Search found 20 matches

by Michelle Luong 1H
Sun Feb 28, 2016 6:18 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Steric Contribution
Replies: 1
Views: 274

Steric Contribution

In simple terms, what is a steric contribution and in what cases would it yield a favorable/unfavorable contribution?
by Michelle Luong 1H
Sun Feb 28, 2016 6:08 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Standard Gibbs free energy and Enthalpies of Activation
Replies: 1
Views: 438

Standard Gibbs free energy and Enthalpies of Activation

Why is the Standard Gibbs free energy of activation (double dagger) always a positive value? And why is Standard ethalpies of activation (double dagger) always positive?
by Michelle Luong 1H
Sat Feb 27, 2016 1:53 am
Forum: *Alcohols
Topic: Propanol
Replies: 1
Views: 357

Propanol

For CH3CHOHCH3, it's 2-propanol, but why is it 2-propanol and not just 1-propanol? I thought that if you count the carbons from right to left, the "O" would be attached to the first carbon. Am I just wrongly visualizing it?
by Michelle Luong 1H
Mon Feb 22, 2016 10:21 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation Energy with Relation to k
Replies: 1
Views: 321

Activation Energy with Relation to k

So, when k is low, Activation energy is high? Why?
by Michelle Luong 1H
Fri Feb 12, 2016 10:29 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre equilibrium Approach
Replies: 1
Views: 264

Pre equilibrium Approach

Is the pre equilibrium approach only used when the slow step is preceded by the fast step?
by Michelle Luong 1H
Thu Feb 04, 2016 5:07 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram Inert Electrodes
Replies: 1
Views: 232

Cell diagram Inert Electrodes

How do we know when we need to write the cell diagram with an inert electrode? For example, how do we know we need Pt l I- l I2 ll Ce4+, Ce3+ l Pt VS Zn2+ l Zn l Ni2+ l Ni ?
by Michelle Luong 1H
Fri Jan 29, 2016 8:45 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Free Expansion
Replies: 4
Views: 646

Free Expansion

How do we know if a system is doing free expansion and the work is therefore 0?
by Michelle Luong 1H
Mon Jan 25, 2016 12:23 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Determining Spontaneity
Replies: 7
Views: 372

Determining Spontaneity

So a system is spontaneous when DeltaG is negative and also when Delta S total is positive. But why can't we tell the spontaneity of a system by looking at Delta H? I know when Delta H is negative, it's exothermic, but why can't we tell if the reaction is spontaneous just by looking at Delta H?
by Michelle Luong 1H
Sat Jan 16, 2016 12:34 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Equations for Enthalpies of Formation
Replies: 1
Views: 223

Equations for Enthalpies of Formation

So, when you're asked to the find the enthalpy of formation for a compound without being given a chemical reaction equation, how are you supposed to know what equation to use? For example, when they just ask us to find C6H6(g), how are we supposed to know that the full chemical equation is 6C(gr) + ...
by Michelle Luong 1H
Fri Jan 08, 2016 12:52 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Formation Enthalpies
Replies: 1
Views: 169

Formation Enthalpies

So, deltaH = deltaH of the products minus the deltaH of the reactants. Do I just plug in the standard enthalpies of formation just like that or do I have to do something with the signs?
by Michelle Luong 1H
Sat Nov 28, 2015 5:29 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relation between IOH and ClOH
Replies: 2
Views: 3793

Relation between IOH and ClOH

So, HF < HCl < HBr < HI, in order of increasing acidity. So then why is IOH < BrOH < ClOH in order of increasing acidity? I know HF is weaker than the other binary acids going down a column because of weaker bond strength, but then why is IOH less acidic than ClOH? Is it because of electronegativity?
by Michelle Luong 1H
Tue Nov 24, 2015 1:08 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong acids
Replies: 1
Views: 318

Strong acids

How do we tell if the acid is strong or not? I get the periodic trend of the acidity increasing as you go down a column, but what about acids like H2SO4? Is it something that we're supposed to memorize?
by Michelle Luong 1H
Tue Nov 24, 2015 1:01 am
Forum: Lewis Acids & Bases
Topic: Lewis Acids/Bases and relation to Bronsted Acids/bases
Replies: 1
Views: 3858

Lewis Acids/Bases and relation to Bronsted Acids/bases

So, every bronsted base is a lewis base, but not every lewis base is a bronsted base. Why is that? And can you give me an example?
by Michelle Luong 1H
Sun Nov 15, 2015 6:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ethylenediamine and edta
Replies: 1
Views: 382

Ethylenediamine and edta

So I know that Ethylenediamine (en) is bidental and edta is hexadental. How does this affect the coordination number of the whole molecule?
by Michelle Luong 1H
Sat Nov 07, 2015 5:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 1
Views: 196

Re: Q and K

Q is a ratio of the concentrations of the products and the reactants: (products) / (reactants). At K, the ratio of the products equal the reactants. When Q>K, this means that there is a greater concentration of products than reactants. In order to balance out the concentrations and achieve equilibri...
by Michelle Luong 1H
Fri Oct 30, 2015 1:48 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Polarizability
Replies: 2
Views: 279

Re: Polarizability

An atom with high polarizabililty tells us that its electron cloud is easily distorted and electrons are more easily pulled away from the central atom. These atoms form bonds with greater covalent character because the electron is pulled further between the two bonding molecules, making it seem like...
by Michelle Luong 1H
Sun Oct 25, 2015 1:37 am
Forum: Dipole Moments
Topic: polarizability in ionic model
Replies: 1
Views: 309

Re: polarizability in ionic model

Ions that have a higher polarizability means that the electron cloud is distorted, and the electrons are pulled out farther from the nucleus towards the other atom. This results in more covalent character because instead of being given up by one atom and taken up by another, the electrons seem to be...
by Michelle Luong 1H
Fri Oct 16, 2015 1:07 am
Forum: Lewis Structures
Topic: Various Lewis Structures
Replies: 2
Views: 280

Re: Various Lewis Structures

One version of a Lewis structure may be more stable than the others. So, If it is more stable, it is "better" than the other variations of the Lewis Structure.
by Michelle Luong 1H
Fri Oct 09, 2015 9:25 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum numbers in an atom
Replies: 1
Views: 382

Re: Quantum numbers in an atom

So 1 single electron has 4 numbers to describe it: n, l, ml, and ms. Since the problem has already named 3 of the 4 quantum numbers to describe the electron, we look at ms, the spin of the electron. We have two choices: spin up or spin down (+1/2 or -1/2). So the number of electrons that could have ...
by Michelle Luong 1H
Fri Oct 02, 2015 9:25 pm
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 2
Views: 432

Re: Schrodinger Equation

Schrodinger's wave function equation uses a wave function to describe an electron in an atom.

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