CHEM-1414 Exam 3 review

Real Gasses

100

What is the value of R with units of J/mol*K?

8.314

200

Under what conditions will real gasses obey the ideal gas law?

Low pressures and high temperature

300

What is the speed of krypton at 80.0 ^oF?

299 m/s

400

What is the observed pressure for 225mL of Cl₂ gas at 295 K using van der Waal's equation? (a= 5.42, b=0.0540, n=2.50)

3.30 atm

500

What is the value of 'b' for 125 mL of Cl₂ at 355 K and 1.50 atm using Van der Waal's equation?  (Use a = 6.49, and n = 1.00)

0.055

Orbitals

100

What are the possible values for m_l if n=3?

-2, -1, 0, 1, 2

200

How many angular and radial nodes are in a 4d orbital?

2 angular nodes.

1 radial node.

300

Draw a 3p orbital.  Include all nodes and charges.

Drawing 1

400

Draw the radial distribution graph for a 3s orbital.

Drawing 2

500

Draw a 4d orbital and its corresponding radial distribution graph.  Include all charges and nodes on your orbital drawing.

Drawing 3

Electron configuration

100

What element is designated by the following electron configuration?

1s² 2s² 2p⁶ 3s²

Magnesium (Mg)

200

What is the electron configuration of Phosphorus?

1s² 2s² 2p⁶ 3s² 3p³

300

What is the shorthand/abbreviated electron configuration of Tin?

[Kr] 5s² 4d¹⁰ 5p²

400

What element is classified by the following shorthand electron configuration?

[Xe] 6s² 4f⁵

Promethium (Pm)

500

What is the shorthand/abbreviated electron configuration of Zn²⁺?

[Ar] 4s⁰ 3d¹⁰

Or: [Ar] 3d¹⁰

Light

100

A certain microwave has a wavelength of 0.032 meters. Calculate the frequency of this microwave.

9.4 x 10⁹ Hz

200

The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm. What is the frequency of the light?

5.09 x 10¹⁴ Hz

300

Calculate the energy of one photon of yellow light that has a frequency of 5.09 x 10¹⁴ Hz.

3.37 x 10^-19 J

400

A radio station broadcasts at a frequency of 590 KHz. What is the wavelength of the radio waves?

5.1 x 10² m

500

Microwave ovens emit microwaves with a wavelength of 12.9 cm. What is the energy of exactly one photon of this microwave?

1.54 x 10^-24 J

Lewis Structures

100

Which element is the central atom in the following chemical formula?  COH₂

Carbon (C)

200

How many electrons are in the following chemical formula?  NH₄⁺

8 electrons

300

Draw the Lewis structure for NH₃Cl⁺.

Drawing 4

400

Draw all resonance structures for CO₃^2-

Drawing 5

500

Draw all resonance structures for dihydrogen phosphate.

Drawing 6