April 28, 2024, 01:44:10 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Two Weird Questions  (Read 9008 times)

0 Members and 1 Guest are viewing this topic.

Offline bdtgat

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Two Weird Questions
« on: August 22, 2013, 01:53:51 AM »
Hello Everyone. Could you please help me answer these two questions? Please explain your answers. These questions are incredibly vague.

1. Most of Chemistry can be understood using which of the following Laws?
A. Electrostatics (Coulombs Law)
B. String Theory
C. Mechanics (Newtons Laws)
D. Quantum Field Theory
E. Electrodynamics (Maxwell's Equations)

I know String Theory and Mechanics are probably not the right answers, so I'm kinda stuck between answer choices A, D, and E. I'm leaning toward A, but I'm really not sure. Could someone please explain this?

2. Which of the following should be shown in an ionic equation as a MOLECULE or a COMPLETE FORMULA rather than as separate ions?

A. NH4Cl (soluble, Cl is a halide)
B. HNO3 (Nitrate is always soluble)
C. NaOH (OH is insoluble, but Na is a Group1 element, which is a soluble exception)
D. K2Cr2O7 (Cr2O7 is insoluble, but K is a Group 1 element- soluble exception)
E. Fe(NO3)3 (Nitrate is always soluble)
F. CH3COOH (Acetate is always soluble)
G. MgCl2 (Chlorine is a halide so its soluble)
H. No other Answer is correct; all substances are written as ions in an ionic equation.
I. Ba(OH)2 (OH is insoluble, but Ba is a soluble exception)

I answered with H first, and then I, but both were wrong for some reason.

I'm assuming one of other answer choices must be slightly soluble, or one of them is an exception, or the question itself could be wrong... Then again, I could be wrong.
« Last Edit: August 22, 2013, 05:06:39 AM by bdtgat »
Logged

Offline Archer

  • Chemist
  • Sr. Member
  • *
  • Posts: 1001
  • Mole Snacks: +85/-20
  • Gender: Male
Re: Two Weird Questions
« Reply #1 on: August 22, 2013, 02:03:26 AM »
They are not vague, they are multiple choice so the answer is already there.

Forum rule is that you must at least attempt the questions

See http://www.chemicalforums.com/index.php?topic=65859.0 for more detail.
Logged
“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.

Offline bdtgat

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Re: Two Weird Questions
« Reply #2 on: August 22, 2013, 02:13:39 AM »
I modified my post. I did try to answer these questions.
Logged

Offline Archer

  • Chemist
  • Sr. Member
  • *
  • Posts: 1001
  • Mole Snacks: +85/-20
  • Gender: Male
Re: Two Weird Questions
« Reply #3 on: August 22, 2013, 02:43:45 AM »
1) give us more detail of each law and why this does or does not apply in your opinion.

2) This question is asking which one is a molecule (covalent bonding) and which ones are ionic (ionic bonding)
Logged
“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.

Offline bdtgat

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Re: Two Weird Questions
« Reply #4 on: August 22, 2013, 03:02:37 AM »
To Archer:

1. I have never studied physics so I don't know anything for sure about the laws, but I know electrostatics has to do with electrical charges.
2. Is CH3COOH a molecule (covalently bonded)?

To everyone else: Please someone that knows something about physics help me with #1.
Logged

Offline bdtgat

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Re: Two Weird Questions
« Reply #5 on: August 22, 2013, 03:03:52 AM »
String Theory has to do with the belief that the universe is made of strings or something.
Mechanics is like physical forces?
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27665
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Two Weird Questions
« Reply #6 on: August 22, 2013, 04:14:19 AM »
Quote from: bdtgat on August 22, 2013, 03:03:52 AM
String Theory has to do with the belief that the universe is made of strings or something.

Yes.

http://en.wikipedia.org/wiki/String_theory

Hint: check the image on the right (the one described as levels of magnification). Does the shape of a single sand grain matter when it comes to shape and properties of Hoover Dam?

Quote
Mechanics is like physical forces?

More or less. Again, the very first phrase from

http://en.wikipedia.org/wiki/Mechanics

explains what mechanics is about.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Archer

  • Chemist
  • Sr. Member
  • *
  • Posts: 1001
  • Mole Snacks: +85/-20
  • Gender: Male
Re: Two Weird Questions
« Reply #7 on: August 22, 2013, 04:19:54 AM »
Quote from: bdtgat on August 22, 2013, 03:02:37 AM
To Archer:

2. Is CH3COOH a molecule (covalently bonded)?


Correct, you may have a mole snack! But does it ionise readily? What sort of molecule has COOH in it?

