Search found 21 matches

by Lubna_Abdulmajeed_2A
Mon Mar 20, 2017 1:13 am
Forum: Resonance in Organic Compounds
Topic: writing reaction rate laws [ENDORSED]
Replies: 4
Views: 2287

Re: writing reaction rate laws [ENDORSED]

Yeah, we include catalysts but not intermediates.
by Lubna_Abdulmajeed_2A
Mon Mar 20, 2017 1:12 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate limiting step
Replies: 4
Views: 663

Re: Rate limiting step

^only if the rate itself is given. Otherwise, i dont think we need to calculate it.
by Lubna_Abdulmajeed_2A
Mon Mar 06, 2017 8:43 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Gibbs Free Energy and Temperature
Replies: 1
Views: 378

Gibbs Free Energy and Temperature

In the Introduction to Organic Chemistry book on page 164, there is a discussion of whether of not a reaction will occur at room temperature based on the values of the gibbs free energy of the reaction. I was wondering how we can tell whether or not a reaction will take place in room temp. based on ...
by Lubna_Abdulmajeed_2A
Mon Mar 06, 2017 8:19 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Profiles Gibbs Free Energy of Activation
Replies: 1
Views: 392

Re: Organic Reaction Profiles Gibbs Free Energy of Activation

I believe we draw it with respect to reactants, since there is a statement on page 157 that says "organic chemists usually discuss reaction profiles with respect to the standard Gibbs free energy of the reactants..."
by Lubna_Abdulmajeed_2A
Mon Mar 06, 2017 8:17 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Mechanisms
Replies: 1
Views: 392

Organic Reaction Mechanisms

In the introduction to Organic Chemistry book, on page 161, there is an equation that states the following: G*=H*-TS* (standard gibbs free energy of activation = standard enthalpy of activation - temperature*standard entropy of activation) and below it, there is a statement that says in this case de...
by Lubna_Abdulmajeed_2A
Mon Feb 13, 2017 2:00 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: book question 9.13
Replies: 1
Views: 338

book question 9.13

Question 9.13 in the textbook asks the following: "During the test of an internal combustion engine, 3.00L of nitrogen gas at 18.5 degrees C was compressed suddenly (and irreversibly) to 0.500L by driving in a piston. In the process, the temperature of the gas increased to 28.1 degrees C. Assum...
by Lubna_Abdulmajeed_2A
Sun Feb 12, 2017 4:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Formulas
Replies: 1
Views: 389

Formulas

Will the midterm include questions about the derivations of formulas?

Thank you.
by Lubna_Abdulmajeed_2A
Mon Jan 30, 2017 9:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.65
Replies: 1
Views: 315

8.65

Can someone please clarify why we subtract the answer by twice the enthalpy formation of NO? Why was NO involved in the calculation at all? Why couldnt we just use the two equations given?

thanks!
by Lubna_Abdulmajeed_2A
Sun Jan 22, 2017 11:38 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Adiabatic, Diathermic Walls and Insulation.
Replies: 1
Views: 582

Re: Adiabatic, Diathermic Walls and Insulation.

So internal energy of a system can change because of energy being transferred either as heat or as work. (u=q+w) If the system does work on the surroundings, then the internal energy decreases, if work is being done on the system, then the internal energy increases. Similarly, if energy as heat is t...
by Lubna_Abdulmajeed_2A
Sun Jan 15, 2017 6:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Clarification on Heat Capacities
Replies: 2
Views: 375

Re: Clarification on Heat Capacities

I believe it just depends on what is given in the question. Specific heat capacity is the amount of heat required to change the temperature of one gram of a substance by 1 degree celsius or kelvin; molar heat capacity is the amount of heat required to change the temperature of one MOLE of a substanc...
by Lubna_Abdulmajeed_2A
Fri Dec 02, 2016 3:58 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Note on page 156 [ENDORSED]
Replies: 1
Views: 462

Note on page 156 [ENDORSED]

