Lichter CHM1045 Quizzes (4A-4E) (Spring 2012)

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Chapter 4 Quiz

Review of attempt 1

Finish review Started on Tuesday, 14 February 2012, 08:20 PM

Completed on Wednesday, 15 February 2012, 08:23 PM

Time taken 1 day

Grade 0 out of a maximum of 10 (0%)

Question1 Marks: 1

A sample conaining both HCl and HNO3 had a density of 1.083g/ml. A 17.00 ml amountof this sample required 30.96 ml of 0.3745 M NaOH for titration. Another 17.00 mlamount of this sample required 6.56 ml of 0.1254 M AgNO3 for titration. Calculate themass percent of HNO3 (molar mass = 63.018 g/mol) in the sample.

Answer Format: 0.11

Answer:

In this case, first calculate total moles of acid, then the moles of acid due to HCl andsubtract to obtain HNO3. This is converted to mass of HNO3 and then divided by samplemass and multiplied by 100 to obtain percentage.IncorrectMarks for this submission: 0/1.

Question2 Marks: 1

Which of the following sets of reactants would yield a precipitate when mixed together?Select all that are correct.

Choose one answer.

a. NaNO3 + AgCH3CO2

b. KClO4 + (NH4)2CO3



c. magnesium nitrate with lithium chloride

d. Na2SO4 + KCH3CO2

e. MgCl2 + Na2S

IncorrectMarks for this submission: 0/1.

Question3 Marks: 1


Choose at least one answer.

a. Na2S + LiOH

b. Mixing sodium carbonate with magnesium nitrate

c. Pb(CH3CO2)2 and KClO4

d. Mixing magnesium acetate with ammonium sulfide

e. HNO3 + MgCl2


Question4 Marks: 1

Which of the following salts would cause a precipitate to form with a solution containingbromide ions? Select all that apply


a. Hg2(NO3)2

b. Hg(NO3)2

c. NaCH3CO2

d. Ba(NO2)2

e. AgClO3




Question5 Marks: 1

What is the oxidation number of Cl in the compound NaClO2?

Choose one answer.

a. +3

b. -1

c. +1

d. -2

e. +2

Incorrect

Marks for this submission: 0/1.

Question6 Marks: 1

Which of the following reactions is/are a redox reaction? Select all that apply. Thereactions are not necessarliy balanced!


a. Cu(NO3)2 + Pb (s) --> Cu (s) + Pb (NO3)2

b. Pb (NO3)2 + HBr --> PbBr 2 (s) + HNO3 (aq)

c. Mn2+ + PbO2 --> Pb2+ + MnO4-

d. 2 HNO3 + Na2O --> 2 H2O + 2 NaNO3

e. Ag+

+ NaCl --> AgCl (s) + Na+


Question7

Marks: 1

Which of the following would be products of the reaction between HNO3 and Ba(OH)2?


a. BaNO3



b. BaOH+

c. H2O

d. HBa

e. Ba(NO3)2


Question8 Marks: 1

In the reaction:

Ba(NO3)2 + Na2SO4 -->

Which ions would be the spectator ions that would be eliminated in the net ionicequation?

Choose one answer.

a. Ba2+

and Na+

b. Ba2+ and SO42-

c. Na+ and NO3-

d. Na+ and SO4-

e. SO4- and NO3

-


Question9 Marks: 1

Oxalic acid (H2C2O4) is a useful primary standard for standardizing solutions such aspotassium permanganate (KMnO4). In a particular standardization experiment 47.00g ofoxalic acid, is titrated with 480.00mL of permangante solution. What was the

concentration (mol/L) of the permanganate solution?

Submit answers correct to two decimal places.

Answer:



Calculate moles of oxalic acid, use stoiciometry to calculate the moles ofpermanganate, and divide this by the volume of permanganate solution to obtainmolarity.IncorrectMarks for this submission: 0/1.

Question10 Marks: 1

When the body metabolizes glucose water and carbon dioxide are produced accordingto the following equation.

C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

If 3.566 g of glucose are metabolized with excess oxygen, how many grams of waterare produced?

