## Search found 62 matches

Sat Mar 12, 2016 12:58 pm
Forum: *Organic Reaction Mechanisms in General
Topic: 2014 Final Question 6 Given information
Replies: 1
Views: 315

### 2014 Final Question 6 Given information

On question 6 of the 2014 final, were the reaction mechanisms drawn out and the students just had to draw where the arrows would go or did they also have to determine and right out all the molecules involved in each step?
Thu Mar 10, 2016 8:51 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst in a Reaction Mechanism
Replies: 1
Views: 597

### Catalyst in a Reaction Mechanism

If your are given the full reaction mechanism of a given chemical process how do you identify if a certain molecule or substance acts as a catalyst in the process?
Thu Mar 10, 2016 12:32 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: 2011 Final Question 1C
Replies: 1
Views: 295

### 2011 Final Question 1C

Why on question 1C of the 2011 final would NO have a greater residual entropy than BF3 at OK?
Thu Mar 10, 2016 12:31 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Final 2011 Question 1
Replies: 1
Views: 294

### Final 2011 Question 1

I have a question on both parts a and b of question 1 on the 2011 final. On #1 when it asks how much methane needs to be combusted to get 25 degree celsius liquid water to boil, why does the answer only take into account the heat to raise the water to 100 degrees and not also include the phase chang...
Wed Mar 09, 2016 7:28 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 2010 Final Question 4B
Replies: 1
Views: 277

### 2010 Final Question 4B

On the attached question, why do they take the n value in the nernst equation to be 1? Wouldn't it be 2 since 2 electrons are being exchanged in the balanced reaction?
Wed Mar 09, 2016 4:08 pm
Forum: *Electrophiles
Topic: Electrophilic Characteristics of CO2 and CH3Cl
Replies: 1
Views: 2302

### Electrophilic Characteristics of CO2 and CH3Cl

Why would CO2 and CH3Cl both be considered electrophiles. Couldn't they be nucleophiles because of the two double bons in CO2 or multiple lone pairs on a Cl ion?
Wed Mar 09, 2016 2:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 2008 Final Question 2B
Replies: 2
Views: 351

### Re: 2008 Final Question 2B

Attached is a photo of the problem
Tue Mar 08, 2016 3:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 2008 Final Question 2B
Replies: 2
Views: 351

### 2008 Final Question 2B

This question asks if a reaction given reaction has multiple steps and the ratio of step 1's equilibrium constant to step 2's is 10/1, what is deltaG(step 2), given that deltaG(step 1) is -200kJ. The final answer is -194kJ. Since deltaG=-RTlnk and the only thing changing is lnk, I thought you could ...
Thu Mar 03, 2016 9:57 am
Forum: *Alkanes
Topic: Quiz #3 Prep 1 pg 43
Replies: 1
Views: 219

### Quiz #3 Prep 1 pg 43

One of the questions on the first quiz prep(question 4) asks to draw a line structure with vinyl. Are we expected to know what vinyl is for the quiz and final?
Thu Mar 03, 2016 9:49 am
Forum: *Alkanes
Topic: Winter 2016 Quiz#3 Prep(pg43)
Replies: 2
Views: 336

### Winter 2016 Quiz#3 Prep(pg43)

On pg 43 of the quiz workbook you are asked on question 2 to name CH3CH(CH3)CH(CH2CH3)C(CH3)3. I understand that the longest carbon chain contains 5 carbons. The answer given is 2,2,4-trimethyl-3ethyl pentane. I see how you get that if you identify the main carbon line as the 4 carbons not in parent...
Mon Feb 29, 2016 9:23 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Replies: 1
Views: 306

On the course reader on page 105 the second molecule on the page has the name 3,6 dimethyl-3octene. In lecture we went over how more specifically there should be and (E) or trans at the front of the name. Why is this though? I see that on the 3rd carbon the atom that it is bonded to with highest ato...
Sun Feb 28, 2016 4:58 pm
Forum: *Alkenes
Topic: Naming Alkenes
Replies: 2
Views: 340

