Search found 25 matches

by Arie Hakimi 1L
Sat Mar 18, 2017 3:28 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Naming Order (Iso)
Replies: 1
Views: 719

Naming Order (Iso)

Is the prefix "iso" included if we are listing a name alphabetically?

For example, would a molecule be called:

1,1-dimethyl-2-isopropyl-cyclopentane
OR
2-isopropyl-1,1-dimethyl-cyclopentane

In the solutions manual it states that the second way of writing it is correct.
by Arie Hakimi 1L
Tue Mar 14, 2017 9:58 pm
Forum: Photoelectric Effect
Topic: Possible Future Class Demo [ENDORSED]
Replies: 1
Views: 480

Possible Future Class Demo [ENDORSED]

@Professor Lavelle, I just stumbled across this and thought it would be a cool short demo to describe the photoelectric effect. Check out this video: https://www.youtube.com/watch?v=wlZGHvhxrgI In theory, a red laser pointer should cause a lesser glow in the dark effect, as opposed to a green or vio...
by Arie Hakimi 1L
Sun Mar 12, 2017 7:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 20227

Re: Quiz 3 Winter 2017

will the answers to the quiz be posted?
by Arie Hakimi 1L
Thu Mar 09, 2017 10:47 pm
Forum: General Science Questions
Topic: DNA
Replies: 1
Views: 503

DNA

Just out of curiosity, is DNA considered one gigantic organic molecule? How exactly would we classify something as complex as DNA... as in what are the limits to naming certain molecules?
by Arie Hakimi 1L
Thu Feb 23, 2017 1:01 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: How can we calculate the pH of a solution if we dilute with water?
Replies: 1
Views: 1446

How can we calculate the pH of a solution if we dilute with water?

How can we calculate the pH of a solution if we dilute with water?

For example, if we assume that we have a weak monoprotic acid (pKa = 5.76, Ka= 1.74x10-6),

How would we calculate the pH after we take a 5 mL sample of 0.010 M weak acid, and dilute it with 45 mL of water?
by Arie Hakimi 1L
Tue Feb 14, 2017 4:03 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Electroplating
Replies: 2
Views: 452

Electroplating

How exactly does what we have learned in class relate to electroplating?

How would it work in terms of Copper and an acid?
by Arie Hakimi 1L
Tue Feb 14, 2017 3:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: What's the difference between a Galvanic and Voltaic Cell?
Replies: 1
Views: 521

What's the difference between a Galvanic and Voltaic Cell?

What's the difference between a Galvanic and Voltaic Cell?

Are both simply terms to express the same concept?
by Arie Hakimi 1L
Thu Feb 02, 2017 8:06 pm
Forum: Calculating Work of Expansion
Topic: Amount of work done
Replies: 2
Views: 451

Amount of work done

Do our values calculated for work grant the maximum theoretical value one can get or simply a guaranteed value that is experimentally tested, and could be replicated?
by Arie Hakimi 1L
Thu Jan 26, 2017 8:18 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Graph
Replies: 2
Views: 447

Re: Graph

Pretty helpful to visualize this. Thanks
by Arie Hakimi 1L
Thu Jan 19, 2017 8:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 2
Views: 392

Modules

Will there be any modules on the Chem 14B website (similar to how they were in Chem 14A)?
by Arie Hakimi 1L
Tue Nov 29, 2016 9:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Composition and ICE tables
Replies: 1
Views: 416

Re: Equilibrium Composition and ICE tables

K is the general term for equilibrium, and the subscript determines the type of equilibrium. The equilibrium concentration (K c ) basically determines the concentration(mol/L or M) values of any given reactant or product. If K>1, then the concentration of products is higher than reactants, since Kc=...
by Arie Hakimi 1L
Mon Nov 28, 2016 11:42 pm
Forum: Ideal Gases
Topic: Gas Constant Conversion Factors
Replies: 1
Views: 544

Gas Constant Conversion Factors

Can someone explain how the gas constant (R) 8.206x10-2L*atm*K-1*mol-1 is converted to 8.206x10-5m3atm*K-1*mol-1?