Answer:


Chapter 4 Quiz

Review of attempt 2

Finish review

Started on Wednesday, 15 February 2012, 08:23 PM

Completed on Wednesday, 15 February 2012, 08:53 PM

Time taken 29 mins 10 secs


Question1 Marks: 1

Determine the concentration of 245mL of lead nitrate (Pb(NO3)2 if the sample reactsexactly with 221.8mL of 0.37M potassium iodide (KI).



Sample answer: 0.111M

Answer:0.167 M

Determine the number of moles of potassium iodide. Since two moles of potassiumiodide react exactly with one mole of lead nitrate you must divide this value by two toobtain the moles of lead nitrate. Once you have the moles of lead nitrate, this is dividedby the volume of the lead nitrate sample to obtain a concentration.IncorrectMarks for this submission: 0/1.

Question2 Marks: 1

Determine the total number of moles of solid sodium hydroxide required to react with276.00mL of 0.1500M phosphoric acid (H3PO4

Answer:

Convert mL to L.Use liters and concentration to determine the moles of phosphoricacid.Since the reaction requires three moles of sodium hydroxide per mole ofphosphoric acid, multiply by threeIncorrectMarks for this submission: 0/1.

Question3 Marks: 1



a. Na2S + LiOH

b. Mixing sodium carbonate with magnesium nitrate

c. Pb(CH3CO2)2 and KClO4

d. Mixing magnesium acetate with ammonium sulfide

e. HNO3 + MgCl2


Question4 Marks: 1



What is the oxidation number of Cr in the compound K2Cr2O7?

Choose one answer.

a. +3

b. +4

c. +5

d. +6

e. +7


Question5

Marks: 1


Choose one answer.

a. +3

b. -1

c. +1

d. -2

e. +2


Question6 Marks: 1





c. Mn2+ + PbO2 --> Pb2+ + MnO4-



d. 2 HNO3 + Na2O --> 2 H2O + 2 NaNO3

e. Ag+ + NaCl --> AgCl (s) + Na+

Partially correctMarks for this submission: 0/1.

Question7 Marks: 1

Which of the following statements is/are true?

i. NaCl is a strong electrolyteii. since HCl is not a salt, it isnot an electrolyte.iii. CH3OH is not an electrolyte

Choose one answer.

a. i only is true

b. ii only is true

c. iii only is true

d. i and ii are true

e. i and iii are true

CorrectMarks for this submission: 1/1.

Question8 Marks: 1

Which of the following would be products of the reaction between HClO 4 and Mg(OH)2?Select all that apply.


a. MgCl2

b. Mg(ClO4)2

c. MgClO4

d. H2O

e. HCl

Correct




Question9 Marks: 1

In the reaction:

AgNO3 + HCl -->

which ions would be the spectator ions?

Choose one answer.

a. Ag+ and H+

b. Ag+ and NO3-

c. H+ and Cl-

d. H+ and NO3-

e. Ag+ and Cl-


Question10 Marks: 1

When the body metabolizes glucose water and carbon dioxide are produced according

to the following equation.

C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

If 0 g of glucose are metabolized with excess oxygen, how many grams of carbondioxide are produced?

Answer:0


Finish review

Chapter 4 Quiz



Review of attempt 3

Finish review

Started on Thursday, 16 February 2012, 09:36 AM

Completed on Thursday, 16 February 2012, 10:12 AM



Question1

Marks: 1

This problem describes a gravimetric titration in which the mass of titrant is measuredinstead of the volume. A solution of NaOH was standardized by titration of a knownquantity of the primary standard potassium hydrogen phthalate (KHP) which has aformula of KC8H5O4:

The NaOH was then used to find the concentration of an unknown solution of H2SO4.

Titration of 0.7g of KHP required 24.09g of NaOH solution to reach the endpointdetected by phenolphthalein indicator. Determine the concentration of NaOH expressedas mol NaOH/kg solution. A 12mL sample of H2SO4 was found to require 41.69g of theNaOH solution to reach the phenolphthalein end point. Find the molarity of the H2SO4.

Answer Format: 0.11

Answer:

With this problem you must first determine the concentration of NaOH in mol of

NaOH/Kg of solution. You then use this value in the second part of the calculation.IncorrectMarks for this submission: 0/1.

