lesions is a neodymium-doped yttrium aluminum garnet, or Nd:YAG laser. The wavelength commonly used in these treatments is 532nm. What is the frequency of this radiation?

5.64X10¹⁴ s^-1

200

What is the wavelength (in meters) of an electromagnetic wave whose frequency is 1.61X 10^12 S-1?

1.86X10^-4m

300

Calculate the energy per photon of light with wavelength 650nm

3.06X10^-19J

400

Calculate the wavelength (in centimeters) of light that has energy 1.32X10^-23 J/photon.

1.51cm

500

A clean metal surface is irradiated with light of three different wavelengths: λ1,λ2,and λ3. The kinetic energies of the ejected electrons are as follows: λ1: 2.9X10^-20J, λ2: approximately 0; λ3: 4.2X 10^-19J. Arrange the light in order of increasing wavelength.

λ3< λ1< λ2

Empirical Formula/ Molecular formula

100

Write the empirical formulas for the following molecules: (a) glucose (C₆H₁₂O₆) (b) adenine (C₅H₅N₅) and (c) nitrous oxide (N₂O)

(a) CH₂O

(b) CHN

(c) N₂O

200

Determine the empirical formula of a compound that is 53.3% C, 11.2% H, 35.5% O by mass. What is the molecular formula if the molar mass is approximately 90 g/mol?

C₂H₅O

C₄H₁₀O₂

300

A compound is 89.9% C and 10.1% H by mass. Determine the molecular formula if the molar mass is 120 g/mol?

C₉H₁₂

400

determine the empirical formula of a compound that is 30.45% nitrogen and 69.55% oxygen by mass.

NO₂

500

determine the empirical formula of a compound that is 30.45% nitrogen and 69.55% oxygen by mass. Given that the molar mass of the compound is approximately 92g/mol, determine the molecular formula of the compound.

N₂O₄

Electron configurations/ Quantum Numbers

100

What are the quantum numbers that correspond to a 3p orbital?

3,1,(-1, 0, 1)

200

What are the possible values for ml when the principal quantum number (n)  is 3 and the angular momentum quantum number (l) is 2?

-2,-1,0,+1,+2

300

write the abbreviated electron configuration for the following atoms: Cu

[Ar] 4s¹ 3d¹⁰

400

electron configuration for Bi

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p³

500

Draw the orbital energy diagram for sulfur

1s² 2s² 2p⁶ 3s² 3p⁴

Atomic Radius/ Ionization energy

100

Arrange the elements O, S, and Se in order of increasing IE1

Se < S< O

200

Would you expect Na or Mg to have the greater first ionization energy (IE1)

IE1: Mg > IE Na

300

Referring to only the table, arrange the elements Ge, Se, and F in order of increasing atomic radius.

F<Se<Ge

400

Referring to only the table, arrange the elements P, S, and O in order of increasing atomic radius.

O<S<P

500

Higher Zₑff → ____ atomic radius and ____ ionization energy. (larger or Smaller)

Higher Zₑff → Smaller atomic radius and Higher ionization energy.

Naming compounds/ molar mass

100

Write the formulas for:

-Phosphorus pentachloride

-Dichlorine trioxide

-Silicon dioxide

-PCl₅

-Cl₂O₃

-SiO₂

200

Name the compunds:

PbO₂

Ba(OH)₂

(NH₄)₂SO₄

- Lead (IV) oxide

-Barium hydroxide

-Ammonium sulfate

300

Determine (a) the number of moles of CO2 in 10.00g of carbon dioxide and b) the mass of 0.905 mole of sodium chloride.

a) 0.2272 mol 

b)52.9 NaCl

400

Determine the mass of 7.92X10¹⁹ carbon dioxide molecules

5.79X10^-3g CO₂

500

Determine the number of moles in 59.8g sodium nitrate (NaNO₃)

0.704mol