On page 156 in the course reader, there is a note that says:
"if the concentration of H3O+ < 10^-7, the solution is considered neutral..."
if the conc. is less than 10^7, shouldn't it be basic?
by Lubna_Abdulmajeed_2A
Fri Dec 02, 2016 3:52 am
Forum: Identifying Acidic & Basic Salts
Topic: Stronger Acid [ENDORSED]
Replies: 2
Views: 571

Re: Stronger Acid [ENDORSED]

The more oxygens there are, the stronger the acid.
by Lubna_Abdulmajeed_2A
Fri Dec 02, 2016 3:49 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of Acids
Replies: 1
Views: 392

Re: Strength of Acids

So my understanding of this is as follows: when we have an oxoacids, in order to determine its strength we look at two factors: the electronegativity of the central atom, and the number of oxygens surrounding it. The more oxygen atoms, the stronger the acid. As far as electronegativity goes which is...
by Lubna_Abdulmajeed_2A
Wed Nov 16, 2016 12:32 am
Forum: Naming
Topic: Quiz 3 preparation - Fall 2015
Replies: 2
Views: 412

Quiz 3 preparation - Fall 2015

Hi, I have a question about quiz preparation 3, fall 2015, question #2 Because the question asked for pentaaminebromocobalt(ii), i assumed that this is a neutral structure, and therefore put 3 bromines as means to neutralize the positive charge. However, in the answer it shows the subject to be an i...
by Lubna_Abdulmajeed_2A
Sun Nov 13, 2016 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs and naming the shape
Replies: 2
Views: 483

Re: lone pairs and naming the shape

I actually think we can't name them the same thing simply because the presence of the lone pairs DOES affect the molecular shape. For instance, the molecule with 3 bonding pairs and 1 lone pairs will not look the same as one with 3 bonding pairs alone. The lone pair will cause repulsion and push the...
by Lubna_Abdulmajeed_2A
Sun Nov 13, 2016 11:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: I'm bad at formal charge please help :(
Replies: 1
Views: 314

Re: I'm bad at formal charge please help :(

actually the formal charge on the C atom would be 0. the oxygen with the double bond will have a formal charge of 0, as you mentioned. the other two oxygens with the single bonds will have a formal charge of -1 EACH, so -2 in total, as you mentioned. However, the Carbon atom will have a formal charg...
by Lubna_Abdulmajeed_2A
Sun Nov 13, 2016 10:25 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 496

Naming

Will we be asked to name coordination compounds?
by Lubna_Abdulmajeed_2A
Thu Oct 27, 2016 8:26 pm
Forum: Trends in The Periodic Table
Topic: Question 93, Chapter 2 [ENDORSED]
Replies: 2
Views: 427

Question 93, Chapter 2 [ENDORSED]

This is a question that has to do with atomic radium and ionic radius. "Below is pictured the reaction between an atom of sodium and an atom of chorine. Identify each element and the ions formed and explain your reasoning." A (smaller atom) + B (larger atom) --> C (larger atom) + D (smalle...
by Lubna_Abdulmajeed_2A
Mon Oct 24, 2016 12:57 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: ch3 #49
Replies: 1
Views: 250

Re: ch3 #49

So, the answer is actually a triple bond between N & O. A triple bond will result in the following formal charges: O: 6-(2+3)=+1 N:5-(2+3)=0 and the overall charge of the molecule would be +1. If we were to only place a double bond between the N & O, then the formal charge will actually be: ...
by Lubna_Abdulmajeed_2A
Mon Oct 24, 2016 12:45 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Resonance
Replies: 1
Views: 413

Re: Resonance

Whenever the compound can be drawn using multiple lewis structure diagrams, then there is resonance. Usually, this happens with alternating the location of a double bond if possible.
by Lubna_Abdulmajeed_2A
Tue Oct 18, 2016 12:43 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity [ENDORSED]
Replies: 3
Views: 634

Electron Affinity [ENDORSED]

Hello,
can someone please elaborate on the concept of electron affinity. What does a negative value mean as oppose to a positive one? and why do oxygen and sulfur have both a negative & a positive value?

Thank you!

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