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Too many questions here OXIDATION REDUCTION,balanced equations

Submitted by horribleatchem on Fri, 10/19/2007 - 19:59

I know this is a lot of work.. but I honestly have NO CLUE how to do these. I did the ones I can, and these are the ones I have left. I looked at examples int he book, and tried to look for help online. but I have no other choices left.

1.  Which of the following ionic compounds are soluble in water?
Soluble Insoluble Calcium carbonate
Soluble Insoluble Lead(II) iodide
Soluble Insoluble Sodium sulfide
Soluble Insoluble Barium sulfate
Soluble Insoluble Lead(II) nitrate
Tries 0/5   

 

 

2. Determine net ionic equations, if any, occuring when aqueous solutions of the following reactants are mixed.
Select "True" or "False" to indicate whether or not the stated reaction (or "no reaction") correctly corresponds to the expected observation in each case.

True False Lead(II) nitrate and sodium chloride; Pb 2+ (aq) + 2Cl - (aq)  PbCl 2 (s)
True False Calcium acetate and sodium carbonate; Ca 2+ (aq) + CO 3 2- (aq)  CaCO 3 (s)
True False Sodium bromide and hydrochloric acid; No reaction occurs.
True False Nickel(II) chloride and lead(II) nitrate; Pb 2+ (aq) + 2Cl - (aq)  PbCl 2 (s)
True False Ammonium sulfate and barium nitrate; No reaction occurs.

 

3.

Select the correct, balanced molecular equation from the list (A - J), for each of the suggested reactions.

A B C D E F G H I J MnSO 4 (aq) + NaOH (aq) 

A B C D E F G H I J HNO 3 (aq) + KOH (aq) 

A B C D E F G H I J Ni(OH) 2 (s) + HCl (aq) 

A.    H + (aq) + OH - (aq)  H 2 O (l) 
B.    Ni(OH) 2 (s) + 2HCl (aq)  NiCl 2 (s) + 2H 2 O (l) 
C.    Mn 2+ (aq) + 2OH - (aq)  Mn(OH) 2 (s) 
D.    Ni(OH) 2 (s) + 2HCl (aq)  NiCl 2 (aq) + 2H 2 O (l) 
E.    Ni 2+ (aq) + 2HCl (aq)  NiCl 2 (s) + 2H + (aq) 
F.    MnSO 4 (aq) + 2NaOH (aq)  Mn(OH) 2 (aq) + Na 2 SO 4 (aq) 
G.    HNO 3 (aq) + OH - (aq)  H 2 O (l) + NO 3 - (aq) 
H.    no reaction 
I.    MnSO 4 (aq) + 2NaOH (aq)  Mn(OH) 2 (s) + Na 2 SO 4 (aq) 
J.    none of the above 

 

 

4. Assign formal oxidation numbers to the specified atoms in the following compounds, according to convention. The choices are -8 to +8.

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The S atom in SF 6
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The O atom in K 2 Cr 2 O 7
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The C atom in CCl 4
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The Cl atom in KClO 4
Tries 0/5   

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The P atom in H 3 PO 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The O atom in KMnO 4
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The N atom in NH 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The H atom in HSO 4 -
Tries 0/5   

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The F atom in PF 5
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The N atom in HNO 2
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The Cl atom in KClO 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The Si atom in SiF 4
Tries 0/5   

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The S atom in SO 3 2-
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The O atom in H 2 SO 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The K atom in K 2 Cr 2 O 7
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The H atom in HNO 2
Tries 0/5   

 

5. Assign formal oxidation numbers to the specified atoms in the following compounds, according to convention. It goes from -8 to +8.

