Search found 21 matches

by Sophia Xu 3F
Mon Feb 29, 2016 8:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2016
Replies: 48
Views: 19201

Re: Quiz 3 Winter 2016

when we are asked to "draw the structure" of some molecule, are we drawing the line structure or a structure that shows the atoms?
by Sophia Xu 3F
Sat Feb 27, 2016 5:57 pm
Forum: *Aldehydes
Topic: functional groups as substituents in naming?
Replies: 2
Views: 883

Re: functional groups as substituents in naming?

and do we just neglect the 1 in PROPANE because ALDEHYDE group has to be at the end of the chain?
by Sophia Xu 3F
Sat Feb 27, 2016 5:55 pm
Forum: *Aldehydes
Topic: functional groups as substituents in naming?
Replies: 2
Views: 883

functional groups as substituents in naming?

When we are doing naming for functional groups, do we treat the functional groups as substituents? like in the course reader, PROP-AN-AL C3H6 is just propanal, not 1-propanal because we neglect the 1 like we do in substituent namings? for the molecule right below it, which has a KEYTONE attached to ...
by Sophia Xu 3F
Sat Feb 27, 2016 5:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2016
Replies: 48
Views: 19201

Re: Quiz 3 Winter 2016

Does the quiz cover functional group material?
by Sophia Xu 3F
Mon Feb 15, 2016 4:42 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Intermediate
Replies: 1
Views: 337

Intermediate

So is an intermediate has to be gone by the end of the reaction steps? Aka intermediate will never be part of the products?
by Sophia Xu 3F
Thu Feb 11, 2016 6:18 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Determining Entropy
Replies: 5
Views: 3518

Re: Determining Entropy

More complicated molecules tend to have more entropy
by Sophia Xu 3F
Sun Feb 07, 2016 3:55 pm
Forum: Balancing Redox Reactions
Topic: Clarification on Oxidizing and Reduction Agents
Replies: 2
Views: 336

Re: Clarification on Oxidizing and Reduction Agents

Yes, if it's undergoing oxidation, it's the reducing agent, and vice versa.
by Sophia Xu 3F
Mon Jan 25, 2016 10:30 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: P is the inverse of V?
Replies: 1
Views: 362

P is the inverse of V?

For the equation that change in S= nRln(V1/V2), why can we just replace V with P for the equation? Aka what does "P is the inverse of V" exactly mean?
Thanks!
by Sophia Xu 3F
Sun Jan 24, 2016 4:35 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns
Replies: 4
Views: 783

Re: Steam Burns

when steam hits your hand, the gas is going through a phase change from gas to water (on your hand). This phase change releases energy.
but when the boiling water hits your hand, there's no phase change.
thus steam burn is much worse than water burn.
hope that helps!
by Sophia Xu 3F
Sun Jan 17, 2016 5:22 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns vs. Water Burns
Replies: 6
Views: 3246

Re: Steam Burns vs. Water Burns

think of it this way:
when steam hits your hand, the gas is going through a phase change from gas to water (on your hand). This phase change releases energy.
but when the boiling water hits your hand, there's no phase change.
thus steam burn is much worse than water burn.
hope that helps!
by Sophia Xu 3F
Sun Jan 10, 2016 3:39 pm
Forum: Phase Changes & Related Calculations
Topic: Exothermic vs. Endothermic
Replies: 8
Views: 2217

Re: Exothermic vs. Endothermic

I don't know if this would be helpful:
Exo is to release heat, the object cools down bc the heat is released;
Endo is to absorb heat, the object heats up bc heat is getting into the object.
by Sophia Xu 3F
Sat Dec 05, 2015 8:09 pm
Forum: Naming
Topic: K3[CoF6]
Replies: 1
Views: 3331

K3[CoF6]

Its name is written as "potassium hexafluorocobaltate(III)", my question is why is the cobalt here has the "ate"?
Is it because the complex here is an anion?
by Sophia Xu 3F
Sun Nov 29, 2015 7:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increasing/Decreasing Pressure
Replies: 2
Views: 568

Re: Increasing/Decreasing Pressure

The side which has more moles of gas will shift to the side with fewer moles
by Sophia Xu 3F
Fri Nov 20, 2015 4:35 pm
Forum: Naming
Topic: Quiz 3 Prep: #2
Replies: 2
Views: 436

Re: Quiz 3 Prep: #2

Charge is outside the bracket
by Sophia Xu 3F
Mon Nov 09, 2015 7:03 pm
Forum: Naming
Topic: Naming order
Replies: 3
Views: 571

Naming order

For example, for [Co(NH3)4(NO2)Cl]Cl, it says the name for it is tetra-ammine-chloro-nitro-cobalt(III)-chloride.
My question is why is chloro before nitro in the name? Or does it matter at all? The order of chloro and nitro regarding to their positions in the formula?
Thanks!
by Sophia Xu 3F
Mon Nov 02, 2015 4:31 pm
Forum: Hybridization
Topic: How to Determine Electron Density
Replies: 4
Views: 1807

Re: How to Determine Electron Density

The number of bonds an atom has to form with other atoms + region of unpaired electrons.
Hope that helps!
by Sophia Xu 3F
Mon Nov 02, 2015 4:29 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO theory, how do we know Z?
Replies: 2
Views: 410

Re: MO theory, how do we know Z?

Z is the nuclear charge of an atom. So O is Z=8.
Hope that helps!
by Sophia Xu 3F
Sat Oct 31, 2015 9:18 pm
Forum: Hybridization
Topic: Sigma and Pi bond question
Replies: 1
Views: 339

Re: Sigma and Pi bond question

Hi,
The sigma bond should be Csp2-Csp2, not Csp3-Csp3. Each 3 has 3 regions of e- density so there are 3 hybrid orbitals for each C. They also each has an unhybridized p orbital that forms a pi bond with each other.
Hope this helps!
by Sophia Xu 3F
Sun Oct 25, 2015 12:28 pm
Forum: Ionic & Covalent Bonds
Topic: ground state electron configurations
Replies: 3
Views: 1691

Re: ground state electron configurations

Hi,
When u take off electrons, go in the order of np, ns, (n-1)d. Hope this helps!
by Sophia Xu 3F
Sun Oct 18, 2015 7:16 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 3
Views: 528

Re: Valence Electrons

Valence electrons are the electrons in the outest shell.
by Sophia Xu 3F
Sun Oct 04, 2015 2:23 pm
Forum: Properties of Light
Topic: Absorption Line Homework 1.11
Replies: 3
Views: 532

Re: Absorption Line Homework 1.11

Hi!
When light passes through some absorbing material like vapor to the spectrum, the radiation absorbed by certain frequencies will be shown on the spectrum as the absorption lines.
And yes the lines are those paired with wavelengths on the spectrum.

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