### Re: Naming Alkenes

Is this only an issue for alkenes?
Sun Feb 28, 2016 1:05 pm
Forum: *Alkenes
Topic: Naming Alkenes
Replies: 2
Views: 340

### Naming Alkenes

On several practice exercises at the end of Chapter 1 of the organic textbook(particularly 21-29), when it asks you to name cycloalkenes I will generally get the naming correct but then when looking at the answers in the back, many of them will have (Z) or (cis) at the beginning of the names. Will w...
Sun Feb 28, 2016 1:01 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Methods for drawing out all constitutional/geometric isomers
Replies: 1
Views: 295

### Methods for drawing out all constitutional/geometric isomers

I there any specific method?tricks to use when encountering a question that asks you to identify and draw out all constitutional and geometric isomers for a CnHm molecule where n and m are the number of carbon and hydrogen atoms respectively?
Sat Feb 27, 2016 6:53 pm
Forum: *Ketones
Topic: Organic Textbook pg62
Replies: 1
Views: 436

### Organic Textbook pg62

For quiz #3 will we need to know phenyls and also know very complicated naming such as the last two structures' names on page 62? If so... what is the reasoning behind the details of how those molecules get their names?
Sat Feb 27, 2016 2:34 pm
Forum: *Ketones
Topic: Organic Textbook pg69
Replies: 3
Views: 615

### Re: Organic Textbook pg69

If you were to put 2-butanone on an exam would it be marked as incorrect?
Sat Feb 27, 2016 12:58 pm
Forum: *Ketones
Topic: Organic Textbook pg69
Replies: 3
Views: 615

### Organic Textbook pg69

In the organic textbook on page 69, the naming of ketones is desctibed. Why on the structure that is labeled as butanone is it not 2butanone? Isnt the functional group part of the 2nd carbon in the chain?
Thu Feb 25, 2016 10:29 pm
Forum: *Cycloalkanes
Topic: Substituents of Cycloalkanes
Replies: 1
Views: 265

### Substituents of Cycloalkanes

If we prefer using the UPAC names for the substituents rather than the common names, will we ever be asked to name a cycloalkane by only being able to use the common names for its substituents?
Wed Feb 24, 2016 9:40 pm
Forum: *Cycloalkanes
Topic: Cyclohexane
Replies: 1
Views: 294

### Cyclohexane

I am looking up practice naming exercises for cycloalkanes and one is a picture cyclohexane ring structure with CH3CH2 molecules bonded at the 1 and 3 carbon positions. I am entering in that the name is 1,3 diethyl cyclohexane but the program says the diethyl portion is wrong. Can anyone help me fin...
Tue Feb 23, 2016 9:05 pm
Topic: Section 4.3 4.28
Replies: 1
Views: 292

### Re: Section 4.3 4.28

The H bonds to the the carbon with two hydrogens because this is the way in which every carbon atom will have a full octet. Atoms and molecules tend to want to reach their most stable states and that is when the atoms have full octets. The other carbon atom that does not have a full octet at the sta...
Tue Feb 23, 2016 11:54 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Hw ch4 29 & 32
Replies: 1
Views: 288

### Re: Hw ch4 29 & 32

Both graphs will follow the same general trend and appear almost identical. However, we often define the Gibbs free energy graph as the standard graph for depicting transition states and reaction mechanisms and their energy changes. In the topics we are discussing with thermodynamics, knowing potent...
Sat Feb 20, 2016 12:38 pm
Forum: *Nucleophiles
Topic: Nucleophile clarification
Replies: 1
Views: 355

### Re: Nucleophile clarification

I think that if you encounter a double or triple bond it will almost always act as a nucleophile while the other compound will break apart and a portion of it will act as the electrophile.
Thu Feb 18, 2016 2:18 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Quiz Prep #1 Winter 2016 Question 7
Replies: 1
Views: 287