Or in other words, whats the relation between 1 Liter (L) and 1 meter^3 (m3)
by Arie Hakimi 1L
Mon Nov 28, 2016 9:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: If the concentration of a reactant and product do not change with time, will their ratio change with time? [ENDORSED]
Replies: 1
Views: 303

If the concentration of a reactant and product do not change with time, will their ratio change with time? [ENDORSED]

If the concentration of a reactant and product do not change with time, will their ratio change with time?

Would anyone be able to state and explain their answer? I'm a little confused about this.
by Arie Hakimi 1L
Mon Nov 28, 2016 9:41 pm
Forum: Conjugate Acids & Bases
Topic: General Question Regarding Acids/Bases [ENDORSED]
Replies: 1
Views: 332

General Question Regarding Acids/Bases [ENDORSED]

Is a strong acid such as pure HCl technically considered non-acidic when it is not associated with water or other compounds?
Does HCl only become acidic when it comes into contact with water since that is the point in time at which HCl gives off a H+ ion?
by Arie Hakimi 1L
Tue Nov 22, 2016 7:00 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxoacids
Replies: 2
Views: 503

Re: Oxoacids

ClOH is more acidic than IOH because Cl has a higher electronegativity than I, and as a result is able to stabilize the molecule better.
by Arie Hakimi 1L
Sun Nov 13, 2016 4:55 pm
Forum: Administrative Questions and Class Announcements
Topic: When will the detailed midterm answers be released?
Replies: 2
Views: 1833

When will the detailed midterm answers be released?

In class, Professor Lavelle said that he will be releasing the answers to the midterm. Does anyone know if/where he has posted them?

Thanks
by Arie Hakimi 1L
Sat Nov 12, 2016 2:07 pm
Forum: Naming
Topic: Monodentate vs. Polydentate [ENDORSED]
Replies: 1
Views: 323

Monodentate vs. Polydentate [ENDORSED]

What is the most efficient way to differentiate between mono- and poly- dentate by only looking at the chemical name of the compound?
by Arie Hakimi 1L
Tue Nov 01, 2016 10:02 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 5
Views: 616

Re: Polarity

You have to draw the VSEPR model and figure out the molecular shape of the molecule. After that, you determine the dipole moments based on the electronegativity of the different atoms (the atom with higher electronegativity pulls electrons towards itself \delta - ). Typically, if there are different...
by Arie Hakimi 1L
Sun Oct 30, 2016 10:32 pm
Forum: Dipole Moments
Topic: Polar and Non-polar bond
Replies: 8
Views: 1262

Re: Polar and Non-polar bond

Do you guys know if we will have to memorize the exact electronegativity values for the main elements or can we just determine polarity by assuming trends in electronegativity to be true
by Arie Hakimi 1L
Sun Oct 23, 2016 4:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi Bonds
Replies: 2
Views: 491

Sigma and Pi Bonds

What exactly are Sigma and Pi bonds?

For our Quiz #2 preparation (fall 2014), the first question states:

How many sigma and how many pi bonds are present in H3CCHCHCH2OH?

how would we calculate the number of sigma/pi bonds?
by Arie Hakimi 1L
Sun Oct 16, 2016 3:38 pm
Forum: Einstein Equation
Topic: General Question about Joules [ENDORSED]
Replies: 7
Views: 844

General Question about Joules [ENDORSED]

So, I understand that a Joule is a measure of energy. 1 Joule is also equal to 1 kg*m^2/s^2, but what exactly does this mean? Just from looking at it, I would assume that 1 Joule of energy is the equivalent force to accelerate 1 kg for 1 meter (?), but if anyone knows the true definition of a Joule ...
by Arie Hakimi 1L
Thu Oct 06, 2016 8:00 pm
Forum: Significant Figures
Topic: Quiz 1 Prep Fall 2014 #9 [ENDORSED]
Replies: 2
Views: 565

Re: Quiz 1 Prep Fall 2014 #9 [ENDORSED]

From the information you have given us, your answer seems to have to correct amount of sig-figs.
by Arie Hakimi 1L
Mon Sep 26, 2016 8:44 pm
Forum: Significant Figures
Topic: Easy Way to Calculate Sigfigs
Replies: 6
Views: 1069

Re: Easy Way to Calculate Sigfigs

If a value has decimals that are zeroes (such as 1500.00), would that be considered having a decimal present or absent? If your value is 1500.00, the decimal is present and the full value is used to show that your answer is significant (i.e. if your value was 1499.996 prior to rounding, and the que...

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