Search found 14 matches

by Samantha Geere
Sun Feb 28, 2016 7:16 pm
Forum: *Alkenes
Topic: Geometric Isomer
Replies: 1
Views: 330

Re: Geometric Isomer

This website has a good description of what you are asking https://www.utdallas.edu/~scortes/ochem/OChem1_Lecture/Class_Materials/05_orbitals_hybrid_geom.pdf"onclick="window.open(this.href);return false; Here is a bit of the explanation provided by the website: "When atomic orbitals (pure or hy...
by Samantha Geere
Tue Feb 23, 2016 7:53 pm
Forum: *Alkanes
Topic: IUPAC
Replies: 3
Views: 488

IUPAC

When naming an organic compound with more than one substituent, how do you know which one is placed first in the name?
by Samantha Geere
Sun Feb 14, 2016 8:14 pm
Forum: Second Order Reactions
Topic: Second Order Concentration
Replies: 1
Views: 400

Re: Second Order Concentration

For a second-order reaction, the rate of reaction is directly proportional to the square of the concentration of one of the reactants. This is why it is squared.

Differential Rate Law: r = k [A]^2

The rate constant, k, has units of L mole-1 sec-1.
by Samantha Geere
Sun Feb 07, 2016 12:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: The Notation for Cells
Replies: 1
Views: 309

The Notation for Cells

When analyzing the diagram for a cell, how do you know whether the diagram represents the right-handed electrode or left-handed electrode?
by Samantha Geere
Mon Jan 25, 2016 10:24 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Molar Heat Capacity
Replies: 1
Views: 348

Molar Heat Capacity

Why are the molar heat capacities of gases composed of molecules (as distinct from atoms) higher than those of monatomic gases?
by Samantha Geere
Mon Jan 11, 2016 1:09 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy and Entropy
Replies: 3
Views: 485

Re: Enthalpy and Entropy

Entropy is a measure of disorder or randomness of a system. An ordered system has low entropy. A disordered system has high entropy. Enthalpy is defined as the sum of internal energy of a system and the product of the pressure and volume of the system.
by Samantha Geere
Fri Jan 08, 2016 8:59 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 1
Views: 243

Re: Standard Enthalpy of Formation

Enthalpy is the total heat content of a system whereas the standard enthalpy of formation is the CHANGE in the heat content of a system when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.
by Samantha Geere
Mon Nov 30, 2015 10:19 pm
Forum: Conjugate Acids & Bases
Topic: Increasing Acidity
Replies: 3
Views: 833

Re: Increasing Acidity

The tendency of an atom to draw electrons toward itself increases as the oxidation number of the atom increases. For example, for HClO 4 , as the oxidation number of the chlorine atom increases, the atom becomes more electronegative. This tends to draw electrons away from the oxygen atoms that surro...
by Samantha Geere
Sun Nov 29, 2015 8:18 pm
Forum: Conjugate Acids & Bases
Topic: Increasing Acidity
Replies: 3
Views: 833

Re: Increasing Acidity

Because the H is always bonded to one of the oxygens in oxyacids, any factor that weakens the O-H bond makes the substance more acidic. As the number of oxygens bonded to the central atom increases, the oxidation number of the central atom increases. This causes a weakening of the O-H bond strength ...
by Samantha Geere
Tue Nov 17, 2015 9:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Video: Lewis Structures and VSEPR
Replies: 5
Views: 805

Re: Video: Lewis Structures and VSEPR

Lewis Structures.m4v [ 292.63 MiB | Viewed 757 times ]



Video:Lewis Structures and VSEPR :uploaded version
by Samantha Geere
Mon Nov 09, 2015 6:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Cis and Trans
Replies: 1
Views: 382

Re: Cis and Trans

For geometric isomers, cis and trans indicate where individual atoms are located. An isomer with the prefix cis- indicates that two atoms are on the same side of a molecule. An isomer with the prefix trans- indicates that the two atoms are across from each other. For example, cis 1,2 dichloroethene ...
by Samantha Geere
Mon Nov 09, 2015 2:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Video: Lewis Structures and VSEPR
Replies: 5
Views: 805

Video: Lewis Structures and VSEPR

Youtube Link: https://www.youtube.com/watch?v=3AppRbq_B2o


Participants:
Sara Buchting - Discussion 3K
Lauren Garcia - Discussion 4L
Samantha Geere - Discussion 3F
by Samantha Geere
Sun Oct 25, 2015 2:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Period 3 Elements
Replies: 1
Views: 269

Re: Period 3 Elements

Period 3 elements are able to accommodate 5 or more electron pairs (more than 8 valence electrons) because they have d-orbitals in their valence shells.
by Samantha Geere
Sat Oct 10, 2015 9:34 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants & Limiting Reagents [ENDORSED]
Replies: 7
Views: 3037

Re: Limiting Reactants & Limiting Reagents [ENDORSED]

There is a subtle difference. A reactant is a directly reacting substance present at the initiation of the reaction whereas a reagent is a substance participating in a chemical reaction. While all reactants are considered reagents not all reagents are considered reactants (ex: solvents and catalysts).

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