Search found 20 matches

by kara_kremer_2N
Mon Mar 06, 2017 9:03 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Mechanisms
Replies: 1
Views: 315

Re: Organic Reaction Mechanisms

If you look at a PEDD diagram(graph), the energy in the transition state is always higher than the reactants. This means that from the reactants to the transition state, \Delta G standard will always be positive and unfavorable. If this were not the case, the transition state would not be the transi...
by kara_kremer_2N
Mon Mar 06, 2017 8:56 pm
Forum: *Cycloalkenes
Topic: Naming Techniques
Replies: 1
Views: 234

Re: Naming Techniques

I would draw it out completely, this helps me. When drawing it out, try to make straight lines of all the possible parent chains and find th longest one. Numbering the carbons helps too
by kara_kremer_2N
Fri Mar 03, 2017 2:36 pm
Forum: *Cycloalkanes
Topic: Common Names
Replies: 3
Views: 389

Re: Common Names

When carbon chains are in the specific compositions mentioned in the course reader, the substituent is given an iso- prefix. In any other arrangement, iso- is not included in naming. For example, -< this skeletal structure substituent would be named isopropyl. Basically iso- is used when the middle ...
by kara_kremer_2N
Wed Feb 22, 2017 10:22 pm
Forum: General Rate Laws
Topic: Half Life Equation graph
Replies: 1
Views: 208

Re: Half Life Equation graph

Only the integrated rate law will be linear. Half life is never linear. You only plot the rate law to determine which order it is.
by kara_kremer_2N
Fri Feb 10, 2017 8:23 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 2
Views: 290

Re: Oxidation Numbers

All elements have a zero oxidation charge All molecules have the charge specified (some you may have to memorize) Group 1 elements are always +1 Group 2 elements are usually +2 Chalcogens are usually -2 Halogens are usually -1 The charges of the ions have to equal the charge of the total molecule
by kara_kremer_2N
Fri Feb 03, 2017 3:28 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.43
Replies: 2
Views: 350

Re: 9.43

At constant pressure, use Cvln (T2/T1) and S tot= kBln W1W2

T=Tfinal-Tinitial
by kara_kremer_2N
Sun Jan 29, 2017 7:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question on Units of Temperature
Replies: 4
Views: 369

Re: Question on Units of Temperature

When there is a temperature change of 1 degree Celsius, there's also a temperature change of 1 degree Kelvin (and vice versa). This means they're interchangeable (one-to-one conversion).
by kara_kremer_2N
Thu Jan 19, 2017 5:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Practice Quizzes
Replies: 3
Views: 377

Re: Practice Quizzes

Not anymore
by kara_kremer_2N
Fri Jan 13, 2017 7:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.65
Replies: 3
Views: 264

Re: Problem 8.65

the desired reaction is: N2(g)+5/2 O2(g)--> N2O5(g)
Divide the second reaction by 2 and add the first and second together to get: 2 NO(g)+3/2 O2(g)--> N2O5(g) with an enthalpy of-169.2 kJ.

Then calculate the standard enthalpy of formation
by kara_kremer_2N
Tue Nov 29, 2016 4:57 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers 1 and 2
Replies: 1
Views: 290

Re: Quantum Numbers 1 and 2

As energy levels increase, the gap between them decreases
by kara_kremer_2N
Mon Nov 28, 2016 2:31 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH and Ionization percentage
Replies: 1
Views: 241

Re: Calculating pH and Ionization percentage

To find the percentage of ionization in acetic acid, you have to find the concentration of H3O+ because you have to see how much acetic acid dissociates (ionizes). By finding this concentration, you know what percentage of acetic acid ionized into H3O+. The pH is -log [H3O+]
by kara_kremer_2N
Fri Nov 18, 2016 9:15 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted acid and bases
Replies: 1
Views: 289

Re: Bronsted acid and bases

In this case, H2O is the Broasted-Lowry base because it accepts an H+ (which is basically a proton)
by kara_kremer_2N
Wed Nov 09, 2016 7:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Equilibrium Constant
Replies: 3
Views: 484

Re: Equilibrium Constant

Use concentrations, but make sure all are converted into concentrations.
by kara_kremer_2N
Tue Nov 01, 2016 7:42 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bond hybridization
Replies: 2
Views: 306

Re: Sigma and Pi bond hybridization

Yes. The s orbital cannot have pi bonds because there are only two sub-orbitals. The p orbital can because after two of the sub-orbitals bond, there are four available to make up to two pi bonds
by kara_kremer_2N
Wed Oct 26, 2016 10:31 pm
Forum: Lewis Structures
Topic: 3.103
Replies: 1
Views: 229

Re: 3.103

A proton is identical to H+, or a Hydrogen atom without an electron. In the molecule above, the H+ will be attracted to the slightly negative Oxygen. When drawing Lewis structures, H+ is a good representation of a proton and is commonly interchangeable.
by kara_kremer_2N
Tue Oct 18, 2016 3:39 pm
Forum: Lewis Structures
Topic: Charges When Drawing Lewis Structure [ENDORSED]
Replies: 2
Views: 386

Re: Charges When Drawing Lewis Structure [ENDORSED]

As Lavelle was saying, you use the octet rules as guideline for transferring electrons. Likewise, you can use the same guideline to know the charges of the elements when doing Lewis structures. For example, Oxygen likes gain two electrons to make an octet, so the ion will generally have a charge of ...
by kara_kremer_2N
Thu Oct 13, 2016 3:43 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical equations too slow... any advice? [ENDORSED]
Replies: 18
Views: 1534

Re: Balancing Chemical equations too slow... any advice? [ENDORSED]

Also, balance Oxygen last if it is present. It tends to be a little more difficult so balancing it last saves some time.
by kara_kremer_2N
Wed Oct 05, 2016 9:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post Module Question #8/9 [ENDORSED]
Replies: 3
Views: 519

Re: Post Module Question #8/9 [ENDORSED]

Try using the equation KE=1/2 mv^2

You should get the kinetic energy for one hydrogen atom. From there you can use dimensional analysis to calculate the kinetic energy per mole of electrons/hydrogen atoms.
by kara_kremer_2N
Thu Sep 29, 2016 2:50 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.11 Different Series
Replies: 3
Views: 481

1.11 Different Series

Question 1.11 states, "In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series, Lyman series, Paschen series), as shown in Figs. 1.10 and 2.1. What is common to the lines within a series that makes groupie them tog...

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