## Search found 21 matches

Sat Mar 17, 2018 8:15 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 1
Views: 239

### 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: 495

### 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: 2161

### 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: 231

### 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: 201

### 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: 868

### 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: 277

### 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: 528

### 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: 547

### 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: 451

### 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: 475

### 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: 320

### 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: 406

### 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: 195

### 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: 1756

### 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: 7273

### 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: 332

### 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).
Sat Dec 09, 2017 7:49 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Question 12.45
Replies: 3
Views: 456

### 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: 373

### 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: 1030

### 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: 3
Views: 564

### 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 ...