Search found 53 matches

by Gabriela Carrillo 1B
Sat Mar 17, 2018 9:01 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre equilibrium
Replies: 5
Views: 346

Pre equilibrium

For pre equilibrium problems, is it okay to leave K1 as k1/k1' in the overall reaction rate?
by Gabriela Carrillo 1B
Sat Mar 17, 2018 9:00 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: internal energy
Replies: 2
Views: 236

internal energy

If a system is said to go back to its original internal energy do we flip the sign of the internal energy?
by Gabriela Carrillo 1B
Sat Mar 17, 2018 8:49 pm
Forum: Calculating Work of Expansion
Topic: Pressure [ENDORSED]
Replies: 1
Views: 179

Pressure [ENDORSED]

If a problem states that a system is undergoing an expansion against an external pressure of x atm does that mean we use the w= - P(delta)V equation?
by Gabriela Carrillo 1B
Sun Mar 11, 2018 10:13 pm
Forum: Zero Order Reactions
Topic: Chart problems [ENDORSED]
Replies: 3
Views: 270

Chart problems [ENDORSED]

If we figure out that a reactant is of zero order, can we ignore it when comparing concentrations to figure out the orders of the other reactants?
by Gabriela Carrillo 1B
Sun Mar 11, 2018 10:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Given information
Replies: 5
Views: 217

Given information

Will we be told which rxn is the slow and which is the fast? Also will we be given the intermediate molecule?
by Gabriela Carrillo 1B
Sun Mar 11, 2018 10:11 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: K and K'
Replies: 4
Views: 160

K and K'

Is the relationship between k and k': k=1/k' ?
by Gabriela Carrillo 1B
Sun Mar 04, 2018 11:15 pm
Forum: General Rate Laws
Topic: zero order in rate laws
Replies: 8
Views: 276

zero order in rate laws

If a reactant is zero order do we include it in the rate law or write it without it? For example: rate=k[A][B]^2[C]^0 or rate=k[A][B]^2?
by Gabriela Carrillo 1B
Sun Mar 04, 2018 11:10 pm
Forum: First Order Reactions
Topic: 15.23 c
Replies: 2
Views: 154

15.23 c

If given the molarity of how much product was formed, how would you use dimensional analysis to figure out [A]?
by Gabriela Carrillo 1B
Sun Mar 04, 2018 11:08 pm
Forum: First Order Reactions
Topic: First order
Replies: 4
Views: 200

First order

When given a chart, would we identify a reactant as being first order if when its molarity is doubled the rate is doubled?
by Gabriela Carrillo 1B
Thu Feb 22, 2018 3:13 pm
Forum: Balancing Redox Reactions
Topic: Oxidation
Replies: 3
Views: 151

Oxidation

How do we figure out the oxidation state of a product in a redox reaction?
by Gabriela Carrillo 1B
Thu Feb 22, 2018 3:05 pm
Forum: General Rate Laws
Topic: 15.17
Replies: 1
Views: 125

15.17

Is the overall order of a reaction the addition of the orders of each reactant?
by Gabriela Carrillo 1B
Thu Feb 22, 2018 3:04 pm
Forum: First Order Reactions
Topic: 15.15
Replies: 4
Views: 164

15.15

Is the concentration of CH3Br raised to the power of 1.2 in the rate law for the reaction? What does 1.2 imply?
by Gabriela Carrillo 1B
Sun Feb 18, 2018 9:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cell
Replies: 3
Views: 147

Galvanic Cell

For a Galvanic cell, is putting salt bridge as a label enough or do we have to indicate where the NaCl is going?
by Gabriela Carrillo 1B
Sun Feb 18, 2018 9:18 pm
Forum: Balancing Redox Reactions
Topic: Basic v Acidic
Replies: 2
Views: 108

Basic v Acidic

Unless told so, how are we supposed to know whether to add OH- or H2O? How do we tell if the reaction is acidic or basic?
by Gabriela Carrillo 1B
Sat Feb 17, 2018 11:19 am
Forum: Balancing Redox Reactions
Topic: 9.3b
Replies: 1
Views: 67

