## 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
Tue Nov 17, 2015 2:48 pm
Forum: Naming
Topic: Video: Formula of A Coordination Compound
Replies: 2
Views: 393

### Video: Formula of A Coordination Compound

MOV_0108.MOV.m4v [ 47.34 MiB | Viewed 393 times ]

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!