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The P atom in H 3 PO 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The N atom in NO
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The N atom in NH 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The K atom in K 2 Cr 2 O 7
Tries 0/5   

-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The S atom in Na 2 SO 4
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The P atom in Na 3 PO 3
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The H atom in HNO 2
-8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 The F atom in AlF 3
Tries 0/5 

 

6. Select the correct net-ionic equation from the list (A - J) for each of the reactions, in aqueous medium.

A B C D E F G H I J Ni (s) reduces Sn 2+ (aq)

A B C D E F G H I J Co 2+ (aq) oxidizes Mg (s)

A B C D E F G H I J Cd 2+ (aq) oxidizes Zn (s)

A.    Mg (s) + Co 2+ (aq)  Mg 2+ (aq) + Co (s) 
B.    Zn 2+ (aq) + Cd (s)  Zn (s) + Cd 2+ (aq) 
C.    Mg (s) + Co 2+ (aq) + H 2 O (l)  Mg 2+ (aq) + Co (s) + H 2 (g) + 2OH - (aq) 
D.    Sn (s) + Ni 2+ (aq)  Sn 2+ (aq) + Ni (s) 
E.    Zn (s) + Cd 2+ (aq)  Zn + (aq) + Cd + (aq) 
F.    Cd 2+ (aq) + Zn (s)  Cd (s) + Zn 2+ (aq) 
G.    Mg 2+ (aq) + Co (s)  Mg (s) + Co 2+ (aq) 
H.    Sn 2+ (aq) + Ni (s)  Ni 2+ (aq) + Sn (s) 
I.    Co (s) + Mg 2+ (aq)  Mg (s) + Co 2+ (aq) 
J.    none of the above 

 

7. Select the correct net-ionic equation from the list (A - J) for each of the reactions, in aqueous medium.

A B C D E F G H I J Zn (s) reduces Fe 2+ (aq)

A B C D E F G H I J Mn (s) reduces Zn 2+ (aq)

A B C D E F G H I J Co (s) reduces Sn 2+ (aq)

A.    Zn (s) + Fe 2+ (aq) + 2H + (aq)  Zn 2+ (aq) + Fe (s) + H 2 (g) 
B.    Sn (s) + Co 2+ (aq)  Co (s) + Sn 2+ (aq) 
C.    Sn 2+ (aq) + Co (s)  Sn (s) + Co 2+ (aq) 
D.    Zn (s) + Fe 2+ (aq)  Zn 2+ (aq) + Fe (s) 
E.    Fe (s) + Zn 2+ (aq)  Fe 2+ (aq) + Zn (s) 
F.    Mn (s) + Zn 2+ (aq)  Mn + (aq) + Zn + (aq) 
G.    Zn 2+ (aq) + Mn (s)  Mn 2+ (aq) + Zn (s) 
H.    Co 2+ (aq) + Sn (s)  Co (s) + Sn 2+ (aq) 
I.    Co (s) + Sn 2+ (aq) + H 2 O (l)  Co 2+ (aq) + Sn (s) + H 2 (g) + 2OH - (aq) 
J.    none of the above 

 

8.  Which of the following are oxidation-reduction reactions?
Correct Incorrect Fe(s) + 2AgNO 3 (aq)  ® Fe(NO 3 ) 2 (aq) + 2Ag(s)
Correct Incorrect Ni(OH) 2 (s) + 2HCl(aq)  ® NiCl 2 (aq) + 2H 2 O(l)
Correct Incorrect N 2 O 4 (l) + 2N 2 H 4 (l)  ® 3N 2 (g) + 4H 2 O(g)
Correct Incorrect NH 3 (aq) + H 2 O(l)  ® NH 4 + (aq) + OH ? (aq)
Correct Incorrect Zn(s) + 2HCl(aq)  ® ZnCl 2 (aq) + H 2 (g)

 

9. What mass of solid potassium oxalate (K 2 C 2 O 4 ), when dissolved in an acidic solution, would be titrated by exactly 25.0 mL of 0.0388 M potassium permanganate (KMnO 4 ) solution?

(Mn 2+ ions and carbon dioxide are produced in the reaction.) 


sorry you have to abide by the forum rules...ask one or two at a time and tell us your thinking on them and we will be glad to help you


It appears your learning about sreactions in aqueous solutions, in you text you will find tables, such as

Solubility Table
Rules for assigning oxidation number

The key to using these these two charts is use the rules "in order" If the stated rule does not apply, then move to the next.

They're in the text, that why they make you buy one.