## Search found 60 matches

Sun Mar 17, 2019 4:26 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate of consumption
Replies: 3
Views: 373

### Re: Rate of consumption

It would be different only by stoichiometry
Sun Mar 17, 2019 4:25 pm
Forum: First Order Reactions
Topic: Slopes of a plot
Replies: 7
Views: 779

### Re: Slopes of a plot

yes it is
Sun Mar 17, 2019 4:24 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Plot of Arrhenius function
Replies: 4
Views: 517

### Re: Plot of Arrhenius function

The y axis is lnk
Sun Mar 03, 2019 3:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: standard cell potential
Replies: 2
Views: 155

### Re: standard cell potential

The oxidation reaction is simply the reverse of the reduction reaction, so its potential is the flipped reduction potential.
Sun Mar 03, 2019 3:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: H+, OH-, water
Replies: 9
Views: 419

### Re: H+, OH-, water

Water is implied in the aqueous species of your cell diagram, so you do not need to externally include them. However, the presence of H+ and OH- needs to be specified by including them in your cell diagram.
Sun Mar 03, 2019 3:53 pm
Forum: Balancing Redox Reactions
Topic: oxidation states
Replies: 4
Views: 220

### Re: oxidation states

Oxidation states refer to the number of electrons an element wants to gain or lose so to reach a neutral state.
Sun Mar 03, 2019 3:49 pm
Forum: Balancing Redox Reactions
Topic: Creating a cell diagram
Replies: 8
Views: 385

### Re: Creating a cell diagram

H20 is implied when you have aqueous solutions, so you do not need to include it in the cell diagram. However, you would need to include H+
Sun Mar 03, 2019 3:48 pm
Forum: Van't Hoff Equation
Topic: units of T
Replies: 5
Views: 472

### Re: units of T

The only case where T does not necessarily have to be in kelvins is when you are calculating delta T. In that case, celcius would also work.
Sun Mar 03, 2019 3:46 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: w vs wmax
Replies: 5
Views: 231

### Re: w vs wmax

Max work assumes that all change in energy (delta G) is translated to work
Sun Mar 03, 2019 3:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell with all-solid species
Replies: 1
Views: 104

### Cell with all-solid species

I am having trouble visualizing a cell that only has solid-state species as well as a solid conductor. How would such a cell operate?
Sun Mar 03, 2019 3:39 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Standard G
Replies: 4
Views: 198

### Standard G

How do we know, based on a question, whether we should use standard G or just G
Sun Mar 03, 2019 3:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gr vs G
Replies: 1
Views: 166

### Gr vs G

When do we know when to use the molar representation of G instead of the parameter representation of G (Gr)? The textbook states that the n value within G can either be considered the number of moles or be taken as a constant, thus changing the units that G is expressed in.
Sun Feb 10, 2019 7:35 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4.19 7th edition
Replies: 1
Views: 124

### Re: 4.19 7th edition

We did go over thus in class. The equation relies on the fact that the internal energy of gases depends on temperature and the fact that there are three translational directions by which the molecule can move.
Sun Feb 10, 2019 7:30 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorometric Heat Capacity
Replies: 1
Views: 133

### Calorometric Heat Capacity

Would we ever need the mass of the calorimeter to find its specific heat in any question?
Mon Feb 04, 2019 11:58 pm
Forum: Calculating Work of Expansion
Topic: q and delta H
Replies: 3
Views: 179

### q and delta H

Under what conditions is q the same as delta H?
Mon Feb 04, 2019 11:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Reversible vs Irreversible
Replies: 2
Views: 168

### Re: Reversible vs Irreversible

Reversible expansion is change in pressure performed very very slowly, so the work done is done in small increments. Therefore, the total work done would be the sum of all the small increments, resulting in more work done than if the change in pressure were to happen all at once (irreversible expans...
Mon Feb 04, 2019 11:53 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant numbers
Replies: 4
Views: 250

### Re: Constant numbers

The ideal gas constant and the heat capacity for water, as well as the conversion factor between atmospheres and joules are the constants that we should know. However, everything is provided for us are on the constants and equations, so no memorization is needed.
Sun Jan 20, 2019 10:16 am
Forum: Ideal Gases
Topic: ice
Replies: 4
Views: 282

### Re: ice

There is no difference. Ka and K are both descriptions of equilibrium -- they have no fundamental difference. Ka is just a more specified name
Sun Jan 20, 2019 10:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constant in different temperatures
Replies: 3
Views: 111

### Re: Equilibrium constant in different temperatures

Adding onto what Noah said, the changed equilibrium concnetrations of the products and reactants is what leads to a different equilibrium constant
Sun Jan 20, 2019 10:12 am
Forum: Identifying Acidic & Basic Salts
Topic: cations and anions that can be ignored
Replies: 2
Views: 297

