Search found 22 matches
- Sun Mar 12, 2017 4:28 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Preference in numbering
- Replies: 10
- Views: 5036
Re: Preference in numbering
Also, when naming cycloalkanes, the where the numbering on the double bond have to begin? The numbering has to encompass the both ends of the double bond next to each other right?
- Sun Mar 12, 2017 4:27 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Preference in numbering
- Replies: 10
- Views: 5036
Re: Preference in numbering
When looking at numbering, we try to prioritize lowest numbers over priority of substituents right?
For example, if we had the substituents of a methyl and propyl group on an alkane, and the starting with the methyl would get the lowest numbering, we would start with methyl right?
For example, if we had the substituents of a methyl and propyl group on an alkane, and the starting with the methyl would get the lowest numbering, we would start with methyl right?
- Fri Mar 03, 2017 9:36 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst
- Replies: 16
- Views: 2297
Re: Catalyst
So catalysts can be included in the rate law, but what about intermediates?
- Tue Feb 21, 2017 11:08 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-Equilibrium Method for Reaction Mechanisms
- Replies: 3
- Views: 669
- Tue Feb 21, 2017 11:08 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-Equilibrium Method for Reaction Mechanisms
- Replies: 3
- Views: 669
- Tue Feb 14, 2017 11:02 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Winter 2015 Midterm Question 2 and 3 D
- Replies: 5
- Views: 1010
Re: Winter 2015 Midterm Question 2 and 3 D
for every question with bond enthalpies vs enthalpies of formation, will the question specify what they want?
- Sat Feb 04, 2017 5:45 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Chapter 8 Number 77
- Replies: 2
- Views: 499
Re: Chapter 8 Number 77
So basically any structure with resonance, has less enthalpy.
- Thu Feb 02, 2017 4:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 24682
Re: Quiz 1 Preparation Answers
When delta H is positive and delta S is negative, there is no way for there to be spontaneity at any temperature. This is is because entropy of the system is decreasing, and the enthalpy of heat is increasing. naturally, this would never occur in the real world. If it was vice versa, a positive Delt...
- Thu Jan 26, 2017 9:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Units of Reaction Enthalpies
- Replies: 11
- Views: 2053
Re: Units of Reaction Enthalpies
So basically to summarize:
q is generally in kJ
Delta H usually in kJ
Standard enthalpy of formation is only kJ/mol
q is generally in kJ
Delta H usually in kJ
Standard enthalpy of formation is only kJ/mol
- Thu Jan 19, 2017 1:32 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.13 & Heat Absorption
- Replies: 2
- Views: 509
Re: HW 8.13 & Heat Absorption
if the system is losing heat, then the internal energy of the system decreases because q is negative. Vice versa, if the system absorbs or gains heat.
- Sun Jan 15, 2017 10:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Units of Reaction Enthalpies
- Replies: 11
- Views: 2053
Re: Units of Reaction Enthalpies
The units used are dependent on the situation. Typically, it is given in kj/mol unless otherwise stated.
- Wed Nov 30, 2016 6:14 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: What is MO theory for? [ENDORSED]
- Replies: 20
- Views: 8818
Re: What is MO theory for? [ENDORSED]
When we are determining whether to use the z>8 or z<8 diagram for a molecule, which atom do we look at? Like for example for, NO, do we look at the z for nitrogen or oxygen ?
- Wed Nov 30, 2016 6:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2764478
Re: Post All Chemistry Jokes Here
How do you feel after that O chem exam?
I'm DIEN!
I'm DIEN!
- Wed Nov 30, 2016 6:09 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Oxoacids
- Replies: 2
- Views: 627
Re: Oxoacids
What are the strongest vs weakest oxyacids?
- Tue Nov 29, 2016 4:53 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Identifying a strong acid
- Replies: 6
- Views: 2228
Re: Identifying a strong acid
How can we immediately recognize if its a strong acid or weak acid, without memorizing them?
- Mon Nov 28, 2016 10:08 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Henderson Hasselbalch Equation [ENDORSED]
- Replies: 4
- Views: 1234
Re: Henderson Hasselbalch Equation [ENDORSED]
Why can you not perform a titration on a weak acid and weak base? Why does one or the other have to be strong?
- Thu Nov 17, 2016 9:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Difference between Pressure and compression/expansion?
- Replies: 5
- Views: 4764
Re: Difference between Pressure and compression/expansion?
How does expansion/compression affect which way the equilibrium shifts? like what is the relationship
- Sat Nov 12, 2016 5:57 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: What is a Ligand?
- Replies: 3
- Views: 1437
Re: What is a Ligand?
Can ligands be single atoms or do they have to be molecules? also, what are commonly used ligands?
- Sat Nov 05, 2016 6:10 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: What is MO theory for? [ENDORSED]
- Replies: 20
- Views: 8818
Re: What is MO theory for? [ENDORSED]
How do we find bond order from a molecular orbital diagram?
- Fri Oct 28, 2016 9:51 pm
- Forum: Sigma & Pi Bonds
- Topic: Quiz 2 Preparation [ENDORSED]
- Replies: 8
- Views: 3630
Re: Quiz 2 Preparation [ENDORSED]
For every metal that can have multiple valence electrons, will we be given the number of valence electron it has? for example alminium (III) oxide, will we get the III?
- Tue Oct 18, 2016 9:59 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity [ENDORSED]
- Replies: 3
- Views: 945
Re: Electron Affinity [ENDORSED]
you can also think of electron affinity as an atom's tendency or natural ability for wanting electrons. An atom with a stronger electron affinity is one that would be more likely to take an electron to complete a sub shell.
- Fri Sep 30, 2016 8:52 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect
- Replies: 2
- Views: 521
Re: Photoelectric effect
It is based on the equation , E(photon) = threshold energy + E(excess). If energy required to remove the electron is equal to the energy of the photon, then you will not have any excess kinetic energy.