Chem 1A - Exam 2 Review

Light

100

When energy increases, frequency __________, and wavelength __________.

increases, decreases

200

True or False: Schrodinger founded the uncertainty principle.

False.

300

What is the frequency of light with a wavelength of 210.0 nm?

1.428 x 10^15 s-1

400

Which emission produces lower frequency light?

1) n = 5  -->  n = 2

2) n = 6  -->  3

2) n = 6  -->  3

500

A chemist is using radiation with a frequency of 8.01 x 1014 1/s.

a) Determine the wavelength of this radiation in meters.

b) Estimate the energy in kJ for one photon of this radiation.

a)  λ = 3.74 x 10-7 m

b) E = 5.30 x 10-22 kJ

Lewis Structure

100

For NO₂Cl, which atom goes to the center of the molecule?

N

200

Is AsCl₃ a polar or nonpolar molecule?

Polar

300

Given C₂H₆ and C₂H₄, which will have a shorter distance between the bonds?

C₂H₄

400

How many sigma & pi bonds are there for HCN?

σ = 2, π = 2

500

The hybridization for BrO₂- is

sp³

Titration

100

How many mol of NaOH would be required to neutralize 2 mol of hydrosulfuric acid?

4 mol

200

Some 1.84 M solution is transferred to another container and diluted to 65 mL of 0.85 M solution. How many mL was transferred?

30 mL

300

To make a 0.90 M solution, you add 45 mL of 1.78 M solution to a beaker. How much water should be added to produce the wanted solution?

44 mL

400

What is the molarity of the solution prepared by dissolving 25.00 g of potassium hypochlorite in 0.150 L water?

1.84 M

500

A solution of 1.64 M LiOH is used to neutralize 29.30 mL of an H₃PO₄ solution. If 86.25 mL of the LiOH solution is required to reach the endpoint, what is the molarity of the H₃PO₄ solution?

1.61 M H₃PO₄

Electrons

100

Find quantum number l for Si.

1

200

List the oxidation numbers of P.

+3, +2, -3

300

How many paramagnetic electrons are in Ag?

1

400

How many electrons are the n = 5 shell of Sb⁺²?

a) 2            b)  3            c) 8           d) 10

b) 3

500

Which set of quantum numbers is not possible?

a) 6, 2, 0, ½ 

b) 3, 1, 1, -½

c) 2, 3, -2, ½

d) 3, 0, 0, -½

c) 2, 3, -2, ½

Periodic Properties

100

Which increases as you travel to the bottom left of the periodic table?

Radius

200

Which is more electronegative: Ca or Ga

Ga

300

Rank by increasing electronegativity: Br-, Br+, Br

Br+, Br, Br-

400

Rank by increasing radius: As, Sb⁺², Sb, Ge

As, Ge,  Sb⁺², Sb

500

Rank by increasing ionization energy: Cd, As, N, Zn

Cd, Zn, As, N