### Re: cations and anions that can be ignored

The nitrate, perchlorate and sulfate ions are also spectator ions
Sat Jan 12, 2019 5:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Values of K
Replies: 2
Views: 111

### Re: Values of K

When neither the products nor reactants are favored at equilibrium, that means that at equilibrium, the ratio of reactants to products is closer to 1:1
Sat Jan 12, 2019 5:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why no units for K?
Replies: 3
Views: 196

### Re: Why no units for K?

K has no units because when elaborated, the units cancel out. The k equation we use is technically an abbreviation.
Sat Jan 12, 2019 5:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 2
Views: 121

### Re: ICE tables

That would depend on what information you are using to find your concentration. If you are using a given k and the equilibrium concentrations of all the other reactants and products, then the coefficient would be in the exponent. If you are using an ice table, then the coefficient would be multiplie...
Sat Dec 08, 2018 8:54 pm
Forum: Air Pollution & Acid Rain
Topic: Blood pH
Replies: 2
Views: 370

### Blood pH

In our notes, it says that we should be familiar with the role fo of CO2, H2CO3 and HCO3- in maintaining blood at pH 7.4. However, this is chapter 13 material on buffers. How much of this topic should we know for the final?
Thu Dec 06, 2018 9:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Blood pH
Replies: 1
Views: 131

### Blood pH

In lecture, we were told to "see textbook for the role that CO2, H2CO3, HCO3- play in maintaining blood at pH 7.4." When I consulted the textbook, blood pH was only discussed in the buffers chapter (ch 13). I am wondering if we will be tested on this on the final.
Thu Dec 06, 2018 7:32 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Relative Acidity
Replies: 1
Views: 139

### Relative Acidity

The textbook states that with greater electronegativity on the central atom, the higher the acidity of the compound. Yet it also states that the greater the atomic size of the central atom, the greater the acidity. Because electronegativity goes up going up a group, and radius goes up going down a g...
Wed Dec 05, 2018 11:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Sig Figs for pH
Replies: 3
Views: 206

### Sig Figs for pH

How do sig figs apply to pH calculations?
Mon Dec 03, 2018 10:06 pm
Forum: Conjugate Acids & Bases
Topic: Neutral Ligands
Replies: 1
Views: 155

### Re: Neutral Ligands

Drawing the lewis structures and finding the overall formal charge of the ion will always allow us to deduce the charge
Mon Dec 03, 2018 10:05 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bond with Hybridization
Replies: 2
Views: 393

### Re: Sigma and Pi Bond with Hybridization

A single bond consists of a single sigma bond. A double bond consists of a sigma bond and a pi bond. A triple bond consists of a sigma bond and 2 pi bonds.
Mon Dec 03, 2018 10:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 113

### Polydentate

The definition of a bidentate ligand is that it has "2 bonding sites" -- is this referring to 2 bonding sites on the ligand, or that the ligand binds to 2 sites on the same cation?
Mon Nov 26, 2018 9:47 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability vs Polaring Power
Replies: 2
Views: 190

### Re: Polarizability vs Polaring Power

Polarizing power is the ability to polarize another atom. So cations have high polarizing power because they have higher electrostatic pulls to neighbouring from their positive charge, and anions are highly polarizable since they have an abundance of electrons.
Mon Nov 26, 2018 9:45 pm
Forum: Lewis Structures
Topic: HW #3.67b (6th Ed)
Replies: 2
Views: 150

### Re: HW #3.67b (6th Ed)

I agree with you. Double bonds would lower the formal charge
Mon Nov 26, 2018 9:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Non-polar
Replies: 1
Views: 127

### Re: Polar and Non-polar

The name of the compound would indicate if it were cis or trans, and using the VSEPR model to find the molecule configuration would allow us to determine polarity
Sat Nov 24, 2018 5:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Single vs Double bond electron diffusity
Replies: 2
Views: 107

### Single vs Double bond electron diffusity

Do higher order bonds take up more space than a single bond since there are more electrons in that electron density?
Mon Nov 19, 2018 6:50 pm
Forum: Hybridization
Topic: D-orbital
Replies: 5
Views: 237

### Re: D-orbital

Either is correct.
Mon Nov 19, 2018 6:48 pm
Forum: Hybridization
Topic: Relation to Bond Angles
Replies: 3
Views: 91

### Re: Relation to Bond Angles

Even though certain atomic orbitals would support the observed number of bonds in a molecule, they don’t always support the observed bond angles. For instance, in nh3, there are three unpaired electrons in nitrogen’s atomic orbitals that correctly support the three h bonds; however, these three bond...
Mon Nov 19, 2018 6:43 pm
Forum: Bond Lengths & Energies
Topic: double bonds vs. single bonds
Replies: 5
Views: 314

### Re: double bonds vs. single bonds

Because double bonds include a pi bond that prevents rotation, they are more stable.
Thu Nov 08, 2018 11:10 pm
Forum: Dipole Moments
Topic: dipole interaction
Replies: 2
Views: 124

