Search found 21 matches
- Sat Mar 17, 2018 8:15 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible vs Irreversible
- Replies: 1
- Views: 357
Reversible vs Irreversible
Can someone explain why w=-PdeltaV is irreversible, whereas w=-nRTln(V1/V2) is reversible?
- Sat Dec 09, 2017 9:34 pm
- Forum: Ideal Gases
- Topic: Kc and shifting of reaction
- Replies: 3
- Views: 773
Kc and shifting of reaction
When given Kc how do you determine which way the reaction would shift based on this value?
- Sat Dec 09, 2017 9:27 pm
- Forum: Naming
- Topic: Iron v ferrate in coordination compound naming
- Replies: 8
- Views: 5321
Re: Iron v ferrate in coordination compound naming
When the coordination compound has a negative charge we would usually add the suffix -ate to the Lewis Acid, but for iron we would change it to ferrate instead.
- Sat Dec 09, 2017 9:21 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming of coordination compounds
- Replies: 1
- Views: 344
Naming of coordination compounds
When do we have to put "ion" at the end of the name of the coordination compound?
- Sat Dec 09, 2017 9:17 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Dentates
- Replies: 1
- Views: 330
Re: Dentates
Usually when looking for dentates you want to find how many N with a lone pairs and O- there are. Each of those would provide an extra binding sites therefore giving you dentates.
- Sat Dec 09, 2017 9:14 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Lewis Structures and Formal Charge
- Replies: 7
- Views: 1421
Re: Lewis Structures and Formal Charge
It would be best to calculate the formal charge just to check if your structure is stable. The lower the total formal charge of your compound the more stable it would be, so you would want to find the structure with a formal charge of 0.
- Sat Dec 09, 2017 9:09 pm
- Forum: Lewis Structures
- Topic: resonance and delocalization
- Replies: 2
- Views: 458
Re: resonance and delocalization
Yes, since delocalized pi-bonds mean that pi-bonds are able to move around, so resonance would mean pi-bonds would be delocalized.
- Sat Dec 09, 2017 8:56 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 4
- Views: 773
Re: Bond Order
What's the difference between bond from the central atom and to the central atom? Can you clarify a bit more?
- Sat Dec 09, 2017 8:48 pm
- Forum: Hybridization
- Topic: sp3 hybridization
- Replies: 6
- Views: 1168
Re: sp3 hybridization
Lone pairs count as a region of electron density, so for the case of a seesaw structure there would be 5 region of electron density due to the 2 lone pairs and the 3 other bonds. Radicals would also count as a region of electron density!
- Sat Dec 09, 2017 8:45 pm
- Forum: Hybridization
- Topic: Do pi bonds only form with double/triple bonds?
- Replies: 5
- Views: 732
Re: Do pi bonds only form with double/triple bonds?
Yes, pi-bonds are bonds created by the overlapping of the p-orbitals.
- Sat Dec 09, 2017 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shaped and Trigonal Pyramidal
- Replies: 6
- Views: 841
Re: T-shaped and Trigonal Pyramidal
T-shape has 2 lone e- pairs and around the central plane where as trigonal pyramidal has 1 lone e- pair on the top or bottom of the central atom.
- Sat Dec 09, 2017 8:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Pi bond
- Replies: 3
- Views: 576
Re: Pi bond
Generally, the pi-bonds are delocalized if there is resonance since the pi-bond can be moved around without affecting the structure.
- Sat Dec 09, 2017 8:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 5
- Views: 660
Re: Lone pairs
A lone pair will most likely contribute to a dipole moment as long as there isn't another lone pair to "cancel it out" symmetrically.
- Sat Dec 09, 2017 8:27 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong acids and base vs weak acids and base
- Replies: 1
- Views: 331
Strong acids and base vs weak acids and base
How would you know if the reaction is for a strong acid/base or weak acid/base?
- Sat Dec 09, 2017 8:09 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: X in ICE table
- Replies: 3
- Views: 3618
X in ICE table
How do we determine if we need to add or subtract x from the reactant?
- Sat Dec 09, 2017 7:58 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Relationship between pka, ka, and acidity strength
- Replies: 5
- Views: 11750
Re: Relationship between pka, ka, and acidity strength
pKw = -log Kw = -log(1.0*10^-14)=14.00 at 25C
- Sat Dec 09, 2017 7:54 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Seesaw
- Replies: 2
- Views: 522
Re: Seesaw
The conjugate seesaw effect comes about because
- stronger acids produce weaker conjugate bases (less likely to accept protons and re-form the acid),
- stronger bases produce weaker conjugate acids (less likely to release protons and re-form the base).
- stronger acids produce weaker conjugate bases (less likely to accept protons and re-form the acid),
- stronger bases produce weaker conjugate acids (less likely to release protons and re-form the base).
- Sat Dec 09, 2017 7:49 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Question 12.45
- Replies: 3
- Views: 702
Question 12.45
Arrange the following bases in order of increasing strength on the basis of the pKa values of their conjugate acids, which are given in parentheses: (a) ammonia (9.26); (b) methylamine (10.56); (c) ethylamine (10.81); (d) aniline (4.63). After changing the pKa to pKb, how do we determine the strengt...
- Sat Dec 09, 2017 7:38 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Polydentates Ligands
- Replies: 2
- Views: 532
Polydentates Ligands
What does it mean to be polydentate and how do I determine the number of dentates are there in the compound?
- Sun Oct 15, 2017 11:04 pm
- Forum: Properties of Light
- Topic: Speed of Light Constant
- Replies: 18
- Views: 1777
Re: Speed of Light Constant
Any would be fine since they are relatively close enough, but I usually would use 3.00x10^8 m/s.
- Sun Oct 15, 2017 11:00 pm
- Forum: Properties of Light
- Topic: Chapter 1: Question 1.9 [ENDORSED]
- Replies: 7
- Views: 1671
Chapter 1: Question 1.9 [ENDORSED]
A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. Complete the following table and match each ...