Search found 23 matches
- Thu Mar 10, 2016 12:25 am
- Forum: *Alcohols
- Topic: Priorities after functional group
- Replies: 1
- Views: 603
Priorities after functional group
I know that functional groups get priority with numbering. However, let's say after you number the carbons of a cycloalkene and the functional group is at carbon 1, there's a double bond two carbons to the right and a substituent one carbon to the left. Which way would be the correct way to number t...
amyl
Is pentyl always exchanged with amyl when naming an organic molecule? Are they interchangeable?
- Sun Mar 06, 2016 8:57 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv vs Cp
- Replies: 3
- Views: 1032
Cv vs Cp
When something has a constant volume and constant pressure, do you use Cv or Cp in calculations?
- Mon Feb 29, 2016 5:45 pm
- Forum: *Electrophilic Addition
- Topic: Two step electrophilic addition reaction
- Replies: 3
- Views: 806
Two step electrophilic addition reaction
(an example is on the bottom of page 87)
When an electrophilic addition reaction is two steps with the positively charged atom binding first and the negatively one binding second, how do we know where the two different atoms bind (on which side of the double bond)? Does it matter?
When an electrophilic addition reaction is two steps with the positively charged atom binding first and the negatively one binding second, how do we know where the two different atoms bind (on which side of the double bond)? Does it matter?
- Thu Feb 25, 2016 12:32 am
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Z and E when naming alkenes
- Replies: 2
- Views: 719
Z and E when naming alkenes
Do we always use Z or E when naming a compound with a double bond? I can't seem to figure out when exactly we use Z and E in naming. Also, on 1.26 in the organic chem book homework problem, I don't understand why it is E and not Z.
- Wed Feb 17, 2016 5:36 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: K = Kf/Kr
- Replies: 1
- Views: 90823
K = Kf/Kr
I'm confused on why K=kforward/kreverse. If the reaction is A -> B+C , isn't K=[B][C]/[A]? and kforward would equal [A] and kreverse would equal [B][C]. So wouldn't K=kreverse/kforward?
- Tue Feb 09, 2016 12:04 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Ka
- Replies: 1
- Views: 552
Ka
When a question asks to find Ka, does it imply that H+ is being formed in the reaction? (I am referring specifically to question 8 on the 2014 Winter Midterm)
- Tue Feb 09, 2016 12:01 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 14.119
- Replies: 1
- Views: 553
14.119
In the first stage of the reaction, why is H20+O2 reduced when it is not even in the problem? I thought the oxidation/reduction of water was only considered in electrolysis.
- Mon Feb 08, 2016 8:58 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: H kJ/mol or just kJ
- Replies: 1
- Views: 2701
H kJ/mol or just kJ
When finding delta H, how do we know whether to put the units as kJ or kJ/mol. Also, when dividing by the amount of moles, how do we know how much do divide by?
- Mon Feb 01, 2016 3:16 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: K>1 vs K<1
- Replies: 1
- Views: 4164
K>1 vs K<1
How come when K>1 (there is a higher concentration of products than reactants), the reaction favors the products? I would have thought that because there are more products, the reverse reaction would be favored in order to balance the products and reactants.
- Mon Jan 25, 2016 10:23 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Comparing Entropies
- Replies: 1
- Views: 411
Comparing Entropies
When comparing entropies of elements, which factors should be looked at first? Complexity, state, or amount of the molecule?
For example, would a 1 mol of a more complex gas have more or less entropy than 2 mol of a less complex gas?
For example, would a 1 mol of a more complex gas have more or less entropy than 2 mol of a less complex gas?
- Mon Jan 18, 2016 9:24 pm
- Forum: Calculating Work of Expansion
- Topic: Internal energy and work
- Replies: 2
- Views: 644
Internal energy and work
In equations where we calculate the internal energy, how do we know if there is work done? Can we tell just by looking at the chemical reaction?
- Fri Jan 15, 2016 2:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3665697
Re: Chemistry Jokes
"I'd make a chemistry joke but all the good ones Argon"
- Sun Jan 10, 2016 12:32 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity Units
- Replies: 2
- Views: 639
Heat Capacity Units
Are the standard units of heat and the specific heat capacity measured in Joules or kilojoules?
- Wed Dec 02, 2015 11:02 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: When to use Henderson Hasselbalch
- Replies: 2
- Views: 700
Re: When to use Henderson Hasselbalch
Does it make a difference whether we use Henderson Hasselbalch or an ICE box?
- Sun Nov 22, 2015 5:53 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: ICE table when calculating for pH
- Replies: 3
- Views: 1206
Re: ICE table when calculating for pH
pH + pOH =14. If you are given the pOH, you calculate the pH with the equation: pH = 14 - pOH
- Thu Nov 12, 2015 11:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solids
- Replies: 1
- Views: 281
Solids
Are solids never included when calculating equilibrium constants?
- Sun Nov 08, 2015 11:23 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3665697
Re: Chemistry Jokes
"Are you Na?
Because you're so-dium fine doe!!"
- Jewel Saad
Because you're so-dium fine doe!!"
- Jewel Saad
- Thu Oct 29, 2015 11:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electron distortions
- Replies: 2
- Views: 670
Electron distortions
What exactly are electron distortions? I know that electron distortions increase with the size of an atom but I am confused what exactly they are.
- Sat Oct 24, 2015 10:21 pm
- Forum: Hybridization
- Topic: Hybridization vs. Hybrid Orbitals
- Replies: 1
- Views: 572
Hybridization vs. Hybrid Orbitals
In a question, is asking for the hybridization of a molecule and asking for the hybrid orbitals of a molecule the same thing?
- Thu Oct 15, 2015 11:45 pm
- Forum: Lewis Structures
- Topic: Lewis Structure Stability
- Replies: 3
- Views: 1192
Re: Lewis Structure Stability
Does the order in which the elements are listed in the molecule name give any clue as to how the Lewis structure should be drawn? For example, in an element such as CH2COCH3-, can we gain a general idea of how the structure should look solely based on the order of the elements given?
- Fri Oct 09, 2015 10:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy Levels of d and s
- Replies: 3
- Views: 845
Re: Energy Levels of d and s
If the 3d subshell would fill up after the 4s subshell, if an electron was removed from an atom, would it be removed from the 4s subshell (which is on the outermost shell) or the 3d subshell (which has the higher l value)?
- Wed Sep 30, 2015 5:08 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 35349
Re: All students read this sig fig post [ENDORSED]
Can we just round off to the smallest amount of sig figs in the given numbers in the problem? Generally that's what I do (it's normally 3-4 sig figs), but I'm not sure if that's what he wants.