Search found 22 matches

by Drishti_Jain_1D
Sat Mar 18, 2017 8:44 pm
Forum: *Alcohols
Topic: OH Group Hydroxy vs. Alcohol
Replies: 1
Views: 689

OH Group Hydroxy vs. Alcohol

When is an OH group on an organic molecule named as a -hydroxy- and when is it named as an -ol?

A specific example of this can be seen on Winter 2015 Final Question 9B where in 1,3,4,5,6-pentahydroxy-2-hexanone hydroxy is also an -OH group.
by Drishti_Jain_1D
Sun Mar 12, 2017 6:39 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: The Rate Limiting Step
Replies: 1
Views: 279

The Rate Limiting Step

If the first step is the rate limiting step and it is a reaction that goes in the forward and reverse direction, why isn't the overall reaction rate the forward reaction rate over the reverse reaction rate in the rate limiting step?
by Drishti_Jain_1D
Sun Mar 05, 2017 1:01 pm
Forum: *Electrophiles
Topic: CH3Cl
Replies: 2
Views: 698

CH3Cl

Why is CH3Cl an electrophile if Cl is full of lone pairs?
Is it only the carbon region that is an electrophile?
Does that make CH3Cl both a nucleophile and an electrophile?

Thanks!
by Drishti_Jain_1D
Sun Feb 26, 2017 5:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018475

Re: Post All Chemistry Jokes Here

Q: What do you do with a sick chemist?



A: First you try to helium, then you try to curium, but if that fails, then you have to barium.
by Drishti_Jain_1D
Tue Feb 14, 2017 7:53 pm
Forum: Balancing Redox Reactions
Topic: HW 14.5
Replies: 2
Views: 323

HW 14.5

Can someone please explain why the half reaction for oxidation of the reaction in this problem is O3 --> O2 when both the oxidation charges of these molecules are 0? Doesn't oxidation need to have a loss of electrons from the reactant to product?
by Drishti_Jain_1D
Sun Feb 12, 2017 6:34 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in entropy when temperature changes
Replies: 1
Views: 191

Change in entropy when temperature changes

For some textbook problems, the change in entropy when temperature changes uses the equation S=nCln(T2/T1) and for some, the equation S=nRln(T2/T1) is used. How do you know which equation to use under certain conditions?
by Drishti_Jain_1D
Fri Feb 03, 2017 10:36 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 2
Views: 353

Entropy

Is there anyway to obtain the change in entropy when only change in enthalpy is known? Is there a derivation in which this would be possible, or do you just assume change in enthalpy acts like a heat (q)?
by Drishti_Jain_1D
Mon Jan 30, 2017 12:20 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework 8.41
Replies: 1
Views: 268

Homework 8.41

Homework Question 8.41 asks for a the final temperature when an ice cube has been placed in water at a certain temperature. Using the correct equations for heat and enthalpy, I am continuously getting the same answer for the final temperature: 33 degrees Celsius. However, the solutions manual says t...
by Drishti_Jain_1D
Sun Jan 22, 2017 9:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018475

Re: Post All Chemistry Jokes Here

What did the policeman say to the atom?

I've got my ion you!
by Drishti_Jain_1D
Sun Jan 15, 2017 5:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bruincast
Replies: 1
Views: 267

Bruincast

Hi,

I wanted to review Lecture 3 on bruincast. I was able to do it on my computer, but I was wondering if the iphone version wasn't working for anyone else, or if it'll be working anytime soon?

Thank you.
by Drishti_Jain_1D
Thu Dec 01, 2016 3:17 pm
Forum: *Titrations & Titration Calculations
Topic: Homework 13.23
Replies: 1
Views: 276

Homework 13.23

For question 13.23, how do you know that you're only supposed to add 30 mL of HCl to calculate final pH since there was no indication of when to stop the titration in the problem?
by Drishti_Jain_1D
Mon Nov 28, 2016 6:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: HW 11.67 Reasoning
Replies: 2
Views: 415

HW 11.67 Reasoning

2HCl --> H2 + Cl2
Pressures in order of HCl, H2, and Cl2 are 2.0, 1.0, 3.0. Why do you have to push the reaction as far to the left as possible? And how do you do this? Why can't you first find Q and use that to determine which eay the reaction moves when using ICE?
by Drishti_Jain_1D
Wed Nov 23, 2016 9:24 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids and strength
Replies: 2
Views: 603

Polyprotic Acids and strength

Are polyprotic acids always weak acids, or are there any examples of strong polyprotic acids?
by Drishti_Jain_1D
Sun Nov 20, 2016 2:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook 11.7 (a)
Replies: 1
Views: 221

Textbook 11.7 (a)

For problem 11.3 in the textbook, how can you determine that it is Flask 3 that is at equilibrium without any value of K?
by Drishti_Jain_1D
Wed Nov 09, 2016 6:10 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Diagram for HF [ENDORSED]
Replies: 1
Views: 407

Molecular Orbital Diagram for HF [ENDORSED]

How do you draw the molecular orbital diagram for HF? I tried looking up the answer but was confused by the energy states for H.
by Drishti_Jain_1D
Fri Nov 04, 2016 2:23 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order Conceptual Question
Replies: 1
Views: 224

Bond Order Conceptual Question

What is the significance of finding bond order when you have already drawn a Lewis Structure? In other words, what can bond order tell you about the strength of a bond that the Lewis structure can't show you?
by Drishti_Jain_1D
Sun Oct 30, 2016 10:03 pm
Forum: Hybridization
Topic: Conceptual question
Replies: 1
Views: 203

Conceptual question

When do we know if an electron will be promoted or not? And also, how do you know when promotion will lead to a lower energy state for the atom or not?
by Drishti_Jain_1D
Mon Oct 17, 2016 10:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter 2 Homework #15
Replies: 1
Views: 361

Chapter 2 Homework #15

How many (a) nodal planes, (b) radial nodes are there in a 3p-orbital? Focusing on part b, in the textbook, number of radial nodes = n - l -1. For this problem, using the 3p orbital, I concluded that n = 3, due to the shell of the electron and l =1, due to the fact that this is the p orbital. These ...
by Drishti_Jain_1D
Sun Oct 16, 2016 3:06 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Energy in the Atomic Spectroscopy
Replies: 2
Views: 375

Energy in the Atomic Spectroscopy

In the equation En= -hR/n^2, does En represent the potential energy of the photon? If not, what type of energy is this equation alone solving for?
by Drishti_Jain_1D
Sun Oct 09, 2016 3:16 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Chapter 1, Problem #15
Replies: 1
Views: 243

Chapter 1, Problem #15

I understand that #15 in the textbook is supposed to be solved using Rydberg's Equation; however, is it possible to use the equation we covered in class for an H-atom (En = -hR/n^2) in order to solve it? And if not, is Rydberg's Equation given to us on quizzes or tests?
by Drishti_Jain_1D
Fri Sep 30, 2016 3:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: The Atomic Spectroscopy Experiment
Replies: 1
Views: 224

The Atomic Spectroscopy Experiment

In the setup of an Atomic Spectroscopy experiment, does the detector read the wavelengths of light absorbed and emitted or the frequencies of light absorbed and emitted? Also, why does it matter which one is detected if you can use the equation c= frequency x wavelength in order to solve for the mis...

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