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Fe Exam Study Guide

Jacob Said:

Quick Chem Questions - FInal Exam tomorrow -PLEASE?

We Answered:

H2SO4 + 2NaOH >> Na2SO4 + 2H2O E is the answer

Moles HSO3NH2 = 0.179 g / 97.1 = 0.00184 => moles KOH
M = 0.00184 / 0.0194 L = 0.0950 M

P goes from +3 to +5 and Cl from 0 to -1
Cu goes from 0 to +2 and Ag from +1 to 0
I and II

Katie Said:

Balancing equations???!!!?

We Answered:

First of all, there's no such thing as Cu(SO4)2 or HSO. Please check this, because the equation cannot be balanced the way it's written.

In the second equation, it would typically be written as Fe(OH)3, not Fe(HO)3. Not a big deal, I guess, but just something I noticed.

Fe(NO3)3 + NaOH --> Fe(OH)3 + NaNO3

There are three nitrate ions on the left side but only one on the right. We can fix that by placing a coefficient of 3 in front of NaNO3.

Fe(NO3)3 + NaOH --> Fe(OH)3 + 3NaNO3

Also, there are three sodium ions and three hydroxide ions on the right side, but only one of each on the left. Fix this by placing a 3 in front of NaOH, and you're done:

Fe(NO3)3 + 3NaOH --> Fe(OH)3 + 3NaNO3

*****

Zn + HNO3 --> Zn(NO3)2 + NH4NO3 + H2O

The best way to balance this reaction is to use the half-reaction method. Zinc is being oxidized from Zn to Zn^+2, so:

Zn --> Zn^+2 + 2 e-

Nitrogen is being reduced from +5 in HNO3 to -3 in the NH4^+1 ion:

10 H^+1 + NO3^-1 + 8 e- --> NH4^+1 + 3 H2O

Multiply the oxidation half-reaction by 4 so the number of electrons balances:

4 Zn --> 4 Zn^+2 + 8 e-

10 H^+1 + NO3^-1 + 8 e- --> NH4^+1 + 3 H2O

Now recombine the half-reactions, canceling out the 8 electrons on each side:

4 Zn + 10 H^+1 + NO3^-1 --> 4 Zn^+2 + NH4^+1 + 3 H2O

And replace the spectator ions:

4 Zn + 10 HNO3 --> 4 Zn(NO3)2 + NH4NO3 + 3 H2O

I hope that helps. Good luck!

Leon Said:

doing my take home exam study guide and i need help please?

We Answered:

a, b, a

Casey Said:

Taking and passing the EIT/FE exam?

We Answered:

The FE exam is "open book", but all test takers are only allowed to use the official "FE Reference Manual" during the test. You can buy one ahead of time, but a "clean" one will be lent to you at the time of the test. It should be the only one you need, but search the web and observe reviews for the best fit.

Your experience will help during your Professional Engineering Exam, but not so much on the FE, because the FE is more like a comprehensive final exam on general topics. What I mean is the FE has quick questions about pure math and pure science (derivatives or integrals, statistics, etc.), chemistry (balancing equations, reactions), physics (force, momentum, energy), electricity, thermal science, statics and dynamics. If you're good at math and have studied most of the other subjects, then you should do fine.

My only other advice is:

1. Verify with your State Board that a const. tech. degree, passing the FE and 4 years experience will let you be eligible for the PE exam.

2. Research or contact a few structural engineering companies to see if a construction technology degree (even with passing the FE & PE) meets their hiring requirements. It would not be good for you to pass all the tests and then have companies say they can't hire you because of "the rules".

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