Chem1701 Gceai Fall 2008 Mt

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Department of Chemistry

College of Science

GENERAL CHEMISTRY I EACHEM 1701

Midterm ExamFall 2008

Name:

ID:

Section:

Instructor's name:

Important Notes:1-The exam consists of 6 pages including this page and the periodic table.2. Avogadro's number = 6.022x1023

PART POINTS

I /6

II /6

III /8

TOTAL /20


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Part I (6 points total, 0.5 point each)

Multiple choice questions. Circle the correct answer.

1. Which of the following is correct about homogeneous mixtures?a. They have a fixed composition.b. They are pure substances.c. They can be separated into their components relatively easily using physical

methods.d. They can be made only by dissolving a solid into a liquid.

2. Which of the following is a chemical property of gold?a. It is solid at room temperatureb. It has a melting point of 1064.43 Cc. It does not rustd. It has a shiny surface

3. If you carry out the following calculation (2089.24 + 1.9)/3.0, the answer with theappropriate number of significant figures is

a. 700.0b. 697.03c. 6.97 x 102d. 7.0 x 102

4. The proper name for HClO2 is:a. Chloric acidb. Chlorous acidc. Hydrochloric acidd. Perchloric acid

5. A volume of 3.5 m3 is equivalent to __________ cm3:

a. 3.5x10-6 cm3b. 3.5x102 cm3c. 3.5x106 cm3d. 350 m3

6. FeCl3 is:

a. A diatomic moleculeb. An ionic compoundc. An oxyacidd. A polyatomic molecule

7. 31P3- contains:

a. 15 protons and 15 electronsb. 16 protons, 18 electronsc. 16 protons, 15 neutronsd. 15 protons, 18 electrons

8. Which of the subshells below can not exist?

a. 4db. 2sc. 4fd. 2d


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9. Which of the following statement is true:

a. Electrons in different orbitals have the same energies.b. In a degenerate set of orbitals, the paired electrons have the same spin.c. No more than two electrons can be accommodated in one orbital.d. In the ground state electronic configuration, orbitals of higher energy are filled first

10. In an atom, the maximum number of electrons that can have the quantum numbersn=4 and ms=+1/2 is:

a. 4b. 16c. 18d. 32

11. Which of the following statement is correct?a. NaCl and HNO3 are both strong acidsb. NaCl and HNO3 are both strong electrolytesc. NaCl is a weak electrolyted. HNO3 is a weak acid

12. Which of the following is true about aqueous ammonia (NH3 in water)?a. It is a strong baseb. It is a weak basec. It is a strong electrolyted. It is neither acidic nor basic

PART II: (6 points total)Answer each of the following questions in the space provided:

1. (1 point) Write the condensed (abbreviated) electron configuration for the element Pb.

2. (2 points) Using the table below, give a brief definition (maximum two lines) withexample of each of the following:

Definition & example

Intensive properties

Ionic compounds


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3. (3 points) Complete the table by giving the appropriate name or chemical formula:

Name formula

Aluminum nitride

Chromium(III) hydroxide

Hydrochloric acid

Cu2S

Ca(HSO4)2

CBr4

PART III: (8 points total)

Answer each of the following Problems in the space provided. Show your work.

1. (1 point) Write a net ionic equation for the reaction between HCl and Ca(OH)2.

2. (2 points) A 13.8 g sample of a compound containing only nitrogen and oxygen produceda total of 4.2 g of nitrogen when decomposed into its two elements. Determine the

empirical formula of the compound.

3. (1 point) Calculate the percentage (by mass) of hydrogen in HNO2.


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4. (1 point) Calculate the number of H atoms in 1 mole of C6H6.

5. (3 points) Ammonia and hydrogen chloride react according the following equation:

NH3 + HCl NH4Cl

In an experiment 34.0 g of ammonia reacted with 36.45 g HCl to produce 50.0 g of theproduct, what is the % yield of your reaction? (Hint: Find the theoretical yield first.)

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Chem1701 Gceai Fall 2008 Mt