FLORIDA INTERNATIONAL UNIVERSITY DEPARTMENT of CHEMISTRY AND BIOCHEMISTRY

BISCAYNE BAY CAMPUS

Name: _________________________________ CHM 1045 Panther ID: __________________________________ Summer 2012 First Exam TAs Name: _________________________

Useful Information:

Molar Mass (g/mol) Molar Mass (g/mol)

PCl5 = 208.2 C12H22O11= 342.30 Na2SO4 = 142.04 Cl2 = 70.91 SO2 = 64.07 K2PtCl4 = 415.1 NH3 = 17.03

1 mol = 6.02 x1023 atoms F = 1.8 C + 32 Pt(NH3)2Cl2 = 300.1 AlCl3 = 133.33

There are 34 multiple choice questions in this

test and one bonus question

1. Acetic acid boils at 244.2F. What is its boiling point in degrees Celsius?

a. 382.0C

b. 167.7C

c. 153.4C

d. 117.9C

e. 103.7C

2. The appropriate number of significant figures in the result of 15.234 - 15.208 is

a. 1 d. 4 b. 2 e. 5 c. 3

3. Which of the following is an extensive property of oxygen?

a. boiling point c. density e. mass b. temperature d. average kinetic energy of molecules Use the following choices to answer the next three questions: a. sodium b. zinc c. nitrogen d. oxygen e. mercury

4. This element is involved in combustion reactions.

5. This element is the most reactive element from those listed.

6. This element develops a +2 charge when combined with other elements.

7. Which of the following isotopes have the same number of neutrons as 129Xe a. 129I b. 127Te c. 131Xe d. 180Re e. 75Ge

8. An unknown laboratory sample is analyzed by different methods in the laboratory and found that it can be separated by physical means. This is an indication that you are sample is:

a. an element b. a mixture c. a compound d. hydrogen gas

9. Identify the statement that is incorrect

a. evaporation of oxygen requires energy b. the state of matter with the highest energy level is the gas state c. the process of freezing requires energy d. molecules in the solid state have the strongest forces of attraction e. all of the above are correct

10. The correct label of the prefix femto is

a. 109 b. 10-9 c. 10-12 d. 10-15 e. 1015

11. Which of the following is the longest distance?

a. 0.400 km b. 30,000 mm c. 5,000 cm d. 500 m

12. A cubes height was measured as 2.75 inches. The cube is made out of aluminum that has a density of 2.35 g/cm3 What is the mass of the cube? (1 in = 2.54 cm)

a. 801 g b. 145 g c. 2.98 g d. 0.540 g

13. How many sulfur atoms are there in 25 molecules of C4H4S2?

a. 1.5 X 1025 b. 4.8 X 1025 c. 3.0 X 1025 d. 50 e. 64

14. Water, no matter where it is found, consists of hydrogen and oxygen combined in a 1:8 ratio by mass. This is a statement of

a. the law of multiple proportions c. the law of conservation of mass b the law of definite proportions d. the law of conservation of energy

15. A compound was analyzed and found to have the following composition: 27.0 % S; 13.4 % O; and 59.6 % Cl. determine the empirical formula of the compound.

a. SOCl3 b. S2OCl c. S4O2Cl9 d. S2OCl4 e. SOCl2

16. Determine the molecular formula for the compound in the previous question if the molar mass was determined to be 119 g/mol

a. SOCl2 b. S2OCl

c. SOCl3 d. S2OCl4 e. SOCl

17. What is the oxidation number of each boron atom in the compound, Na2 B4 O7 ?

a. -1 b. -3 c. +3 d. +6 e. +1

18. The correct chemical formula for bromine pentafluoride is:

a. BrF b. BrF4 c. BrF5 d. Br5F

e. Br3F2

19. When the following equation is balanced the coefficient in front of H2O is: C2H4O + O2 CO2 + H2O

a. 1 b. 5 c. 3 d. 2 e. 4

20. A compound that has the formula Ba(CN)2 should be named: a. barium cyanide b. boron cyanide c. boron cyanate d. barium cyanate e. barium (II) cyanide

