Search found 21 matches

by Omar Habib 3L
Wed Mar 09, 2016 5:14 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Reaction pathway graph
Replies: 1
Views: 356

Reaction pathway graph

When asked which transition state is most unstable among two transition states in a reaction pathway graph with respect to gibbs free energy, is it asking in terms of thermodynamically or kinetically unstable?
by Omar Habib 3L
Tue Mar 08, 2016 2:27 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Hw 3.15
Replies: 1
Views: 255

Re: Hw 3.15

You assign Bromine the equatorial up position because you give the bigger substituent the equatorial up position first and the smaller one (Chlorine) the axial down position. When 2 substituents are present and are connected to the same carbon, the bigger substituent gets the equatorial position whe...
by Omar Habib 3L
Thu Mar 03, 2016 10:41 am
Forum: *Electrophiles
Topic: Electrophiles and Nucleophiles only in o chem?
Replies: 3
Views: 501

Re: Electrophiles and Nucleophiles only in o chem?

Why exactly is 1,3,5-cyclohexene considered a nucleophile and is it the same as benzene? Actually, the IUPAC name for benzene is 1,3,5-cyclohexatriene since there are 3 double bonds in the structure. It is a nucleophile because it is electron rich and reacts with electrophiles, as electrophiles hav...
by Omar Habib 3L
Mon Feb 29, 2016 3:08 am
Forum: *Electrophiles
Topic: Electrophiles and Nucleophiles only in o chem?
Replies: 3
Views: 501

Re: Electrophiles and Nucleophiles only in o chem?

Electrophiles are essentially the same as Lewis Acids since they accept a pair of electrons, while a nucleophile is the same thing as a Lewis Base since it donates a pair of electrons.

In inorganic chemistry, nucleophiles are referred to as ligands.
by Omar Habib 3L
Wed Feb 17, 2016 1:48 am
Forum: General Rate Laws
Topic: Positive or negative rate constant
Replies: 1
Views: 447

Positive or negative rate constant

When calculating the initial reaction rate, do we always use a positive k? Or are there some cases when we use negative k?
by Omar Habib 3L
Tue Feb 16, 2016 6:59 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Quiz 2 prep #1
Replies: 3
Views: 397

Re: Quiz 2 prep #1

I want to say they stand for reactant and product but not totally sure.
by Omar Habib 3L
Sat Feb 06, 2016 7:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Midterm 2014 #8 Cathode vs. Anode
Replies: 1
Views: 329

Midterm 2014 #8 Cathode vs. Anode

In question 8, I'm confused on how to tell which half-redox reaction to use as the cathode and use as the anode. The two reactions are F2+ 2H+ + 2e- ---> 2HF with standard cell potential of +3.03V and F2 + 2e----> 2F- with standard cell potential of +2.87 V. The solution shows that the first reactio...
by Omar Habib 3L
Mon Feb 01, 2016 1:33 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant Change in Volume
Replies: 3
Views: 537

Re: Constant Change in Volume

No, I don't believe so since the definition of enthalpy is the amount of heat released or absorbed at a constant pressure. Also, the heat at constant volume equals to internal energy.
by Omar Habib 3L
Sun Jan 24, 2016 3:12 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.5- Initial change in entropy negative?
Replies: 2
Views: 384

Homework 9.5- Initial change in entropy negative?

For question 9.5, it asks: What is the total entropy change of a process in which 40.0 jK of energy is transferred as heat from a large reservoir at 800. K to one at 200.K? I understand how to find the total entropy of the process but was wondering why the first change in entropy is negative while t...
by Omar Habib 3L
Mon Jan 18, 2016 5:59 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: molar heat capacity
Replies: 2
Views: 343

Re: molar heat capacity

In general, heat capacity increases with molecular complexity. Thus, more atoms lead to more possible bond vibrations that absorb added energy.