### Quiz Prep #1 Winter 2016 Question 7

Question #7 involves a reaction tgat has 3 mechanisms/steps. It ask from this to formulate the rate constant. The slowest step is NO+NO->N2O2. I get that the slowest step determines the reaction rate but how do you determine the reaction order?
Thu Feb 18, 2016 2:14 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Quiz Prep #2 Winter 2016 Question 5
Replies: 1
Views: 294

### Quiz Prep #2 Winter 2016 Question 5

On question 5 of the 2nd quiz prep, why when activation energy is low does temperature not greatly affect the reaction rate?
Wed Feb 17, 2016 10:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies Question #1 Midterm
Replies: 1
Views: 206

### Bond Enthalpies Question #1 Midterm

On question #1 of the midterm my method was to label and list the bonds of the reactants and the bonds of the products and compare the lists to see which bonds were formed/ broken. I then summed the bond enthalpies for the bonds formed and subtracted from it the sum of the bond enthalpies of the bon...
Thu Feb 11, 2016 1:20 pm
Forum: First Order Reactions
Topic: Book Problem 15.21
Replies: 5
Views: 606

### Book Problem 15.21

Problem 15.21 of the book involves a scenario in which you administer to a patient 20.mg of a beta blocking drug. The reaction that eliminates the drug from the body is a first order reaction with a k of 7.6x10^-3 min^-1. The question ask what mass of the beta drug will still be in the body after 5 ...
Tue Feb 09, 2016 7:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: H+ Ion in Question 7C of 2014 Midterm
Replies: 1
Views: 232

### H+ Ion in Question 7C of 2014 Midterm

Question 7C involves writing the cell diagram for the reaction of solid zinc, aqueous nitrate, and aqueous hydrogen ions to form Zinc2+, nitrogen dioxide gas, and liquid water. The cell diagram includes the H+ ions. Why is this since the hydrogen is not being reduced? Would we be marked down if we d...
Tue Feb 09, 2016 3:05 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 2013 Midterm Question 6B
Replies: 1
Views: 273

### 2013 Midterm Question 6B

Question 6B asks if based on the sign, we can tell the spontaneity of a reaction given a certain value. Two of the values it ask about are change in entropy and total change in entropy. The answer says for change in entropy we can not tell but for total change in entropy we can. How do we know that ...
Tue Feb 09, 2016 2:20 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reactions with Multiple Reactants
Replies: 1
Views: 353

### Reactions with Multiple Reactants

Why in the section in the course reader(pg. 69) when discussing finding the mechanisms and profiles of a reaction do we perform the method in which we go through multiple separate steps in which we reduce one of the reactants concentrations to a very small amount?I understand that to see how a react...
Sun Feb 07, 2016 2:44 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 2010 Midterm Question #3 Part B
Replies: 1
Views: 295

### 2010 Midterm Question #3 Part B

Question 3 involves a thermodynamic process in which a system is kept at 300K and is free to expand. In Part A it asks for q, w, deltaU, and deltaS for the system assuming it undergoes isothermal, reversible expansion. Part B asks for the same values but now assuming it is an isothermal, free expans...
Sat Feb 06, 2016 12:54 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 2009 Midterm Question #2 Part C
Replies: 1
Views: 289

### 2009 Midterm Question #2 Part C

Question #2 part C of the 2009 midterm asks what the change in internal energy is for the combustion reaction of 2 moles of butane. However, it specifies that the reaction occurs at 1atm and 300degrees celcius. The answer to part c is -5.77x10^6J but wouldn't change in internal energy be 0 because t...
Thu Feb 04, 2016 2:20 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 1
Views: 209

### Concentration Cells

Why in concentration cells does the lower concentrated solution become the anode and the higher concentration the cathode?
Tue Feb 02, 2016 6:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Adding a Conductor as an Electrode
Replies: 1
Views: 184

