Search found 21 matches

by JD Malana
Mon Jul 31, 2017 10:18 pm
Forum: Calculating the pH of Salt Solutions
Topic: Video on Acidic, Basic, Neutral Salts
Replies: 2
Views: 340

Video on Acidic, Basic, Neutral Salts

Hi guys,
I found a video that illustrates how salts form acids and bases. Hope this helps!
https://www.youtube.com/watch?v=1Nq4-fV_bss
by JD Malana
Sun Jul 30, 2017 5:28 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa vs Ka
Replies: 3
Views: 358

Re: pKa vs Ka

Just as pH is a simpler way of understanding the concentration of hydronium ions, pK's are simpler way of understanding the equilibrium constants of weak acids or bases.
by JD Malana
Sun Jul 30, 2017 3:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1012029

Re: Post All Chemistry Jokes Here

-an inspired breakfast whilst studying for the final
IMG_0008.JPG
by JD Malana
Mon Jul 24, 2017 10:03 pm
Forum: Naming
Topic: Names of Ligands
Replies: 1
Views: 194

Names of Ligands

Will we be expected to memorize the names of all the ligands in the course reader?
by JD Malana
Sun Jul 23, 2017 11:47 pm
Forum: Lewis Structures
Topic: Formula for # electrons using Pi-bonds
Replies: 1
Views: 407

Formula for # electrons using Pi-bonds

Hi guys, just wanted to share a formula for figuring out how many pi-bonds must be used in a molecule and it goes like this: P(# of electrons that will use pi-bonds) = 6N + 2 - V where N is the number of individual atoms in the molecule, excluding Hydrogens and V is the total number of valence elect...
by JD Malana
Sat Jul 22, 2017 10:52 pm
Forum: Lewis Structures
Topic: 10, 12, or more electrons in extended octet?
Replies: 1
Views: 266

10, 12, or more electrons in extended octet?

How do we know if an element that can have an expanded octet will have 10, 12, or more electrons in that octet?
by JD Malana
Sat Jul 22, 2017 10:37 pm
Forum: Ionic & Covalent Bonds
Topic: Oxygen compounds (-ite vs. -ate)
Replies: 2
Views: 563

Re: Oxygen compounds (-ite vs. -ate)

Wait, correction: I read online that all -ate's have 3 oxygens except for sulfate and phosphate, which have 4 oxygens.
Furthermore, -ite's are all one less oxygen than the corresponding -ate so sulfite and phosphite will have 3 oxygens.
by JD Malana
Sat Jul 22, 2017 10:31 pm
Forum: Ionic & Covalent Bonds
Topic: Oxygen compounds (-ite vs. -ate)
Replies: 2
Views: 563

Oxygen compounds (-ite vs. -ate)

I know the suffixes -ite and -ate mean that a molecule is an oxygen compound (such as sulfite and sulfate) and that -ite's have the lesser amount of oxygen atoms between the two but how do we know how many oxygen's are involved? Is there a specific method to figuring that out?
by JD Malana
Sun Jul 16, 2017 11:30 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 2
Views: 348

Re: Formal Charge

Is it possible that two different arrangements have the same formal charge? In that case, would either arrangement suffice?
by JD Malana
Sun Jul 16, 2017 11:24 pm
Forum: Lewis Structures
Topic: Seesaw Structure question
Replies: 3
Views: 580

Re: Seesaw Structure question

So basically we should check if any other arrangement would put more space between the electrons than the one we come up with? And if there are none then it's good?
by JD Malana
Sun Jul 16, 2017 11:14 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Relationship between Electronegativity and Orbital Energy
Replies: 4
Views: 880

Re: Relationship between Electronegativity and Orbital Energy

Can you apply the same logic to a relationship between electronegativity and atomic size? As in would more electronegative atoms be smaller in size?
by JD Malana
Sun Jul 16, 2017 11:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-sh aped
Replies: 1
Views: 222

Re: T-sh aped

T-shaped molecular geometry refers to AX3E2 in AXE notation meaning three bonding pairs around a central atom while also being repelled by two lone pairs.
by JD Malana
Sun Jul 09, 2017 7:24 pm
Forum: Einstein Equation
Topic: How does E = hv lead to Einsteins equation E=MC2?
Replies: 4
Views: 993

Re: How does E = hv lead to Einsteins equation E=MC2?

I think the equations E=hv (mu) and E=mc 2 may be solving for two different energies. E=hv refers to the energy of a photon with respect to Planck's and frequency E=mc 2 uses the mass of an object and the speed of light. The first relates the energy of a photon (which doesn't have mass) while the se...
by JD Malana
Sun Jul 09, 2017 7:14 pm
Forum: Photoelectric Effect
Topic: Example 1.5
Replies: 3
Views: 393

Re: Example 1.5

Does anyone know if 10-9 m and nm will be interchangeable?
by JD Malana
Sun Jul 09, 2017 7:09 pm
Forum: Photoelectric Effect
Topic: Energy in kj or j when solving a problem?
Replies: 10
Views: 571

Re: Energy in kj or j when solving a problem?

I agree. Also, I would just set up the problem in the standard units of measurement (J for energy, nm for wavelength, etc.) to avoid multiple conversions down the road.
by JD Malana
Sun Jul 09, 2017 7:04 pm
Forum: Properties of Light
Topic: Ch1 problem9
Replies: 3
Views: 298

Re: Ch1 problem9

LOL the dedication^ but sweet, this clarification really helped me out too. But also, during the exam would it be advisable to convert all our wavelength numbers to nanometers?
by JD Malana
Tue Jul 04, 2017 2:37 am
Forum: Balancing Chemical Reactions
Topic: Example H.1
Replies: 3
Views: 425

Example H.1

In the third step of balancing the equation for the combustion of C 6 H 14 + O 2 > CO 2 + H 2 O, the final balanced equation is C 6 H 14 + 19/2 O 2 > 6 CO 2 + 7 H 2 O... Why/how is the fractional coefficient used for O 2 19/2? Is there a specific method/formula for determining what fractions to use?
by JD Malana
Fri Jun 30, 2017 6:01 pm
Forum: Properties of Electrons
Topic: Clarification on "ground state"
Replies: 2
Views: 333

Clarification on "ground state"

In class today we learned about electrons moving from one energy level to another while also using the terms "ground state" and "excited state" Dr. Lavelle referred to energy level N=1 as the ground state, but, just to clarify, the ground state is just the energy level an electro...
by JD Malana
Fri Jun 30, 2017 5:55 pm
Forum: Einstein Equation
Topic: Where does Planck's Constant Come From
Replies: 5
Views: 383

Re: Where does Planck's Constant Come From

Kinda cool how scientists have discovered such an "unspeakably small" constant as my TA would describe it...even more amazing that such a minute constant was observed rather than arbitrarily chosen, meaning that there are relationships between things in the universe that actually rest upon...
by JD Malana
Fri Jun 30, 2017 5:45 pm
Forum: Properties of Electrons
Topic: Diffraction experiment for electron
Replies: 2
Views: 284

Re: Diffraction experiment for electron

I think the question meant to ask what characteristics* of a crystal cause electrons to diffract. I'm not entirely sure, but I think it's not so much that crystals have unique properties that make them refract photons and electrons-it's more that electrons just have less mass than the atoms in a cry...
by JD Malana
Fri Jun 30, 2017 5:28 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1012029

Re: Post All Chemistry Jokes Here

What did the chemist say when he found 2 isotopes of Helium?
HeHe

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