9.3b

After balancing the half reactions I had 5 electrons for the reduction and 2 for the oxidation. Is the only way to balance these by multiplying by their LCM??
by Gabriela Carrillo 1B
Sun Feb 11, 2018 11:04 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Monoatomic Ideal Gases
Replies: 1
Views: 79

Re: Monoatomic Ideal Gases

Cv corresponds to constant volume so you would use (3/2)
by Gabriela Carrillo 1B
Sun Feb 11, 2018 3:26 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.53
Replies: 2
Views: 92

8.53

Why is m dropped in the equation q=mc(delta)T and why is q negative in this calculation?
by Gabriela Carrillo 1B
Sun Feb 11, 2018 2:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.49
Replies: 3
Views: 147

8.49

In the solution manual, why are delta H and q shown to be the same when solving for internal energy?
by Gabriela Carrillo 1B
Fri Feb 02, 2018 10:24 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.75
Replies: 1
Views: 87

9.75

Would a trans isomer have the same entropy as its corresponding cis octahedral crystal because they are composed of the same molecules? Or when calculating W can its position only be changed with the limitations of staying in a trans or cis formation?
by Gabriela Carrillo 1B
Fri Feb 02, 2018 10:22 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.73
Replies: 1
Views: 72

9.73

Do the signs of delta S, G, H signal the spontaneity of a reaction only under standard conditions?
by Gabriela Carrillo 1B
Fri Feb 02, 2018 10:17 am
Forum: Balancing Redox Reactions
Topic: Solids [ENDORSED]
Replies: 2
Views: 197

Solids [ENDORSED]

When a solid cathode and anode aren't present we are allowed to put Pt(s) or Carbon (gr). Do we have to choose one element for both the oxidation and reduction or can the cathode be Pt and anode be C??
by Gabriela Carrillo 1B
Sun Jan 28, 2018 10:13 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 3
Views: 133

9.13

Where did 1 mol come from? It is not stated in the question, when it is said to assume ideal behavior and we are not given moles does that mean we assume it is 1 mol??
by Gabriela Carrillo 1B
Sun Jan 28, 2018 10:12 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13 [ENDORSED]
Replies: 1
Views: 93

9.13 [ENDORSED]

Why is the equation change in S= nRln(T2/T1) used instead of S= nCln(T2/T1)? Shouldn't R be multiplied by either 5/2 or 3/2?
by Gabriela Carrillo 1B
Sun Jan 28, 2018 10:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.3
Replies: 5
Views: 200

9.3

Why is energy negative in the first calculation of entropy (-40000J/800K) and positive in the second (40000J/200K)?
by Gabriela Carrillo 1B
Sun Jan 21, 2018 6:39 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.41
Replies: 1
Views: 83

8.41

Why can't you set (400g)(4.184 J/Cg)(T-45) equal to (50g)(4.184 J/Cg)(T-0)? Why do we set it equal to the change in state instead?
by Gabriela Carrillo 1B
Sun Jan 21, 2018 6:02 pm
Forum: Phase Changes & Related Calculations
Topic: 8.39
Replies: 1
Views: 100

8.39

For this problem, because the ice starts at 0 degrees Celsius the step accounting for the solid approaching its melting point isn't necessary correct? You can just start with the phase change calculation?
by Gabriela Carrillo 1B
Sun Jan 21, 2018 4:26 pm
Forum: Phase Changes & Related Calculations
Topic: 8.9
Replies: 2
Views: 124

8.9

When calculating w, I understand how to calculate -1.48 L atm but how do we convert that to Joules to use in the equation to calculate the change in internal energy?
by Gabriela Carrillo 1B
Mon Jan 15, 2018 10:15 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Determining sign of q
Replies: 2
Views: 104

Re: Determining sign of q

It depends on whether the system releases or absorbs the J of heat
by Gabriela Carrillo 1B
Mon Jan 15, 2018 10:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.45
Replies: 2
Views: 119

8.45

For part a, why are we allowed to ignore the 4 moles of C when calculating the heat absorbed in the reaction of 1.25 moles of S8?
by Gabriela Carrillo 1B
Mon Jan 15, 2018 10:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.77
Replies: 2
Views: 108