### Adding a Conductor as an Electrode

When exactly in a cell diagram do you add a metal like platinum that is a good conductor to a cell diagram?
Tue Feb 02, 2016 6:21 pm
Forum: Balancing Redox Reactions
Topic: Redox reactions in Which One Element Oxidized&Reduced
Replies: 1
Views: 158

### Redox reactions in Which One Element Oxidized&Reduced

In some of the book problems such as 14.5 part b, one element(in this case Br2) is both reduced and oxidized. I am able to get the final balanced redox reaction but when I get my half reactions and add them together, the coefficients are correct but a lot of times are not in their lowest possible st...
Tue Feb 02, 2016 5:16 pm
Forum: Balancing Redox Reactions
Topic: 14.1 Book HW
Replies: 3
Views: 488

### 14.1 Book HW

Question 14.1 involves the compounds Cr2O7^2- and C2H5OH reacting with an H+ ion to form Cr^3+, C2H4O, and water. After looking at the answer in the solutions manual it says Cr is reduced from 6+ to 3+ which matches my answer. However, it says C is oxidized from -2 to -1. I am having trouble underst...
Mon Feb 01, 2016 4:24 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: How pH meters use the Nernst Equation
Replies: 1
Views: 1074

### How pH meters use the Nernst Equation

In lecture today we discussed the nernst equation and how it can pH meters use it to calculate solutions pH. I understand the general idea that the meter will use the electric potentials and knowledge that within the [p](product concentration) is the H+ ion concentration of the solution, which deter...
Sat Jan 30, 2016 5:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculation Standard Cell Potentials
Replies: 2
Views: 397

### Calculation Standard Cell Potentials

In the course reader and in lecture we discussed how sometimes two half reactions will both be reductions, leading us to flip the sign and order of one of the chemical equations. In lecture we did this with zinc and copper and when we flipped the copper reaction to make it the anode we got E=-0.77 a...
Tue Jan 26, 2016 1:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Quiz 1 Prep #8
Replies: 3
Views: 457

### Re: Quiz 1 Prep #8

This reaction involves simply breaking the Cl-Cl bond into plain unbonded Cl. Whenever you break a bond, heat must be added. Since only the Cl-Cl bonds are broken and no bonds are formed, we know the reaction is endothermic, taking in heat. This means that deltaH is positive and deltaS is positive t...
Tue Jan 19, 2016 1:58 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible vs Irreversible
Replies: 1
Views: 220

### Re: Reversible vs Irreversible

A state function is essentially a variable or value that is not dependent on the path it has taken to reach its current value. That means that when discussing entropy changes, we are only concerned with initial and final values and can disregard how those values were achieved since entropy is a stat...
Tue Jan 19, 2016 1:54 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: HW 9.1 Rate of entropy of generation
Replies: 1
Views: 708

### Re: HW 9.1 Rate of entropy of generation

Since the value qrev in this case will be the heat you body is giving off, it will be a negative value. During this process, your body is losing heat. Therefore, the surroundings are gaining heat and the heat gained is -qrev, since the problem and solutions manual assigns the variable qrev to be the...
Mon Jan 11, 2016 8:55 pm
Forum: Phase Changes & Related Calculations
Topic: Methods of Enthalpy Change
Replies: 1
Views: 364

### Re: Methods of Enthalpy Change

To know which method to use regarding enthalpy changes involving different reactions you must look at what information you are provided and then decide which method is best for the given information. Usually there is only one method that works with what is given. If you are given the reaction and ar...
Mon Jan 11, 2016 8:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Using Volume of Solution for Calorimetry Calculations
Replies: 1
Views: 388

### Re: Using Volume of Solution for Calorimetry Calculations

The method you are referencing would be completely fine in solving the specific example. However, first you would have to calculate the number of moles of water using the formula M=n/v and then using its molar mass calculate the amount of water in grams. Since we are given the volume of water alread...
Thu Jan 07, 2016 10:28 pm
Forum: Phase Changes & Related Calculations
Topic: Temperature V. Thermal Energy
Replies: 1
Views: 253