Question2 Marks: 1

Determine the concentration of 216mL of lead nitrate (Pb(NO3)2 if the sample reactsexactly with 198.1mL of 0.216M potassium iodide (KI).




Answer:0.099 M


Question3 Marks: 1

Which of the following reagents could be used to separate the two anions in a solutionof sodium sulfide and sodium acetate? Select all that apply.


a. sodium chloride

b. magnesium chloride

c. potassium chloride

d. sodium acetate

e. copper(II) chloride


Question4 Marks: 1

Which of the following salts would cause a precipitate to form with a solution containingcarbonate ions? Select all that apply


a. NH4Cl

b. MgCl2

c. NaClO3

d. Fe(NO3)3



e. NaCl


Question5 Marks: 1


Choose one answer.

a. +3

b. -1

c. +1

d. -2

e. +2


Question6 Marks: 1



a. ZnCl2 + AgNO3 --> AgCl(s) + Zn(NO3)2

b. HCl + NaOH --> NaCl + H2O

c. Zn (s) + Cu(NO3)2 --> Zn(NO3)2 + Cu (s)

d. AgNO3 + HCl --> AgCl (s) + HNO3

e. Mn + + ClO3---> MnO2 + ClO2


Question7 Marks: 1




i. NaCl is a strong electrolyteii. since HCl is not a salt, it isnot an electrolyte.iii. CH3OH is not an electrolyte

Choose one answer.

a. i only is true

b. ii only is true

c. iii only is true



Correct


Question8 Marks: 1

Determine the total concentration (in mol/L) of Ba2+ ions in a solution formed from thereaction of 199mL of 0.6M barium hydroxide (Ba(OH)2 with 500mL of 1.0M hydrochloricacid (HCl).

Answer:

Convert mL to L.Use liters and concentration to determine the moles of barium

hydroxide.Since one mole of barium hydroxide gives one mole of barium ions, wesimply divide the moles of barium ions by the total volume to obtain the concentration.IncorrectMarks for this submission: 0/1.

Question9 Marks: 1

Oxalic acid (H2C2O4) can be used to standardize potassium permanganate solution in aredox titration. If 8.66g of oxalic acid (MM = 90.036g/mol) are carefully weighed out andtitrated to equivalence with 62.99mL of potassium permanganate solution, what is theconcentration of the permanganate solution.

Answer:



Convert mass of oxalate to moles of oxalate.Use stoichiometric coefficients to obtainmoles of permanganate.Use volume of permanganate solution (in liters) to determinemolarity of permanganate solution.IncorrectMarks for this submission: 0/1.

Question10 Marks: 1


C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

If 11.626 g of glucose are metabolized with excess oxygen, how many grams of carbondioxide are produced?

Answer:11.626


Chapter 4 Quiz

Review of attempt 4

Finish review

Started on Thursday, 16 February 2012, 05:45 PM

Completed on Thursday, 16 February 2012, 06:29 PM



Question1 Marks: 1

This problem describes a gravimetric titration in which the mass of titrant is measuredinstead of the volume. A solution of NaOH was standardized by titration of a known



quantity of the primary standard potassium hydrogen phthalate (KHP) which has aformula of KC8H5O4:

The NaOH was then used to find the concentration of an unknown solution of H2SO4.

Titration of 0.59g of KHP required 22.82g of NaOH solution to reach the endpointdetected by phenolphthalein indicator. Determine the concentration of NaOH expressedas mol NaOH/kg solution. A 4mL sample of H2SO4 was found to require 52.17g of theNaOH solution to reach the phenolphthalein end point. Find the molarity of the H2SO4.

Answer Format: 0.11

Answer:

With this problem you must first determine the concentration of NaOH in mol ofNaOH/Kg of solution. You then use this value in the second part of the calculation.IncorrectMarks for this submission: 0/1.

Question2 Marks: 1

Determine the concentration of 242.6mL of lead nitrate (Pb(NO3)2 if the sample reactsexactly with 157.9mL of 0.307M potassium iodide (KI).


