## Search found 25 matches

Sun Jul 30, 2017 1:37 pm
Forum: Conjugate Acids & Bases
Topic: Question 12.3
Replies: 2
Views: 456

### Re: Question 12.3

Yes, it is required to write the state of matter that the components are in. Usually, the solvent will be written as a liquid and the other substances are aqueous because they are mixed with the water.
Sun Jul 30, 2017 1:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: calculating K
Replies: 2
Views: 237

### Re: calculating K

I think it just depends on what unit the question is asking for.
Sun Jul 30, 2017 1:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8040
Views: 1411441

### Re: Post All Chemistry Jokes Here

Q: What is the chemical formula for "banana"?
A: BaNa2
Fri Jul 28, 2017 4:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.33
Replies: 4
Views: 599

### Re: 11.33

You divide the moles by 0.500 because you need to find the concentration of the various gases by using: concentration = moles/volume (liters).
Fri Jul 28, 2017 10:08 am
Forum: Naming
Topic: Naming Ligands
Replies: 2
Views: 523

### Re: Naming Ligands

You only add "ion" when naming a ligand that is a coordinate covalent compound by itself as an ion without binding to a respective anion or cation.
For example, [Co(NH3)5Cl]+ would be labeled as pentaamminechlorocobaltate(II) ion.
Fri Jul 28, 2017 10:03 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Course Reader Example on Pg. 154
Replies: 2
Views: 332

### Re: Course Reader Example on Pg. 154

As Dr. Lavelle stated, the negative charge of the oxygen is stabilized more with the chlorine atoms in the compound because chlorine is a very electronegative atom.
Fri Jul 28, 2017 9:58 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: homework 12.39
Replies: 1
Views: 352

### Re: homework 12.39

Two criteria that you can use to determine the relative acidity of acidic compounds is by looking at the length of the bonds and the stability of the resulting anion after the H+ atom is removed.
Fri Jul 21, 2017 10:22 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8040
Views: 1411441

### Re: Post All Chemistry Jokes Here

What is the chemical formula for "coffee"?

CoFe2
Fri Jul 21, 2017 10:17 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 2
Views: 358

### Re: Lewis Structure

The order of the atoms in the molecular compound can also aid in the formation of the Lewis structure. For example, the COOH at the end of the formula illustrates that there will be a carboxylic acid attached to the nitrogen.
Fri Jul 21, 2017 10:14 pm
Forum: Lewis Structures
Topic: double bonds
Replies: 2
Views: 323

### Re: double bonds

For an atom such as Oxygen and Sulfur, a double bond is sometimes needed in order to satisfy a full bond and to achieve a 0 (most stable) formal charge.
Fri Jul 21, 2017 10:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exercise 3.13
Replies: 2
Views: 452

### Re: Exercise 3.13

a) 4s
b) 3p
c) 3p
d) 4s
Sun Jul 16, 2017 8:10 am
Forum: Lewis Structures
Topic: Octet Rule [ENDORSED]
Replies: 9
Views: 1009

### Re: Octet Rule[ENDORSED]

Another exception would be when when an atom has too little electrons in a compound. BeCl2, for example, is a compound in which the central atom does not possess an octet.
Sun Jul 16, 2017 8:05 am
Forum: Lewis Structures
Topic: Question 3.39
Replies: 1
Views: 307

### Re: Question 3.39

For the compounds that you listed in the problem, the cation is always written first whereas the anion is written second. When writing the anion, replace the end of the anion with the suffix, -ide. For example, chlorine would be written as chloride. For organic compounds such as CH4 or Methane, ther...
Sat Jul 15, 2017 8:53 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 2.47
Replies: 3
Views: 564

### Re: Problem 2.47

Be sure that when removing electrons, the electrons from the ns state are removed first before removing those from the (n-1)d state. (e.g. 4s state electrons before 3d electrons)
Sat Jul 15, 2017 8:37 am
Forum: Ionic & Covalent Bonds
Topic: Polyatomic Lewis Structures
Replies: 5
Views: 797