### Re: Temperature V. Thermal Energy

The trouble when learning about thermal energy(heat) and temperature is that when discussing the two values in terms of thermochemistry and thermodynamics although the two values are related, they are not synonymous even though in our everyday lives we use the terms interchangeably. Also, let's say ...
Tue Jan 05, 2016 10:55 am
Forum: Phase Changes & Related Calculations
Topic: Temperature Vs. Heat
Replies: 5
Views: 983

### Re: Temperature Vs. Heat

State properties are one in which change in the variable can simply be calculated by doing the final value subtracted by the initial value. For temperature this works because let's say you start at 45 degrees celcius and then go down to 20 degrees celcius and then up to 60 degrees celcius, the chang...
Thu Dec 03, 2015 8:17 am
Forum: *Indicators
Topic: What to know for indicators
Replies: 1
Views: 716

### What to know for indicators

In terms of the final exam, should we just know the function of indicators and how they help one determine when they have reached the stochiometric point or should we also memorize the list of names and their respective color transitions also?
Tue Dec 01, 2015 11:01 am
Forum: *Titrations & Titration Calculations
Topic: Titration and how it works
Replies: 1
Views: 313

### Titration and how it works

Hi! I just want to make sure I am getting the fundamentals of the titration process. The goal is to find the concentration of a solution so you add either a strong acid or base depending on whether the solution is acidic or basic. You continue to add your strong base or acid until you reach the stoc...
Tue Dec 01, 2015 10:55 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Salts' Function In Buffers
Replies: 3
Views: 534

### Salts' Function In Buffers

Yesterday in lecture professor Lavelle emphasized the importance of salt in a buffer. I grasped what he was saying about that if your buffer is a weak acid and it's conjugate base, the addition of a salt will allow the base concentration to rise and a 1:1 weak acid to conjugate base concentration wi...
Tue Nov 24, 2015 11:15 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Buffers and their functions
Replies: 1
Views: 357

### Buffers and their functions

After lecture yesterday, I understand that the main purpose of a buffer is to maintain the ph of a certain solution. I realize that this is essential for human life and biology because the ph of blood must be maintained very carefully and soil ph must stay relatively constant for plant life to grow....
Tue Nov 17, 2015 8:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Diethylenetriamine
Replies: 2
Views: 463

### Diethylenetriamine

How many bonds can (dien) make with a transition metal?
Mon Nov 16, 2015 7:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and their Characteristics
Replies: 1
Views: 240

### Ligands and their Characteristics

For Quiz #3, what is the method/process when given the molecular formula of a ligand in determining whether it is mono or polydentate and if polydentate how many possible bonds it can make with the transition metal?
Mon Nov 16, 2015 7:53 pm
Forum: Naming
Topic: General Rules and Exceptions to Naming Coordination Compound
Replies: 1
Views: 266

### General Rules and Exceptions to Naming Coordination Compound

With Quiz #3 coming up I was looking over the course reader and the section on coordination compound naming rules and am very confused. I also google rules on naming coordination compounds and a lot of it is straightforward but there seems to be various exceptions for multiple different compounds, e...
Sat Nov 14, 2015 8:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient Less than or Greater than 1 [ENDORSED]
Replies: 3
Views: 3082

### Reaction Quotient Less than or Greater than 1[ENDORSED]

I was doing the practice modules on chemical equilibrium and one question asks what happens when Q>1 and when Q<1. Can't you not really tell though unless you know K. I know that if Q>1 the products are favored in the reaction but that does not necessarily mean the reaction will shift to the left to...
Mon Nov 09, 2015 9:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Poly vs Mono dentates
Replies: 1
Views: 352

