T2SCS.95S                                                 ---A SAMPLE TEST ---                         10/18/97

CHEMISTRY 1211  TEST #2  (50 min; 100 pts)       5/1/95              Name____________________

GPC - Dunwoody (Dr. Kim)                                 Calculator & Model #______________

Use a Scantron sheet for Multiple Choices (4pts each): do not blacken any if the choice is F.

1mi=1.609km; 1ft=30.48cm; 1lbs=453.6g; 1gal=3.785L; 1mL=1cm3 ; c=2.9979x108m/s; g=9.807m/s2; 1amu=1.66054x10 -27kg; mp=1.67262x10-27kg; mn=1.67493x10 -27kg; 1barrel=42gal.

1. Find the formula weight for Fe2(SO4) 3.  A(100), B(200), C(300), D(400), E(500) amu.

2. Find the  mass % of O in  Fe2(SO4 )3 . A(18), B(33), C(48), D(57), E(67) %.

3. Find the  mole % of O  in Fe2(SO4 )3 .  A(18), B(33), C(60), D(66), E(71) %.

4. How many moles of  Fe2(SO4)3   are present in 1.0 pound of it ?
     A(0.4), B(0.7), C(0.9), D(1.1), E(1.6) mols.

5. How many moles of  O atoms are present in 1.0 pound of  Fe2(SO4)3  ?
     ca. A(6), B(9), C(11), D(14), E(18) mols.

6. How many  O atoms are present in 1.0 pound of  Fe 2(SO4)3  ?
     ca. A(1010), B(1015 ), C(1020), D(1025), E(1030) atoms.

7. What is the oxidation state of  O in  Fe2 (SO4)3 ?   A(-2), B(-1), C(0), D(1), E(2).

8. What is the oxidation state of  S in  Fe2 (SO4)3 ?  A(-2), B(2), C(4), D(6), E(8).

9. What is the oxidation state of  Fe in  Fe2 (SO4)3 ?  A(0), B(1), C(2), D(3), E(4).

10. How many moles of ions generated when one mol of  Fe 2(SO4)3 , a strong electrolyte, is dissolved in water.
A(1), B(2), C(3), D(4), E(5).

         Given the types of reactions; (A) Combination, (B) Decomposition, (C) Displacement, (D) Metathesis. Indicate a type for the following four reactions.

11. 2H2O2(aq) -> 2H2O(l) + O2(g)

12. (   )Fe + (   )O2 -> (   )Fe2O3

13. Cu(s) + 2AgNO3(aq) -> 2Ag(s) + Cu(NO3)2(aq)

14. 2KI + Pb(NO3)2 -> 2KNO3 + PbI2

15. Which reaction does not involve oxidation/reduction? A(#1); B(#2); C(#3); D(#4)

16. In the reaction #3, Cu is oxidized and Ag+ is reduced. A(True); B(False)

17. Correct coefficients for the reaction #2 are A(2,3,4); B(2,4,3); C(3,4,2); D(4,3,2).

18. The oxidation number of Fe in Fe2O3 is A(1), B(2), C(3), D(-2), E(-3).

19. The mass % of Fe in Fe2O3 is A(30), B(40), C(50), D(60), E(70), F(80) %.

20. An iron nail of 1.0g, when rusted completely, produces A(1.0), B(1.4), C(1.8), D(2.8)g of Fe2O3.

21. Reaction #4 occurs because A(KI), B(Pb(NO3) 2), C(KNO3), D(PbI2), is an insoluble salt.

22. Which are the spectator ions in the reaction #4 ?

(A) K+ & NO3-, (B) K+ & I-, (C) Pb2+ & NO3- , (D) I- & Pb2+.
 

23. The net ionic equation for the reaction #4 

must be (A) 2K++2NO3- ->2KNO3(s) ,    (B) 2K++2I- -> 2KI(s) ,
            (C) Pb 2++2NO3- -> Pb(NO3)2(s) , (D) 2I-+Pb2+ -> PbI2(s).

*                  *                  *                 *                 *









24. Tap water does conduct electricity because the following ions dissolved in it:

A(Fe2+,Cu2+,I-,PO4- ), B(Hg2+,Pb2+,I-,NO3- ), C(Na+,K+,NO3-,SO4 2-), D(Ca2+,Mg2+,Na+,HCO3 -,Cl-).

25. Which is not an acid or does not contain an acid ?

A(Vinegar), B(Lemon); C(Vitamin C), D(Aspirin), E(Antacid).

