Question

Anyone that is willing to give this a shot is much appreciated since i understand that this takes a minutes with the multiple parts to each question, but with that said I have a test tomorrow and this is what i understand the least off of it I have my own answers to this portion of the study guide but need something to compare them to. PLEASE take your time and be as descriptive as you can be, it is more than appreciated. THANK YOU!!!

1. Writing and Balancing Equations. Write the balanced chemical reaction for each of the following.

On the line, identify the kind of reaction. Your choices are: Combination, Decomposition, Combustion, Precipitation, Neutralization, Oxidation/Reduction.

___________________ a) The complete combustion of butyric acid, HC4H7O2, a compound produced when butter becomes rancid.

___________________ b) Al(s) combines with iodine solid.

___________________ c) PbCO3(s) decomposes to give lead(II) oxide and carbon dioxide.

_______________ d) Write the balanced MOLECULAR… include the states of products, IONIC… circle spectators, and NET-IONIC Reactions.

Pb(NO3)2(aq) + KI(aq) --->

________________e) Write the balanced MOLECULAR… label the acid as strong or weak…. label the base as strong or weak, IONIC… circle spectators, and NET-IONIC Reactions.

  H3PO4(aq) + NaOH(aq) ---->

______________ f) The reaction that occurs between Fe(NO3)2(aq) and Al(s). What element is oxidized? What element is reduced? What is the oxidation number of the N in Fe(NO3)2? Be sure your work supports your answers.

g) You know that an unlabeled bottle contains a solution of one of the following: AgNO3, CaCl2, or Al2(SO4)3. A friend suggests that you test a portion of the solution with Ba(NO3)2 and then with NaCl solutions. So you find a test tube, add some unknown to the test tube, add some Ba(NO3)2 solution to that test tube, and then add some NaCl solution to the same test tube. Explain how this would be sufficient to determine which salt is present in the solution.

Answer 1

a.HC4H7O2 +5 O2 -----> 4CO2 + 4H2O

b. 2Al (s) + 3I2(s) ------> 2AlI3(s)

c. c) PbCO3(s) decomposes to give lead(II) oxide and carbon dioxide

PbCO3 -----> PbO + CO2

d.Pb(NO3)2(aq) + KI(aq) ---> PbI2(s) + 2KNO3(aq)

ionic equation

.Pb⁺²(aq)+2(NO3)^-(aq) + 2K⁺(aq) + 2I^-(aq) ---> PbI2(s) + 2K⁺ (aq) + 2NO3^-(aq)

Removal of spectator ions

Pb⁺²(aq) + 2I^-(aq) ------>PbI2(s) net ionic equation

e. H3PO4(aq) + 3NaOH(aq) ----> Na3PO4(aq) + 3H2O(l)

ionic equation

3H⁺(aq) + PO4^3-(aq) + 3Na⁺(aq)+ 3OH^-(aq) ----> 3Na⁺(aq) + PO4^3-(aq) + 3H2O(l)

Removal of spectator ions

3H⁺(aq) +3OH^-(aq -----> H2O(l) net ionic equation

Fe(NO3)3 + Al -----> Al(NO3)3 + Fe

iron oxidation number decreases from +3 tp 0 . So it is reduction reaction . iron reducing agent.

Al oxidation number increases from 0 to +3. So it is oxidation . Al act as oxidizing agent.