### Ligands and Poly vs Mono dentates

I was just looking through some of the homework problems for the coordination compound chapter and several of them involve recognizing whether a ligand is a polydentate or not. For instance a question make is is carbonate a polydentate or monodentate. How exactly do you know whether a ligand has the...
Tue Nov 03, 2015 4:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations and f orbitals
Replies: 1
Views: 258

### Electron Configurations and f orbitals

I am studying for Wednesday's midterm by looking through a workbook of the past 10 midterms of Dr. Lavelle's class. I encountered one or two electron configuration questions in the earlier exams that involved atoms at the n=5 level and containing f orbitals. However, I know some of the rules we lear...
Mon Nov 02, 2015 7:39 pm
Forum: Hybridization
Topic: Hybridization Involving Tryptophan
Replies: 1
Views: 995

### Hybridization Involving Tryptophan

I was just going over the 2011 Midterm and am having a lot of trouble with question 6c. I understand why the carbon atoms' hypridozation is sp2. However I am having a lot of trouble seeing why the Nitrogen and Oxygen atoms have an sp3 hyribidization.
Sun Nov 01, 2015 5:59 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarity of AX5 molecule
Replies: 1
Views: 687

### Polarity of AX5 molecule

I am currently doing practice problems for the upcoming midterm and started doing Question 7 on the 2009 midterm. I got that AsCl5 has a VSEPR formula of AX5. I would have guessed this would have been a polar molecule but the answer key states it is nonpolar. Any explanation of why?
Tue Oct 27, 2015 10:25 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Energy Levels of Different Orbitals
Replies: 1
Views: 193

### Energy Levels of Different Orbitals

When drawing a molecular orbital diagram I know the structure of where you place each orbital, for example a sigma 2s bond depends on that orbital's respective energy level. So I understand why a pi bond is higher energy than a sigma bond since pi bonds are mainly involved in double and triple bondi...
Tue Oct 20, 2015 5:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Shapes and Lone Pair Electrons on central atom
Replies: 1
Views: 221

### VSEPR Shapes and Lone Pair Electrons on central atom

I was just doing the VSEPR and molecular shape homework problems and a few questions came to mind. I'm using the 5th edition of the book so I am not sure if the problem numbers will correspond to the newer version. First, on Chapter 3 #9b the ICl3 molecule is said to take on a T shape with 2 lone el...
Tue Oct 13, 2015 9:05 pm
Forum: Lewis Structures
Topic: Lewis Structures with multiple joined molecules
Replies: 1
Views: 296

### Lewis Structures with multiple joined molecules

I was doing several of the homework problems assigned for lewis structures and am just having little trouble with drawing the structures for compounds with multiple molecules in them such as CH3OH. When i first look at this compound i am tempted to put carbon in the center of the lewis structure and...
Tue Oct 13, 2015 8:53 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula Quiz#1 Question
Replies: 1
Views: 400

### Molecular Formula Quiz#1 Question

On the self prep quiz #1 I am having trouble with question 9. I calculated that within a 100g sample of the unknown compound you get 3.283moles Carbon, 3.286moles Oxygen, and 7.817moles Hydrogen. When I divide all those values by the smallest number of moles(3.283) I do not get a whole number for 7....
Tue Oct 06, 2015 12:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 1
Views: 254

### Writing Electron Configurations

So yesterday(10/5/15) in lecture Professor Lavelle went over the conceptual basics behind atomic orbitals and electron configurations. I was a little confused after lecture because I hadn't covered that material in a while. As I think about it more and more I am beginning to grasp the concepts discu...
Wed Sep 30, 2015 9:33 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formulas and Rules for Figuring out their Names
Replies: 4
Views: 722

### Molecular Formulas and Rules for Figuring out their Names

I know that certain molecular formulas of compounds and ions are commonly used and usually need to be remembered such as corbonate(CO3-) or phosphate(PO4-). I also know there are some general rules for naming molecular compounds which include using the greek term to reference the number of moles of ...