26. Which one is NOT a strong acid? A(HClO4), B(HCN), C(HBr), D(HNO3), E(HI).

27. Which salt is soluble in water? A((NH4)2 SO4), B(AgCl), C(BaCO3), D(PbSO4), E(Ca 3(PO4)2).

28. An exchange reaction in an aqueous solution will occur if it produces
(A) an insoluble salt, (B) water, (C) a gas, (D) A & B, (E) All of them (A, B & C).

29. What are final products of the reaction? CaCO3(s) +HNO3(aq) -> ( ? ) A(Ca(NO3)2 & H 2CO3), B(The reaction will not occur), C(Ca(NO 3 )2, H2O & NO2), D(Ca(NO 3) 2, H2O & CO2),

30. Find molar mass of ethanol(C2H5OH) and the mass (in g) of an ethanol molecule? A(46.1g; 2.8x10-24g), B(46.1g; 7.66x10-23g), C(64.1g; 2.8x10-24g), D(64.1g; 7.66x10 -23g).

31. Boric acid, H3BO3, is a mild antiseptic and often used as an eye wash. A sample contains
0.543 mol H3BO3. Its mass in the sample is A(63.3), B(66.3), C(63.6), D(33.6), E(36.3) g.

32. Adipic acid (composition: 49.3% C, 6.9% H, 43.8% O in mass) is used in the manufacture
of nylon. Its molecular weight is 146amu. Find its molecular formula.
A(C9H16O), B(C8H14O2 ), C(C7H8O3), D(C6H10 O4), E(C5H6O6), F(C4 H10O4).

33. 20.0 lb of acetaldehyde and 15.0 lb of oxygen, under pressure at 60oC, are reacted
to generate acetic acid for production of vinegar: 2CH3CHO(l) + O2(g)   -->  2HC2H3O 2(l)
(1) Which is the limiting reactant? (2) How many lb of acetic acid can be produced?
(3) How many lb of the excess reactant remain after the reaction is complete?
A(Acetaldehyde; 12.6lb; 2.7lb), B(Oxygen; 12.6lb; 2.7 lb), C(Acetaldehyde; 12.6lb; 7.7lb), D(Oxygen; 12.7lb: 7.7lb), E(Acetaldehyde; 27.3lb; 7.7lb), F(Oxygen; 27.3lb: 7.7lb).

34. You have a solution of 14.8M NH3. How many mL of this solution do you require to give 100.0mL of 1.000 M NH3 when diluted? A(6.76), B(67.6), C(14.8), D(148); E(1,480).


35. All of the following may change during a chemical reaction except A(total volume), B(temperature), C(Density), D(total # of molecules), E(total # of atoms) of the system.

36.  Which one is NOT an electrolyte?
A(Baking Soda), B(Table Sugar), C(Ethyl Alchol), D(Sulfuric Acid), E(A & B), F(B & C).

37. What is the normal oxidation state for K?   A(0), B(1), C(2), D(3), E(4).

38 Which one is a good oxidizing agent?    A(H 2O), B(NaCl), C(NaClO), D(MgO), E(Zn).

39. A commercial bleaching solution is  6.0% by mass in NaClO.  Find the  molarity of NaClO,  assuming a density of the solution is 1.0g/mL.
A(0.2), B(0.6), C(0.8), D(1.0), E(1.2) M.

40.  Answer one out of four. Encircle the Question Number of your choice.

(1) A solution with an unknown amount of HCl required 9.35 mL of 0.101 M NaOH to be neutralized. What is a mass of the HCl? A(34.5µg), B(3.45mg), C(34.5mg), D(345mg), E(345g).

(2). A 5.00g sample of vinegar required 39.4 mL of 0.108 M NaOH for complete reaction. Find the mass % of acetic acid(HC2H 3O2). Acetic acid react with NaOH in 1 to 1 molar ratio. A(5.07%), B(5.09%), C(5.11%), D(5.13%), E(5.15%).

(3)  You wish to determine the mass % of Ca in a sample of limestone which is mostly CaCO3. A weighing 128.3mg is dissolved in HCl which gives a solution of CaCl2, then Ca2+ ion are precipitated by adding sodium oxalate(Na2C2 O 4). 139.0 mg of CaC2O4 (the precipitate is obtained. Find the mass %. A(32.59%), B(32.92%), C(33.90%), D(34.19%), E(35.72%).

(4) Balance the following redox reaction with the smallest integers in which ethanol is oxidized to acetic acid .
This is the breath-analyzer reaction used in detecting ahcohols of  a drunken driver:
( )C2H5OH + ( )Cr2O72- (orange) + ( )H+     --- >     ( )CH3COOH + ( )Cr3+ (green) + ( )H2O
The coefficient for ethanol must be A(1), B(2), C(3), D(4), E(5).


KEY

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Updated (10/3/2001, MHK)