Search found 21 matches

by Steven Chau 1B
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?
by Steven Chau 1B
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?
by Steven Chau 1B
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.
by Steven Chau 1B
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?
by Steven Chau 1B
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.
by Steven Chau 1B
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.
by Steven Chau 1B
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.
by Steven Chau 1B
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?
by Steven Chau 1B
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!
by Steven Chau 1B
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.
by Steven Chau 1B
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.
by Steven Chau 1B
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.
by Steven Chau 1B
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.
by Steven Chau 1B
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?
by Steven Chau 1B
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?
by Steven Chau 1B
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).
by Steven Chau 1B
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...
by Steven Chau 1B
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?
by Steven Chau 1B
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.
by Steven Chau 1B
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 ...

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