### Re: Polyatomic Lewis Structures

If a molecule has a charge of 3+, it means that the molecule has 3 less electrons than it normally does. This would mean that you use 3 electrons less on the diagram than you would if you were drawing the ground state diagram. On the other hand, if a molecule were to have a 3- charge, then it would ...
Tue Jul 11, 2017 3:55 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Problem
Replies: 1
Views: 313

### Re: Photoelectric Effect Module Problem

1. Use 194 nm, convert it to meters, and solve for frequency using c=wavelength x frequency 2. Use E=hv and solve for the energy. This energy is the energy of a photon that is radiated onto the surface 3. Next, use the formula E(kinetic) = E(photon) - E(threshold) to solve for the kinetic energy Sin...
Tue Jul 11, 2017 3:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Text Book Problem 2.29 (d)
Replies: 3
Views: 491

### Re: Text Book Problem 2.29 (d)

The question is asking about how many electrons can have the quantum number of n=2, meaning the 2nd shell. Since the 2nd shell possesses only s and p subshells, those subshells are the only ones that can have the number n=2. We learned that s- subshells have one orbital and that each orbital can hol...
Fri Jul 07, 2017 10:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra & Energy Levels
Replies: 2
Views: 426

### Re: Atomic Spectra & Energy Levels

In a mathematical sense, the limit of the function $\frac{1}{n}$ as n approaches infinity is 0 (same principle applies for $\frac{1}{n^{2}}$), so the energy (E) value will go to 0 when n approaches infinity.
Fri Jul 07, 2017 10:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: True Or False??
Replies: 2
Views: 428

### Re: True Or False??

Wu is correct. When electrons in an atom move from a higher state to a lower one (when electromagnetic radiation is emitted), they emit energy; and thus, the energy of the atom does not increase but rather decreases. On the other hand, the energy of an atom increases when it absorbs electromagnetic ...
Fri Jul 07, 2017 10:07 pm
Forum: Properties of Light
Topic: Chapter 1, problem 3 [ENDORSED]
Replies: 10
Views: 895

### Re: Chapter 1, problem 3[ENDORSED]

I believe you are correct in that the speed of light is a constant so it should be the same for all photons regardless of the frequency. However, the case would be different with particles that have rest mass as De Broglie's equation includes velocity to solve for the wavelength of a particle, which...
Wed Jul 05, 2017 11:31 pm
Forum: Student Social/Study Group
Topic: Self Test 1 Answers
Replies: 8
Views: 1020

### Re: Self Test 1 Answers

Ben's answer for number 5 is correct. Dr. Lavelle used C3HO4 as an example in the post when he divided the respective number of moles by the lowest value of moles.
Thu Jun 29, 2017 11:13 pm
Forum: Empirical & Molecular Formulas
Topic: How can we write the molecular formulas of some organic chemicals?
Replies: 3
Views: 452

### Re: How can we write the molecular formulas of some organic chemicals?

Additionally, the order that the respective elements are given in a molecular formula gives insight on the specific formation that the atoms are placed in.
Wed Jun 28, 2017 5:19 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question on Problem E.1 in textbook [ENDORSED]
Replies: 2
Views: 342

### Re: Question on Problem E.1 in textbook[ENDORSED]

You would need to find the diameter of the atoms instead of the circumference because the question is asking for the length of the stringed atoms, which is found by adding the diameters, and not the circumference of all the atoms.
Wed Jun 28, 2017 5:16 pm
Forum: Properties of Light
Topic: energy required to remove an electron [ENDORSED]
Replies: 7
Views: 1656

### Re: energy required to remove an electron[ENDORSED]

The energy required to remove an electron is the value of sodium's work function, so the value would be 150.6 kj/mol.
Wed Jun 28, 2017 5:09 pm
Forum: Properties of Light
Topic: When using the constant C
Replies: 2
Views: 336

### Re: When using the constant C

Dr. Lavelle said that he rounded the value of the speed of light (c) to 3.00x10^8 in his lecture slide, so I would assume that it would be okay to use the value.

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