Exam 2 Review

Precipitation and Molarity

100

Difference between total ionic and net ionic equation

A net ionic equation shows only the elements and compounds that are involved in a

reaction, while a complete ionic equation also includes the spectator ions

200

Does a precipitate form for this chemical equation: AgNO3(aq) + KCl(aq) →

Answer: Yes

AgCl(s) + KNO3(aq)

300

How many grams of hydrogen chloride (HCl) are required to prepare 500 mL of 5M HCl in water?

91.25 g HCl

400

Using the chemical equation how many grams of HCl is required to neutralize 20.0 mL of 0.5 mol NaOH? HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

0.365 g HCl

Oxidation and Reduction

100

Define oxidation and reduction

Oxidation is the loss of electrons and Reduction is the gain of electrons

200

MnO2 (Find the oxidation number of Mn)

+4

300

Determine what is being oxidized and what is being reduced: 2HCl (aq) + Zn (s) → H2 (g) + ZnCl2 (aq)

Oxidized is Zn

Reduced is H in HCl

400

Balance the chemical equation and determine what is being oxidized and what is being reduced: AlCl3 (aq) + Mg (s) → Al (s) + MgCl2 (aq)

2AlCl3 (aq) + 3Mg (s) → 2Al (s) + 3MgCl2 (aq)

Oxidized is Mg

Reduced is Al in AlCl3

Wavelength and Frequency

100

Calculate the frequency of blue light having a wavelength of 350 cm

8.57 x 10⁷ Hz

200

What is the energy of a photon with a wavelength of 200 cm?

9.939 x 10^-26 J

300

Determine the wavelength of light emitted when an electron of an helium atom makes a transition from orbital 3 to orbital 6

-1.094 x 10^-6

400

When an electron absorbs -4.0 x 10^-35 J of energy and ascends from energy level 2, what energy level does the electron end at?

2

Quantum Numbers

100

How many nodes are in P, S, F, and D orbital

P = 2, S = 1, F = 8, D = 4

200

Determine the sublevels for 3

s, p, d

300

Given the information find the n, l, and ml: 4d

n=4, l = 2, ml = -2, -1, 0, 1, 2

400

Write a set of quantum number for 3p

n=3, l = 1, ml = -1, 0, 1

Miscellaneous

100

Write the condensed electron configuration for Cu

[Ar]4s¹3d¹⁰

200

What is the pOH of a 0.0235 M HCl solution?

12.371

300

Is there something called a 1d or 2d orbital?

No

400

Give the definitions for Aufbau principle, Pauli exclusion principle, and Hund's rule

Aufbau Principle: Lower energy orbitals fill first

Pauli Exclusion principle: Degenerate orbitals (those of the same energy) are filled with electrons until all are half-filled before pairing up of electrons

Hund's rule: Individual orbitals only hold two electrons, and each should have a different spin