Search found 19 matches

by Mirna_Velasco_1L
Sun Mar 19, 2017 11:20 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: When to use Cv or Cp? to calculate change in Entropy
Replies: 3
Views: 1129

When to use Cv or Cp? to calculate change in Entropy

I understand that we use Cv or Cp when the it states that its either at constant volume or pressure? But if these words are not used, and it just states that its a monatomic ideal gas, which C do use? I noticed that we normally use Cv but why?
by Mirna_Velasco_1L
Thu Mar 09, 2017 1:58 pm
Forum: *Cycloalkanes
Topic: Practice problem (Naming)
Replies: 2
Views: 360

Practice problem (Naming)

For the following molecule, why is it that 4-isobutyl is given priority in numbering than 7-Isopropyl? When I attempted this problem, wrote 4-isopropyl, 1-2, diethyl-7-isobutylcycloheptane, which is wrong? The answer should be 1,2-diethyl-4-isobutyl-7-isopropylcyclooctan. Why is it the that diethyl ...
by Mirna_Velasco_1L
Mon Mar 06, 2017 8:19 pm
Forum: *Cycloalkenes
Topic: Naming Techniques
Replies: 1
Views: 282

Naming Techniques

I am having a hard time finding the longest parenting chain in the molecule and naming molecules. I am always off by one carbon so instead of counting seven, I count six. Does any one has a technique they want to share with me? I will greatly appreciate it.
by Mirna_Velasco_1L
Sun Feb 26, 2017 9:26 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Pre-Equalibruim approach Ch15.101
Replies: 1
Views: 292

Pre-Equalibruim approach Ch15.101

For this question, it asks to find the overall reaction for the following mechanism? ClO- + H2O <---> HClO + OH- (fast equilibrium) HClO + I- <---> HIO +Cl- (very slow equilibrium) HIO + OH- <----> IO- + H2O (fast equilibrium) As the answer, I got rate law= k2 k1 [ClO-] [ I-] / k1 Reversed [ OH-] Fo...
by Mirna_Velasco_1L
Sun Feb 19, 2017 5:19 pm
Forum: General Rate Laws
Topic: Calculating Mass remaining after a certain time
Replies: 1
Views: 385

Calculating Mass remaining after a certain time

When we calculate the mass of a "something remaining" for a first order reaction, and we are given rate constant (K), an amount of "something like drug in body" and time, I understand that we have to manipulate the ln[A] = -kt + ln[A]null to find the % of initial concentration as...
by Mirna_Velasco_1L
Mon Feb 06, 2017 10:26 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating G null @ Equilibrium
Replies: 1
Views: 250

Calculating G null @ Equilibrium

Can someone please explain why G null equals 0 @ equilibrium? Aside from knowing that E null equals 0, can someone give another Explanation Please!!!!!!!
by Mirna_Velasco_1L
Sun Feb 05, 2017 7:54 pm
Forum: Balancing Redox Reactions
Topic: REDOX Reactions (Acidic vs Basic)
Replies: 1
Views: 366

REDOX Reactions (Acidic vs Basic)

If a problem given does not tells us that the redox reaction is an acid or a base, How can we tell? While doing the homework problems, I noticed that for Acid half-reactions, we balance the O's and the H's with H2O or H+ and for bases we Balance the half reactions by adding H2O to both sides of the ...
by Mirna_Velasco_1L
Sun Jan 29, 2017 7:50 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Calculating Residual Entropy
Replies: 1
Views: 1044

Calculating Residual Entropy

When calculating the Residual Entropy, I know that we have to use Boltzmann Equation DeltaS=Kb ln(w), Where Kb is a constant (1.38062 X 10^-23) and where W depends on the number of rearrangements. For example, HW problem 25, asks us to calculate the Residual molar entropy of SO2F2. Because SO2F2 can...
by Mirna_Velasco_1L
Sun Jan 22, 2017 8:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating final temperature of a solution? (HW 8.99)
Replies: 1
Views: 280

Calculating final temperature of a solution? (HW 8.99)

Question 8.99 Integrated Exercises Hydrochloric acid oxidizes zinc metal in a reaction that produces hydrogen gas and chloride ions. A piece of zinc metal of mass 8.5 g is dropped into an apparatus containing 800.0 mL of 0.500 m HCl(aq). If the initial temperature of the hydrochloric acid solution i...
by Mirna_Velasco_1L
Sun Jan 15, 2017 2:28 pm
Forum: Administrative Questions and Class Announcements
Topic: CH 8 Which HW Problems to do first?
Replies: 14
Views: 9661

Re: CH 8 Which HW Problems to do first?