For example: NO2 would have a higher heat capacity than NO.
by Omar Habib 3L
Sun Jan 10, 2016 11:02 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible and Irreversible Processes
Replies: 4
Views: 471

Re: Reversible and Irreversible Processes

A reversible process is in which a system and its surroundings can be restored to the initial state from the final state without producing any changes in the thermodynamics properties. All the changes that occur in state that occur in the system must be in thermodynamic equilibrium with each other. ...
by Omar Habib 3L
Fri Dec 04, 2015 8:40 pm
Forum: Identifying Acidic & Basic Salts
Topic: Strong Acids and Bases in Course Reader
Replies: 1
Views: 331

Strong Acids and Bases in Course Reader

Are the strong acids and bases listed in the course reader the only strong acids and bases we need to know, or are there more strong acids and bases?
by Omar Habib 3L
Sun Nov 29, 2015 12:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Midterm Question #4.B: Explaining molecule's shape
Replies: 1
Views: 284

Midterm Question #4.B: Explaining molecule's shape

For question 4, part b, on the midterm, it asked to briefly explain why each molecule has the shape that it does. The molecules were PCl5 and XeF2. I understand that for PCl5, the shape is trigonal bi-pyramidal, and for XeF2, the shape is linear. But when asked to explain, do we mainly need to discu...
by Omar Habib 3L
Sun Nov 22, 2015 9:32 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs amphiprotic
Replies: 5
Views: 13991

Re: Amphoteric vs amphiprotic

When a compound is amphoteric, it means it has both basic and acidic character. Thus, when the compound reacts with an acid, it shows that it's basic. When it reacts with a base, it shows that it's acidic. When a compound is amphiprotic, it means it can act as a proton donor and as a proton acceptor...
by Omar Habib 3L
Sun Nov 15, 2015 11:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier
Replies: 1
Views: 261

Re: Le Chatelier

If the reaction is endothermic, or requires heat, and the temperature is increased, then product formation will be favored and the equilibrium constant will increase. On the other hand, if the reaction is exothermic, or gives off heat, and the temperature is increased, then reaction formation will b...
by Omar Habib 3L
Mon Nov 09, 2015 12:06 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How does arrangement affect forming a Chelating Complex?
Replies: 2
Views: 330

Re: How does arrangement affect forming a Chelating Complex?

Typically, I believe a chelate is formed from 2 neighboring atoms, which in this case are the two NH2. According to all the diagrams, B has the 2 closest NH2. Thus, they form the chelate complex that forms a ring of atoms, including the central metal atom, which is the atom from the diaminobenzene. ...
by Omar Habib 3L
Sun Nov 01, 2015 9:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for Cr^2+
Replies: 2
Views: 1862

Re: Electron Configuration for Cr^2+

When dealing with anions, I believe you first remove the highest energy electrons first, which are the 2 electrons from the 4s orbital, opposed to taking one from the 4s orbital and one from the 3d orbital. Therefore, you wouldn't have any left from the 4s to fill the 3d orbital, leaving it as 3d^4.
by Omar Habib 3L
Sun Oct 25, 2015 9:14 pm
Forum: Hybridization
Topic: Quiz 2 Preperation #1 (Fall 2013)
Replies: 2
Views: 310

Re: Quiz 2 Preperation #1 (Fall 2013)

VictoriaRoderick_3A wrote:After I did the Lewis Structure, I got , but the answer was just ? Why is this? Should their be a 2 because it is in period 2?


On Quiz 2, will we be expected to provide the principle quantum number before the hybrid orbitals for a certain atom?
by Omar Habib 3L
Sun Oct 18, 2015 8:56 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 3
Views: 427

Re: Valence Electrons

Valence electrons are considered in the outermost shell. For example: For an element like Scandium, the ground-state electron configuration would be [Ar] 3d1 4s2. Thus, the only electrons that are considered valence electrons here are the ones part of the 4s orbital, since it's on the outermost shel...
by Omar Habib 3L
Sun Oct 11, 2015 10:33 pm
Forum: Quantum Numbers and The H-Atom
Topic: Chapter 2, Problem #29
Replies: 1
Views: 303

Chapter 2, Problem #29

When asked how many electrons can have the following quantum numbers in an atom, how do you determine the number of electrons when given a magnetic quantum number including being given the principle quantum number (n) and the angular momentum number (l)? For example: In the problem, given is b) n=4,...
by Omar Habib 3L
Thu Oct 01, 2015 8:37 pm
Forum: Photoelectric Effect
Topic: Number of max electrons emitted
Replies: 1
Views: 978

Number of max electrons emitted

How do you determine the maximum number of electrons that could be ejected from a metal surface from a given amount of high energy photons? For example: If 1 million high energy photons hit a metal surface what is the maximum number of electrons that could be ejected from the metal surface? Is the n...

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