Search found 22 matches
- Mon Mar 07, 2016 2:32 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Importance of Cis and Trans Isomers
- Replies: 1
- Views: 302
Importance of Cis and Trans Isomers
What are the implications of cis and trans isomers? Why are they biologically significant?
- Mon Feb 29, 2016 7:12 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Types of Reactions
- Replies: 1
- Views: 359
Types of Reactions
I'm studying for Quiz #3, and I want to make sure I know all the types of reaction mechanisms for organic molecules. Can anyone list them? Thank you!
- Mon Feb 29, 2016 7:10 pm
- Forum: *Alkenes
- Topic: Naming Alkenes
- Replies: 2
- Views: 544
Re: Naming Alkenes
Thank you so much!
- Fri Feb 26, 2016 10:10 pm
- Forum: *Alkenes
- Topic: Naming Alkenes
- Replies: 2
- Views: 544
Naming Alkenes
I'm really struggling with learning how to name alkenes. Can anyone provide any tips or tricks on how to name them?
- Wed Feb 17, 2016 5:01 pm
- Forum: General Rate Laws
- Topic: Rate Constant "k"
- Replies: 1
- Views: 341
Rate Constant "k"
How is the rate constant "k" affected by an increase in temperature in a first, second, and zero order reaction?
- Sun Feb 07, 2016 10:17 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Ideal Gases
- Replies: 1
- Views: 378
Ideal Gases
When calculating the entropy for an ideal gas, under what conditions do you use 3/2R and the 5/2R? Are they to be used during any ideal gas calculation?
- Sun Feb 07, 2016 10:04 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy and Temperature
- Replies: 1
- Views: 320
Enthalpy and Temperature
What is the connection between enthalpy and temperature? For example in an adiabatic system, is temperature changing?
- Wed Feb 03, 2016 11:15 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Enthalpy Fusion and Enthalpy Vaporization
- Replies: 2
- Views: 467
Enthalpy Fusion and Enthalpy Vaporization
Why is it that the temperature doesn't change for the the enthalpy fusion or enthalpy vaporization on a heating curve?
- Wed Jan 27, 2016 9:47 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Change in Internal Energy
- Replies: 1
- Views: 390
Change in Internal Energy
Can someone clarify the different equations and their meanings regarding change in internal energy. How is it that an isothermal reaction produces 0 change in internal energy?
- Thu Jan 21, 2016 8:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy
- Replies: 2
- Views: 477
Internal Energy
How is Internal Energy a state function if work and heat are both path functions?
- Thu Jan 21, 2016 8:31 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Reversible and Irreversible Reactions
- Replies: 2
- Views: 401
Reversible and Irreversible Reactions
I'm still confused on reversible and irreversible reactions. How do I differentiate between the two? Which equations do I use depending on the reaction?
- Thu Jan 14, 2016 7:54 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Irreversible Process vs. Reversible Process
- Replies: 1
- Views: 339
Irreversible Process vs. Reversible Process
I understand that an irreversible process isn't at equilibrium because a certain direction reaction is favored, but why does that make it less efficient than a reversible process? Why is a reversible process more efficient?
- Fri Jan 08, 2016 3:33 pm
- Forum: Phase Changes & Related Calculations
- Topic: Calculating Enthalpy with Bond Enthalpies
- Replies: 2
- Views: 620
Calculating Enthalpy with Bond Enthalpies
When calculating the total enthalpy for a reaction using bond enthalpies, what is the easiest way to determine which bonds are broken and being formed? Is it best to draw the lewis structures and solve it that way?
- Sun Nov 29, 2015 8:34 am
- Forum: Lewis Acids & Bases
- Topic: Acids & Bases
- Replies: 2
- Views: 634
Re: Acids & Bases
Thank you!
- Sat Nov 28, 2015 9:51 pm
- Forum: Lewis Acids & Bases
- Topic: Acids & Bases
- Replies: 2
- Views: 634
Acids & Bases
How do I determine if an oxide is acidic, basic, or amphoteric based on its chemical formula?
Example:
A) BaO
B) SO3
C) As2O3
d) Bi2O3
Example:
A) BaO
B) SO3
C) As2O3
d) Bi2O3
- Tue Nov 17, 2015 2:48 pm
- Forum: Naming
- Topic: Video: Formula of A Coordination Compound
- Replies: 2
- Views: 393
- Mon Oct 26, 2015 8:46 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 1
- Views: 330
Lewis Structures
In high school chemistry, I learned the molecular structures of Square Pyramid (AX6E) and T-Shaped (AX5E2 and AX6E3). Do we need to know these for our quiz/midterm?
- Mon Oct 26, 2015 8:43 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 3
- Views: 432
Re: Formal Charge
Thank you so much!
- Sun Oct 25, 2015 9:12 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 3
- Views: 432
Formal Charge
Can someone explain formal charge to me? 1) how do you determine the formal charge of an atom? I've seen different methods for it, but which is best? 2) what does this value tell you about the molecule? Thank you!
- Tue Oct 20, 2015 10:33 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 2
- Views: 318
Lewis Structures
Regarding Lewis Structures, is there a difference between electron arrangement and molecular structure? For example if a compound is AX3E (4 electron pairs, with 3 bonded pairs) is the electron arrangement tetrahedral and the molecular structure seesaw?
- Sun Oct 11, 2015 4:32 pm
- Forum: Empirical & Molecular Formulas
- Topic: Quiz 1 Preparation, Question #9
- Replies: 1
- Views: 618
Quiz 1 Preparation, Question #9
9. Xylitol, a sugar substitute, has a mass composition of C 39.43%, O 52.58%, H 7.88% and a molar mass of 152.15 g/mol. What is its molecular formula? I know this is a quiz for a grade, but I had a question regarding the composition of the compound. 39.43 + 52.58 + 7.88 adds up to 99.89. Therefore, ...
- Fri Oct 02, 2015 4:05 pm
- Forum: Properties of Electrons
- Topic: Homework 1.25
- Replies: 1
- Views: 388
Homework 1.25
How do I solve question #1.25 (a)?
1.25: Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589nm. How much energy is emitted by
a) an excited sodium atom when it generates a photon
which equation do I use and how do I set it up? Thank you!
1.25: Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589nm. How much energy is emitted by
a) an excited sodium atom when it generates a photon
which equation do I use and how do I set it up? Thank you!