Answer:0.199 M


Question3 Marks: 1





a. sodium chloride



d. sodium acetate



Question4 Marks: 1

Which of the following salts would cause a precipitate to form with a solution containingcarbonate ions? Select all that apply


a. NH4Cl

b. MgCl2

c. NaClO3

d. Fe(NO3)3

e. NaCl


Question5 Marks: 1


Choose one answer.

a. +3

b. -1

c. +1

d. -2

e. +2




Question6 Marks: 1





c. Mn+

+ PbO2 --> Pb+

+ MnO4-

d. 2 HNO3 + Na2O --> 2 H2O + 2 NaNO3

e. Ag+ + NaCl --> AgCl (s) + Na+


Question7 Marks: 1


i. NaCl is a strong electrolyte

ii. since HCl is not a salt, it isnot an electrolyte.iii. CH3OH is not an electrolyte

Choose one answer.

a. i only is true

b. ii only is true

c. iii only is true




Question8 Marks: 1



Which of the following answers contains at least one strong base and one strong acid?

Choose one answer.

a. KOH, NH3, NaNH2

b. NH4+Cl, NH3, HNO3

c. LiNH2, CH3COOH, and NaOH

d. KNH2, Na2O, and HI

e. NH4+, HClO, and NaCHO2


Question9

Marks: 1

Which of the following statements is/are correct?

i. KBr, HClO3, and HClO2 are strong acidsii. NaH, KOH, and Li2O are strong basesiii. HI, HClO3, and HNO3 are strong acids

Choose one answer.

a. i only

b. ii only

c. ii and iii are true




Question10 Marks: 1


C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O



If 0 g of glucose are metabolized with excess oxygen, how many grams of carbondioxide are produced?

Answer:0


Chapter 4 Quiz

Review of attempt 5

Finish review

Started on Monday, 23 April 2012, 01:23 PM

Completed on Monday, 23 April 2012, 01:53 PM



Question1 Marks: 1

Determine the total concentration (in mol/L) of hydrogen ions in 233mL or 0.59Mphosphoric acid (H3PO4). To simplify this problem, assume that phosphoric acid is astrong electrolyte.

Answer:

Convert mL to L.Use liters and concentration to determine the moles of phosphoricacid.Since there are three moles of hydrogen ions per mole of phosphoric acid, multiply

by three.Divide this number by the total volume (in liters) to obtain concentration.IncorrectMarks for this submission: 0/1.

Question2 Marks: 1

Determine the total number of moles of solid sodium hydroxide required to react with359.00mL of 0.6500M phosphoric acid (H3PO4



Answer:700.05

Convert mL to L.Use liters and concentration to determine the moles of phosphoricacid.Since the reaction requires three moles of sodium hydroxide per mole ofphosphoric acid, multiply by threeIncorrectMarks for this submission: 0/1.

Question3 Marks: 1



a. sodium chloride



d. sodium acetate



Question4 Marks: 1

Which of the following salts would cause a precipitate to form with a solution containingbromide ions? Select all that apply


a. Hg2(NO3)2

b. Hg(NO3)2

c. NaCH3CO2

d. Ba(NO2)2

e. AgClO3




Question5 Marks: 1


Choose one answer.

a. +3

b. -1

c. +1

d. -2

e. +2

Correct


Question6 Marks: 1

In general, what are the products when an acid and a base react.

Answer:salt and water


Question7 Marks: 1

Which of the following would be products of the reaction between HNO 3 and Ba(OH)2?


a. BaNO3

b. BaOH+

c. H2O

d. HBa

e. Ba(NO3)2




Question8 Marks: 1

In the reaction:

Ba(NO3)2 + Na2SO4 -->

Which ions would be the spectator ions that would be eliminated in the net ionicequation?

Choose one answer.

a. Ba2+ and Na+

b. Ba2+ and SO42-

c. Na+

and NO3-

d. Na+ and SO4-

e. SO4- and NO3

-


Question9 Marks: 1

Which of the following statements is/are correct?

i. KBr, HClO3, and HClO2 are strong acidsii. NaH, KOH, and Li2O are strong basesiii. HI, HClO3, and HNO3 are strong acids

Choose one answer.

a. i only

b. ii only

c. ii and iii are true




Question10



Marks: 1


C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

If 11.505 g of glucose are metabolized with excess oxygen, how many grams of waterare produced?

Answer:6.9


Lichter CHM1045 Quizzes (4A-4E) (Spring 2012)

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