Sample Exam 2

Duration of exam: 1:30 hours

Multiple Choice (Questions 1 to 6)

3 pts each

1. Which one of the following configurations violates Pauli’s exclusion principle?

2ss1

2pp

2pp c.

e. None of the above

2. How many orbitals are present in an s subshell?

a. 1

b. 3

c. 5

d. 7

e. 9

3. If a sample of (NH4)2S contains 8.0 moles of H, how many moles of (NH4)2S are present in the sample?

3.00 mols

12.00 mols

4.50 mols

9.75 mols

1.00 mol

4. One of the following statements is not true. Which one is it?

a. Bohr’s model works well only on single electron systems, while Quantum Mechanical model works well on single and multi-electron systems.

b. s subshell has a spherical shape.

c. A reducing agent gets oxidized in a redox reaction.

d. Fe(NO3)2 is an insoluble salt.

e. Avogadro’s number equals to 6.022 * 1023.

5. How much does 4.50 mol of CO weigh? Ignore significant figures.

a. 445 g

b. 564 g

c. 230 g

d. 245 g

e. 126 g

6. Choose the correct configuration of Manganese.

[Ar] 4d10 5s2 5p2

[Ar] 4s23d5

[Xe] 5s24d5

[Ar] 5s1 4d6

[Kr] 4s24d4

7. Identify the species being reduced in the following reaction:

Cr + Sn4+ Cr4+ + Sn
a. Cr

b. Sn4+

c. Cr4+

d. Sn

e. None of the above

8. Which is the right Lewis structure of PBr3?

e. None of the above

9. Example of a strong electrolyte is

a. HF

b. CO2

c. H3PO4

d. NH3

e. NaCl

10. Which of the following reactions is a decomposition reaction?

a. AgNO3(aq) + HCl(aq) AgCl(s) + HNO3(aq)

b. Na2O(s) + CO2(g) Na2CO3(s)

c. C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(l)

d. 2H2O(l) 2H2(g) + O2(g)

e. KOH(aq) + HCl(aq) KCl(aq) + H2O(l)

11. Given the following equation: 2 K + Cl2 —> 2 KCl

How many moles of KCl is produced from 2.50 g of K and excess Cl2

4.77

3.5

0.0639

0.00111

None of the above

12. Which of the following weighs most?

a. 2 * 1022 N2 molecules

b. 2.0 moles of H2O

c. 5 g of CO2

d. 2.0 moles of O2

e. The above quantities all weigh the same.

13. Which radiation among the options possesses the lowest energy?

Infrared rays

X-rays

Radio frequency waves

Microwaves

Visible light

14. Phenyl magnesium bromide is used as a Grignard reagent in organic synthesis. Determine its empirical formula if it contains 39.7458 % C, 2.77956 % H, 13.4050 % Mg, and 44.0697 % Br. (6 pts)

a. CHMgBr

b. C6H5MgBr

c. CH3MgBr

d. C2H5MgBr2

e. CH3Mg2Br3

15. How many valence electrons are there in Carbon?

a. 1

b. 3

c. 5

d. 7

e. 4

16. What is the energy of a photon of light whose frequency is 7.85*1015 Hz?

2.53 x 10-41 J

3.82 x 10-8

5.20 x 10-18 J

2.36 x 1024 J

e. None of the above

17. (file upload questions)

a. Write the balanced equation for the reaction that occurs when iron (II) chloride is mixed with sodium phosphate forming iron (II) phosphate and sodium chloride. (4 pts)

b. If 23 grams of iron (II) chloride reacts with 41 grams of sodium phosphate, what is the limiting reagent? (8 pts)

c. How much sodium chloride can be formed? (6 pts)

d. If 16.1 grams of sodium chloride are formed in the reaction, what is the percent yield of this reaction? (4 pts)

18. When aqueous solutions of aqueous solutions of Ba(NO3)2 and Na2CO3 are mixed, what products are formed? Write the balanced molecular equation with correct phases of the reactants and products in parentheses, the complete ionic equation, and the net ionic equation of the reaction. What are the spectator ions of this reaction? (10 pts)

(file upload question)

19. Choose the correct option in each case. No explanation needed. (1 pt each):

1 mole of S8 or 1 mole of P4 or They have equal number of molecules

b. Electromagnetic spectrum with higher wavelength.

Red or Blue

c. Higher ionization energy

Strontium or Calcium

d. Synthesis Reaction

2KNO3 + Ag2SO4 K2SO4 + 2AgNO3 or 2K + SO3 K2SO3

20. Fill up the blanks. (3 pts each)

a. Molar mass of PCl3 with 6 sig figs is _______________ .

b. CH4(g) + 2O2 (g) CO2 (g) + 2H2O (g) is a type of

_________________________ reaction.

c. A/an ________ is a probability map that shows statistical distribution of where an electron probably might be found.

d. The salt that forms when KOH reacts with H2SO4 is __________ .

21. Draw the Lewis structure of H2CO. (4 pts)

There will be one or two extra credit questions on the exam!!

Electromagnetic Spectrum

Polyatomic Ions List

Solubility Chart

Salts containing the following ions

Solubility

Exceptions

Nitrates, NO3-

Always soluble

None

Acetate, CH3COO-

Always soluble

None

Group I metal ions (Li+, Na+, K+, Cs+, Rb+)

Always soluble

None

Ammonium, NH4+

Always soluble

None

Halides, Cl-, F-, Br-, I-

Usually soluble

Insoluble if present with Ag+, Pb2+, Hg22+ ions

Sulfates, SO42-

Usually soluble

Insoluble if present with Ca2+, Sr2+, Ba2+,

Pb2+,Hg22+ ions

Carbonates and Phosphates, CO32- and PO43-

Usually insoluble

Soluble if present with Gp IA and NH4+ ions

Hydroxides, OH-

Usually insoluble

Completely Soluble if present with Gp 1A,

NH4+ ions and slightly soluble if present with Ca2+, Sr2+, Ba2+ ions

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