8.77

I understand the calculations behind the two options (resonance vs. 3 single and 3 double bonds) but I am unsure why the resonance bond is more stable?
by Gabriela Carrillo 1B
Mon Jan 15, 2018 10:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess Law
Replies: 4
Views: 181

Hess Law

When manipulating reactions using Hess's Law I know you can multiply the rxn and deltaH by the coefficient needed to become equivalent to the desired rxn. Can you also divide both to obtain the desired rxn??
by Gabriela Carrillo 1B
Thu Dec 07, 2017 10:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Different Shapes
Replies: 4
Views: 347

Re: Different Shapes

T-shaped:AX3E2
Seesaw:AX4E1
Square pyramidal:AX5E1
by Gabriela Carrillo 1B
Thu Dec 07, 2017 9:57 pm
Forum: Lewis Acids & Bases
Topic: Knowing products formed [ENDORSED]
Replies: 1
Views: 143

Knowing products formed [ENDORSED]

Are we expected to know the reaction when only given an acid or base reactant?? If its an acid, I understand that it will form H3O+ and if a base, OH- , but how are we supposed to know the other product formed?? and will water always be the other reactant present?
by Gabriela Carrillo 1B
Fri Dec 01, 2017 12:43 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Theory
Replies: 4
Views: 229

Molecular Orbital Theory

Are we supposed to know this concept for the final? It wasn't covered in class and was not a homework problem, however I've seen it covered in other resources for this class.
by Gabriela Carrillo 1B
Tue Nov 28, 2017 4:15 pm
Forum: Naming
Topic: Oxidation
Replies: 1
Views: 105

Oxidation

When asked for the oxidation state of the metal atom do we use the changed name or leave it as is for a negative compound? For example: would we say Iron (II) or Ferrate (II) for [Fe(CN)6]^4-
by Gabriela Carrillo 1B
Tue Nov 21, 2017 12:23 pm
Forum: Hybridization
Topic: 4.73
Replies: 2
Views: 147

4.73

Why are the molecules CH2 and CH2 ^ 2+ not radicals? Does the fact that carbon has an incomplete octet not qualify it to be a radical??
by Gabriela Carrillo 1B
Tue Nov 21, 2017 12:20 pm
Forum: Hybridization
Topic: 4.31
Replies: 2
Views: 131

4.31

How exactly are we supposed to figure out the relative orientations of the hybrid orbitals?? Is it based off the central atom? If its tetrahedral then the atom is connected to 4 things and therefore is sp3??
by Gabriela Carrillo 1B
Thu Nov 16, 2017 10:50 pm
Forum: Hybridization
Topic: Hybridization in Carbon
Replies: 3
Views: 141

Hybridization in Carbon

Why is the hybridization of a Carbon atom with two single bonds and one double bond sp^2?? I would've expected it to be sp^3 because isn't it still making 4 bonds?? Or since the double bond is one area of electron density it counts as one bond??
by Gabriela Carrillo 1B
Thu Nov 16, 2017 10:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle answers
Replies: 2
Views: 134

Bond Angle answers

When tested and asked for the bond angle, are we expected to be very specific? For example, if the shape is trigonal pyramidal and we say the bond angle is 109.5 degrees instead of slightly less than 109.5 degrees, will we loose points??
by Gabriela Carrillo 1B
Wed Nov 08, 2017 10:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: delta v
Replies: 4
Views: 269

delta v

When solving a problem related to the Heisenberg indeterminacy equation and given the velocity as 4.65 x 10^6 +/-1.64 x 10^6 is it correct that I would plug in (2 x (1.64x10^6)) as my delta v?
by Gabriela Carrillo 1B
Wed Nov 08, 2017 9:52 pm
Forum: Ionic & Covalent Bonds
Topic: Polar vs. Non-polar
Replies: 7
Views: 360

Polar vs. Non-polar

If asked to identify if a bond is polar or non-polar, would we be given the distance between the two atoms in order to calculate the electric dipole moment??
by Gabriela Carrillo 1B
Thu Nov 02, 2017 8:56 pm
Forum: Lewis Structures
Topic: 3.61
Replies: 2
Views: 200

