Nya Winter 08 Unit Test 1

General Chemistry – 202NYA Section 22 – Unit Test 1 (LILAC) February 21, 2007 Name:

Student Number:

Instructions 1. No extra books or papers are permitted in this test. You are only permitted the use of provided materials. You may use the back of the pages to do your rough work. 2.

The duration of this exam is 1 h.

3.

Calculators may not be shared.

4.

In order to receive full credit for your answer, all your work must be shown (units, formulas where necessary, dimensional analysis). You will also be graded on proper usage of significant figures and units.

5. Your attention is drawn to the college policy on cheating. This policy will be enforced.

DATA and NOTES: - A periodic table is provided at the back of the exam. Assume all the conversion on this page are exact numbers - 1 Hz = 1 s-1 - Planck’s constant: 6.626 x 10-34 J s or kg m2/s - Bohr’s constant: -2.18 x 10-18 J - Rydberg’s constant: 1.097 x 107 m-1 - Speed of light: 3.0 x 108 m/s - Mass of an electron: 9.11 x 10-31 kg

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1. Draw the following orbitals on the coordinate axes provided below. (6 marks) z

z y

y x

A 2px orbital 2.

x

The orbital with n = 1, l = 0

What are the names of each of the following quantum numbers? What information is given by each of them? (8 marks)

a) n:_________________________________________________________ ______________________________________________________________ b) l:__________________________________________________________ ______________________________________________________________ c) ml:_________________________________________________________ ______________________________________________________________ d) ms:________________________________________________________ ______________________________________________________________

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3.

An electron makes a transition in a hydrogen atom from n = 4 to n = 2. a. What is the change in energy associated with this transition? (4 marks) b. Is this process an emission or an absorption of light? (2 marks) c. What is the wavelength of light, in nm, associated with this transition? (3 marks). d. To what which part of the electromagnetic spectrum does this transition belong ? (2 marks)

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4. a. Is the atomic radius of chlorine greater or less than that of sulfur? Explain. (4 marks)

b. Rank the following ions in order from smallest to largest. (2 marks) N3-, P3-, As3-

5. Consider the element lead. a. Write the electronic configuration (condensed) for the lead(0). (3 marks)

b. Write a complete set of quantum numbers for the last electron added to lead(II). (4 marks)

c. Draw a (condensed) orbital filling diagram for lead(IV). (4 marks)

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6.

Consider the apparatus shown in this diagram: a. Label the 3 omitted parts of this diagram (3 marks). b. Name the scientist who used this apparatus. (2 marks) Name:____________________________ c. Draw and fully label a model of the atom that could explain the results depicted below (3 marks).

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