21. Which one of the following substances is chloric acid? a. HClO b. HClO3 c. HClO4 d. HCl e. HClO2

22. What is the mass (in kg) of 6.89 1025 molecules of SO2?

a. 7.33 g b. 5.04 g c. 3.03 g d. 4.39 g e. 6.80 g

23. Cisplatin, Pt(NH3)2Cl2, is prepared by the following reaction: K2PtCl4 + 2 NH3 2 KCl + Pt(NH3)2Cl2

How many grams of cisplatin will be produced from 155.8 grams of K2PtCl4 and 15.6 grams of NH3? You must balance the equation first

a. 80.4 g b. 112.6 g c. 56.30g

d. 40.2 g

24. In the previous question the percent yield of the reaction is 77.5 %. How many grams of product will a student make in the laboratory when running the reaction?

a. 87.3 g b. 54.3 g c. 145 g d. 27.1 g

25. How many grams of aluminum chloride, AlCl3, can be produced from 25.0 g of chlorine when more than enough aluminum is

present for the reaction? Al (s) + Cl2 (g) AlCl3 (s) (needs to balance)

a. 54.0 g b. 47.0 g c. 70.5 g d. 31.3 g

26. In the reaction above who is the reducing agent? a. Al b. Cl2 c. AlCl3 d. not a redox reaction

27. What is the chemical formula of nickel (IV) chromate? a. NiCrO4 b. NiCrO3 c. Ni(CrO4)2 d. Ni(CrO3)2

28. Which of the following is a weak acid in water? a. HClO3 b. HNO3 c. HClO4 d. HF

29. Which of the following represents the net ionic equation when Ba(NO3)2 (s) is mixed with (NH4)2SO4 (aq)? a. Ba+2 + SO4-2 BaSO4 (s)

b. 2NH4+ + 2NO3- 2NH4NO3 (s) c. Ba(NO3)2 + SO4-2 BaSO4 (s) + 2NO3-1 d. Ba(NO3)2 (s) + (NH4)2SO4 BaSO4 + 2NH4NO3 e. no reaction Use the provided portion of the activity series to answer the next two questions. The activities series is arranged in order from the most to the least active substance

Ca (s) Ca+2 + 2e- Mg (s) Mg+2 + 2e- Zn (s) Zn+2 + 2e-

Cu (s) Cu+2 + 2e-

30. Determine the reaction that could not happen as written: a) Ca (s) + Cu+2 b) Ca (s) + Zn+2 c) Ca+2 + Zn (s) d) Cu+2 + Mg (s)

31. The strongest reducing agent from those listed is: a. Cu (s) b. Zn+2 c. Zn (s) d. Cu+2

32. Predict which of the following compounds are soluble in water. PbS, AgNO3, K2CO3, MgSO4, Al(OH)3

a. Only MgSO4, K2CO3, and AgNO3 are soluble. b. All the compounds are soluble. c. Only AgNO3 and K2CO3 are soluble. d. Only PbS and Al(OH)3 are soluble. e. All the compounds are insoluble.

33. Choose the reaction that represents the combustion of C6H12O2.

a. C6H12O2(l) + 8 O2(g) 6 CO2(g) + 6 H2O(g)

b. Mg(s) + C6H12O2(l) MgC6H12O2(aq)

c. 6 C(s) + 6 H2(g) + O2(g) C6H12O2(l)

d. C6H12O2(l) 6 C(s) + 6 H2(g) + O2(g)

e. None of the above represent the combustion of C6H12O2

34. Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed.

a. K+(aq) + NO3-(aq) KNO3(s)

b. Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3-(aq) FeS(s) + 2 K+(aq) + 2 NO3-(aq)

c. Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3-(aq) Fe2+(aq) + S2-(aq) + 2 KNO3(s)

d. Fe2+(aq) + S2-(aq) FeS(s) e. No reaction occurs.

Answers 1 D

2 B

3 E

4 D

5 A

6 B

7 B

8 B

9 C

10 D

11 D

12 A

13 D

14 B

15 E

16 A

17 C

18 C

19 E

20 A

21 B

22 A

23 B

24 A

25 D

26 A

27 C

28 D

29 A

30 C

31 C

32 A

33 A

34 D