3.59

In part a) ClO, I calculated the total valence e-s (13) and used a single bond, but how do we know to put the unpaired electron on chlorine and not oxygen??
by Gabriela Carrillo 1B
Thu Nov 02, 2017 8:40 pm
Forum: Lewis Structures
Topic: 3.59
Replies: 3
Views: 219

3.41

For part c) H2C(NH2)COOH, the first step I did was to calculate the total number of valence electrons (30e-s). I understand after looking at the solutions manual that each atom has a full octet (or for hydrogen a full shell), but I don't understand the thought process behind connecting and centering...
by Gabriela Carrillo 1B
Thu Oct 26, 2017 9:55 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.19 Part B
Replies: 5
Views: 288

2.43 part e

What is the ground sate electron configuration for (e) tungsten?? I understand that you start with [Xe] but I'm lost on how the 4f^14 5d^4 6s^2 was attained First of all will d-block n value always be one less than that of s block??? Secondly, do we plug in the f-block to the periodic table to get t...
by Gabriela Carrillo 1B
Thu Oct 26, 2017 9:48 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs. Covalent Bonds [ENDORSED]
Replies: 8
Views: 435

Re: Ionic vs. Covalent Bonds [ENDORSED]

In relation to covalent and ionic bonds are Lewis diagrams only applicable to covalent bonds???
by Gabriela Carrillo 1B
Thu Oct 19, 2017 10:45 pm
Forum: Properties of Electrons
Topic: Atomic Spectra and Energy Levels
Replies: 3
Views: 227

1.69

I understand that in order to figure out which laser should be used we must calculate the energies and compare that to the work function of lithium, but I don't understand where the numbers being used to calculate the work function are coming from. Where did (2.93 eV) and (1.60218x10^-19 JeV^-1) com...
by Gabriela Carrillo 1B
Thu Oct 19, 2017 10:40 pm
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 3
Views: 188

Re: Schrodinger Equation

So this is a topic we should understand conceptually but isn't something we will be asked a mathematical question on??
by Gabriela Carrillo 1B
Tue Oct 17, 2017 11:04 pm
Forum: Properties of Light
Topic: Oscillation of Light
Replies: 3
Views: 185

Modules

Is the module "Chemical Equilibrium Part 1" part of this week's lectures??
by Gabriela Carrillo 1B
Thu Oct 12, 2017 11:03 pm
Forum: Properties of Light
Topic: 1.15
Replies: 4
Views: 206

Re: 1.15

I also had a question on this problem, in the solutions manual it plugs in 1 for the value of n1. Should we assume that the initial energy level is always 1? Or is this specifically for hydrogen??
by Gabriela Carrillo 1B
Thu Oct 12, 2017 7:32 pm
Forum: Properties of Electrons
Topic: Rydberg's Equation [ENDORSED]
Replies: 3
Views: 219

Rydberg's Equation [ENDORSED]

In one of the modules the professor writes the equation as v=-hR/n^2 but when I came across the equation expressed as V=R[(1/n^2) + (1/n^2)] the negative sign is gone so I'm just wondering whether or not the equation should or should not have a negative sign??
by Gabriela Carrillo 1B
Thu Oct 12, 2017 7:10 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorization of frequencies for test [ENDORSED]
Replies: 2
Views: 159

Re: Memorization of frequencies for test [ENDORSED]

I went to a UAs office hours today and was told that we will most likely be given the ranges if asked to identify the type of EM wave but should know the spectrum of visible light.
by Gabriela Carrillo 1B
Thu Oct 05, 2017 9:29 pm
Forum: Limiting Reactant Calculations
Topic: M. 15 Fundamentals
Replies: 4
Views: 295

Limiting Reactant

After figuring out the limiting reactant, how do I calculate how much product is produced and how much excess is produced? Do I multiply the amount of moles available of the limiting reactant by the ratio of moles in the equation???
by Gabriela Carrillo 1B
Wed Oct 04, 2017 9:42 pm
Forum: SI Units, Unit Conversions
Topic: Limiting Reagents [ENDORSED]
Replies: 8
Views: 549

Re: Limiting Reagents [ENDORSED]

For problem M.9 what's the process to figuring out how to write the net ionic equation for the reaction? Also will we need to know how to do that by the quiz this friday?

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