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May 23, 2015

May 23, 2015

Posted by **hope** on Saturday, October 9, 2010 at 10:04pm.

LiOH + C2H5COOH ® C2H5COOLi + H2O

What is the concentration of the base solution?

0.08313 M

0.1663 M

0.3325 M

0.6650 M

Question 2 4.2 points Save

Balance the following net ionic equation. What is the sum of the coefficients?

MnO4- + I- + H2O I2 + MnO2 + OH-

21

23

25

27

29

Question 3 4.2 points Save

Balance the following equation. How many HCl are there on the left side of the balanced equation?

K2Cr2O7 + Na2SO3 + HCl KCl + Na2SO4 + CrCl3 + H2O

1

2

3

4

8

Question 4 4.2 points Save

What is the coefficient of NaCl in the balanced formula unit equation?

NaClO3 + H2O + I2 HIO3 + NaCl

1

2

3

4

5

Question 5 4.2 points Save

Iron(II) ions reduce dichromate ions in acidic solution to chromium(III) ions and form ferric ions. Write the balanced net ionic equation. Use H+ rather than H3O+. What is the sum of all the coefficients?

24

26

28

32

36

Question 6 4.2 points Save

What volume of 0.122 M HCl would react with 26.2 mL of 0.176 M NaOH?

37.8 mL

18.2 mL

5.56 mL

26.3 mL

75.6 mL

Question 7 4.2 points Save

What is the molarity of a K2Cr2O7 solution if 20.0 mL of the solution requires 60.4 mL of 0.200 M KI solution for complete reaction?

K2Cr2O7 + KI + H+ Cr3+ + I2 + H2O (unbalanced)

1.55 M

3.63 M

0.101 M

0.603 M

0.280 M

Question 8 4.2 points Save

A 25.0-mL sample of 0.0833 M NaClO3 reacted with 30.0 mL of an aqueous solution of I2. How many grams of I2 were contained in the I2 solution?

NaClO3 + H2O + I2 HIO3 + NaCl (unbalanced)

0.264 g

0.397 g

0.236 g

0.159 g

0.317 g

Question 9 4.2 points Save

What volume of 0.50 M KOH would be required to neutralize completely 500. mL of 0.25 M HPO solution?

2.5 ´ 10 mL

1.4 ´ 10 mL

83 mL

7.5 ´ 102 mL

5.2 ´ 102 mL

Question 10 4.2 points Save

What volume of 0.1125 M K2Cr2O7 would be required to oxidize 48.16 mL of 0.1006 M Na2SO3 in acidic solution? The products include Cr3+ and SO42- ions.

14.36 mL

28.75 mL

43.12 mL

56.12 mL

32.15 mL

Question 11 4.2 points Save

Balance the following equation. How many H+ are there in the balanced equation?

(COOH)2 + MnO4- + H+ CO2 + Mn2+ + H2O

6

2

3

4

8

Question 12 4.2 points Save

How many grams of glucose, C6H12O6, are needed to make 5.00 L of 5.00 M solution?

0.139 g

4500. g

600. g

180 g

7.2 g

Question 13 4.2 points Save

What is the molarity of a sulfurous acid solution if 23.7 mL of this H2SO3 solution requires 16.8 mL of 0.296 M NaOH for titration to the equivalence point?

0.210 M

0.358 M

0.105 M

0.421 M

0.0525 M

Question 14 4.2 points Save

How many H2O are there in the balanced equation?

CuS + NO3- + H+ Cu2+ + S + NO + H2O

one

two

three

four

five

Question 15 4.2 points Save

What is the molarity of the NaBr produced when 50.0 mL of 4.80 M NaOH is mixed with 150.0 mL of 1.60 M HBr?

2.40 M

3.20 M

1.20 M

1.33 M

480 M

Question 16 4.2 points Save

Write the balanced net ionic half-reaction for the reduction of MnO4- to Mn2+ in acidic solution. What is the sum of the coefficients (including the electrons.)

22

19

8

14

15

Question 17 4.2 points Save

What mass of molybdenum(III) oxide, Mo2O3, will be completely oxidized to potassium molybdate, K2MoO4, by 35.0 mL of 0.200 M KMnO4?

3MnO4- + 5Mo3+ + 8H2O 3Mn2+ + 5MoO42- + 16 H+

8.40 g

4.20 g

1.40 g

2.80 g

6.40 g

Question 18 4.2 points Save

What is the oxidation number of arsenic in H2AsO4-2?

+1

+2

+3

+4

+5

Question 19 4.2 points Save

What is the oxidation number of arsenic in K3AsO4?

+1

+2

+3

+4

+5

Question 20 4.2 points Save

What is the formula and molarity of the salt produced by the reaction of 17 mL of 0.33 M H2SO4 and 44 mL of 0.23 M Sr(OH)2?

SrSO4, 0.0920 M

SrSO4, 0.16 M

Sr(OH)2, 0.165 M

SrSO4, 9.2 ´ 10-5 M

SrH2, 0.0920 M

Question 21 4.2 points Save

If 35 mL of 2.0 M H2SO4 is mixed with 35 mL of 1.0 M NaOH, how many moles of H2SO4 remain after completion of the reaction?

0.070

0.035

0.0175

0.0525

zero

Question 22 4.2 points Save

What is the molarity of a phosphoric acid solution if 15.66 mL of this H3PO4 solution requires 43.81 mL of 0.2283 M NaOH for titration to the equivalence point?

1.925 M

0.1597 M

0.3193 M

0.2129 M

0.6387 M

Question 23 4.2 points Save

What is the molarity of a potassium hydroxide solution if 38.65 mL of the KOH solution is required to titrate 25.84 mL of 0.1982 M hydrochloric acid solution?

0.1325 M

0.2963 M

0.8817 M

0.2648 M

0.01324 M

Question 24 4.2 points Save

Balance the following net ionic equation. Use H+ rather than H3O+. What is the coefficient of H2O?

C + H+ + SO42- CO2 + SO2 (acidic solution)

1

2

3

4

5

Question 25 4.2 points Save

Balance the following net ionic equation. Use H+ rather than H3O+. What is the coefficient of H2S?

H2S + MnO4- SO42- + Mn2+ (acidic solution)

1

2

- chemistry -
**bobpursley**, Saturday, October 9, 2010 at 10:26pmI am wondering why anyone would do your test for you. This is a teaching,assistance site.

- chemistry -
**hope**, Saturday, October 9, 2010 at 10:34pmplease help me out

- chemistry -
**Anonymous**, Thursday, February 17, 2011 at 4:26pmWhat volume of 0.1125 M K2Cr2O7 would be required to oxidize 48.16 mL of 0.1006 M Na2SO3 in acidic solution? The products include Cr3+ and SO42- ions.

- chemistry -
**chriis**, Wednesday, February 29, 2012 at 8:50pmhow much are college teachers teaching chemistry?

- chemistry -
**shayla**, Thursday, April 12, 2012 at 6:05pmquestion 12. answer is d