Search found 22 matches

by Miriam Velez 1I
Fri Mar 11, 2016 9:26 pm
Forum: *Aldehydes
Topic: Winter Final 2014 Q8B
Replies: 2
Views: 800

Re: Winter Final 2014 Q8B

Thanks!
by Miriam Velez 1I
Thu Mar 10, 2016 5:15 pm
Forum: *Aldehydes
Topic: Winter Final 2014 Q8B
Replies: 2
Views: 800

Winter Final 2014 Q8B

On the Winter 2014 Final Q8B why is the aldehyde named butanal and not butenal? Is the double bond implied?
by Miriam Velez 1I
Sun Mar 06, 2016 12:31 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair vs Boat Conformation
Replies: 2
Views: 528

Chair vs Boat Conformation

Why is the chair conformation more stable then the boat conformation?
by Miriam Velez 1I
Sat Feb 27, 2016 11:17 am
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: cis Z and trans E and double bonds
Replies: 1
Views: 388

cis Z and trans E and double bonds

Can someone explain how to tell if an organic molecule is cis or trans when a double bond is involved? It's hard for me to tell when the structure is drawn with lines.

Thanks.
by Miriam Velez 1I
Sun Feb 21, 2016 9:12 pm
Forum: *Alkanes
Topic: Double bond of an alkene
Replies: 3
Views: 454

Double bond of an alkene

On page 85 of the course reader (at the bottom), it says - electrons of the double bond react as a necleophile. Is it always the electrons or can it also be the electrons? Why or why not?
by Miriam Velez 1I
Fri Feb 19, 2016 8:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Spontaneous Rxn vs Energetically Favorable
Replies: 1
Views: 744

Re: Spontaneous Rxn vs Energetically Favorable

An energetically favorable reaction is a spotaneous reaction. If the graph of reactions and products versus free energy (Delta G) shows that the reactants are at a higher energy then the products, the reaction is spontaneous. (You calculate that by DeltaG=DeltaG P -DeltaG R , your products are at a ...
by Miriam Velez 1I
Fri Feb 12, 2016 7:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to add Pt(s)
Replies: 2
Views: 2751

When to add Pt(s)

If a redox reaction has a solid as part of the product, (Ex: MnO4(aq)- --> MnO2(s)) do you always add Pt(s)? Or under what conditions do you have to add Pt(s)?
by Miriam Velez 1I
Fri Feb 12, 2016 7:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: How to separate solids in a cell diagram
Replies: 3
Views: 453

How to separate solids in a cell diagram

Ex) MnO4-(aq) --> MnO2(s)

For this reaction you would have to add Pt(s) but would you seperate MnO2(s) and Pt(s) with a comma or a bar?

Thanks
by Miriam Velez 1I
Fri Feb 05, 2016 2:10 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: When to use molar heat capacity vs specific heat capacity
Replies: 1
Views: 452

When to use molar heat capacity vs specific heat capacity

From Midterm 2011 Q3 (on the course reader): "Suppose that 50.0 g of H2O(l) at 20.0 C is mixed with 65.0 g of H20(l) at 50.0 C at constant atmospheric pressure in a thermally insulated vessel. Calculate delta S and delta S total." Why did they use molar heat capacity to solve this instead ...
by Miriam Velez 1I
Fri Jan 29, 2016 10:03 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Measuring e- Transfer
Replies: 1
Views: 272

Measuring e- Transfer

On page 49 of the course reader, it says, "Cannot measure e- transfer of one cell". I am not sure what this statement means. And by cell, is it referring to anode or cathode?
by Miriam Velez 1I
Fri Jan 22, 2016 9:11 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous Reactions at certain temperatures
Replies: 2
Views: 484

Spontaneous Reactions at certain temperatures

How can we tell when a reaction is spontaneous at certain temperatures based on change in entropy and change in enthalphy? Theres a chart on the course reader but I do not understand how a reaction can be spontaneous at a high temp. when change in entropy and enthalphy is positive, for example.
by Miriam Velez 1I
Fri Jan 15, 2016 6:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Signs for enthalpy
Replies: 3
Views: 547

Signs for enthalpy

Can someone please explain why enthalpy is negative when a bond is formed? And positive when a bond is broken?
by Miriam Velez 1I
Fri Jan 08, 2016 10:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalphy of a reaction
Replies: 3
Views: 389

Standard Enthalphy of a reaction

In the course reader, there is an example about standard enthalphy of combustion of methane. The problem says to "make sure everything is in standard state..." but I am a little bit confused by this statement. What if the compounds weren't in standard state? How do we convert the enthalphy...
by Miriam Velez 1I
Fri Nov 27, 2015 3:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question on Quiz 3 Prep Fall 2014
Replies: 1
Views: 301

Re: Question on Quiz 3 Prep Fall 2014

Because for [Products] you have [x][x] which is the same as x^2
by Miriam Velez 1I
Fri Nov 27, 2015 3:02 pm
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 3
Views: 558

Re: Strong Acid

According to this website: http://antoine.frostburg.edu/chem/senese/101/reactions/faq/strong-and-weak.shtml there are 6 common strong acids which you should memorize.
by Miriam Velez 1I
Wed Nov 25, 2015 10:35 am
Forum: Naming
Topic: Video:Naming Coordination Compounds
Replies: 2
Views: 480

Video:Naming Coordination Compounds

In this video we will show you how to name coordination compounds.

Worked with Sonia Perez (DIS 3I)
by Miriam Velez 1I
Tue Nov 17, 2015 10:42 pm
Forum: Naming
Topic: New IUPAC Names
Replies: 2
Views: 452

Re: New IUPAC Names

Thank you!
by Miriam Velez 1I
Tue Nov 17, 2015 5:05 pm
Forum: Naming
Topic: New IUPAC Names
Replies: 2
Views: 452

New IUPAC Names

For CN the old name is cyano but the new name is cyanido-kC. What does the -kC mean and how do we write that when writing out the name of the compound? Do we not put in the kC or do we just put it as cyanido-kC?
by Miriam Velez 1I
Wed Oct 28, 2015 6:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma pz placement for CO
Replies: 1
Views: 256

sigma pz placement for CO

Molecular orbital for CO. Since oxygen is included in this compound I thought that \sigma pz bond would be lower than the \pi px & \pi py bonds but in lecture it was not drawn that way. Instead the \sigma pz bond was drawn higher than the \pi p bonds. So if the compound includes elements before ...

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