Should we read all the topics of every chapter before the lectures? Or is there a certain order we are expected to read the textbook in? Also, are we supposed to do all of the homework problems before the lectures as well? We are recommended to read before lecture so we can have an understanding of...
by Mirna_Velasco_1L
Mon Dec 05, 2016 12:59 am
Forum: *Indicators
Topic: Stoichiometric point explanation [ENDORSED]
Replies: 5
Views: 1746

Re: Stoichiometric point explanation [ENDORSED]

I was also confuse on this. So I understand the the Stoichiometric point is when the moles of the base = the moles of the acid being added. So do we calculate the new molar value by calculating the moles of the base given and divide by total volume. Or is my interpretation wrong? Or how were we supp...
by Mirna_Velasco_1L
Fri Nov 25, 2016 9:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11 Qs. #67
Replies: 1
Views: 261

Chapter 11 Qs. #67

I am confuse on how to solve this problem. Can some please explain to me how to compute the values for “new initial” given in the solution manual. I understand how to solve using the original values, but I don’t understand why do we need to compute the new initial values and how to get the them in o...
by Mirna_Velasco_1L
Sun Nov 13, 2016 1:13 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Writing the formula for coordination compounds
Replies: 1
Views: 322

Writing the formula for coordination compounds

I am having trouble writing the formula for coordination compounds, especially when it comes to the charges of each atom. I am not quite sure why some charges are left out and some are included. I am not even sure if I am asking this question correctly, but for example in Pentaamminesulfatocobalt(II...
by Mirna_Velasco_1L
Sun Nov 06, 2016 2:42 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Differentiating between shapes of structure
Replies: 1
Views: 227

Re: Differentiating between shapes of structure

Yes, Z refers to atomic #. For example elements in period 1 and period 2 up to Nitrogen with a Z of 7, we draw the molecular energy level diagram with Z <8. Thus, for elements like Oxygen and Flourine we draw the diagram with Z is greater or equal to 8. Also, if I recall correctly, I remember Dr. La...
by Mirna_Velasco_1L
Thu Oct 27, 2016 11:05 am
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Character
Replies: 5
Views: 12374

Re: Ionic and Covalent Character

Vivian Wang, You said that the ionic/covalent character can be determined using the periodic table. And that the greater the difference in electronegativity between the atoms, the greater the ionic character of the bond, so does this means that if there is not much difference in electronegativity be...
by Mirna_Velasco_1L
Sat Oct 22, 2016 6:39 pm
Forum: Trends in The Periodic Table
Topic: Ch2 Q.71 Diagonal Relationship
Replies: 1
Views: 356

Ch2 Q.71 Diagonal Relationship

Can someone please explain to me what exactly is the Diagonal relationship and how does it arises? I read the section in the book, but I am still confuse. I will greatly appreciate your help!
by Mirna_Velasco_1L
Mon Oct 17, 2016 9:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Question ch2 #19
Replies: 1
Views: 290

HW Question ch2 #19

Can someone please explain to me why is that 3 values of ml are allowed for an electron in a 6d subshell ? I know that l=2 has 3 values of ml (-1,0,+1) and it is 3d, so I thought I just had to double it, but guess I am wrong. I will greatly appreciate your help.
by Mirna_Velasco_1L
Fri Oct 07, 2016 4:01 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg's Indeterminacy Equation Clarification [ENDORSED]
Replies: 3
Views: 726

Heisenberg's Indeterminacy Equation Clarification [ENDORSED]

Hi everyone. I was wondering if someone can please clarify which symbol of the equation (Delta P)( Delta X) is greater or equal to h/(4pi") represents uncertainty in position and uncertainty in momentum. The course reader states that (Delta P) represents uncertainty in momentum and (Delta X) re...
by Mirna_Velasco_1L
Thu Sep 29, 2016 6:27 pm
Forum: SI Units, Unit Conversions
Topic: Review Principal L39
Replies: 1
Views: 375

Review Principal L39

Hi everyone, I am hoping to see if anyone can please explain to me how do we use the ratio (1:2) and the empirical formula (SnO2) we solved for in part A of the problem to name the oxide (part B). The solution manual states the answer to be Tin(IV)oxide). I remember my TA saying something about the ...

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