CHEM 1300 Exam 3 practice Key PDF

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CHEM 1300 – Fall 2019 General Chemistry I Exam 3 Practice Name:

_______________

Date:

Please read the following guidelines: 1) 2) 3) 4)

You will have 60 minutes to complete the exam This is a closed book exam. No notes are permitted. Only scientific calculators are permitted. Violation of the Honor Code (i.e. cheating) will result in a zero and will be reported to the Dean’s Office. 5) You must turn in all exam pages. 6) Your cell phone must be turned off and placed on the desk in front of you in a face down position or I will assume you have intentions of cheating.

GOOD LUCK! Avogadro’s number: 6.022*1023

c= 3.00 * 108 m/s

Gas constant (R): 0.0821 Latm/molK

h= 6.626 *10-34 J*s

1

Complete the following table

Formul a CS2

Lewis Structure

Molecular Geometry

AsCl5

SiBr4

SeI4

KrF4

2

Hybridization Bond (central atom) Angle(s)

Polarity

1. Consider the following compound. Draw the Lewis structure. How many sigma and how many pi bonds does it contain? CH3CHCHCO2H

2. Draw the Lewis structure of SeO3 where NONE of the atoms violate the octet rule. Draw all equivalent resonance structures (if applicable). Assign formal charge to each atom.

3. Use the bond energies provided in the attached table to estimate ΔH°rxn for the reaction below. CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g)

3

ΔH°rxn = ?

4. Draw a 3D representation of CH3CH2CH2OH. Determine the molecular geometry and hybridization about each interior atom.

5. What is the wavelength of the light emitted when the electron of hydrogen relaxes 1 1 − 2 ) from energy level 3 to energy level 1? E= 2.18*10 -18 J ( 2 nf ¿

4

6. (6 pts) Write the complete electron configuration for the following atoms/ions Ge: S2-: Cs+:

7. (6 pts) Write the condensed electron configuration for the following atoms/ions Ag: Cr2+: Te:

8. (6 pts) Draw the orbital diagram for Mo. Based on the orbital diagram, is Mo paramagnetic or diamagnetic?

9. What is the frequency of electromagnetic radiation with a wavelength of 530 mm?

5

10. Place the following in order of decreasing metallic character. P

As

K

11. Place the following in order of increasing atomic radius. Sr

Li

Ca

12. Place the following in order of increasing radius. I-

Mg2+

K+

13. How many unpaired electrons are present in the ground state P atom?

14. The element that corresponds to the electron configuration 1s22s22p63s23p64s13d5 is

15. What period 3 element has the following ionization energies (all in kJ/mol)? IE1 = 1012 IE2 = 1900 IE3 = 2910 IE4 = 4960 IE5 = 6270 IE6 = 22,200

16. Give the set of four quantum numbers that could represent the electron lost to form the K+ ion from the K atom.

17. Place the following in order of decreasing magnitude of lattice energy. NaF

RbBr

KCl

18. Place the following elements in order of increasing electronegativity. K

Cs

P

6

7...