Try writing each answer for question 1 into Google and adding the word "chemistry" after each one. Maybe that will guide you in some way?

P.S.

Quote

To everyone else: Please someone that knows something about physics help me with #1.


Thank you for your confidence in my knowledge of physics, this could be interpreted as not very polite but I suspect it is just a poor choice of words  ;). I have studied Physics and I know the answer. I am trying to help you establish deep learning techniques rather than surface learning and spoon feeding.


« Last Edit: August 22, 2013, 04:41:30 AM by Archer »
Logged
“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.

Offline Archer

  • Chemist
  • Sr. Member
  • *
  • Posts: 1001
  • Mole Snacks: +85/-20
  • Gender: Male
Re: Two Weird Questions
« Reply #8 on: August 22, 2013, 04:45:01 AM »
Quote from: bdtgat on August 22, 2013, 01:53:51 AM

2. Which of the following should be shown in an ionic equation as a MOLECULE or a COMPLETE FORMULA rather than as separate ions?

A. NH4Cl (soluble, Cl is a halide)
B. HNO3 (Nitrate is always soluble)
C. NaOH (OH is insoluble, but Na is a Group1 element, which is a soluble exception)
D. K2Cr2O7 (Cr2O7 is insoluble, but K is a Group 1 element- soluble exception)
E. Fe(NO3)3 (Nitrate is always soluble)
F. CH3COOH (Acetate is always soluble)
G. MgCl2 (Chlorine is a halide so its soluble)
F. No other Answer is correct; all substances are written as ions in an ionic equation.
G. Ba(OH)2 (OH is insoluble, but Ba is a soluble exception)

I answered with F first, and then G, but both were wrong for some reason.


which F & G did you provide for your answer?

There are two of each in this question as posted.
Logged
“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.

Offline bdtgat

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Re: Two Weird Questions
« Reply #9 on: August 22, 2013, 05:06:09 AM »
To Archer:

1. I truly apologize for my earlier comment about the physics question. I never intended it in a negative or disrespectful manner :P I really phrased it incorrectly. Honestly, its just that I really don't know where to start because I really have no knowledge of any of those concepts other than what was on wikipedia. Again Archer, I can't reemphasize how wrongly I phrased the question. I was frustrated by this question; I just didn't know what to do.
But
I did look on wikipedia from your and Borek's Suggestions, and I thought it was Electrostatics, electrodynamics or Quantum Field Theory.
As far as I know, Electrostatics has to do with magnetism and electrical charges, which sort of seems right. However, it also apparently has to do with slow moving or stationary electrical charges, which then makes me want to change my mind about that answer choice. I don't think molecules are "slow moving."
I think Quantum Field Theory has to do with subatomic particles, which also seemed right.
Lastly, I read that Electrodynamics has to with electrodynamic forces, but again the description was a little vague and too complex for me to understand completely  :P
So I'm stuck between these answer choices. Could you give me another hint?

Secondly
2. I answered with the "second" pair of F&G: ("No other answer choice is correct...) and (BaOH)2
I apologize for my mistake. I just realized :P
I thought the CH3COOH was initially an ionic bond between CH3COO- and H+. I looked it up and now I'm pretty sure that it is the answer. Thanks Archer and sorry again!
Logged

Offline Archer

  • Chemist
  • Sr. Member
  • *
  • Posts: 1001
  • Mole Snacks: +85/-20
  • Gender: Male
Re: Two Weird Questions
« Reply #10 on: August 22, 2013, 05:44:14 AM »
I was being facetious, I know you meant no offence. It was not my intention to make you feel bad.

You have given three viable options; Electrostatics, electrodynamics or Quantum Field Theory.

Looking at these three possibilities, one deals with more sub-atomic particles (more of the atom) than the other two, therefore must cover more chemical understanding.

Look at what each of them covers in that sense and I am sure you will get there.
« Last Edit: August 22, 2013, 06:55:35 AM by Archer »
Logged
“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.
Pages: [1]   Go Up
« previous next »
Sponsored Links