General Chemistry I

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Test 2 Name___________________________________

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq) C. MgCl2(aq) + K2CO 3 (aq) D. CaSO4 (aq) + (NH4)3 PO4(aq)

1)

A) A

B) C

C) B

D) D 2)

2) The balanced molecular equation for complete neutralization of H2 SO4 by KOH in aqueous solution is __________. A) 2H+ (aq) + 2OH- (aq)
2H2O (l)

B) H2 SO4 (aq) + 2KOH (aq) C) H2 SO4 (aq) + 2OH- (aq) D) 2H+ (aq) + 2KOH (aq) E) H2 SO4 (aq) + 2KOH (aq)

2H2 O (l) + K2SO4 (s) 2H2 O (l) + SO42- (aq) 2H2O (l) + K2 SO4 (aq)

2H2O (l) + 2K+ (aq)

3) How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide? A) 1.08 × 1023 B) 1.00 × 1024 C) 1.08 × 1024 D) 6.02 × 1024 E) 6.02 × 1023

3)

1

ESSAY. Write your answer in the space provided or on a separate sheet of paper. 4) Which element is oxidized and which element is reduced in the following reaction? Slect your reaction

Zn(s) + 2 HCl(aq) Zn is oxidized (0 Fe2O 3(s) + 2 Al(s) Fe is reduced (3+

ZnCl 2(aq) + H 2(g) 2+) and H is reduced (+1 ÷ 0) 2 Fe(s) + Al2O 3(s) 0) and Al is oxidized (0 ÷ 3+)

14 HNO3 + 3 Cu2O 6 Cu(NO3)2 + 2 NO + 7 H2O N is reduced (5+ 2+) and Cu is oxidized (1+ ÷ 2+) I–– + 2 MnO4– + H2O IO3– + 2 MnO 2 + 2 OH–– I is oxidized (1–– 5+) and Mn is reduced (7+ ÷ 4+)

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 5) Which one of the following is a correct expression for molarity? A) mol solute/mL solvent B) mol solute/kg solvent C) mmol solute/mL solution D) mol solute/L solvent E) µmol solute/L solution 6) Which one of the following is a weak acid? A) HI B) HNO3 C) HClO4 7) The mass % of F in the binary compound KrF2 is __________. A) 68.80 B) 81.52 C) 45.38 5)

D) HF

E) HCl

6)

7) D) 31.20 E) 18.48 8)

8) When aqueous solutions of __________ are mixed, a precipitate forms. A) K2 SO4 and CrCl3 B) NiBr2 and AgNO3 C) NaI and KBr D) Li2CO3 and CsI E) KOH and Ba(NO3)2

2

9) In the reaction 2 A + 3 B the limiting reagent? A) B C) A

products, if you have 0.500 mol A and 0.500 mol B, which is

9)

B) Insufficient information D) nither

ESSAY. Write your answer in the space provided or on a separate sheet of paper. 10) Pentacarbonyliron (Fe(CO)5 ) reacts with phosphorous trifluoride (PF3) and hydrogen, releasing carbon monoxide: Fe(CO)5 + 2PF3 + H2 Choose your numbers Fe(CO)2 (PF3 )2 (H)2 + 3CO

g of given

x

1 mole og given --mole of asked grams of asked x x molar mass of given -- mole of given moles of asked

How many grams of Fe(CO)5 are required to produce 30 .00 g of CO 30 .00 g of CO x

196.35g Fe(CO)5 1 mole Fe(CO)5 1 mole CO x x =69.88 g 28.01 g CO 3 mole of CO 1 moleFe(CO)5

How many grams of PF3 are required to produce 30 g of CO 30 .00 g of CO x

87.97 g PF3 2 mole PF3 1 mole CO = 62.81 g x x 28.01 g CO 3 mole of CO 1 molePF3

How many grams of H2 30 .00 g of CO x

are required to produce 30 g of CO

2.016 g H2 1 mole H2 1 mole CO x x = 0.7197g 28.01 g CO 3 mole of CO 1 moleH2

How many grams of Fe(CO)5 are required to produce 27 g of CO 27.00 g of CO x

196.35g Fe(CO)5 1 mole Fe(CO)5 1 mole CO = 62.95 x x 28.1 g CO 3 mole of CO 1 moleFe(CO)5

3

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 11) Which of the following is soluble in water at 25°C? A) FeS B) Fe(NO3)2 C) FeCO3 D) Fe(OH)2 E) Fe3(PO4 )2 11)

12) Which one of the following substances is the product of this combination reaction? Al (s) + I2 (s) __________

12)

A) AlI3

B) Al2 I3

C) AlI

D) AlI2

E) Al3 I2

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 13) A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. The empirical formula for this compound is __________...
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