Search found 21 matches

by Leslie Romo 1C
Sun Mar 06, 2016 11:22 pm
Forum: *Cycloalkanes
Topic: Carbocycles
Replies: 1
Views: 287

Carbocycles

Hi guys, are the carbocycles ( chair and boat) named just like the regular cyclo's? Or do they have a special rule? I'm a little confused. Thank you!
by Leslie Romo 1C
Sun Feb 28, 2016 4:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119232

Re: Chemistry Jokes

hehehe
by Leslie Romo 1C
Sun Feb 21, 2016 11:48 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Endorgonic & exorgonic
Replies: 1
Views: 279

Endorgonic & exorgonic

Can anyone explain endergonic and exergonic reactions? Is it just the way the graphs are set up?
by Leslie Romo 1C
Sun Feb 14, 2016 9:31 pm
Forum: General Rate Laws
Topic: Ordered Reaction
Replies: 1
Views: 230

Re: Ordered Reaction

First order is the rate of consumption proportional to the first power of the concentration (has a slope of -k) Second order is the rate of proportional to the second power of the concentration.. ( has a slope of k) A zero-order is the rate independent of the concentration of the reactant ( has a sl...
by Leslie Romo 1C
Sun Feb 07, 2016 6:03 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cell
Replies: 1
Views: 195

Galvanic Cell

Hi.
I didn't go to lecture when Prof. Lavelle talked about the Galvanic Cell.
Could someone explain to me what the salt bridge is?? I understand what the galvanic cell is for but I'm confused as to why there is a salt bridge
by Leslie Romo 1C
Sun Jan 31, 2016 9:07 am
Forum: Balancing Redox Reactions
Topic: oxidized or reduced
Replies: 1
Views: 582

oxidized or reduced

This is probably a really simple question but I'm still confused and need some clarification... an electrode is oxidized and loses e- an cathode is reduced and gains e- is this correct???? Also in this equation...: how would you know what is being oxidized or reduced...? 2AS (s) +3 CL2(g) ---> 2ASCL3
by Leslie Romo 1C
Tue Jan 19, 2016 7:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119232

Re: Chemistry Jokes

=)
by Leslie Romo 1C
Sun Jan 17, 2016 8:13 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Heat capacity
Replies: 2
Views: 366

Re: Heat capacity

forgot to add:
NO2 is the answer b/c it has more molecular complexity. meaning it requires more heat to raise the temp of 1 mol of NO2 by 1 than the heat required to raise the temp of NO by 1 degree.
by Leslie Romo 1C
Sun Jan 17, 2016 8:04 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Heat capacity
Replies: 2
Views: 366

Re: Heat capacity

the def of molar heat capacity is the heat capacity divided by the amount (in moles) of the sample

it could also be defined as the heat required to raise the temperature of 1 mol of a substance by 1 degree Celsius
by Leslie Romo 1C
Sat Jan 09, 2016 9:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimetry Cup
Replies: 3
Views: 467

Re: Calorimetry Cup

I agree with the person above!


Calorimeters are usually used to measure changes that take place in solution. It needs to insulated because the calorimeter can keep in the heat of the liquid in for an accurate measurement of the change in temperature!
by Leslie Romo 1C
Tue Dec 01, 2015 9:20 pm
Forum: Identifying Acidic & Basic Salts
Topic: Salt acidic or basic?
Replies: 3
Views: 1634

Re: Salt acidic or basic?

salt consists of a cation and anion ionically bonded with each other.
If the cation forms a strong base and the anion a weak acid, then it's basic.
If the cation forms a weak base and the anion a strong acid, then it's acidic.
by Leslie Romo 1C
Thu Nov 26, 2015 5:09 pm
Forum: Lewis Acids & Bases
Topic: percentage ionization
Replies: 1
Views: 437

percentage ionization

In the problem "What is the PH and percentage ionization of acetic acid, in .10M CH3COOH(aq)? (Ka=1.8x10^-5 for acetic acid)"
How do you find the percentage ionization of the acetic acid??

I found the pH to be -log[1.3x10^-3]= 2.9
by Leslie Romo 1C
Sat Nov 21, 2015 11:26 pm
Forum: Lewis Acids & Bases
Topic: Conjugate base
Replies: 2
Views: 1108

Conjugate base

how do you know/calculate what conjugate base is the strongest?

ex: which of the following produces the strongest conjugate base???

HF(pKa=3.45)
CH3COOH(pKa=4.75)
HClO(pkA=7.53)
HIO(pKa=10.64)
HCOOH(pKa=3.75)
by Leslie Romo 1C
Sun Nov 15, 2015 12:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K Calculation Clarification
Replies: 1
Views: 246

K Calculation Clarification

If the formulas have liquids and solids, then you should ignore the liquids and solids and only include aqueous or gas in the K calculation? is this right?

does this mean that you would replace the liquids and solids with a 1 ?
by Leslie Romo 1C
Fri Nov 06, 2015 9:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX2E3
Replies: 2
Views: 414

Re: AX2E3

I agree ^
- The 3 three loan pairs "cancel" each other out in AX2E3 making it linear.
but in AX2E2 the loan pairs do not cancel each other out making the shape to bend
by Leslie Romo 1C
Fri Oct 30, 2015 10:43 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order and Bond Stability
Replies: 4
Views: 5360

Re: Bond Order and Bond Stability

A strong bond = higher bond order
Therefore, a high bond order is more stable
by Leslie Romo 1C
Sat Oct 24, 2015 12:28 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: #5 on the first quiz 2 preparation
Replies: 3
Views: 493

Re: #5 on the first quiz 2 preparation

The entire question is : Which of the following is the correct order of increasing stability? A) O 2 - > N 2 > N 2 + > C 2 B) N 2 + > N 2 > O 2 - >C 2 C) N 2 > N 2 + > C 2 > O 2 - D) N 2 > N 2 + > O 2 - > C 2 O 2 - : 13e- BO: 1.5 N 2 : 10 e- BO: 3 N 2 + : 9e- BO: 2.5 C 2 : 8e- BO: 2
by Leslie Romo 1C
Fri Oct 23, 2015 10:56 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: #5 on the first quiz 2 preparation
Replies: 3
Views: 493

#5 on the first quiz 2 preparation

The question is:
"Which of the following is the correct order of increasing stability?"


What does it mean by increasing stability and how do we find this???
by Leslie Romo 1C
Sat Oct 17, 2015 12:15 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau Princple
Replies: 2
Views: 368

Aufbau Princple

Hi
Can anyone explain the "exceptions" to the Aufbau Principle?
I know that Silver is one of them but I don't understand why
by Leslie Romo 1C
Fri Oct 09, 2015 8:54 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 1
Views: 369

Wavelength

The problem is "What is the wavelength of the radiation emitted when an electron transitions from n=4 to n=3." I am bit confused on how to set up the formula. Would this be the formula:
ΔE=-hR(1/n^2-1/n^2)

The first 'n' being n=4 and the second n=3?? how do we know which one is which?
by Leslie Romo 1C
Fri Oct 02, 2015 1:42 pm
Forum: SI Units, Unit Conversions
Topic: How do you go from meter to nanometer? [ENDORSED]
Replies: 7
Views: 1606

How do you go from meter to nanometer? [ENDORSED]

For a problem my answer was 3.4x10^-7m but in the solutions manual the answer turns out to be 340 nm. How do you go from 3.4x10^-7m to 340 nm?

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