### Re: dipole interaction

Because electrons are not static and do not follow a specific course, their distribution is constantly changing. By chance, this fluctuation may result in the electrons being more concentrated on one side of the atom, causing a temporary dipole; this is how London dispersion forces arise. Regular di...
Thu Nov 08, 2018 10:59 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of Bonds?
Replies: 5
Views: 331

### Re: Strength of Bonds?

To answer your second question, no covalent bond is 100% covalent -- they all have some ionic character. Thus the determining factors of ionic bond strength all apply to covalent bonds as well, including electronegativity and thus polarizing power.
Thu Nov 08, 2018 10:56 pm
Forum: Dipole Moments
Topic: Dipole - Dipole vs. Hydrogen Bonding
Replies: 7
Views: 736

### Re: Dipole - Dipole vs. Hydrogen Bonding

Hydrogen bonds are a special type of dipole-dipole bonds where hydrogen is bonded to O, N, or F. These are three very electronegative atoms, so they have greater polarizing power, and thus a stronger dipole and a stronger bond than other dipole-dipole bonds.
Mon Oct 29, 2018 11:06 pm
Forum: Trends in The Periodic Table
Topic: 2.67 Ed 6, electron afinity
Replies: 2
Views: 180

### 2.67 Ed 6, electron afinity

In question 2.67 for the 6th edition textbook, it states that C has a higher electron affinity than N even though N is further right on the periodic table. Why is that?
Mon Oct 29, 2018 11:05 pm
Forum: Trends in The Periodic Table
Topic: Diagonal Relationships only apply for isoelectronic atoms?
Replies: 1
Views: 122

### Diagonal Relationships only apply for isoelectronic atoms?

Do diagonal relationships only apply for isoelectronic atoms?
Mon Oct 29, 2018 11:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cerium Electron Configuration
Replies: 1
Views: 57

### Cerium Electron Configuration

In the textbook, it wrote the electron configuration of Cerium as [XE] 4f1 5d1 6s2. Why is it 4f1 if Cerium is the second element in the f-block row?
Mon Oct 29, 2018 11:02 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Why is it 4f14 if there are 15 elements in that row
Replies: 2
Views: 322

### Why is it 4f14 if there are 15 elements in that row

Why is a full f orbital 4f14 when there are 15 elements in that row (lanthanum to lutetium)?
Sun Oct 28, 2018 11:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 3
Views: 174

### Re: Orbitals

The only rule regarding Ms is that it can take on values of either +0.5 or -0.5 (spin up or spin down). It does not depend of any of the previous quantum numbers.
Sun Oct 28, 2018 11:15 pm
Forum: Ionic & Covalent Bonds
Topic: Roman numerals next to element
Replies: 8
Views: 2719

### Re: Roman numerals next to element

The roman numerals specify the atom's ionic form for the atoms that can gain/lose differing number of electrons.
Sun Oct 28, 2018 11:12 pm
Forum: Properties of Electrons
Topic: Schrodinger question
Replies: 3
Views: 2389

### Re: Schrodinger question

The Schrodinger equation is used to derive the quantum numbers, which elucidate the shapes of the atoms. For instance, the square of the wave function that comes from the Schrodinger equation tells us the probability density of the elections, which informs us on the shape of the atomic orbitals.
Tue Oct 23, 2018 11:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Units within calculations
Replies: 1
Views: 137

### Units within calculations

Hello, I am wondering if we are required to include the units in every term of within our calculations, or if simply writing the units of our final answer is enough. For instance, if we were calculating frequency, would we have to write v=(3x10^8m/s)/(4x10^-12m)?
Sat Oct 20, 2018 6:15 pm
Forum: Properties of Light
Topic: Photoelectric Effect result
Replies: 2
Views: 201

### Re: Photoelectric Effect result

For a metal to eject electrons, the ENERGY of the incoming radiation must match or exceeds the required energy to eject the election. Because E=hv and v is inversely proportional to wavelength (c=wavelength x v), that means that the wavelength of the incoming radiation, rather than the intensity, de...
Fri Oct 19, 2018 12:18 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines vs. Diffraction Pattern
Replies: 1
Views: 56

### Spectral Lines vs. Diffraction Pattern

What is the difference between spectral lines and a diffraction pattern in terms of waves and aborption? Also what is the difference between absorption and emission spectra?
Fri Oct 19, 2018 12:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: (6 Ed) Ch.1 #13
Replies: 2
Views: 151

### Re: (6 Ed) Ch.1 #13

The series can be identified as follows: If the electron is making a transition from a higher energy level to n=2, then it is Balmer Series. If the electron is making a transition from a higher energy level to n=1, then it is Lyman Series. To find what color is emitted, we can first use the Bohr for...
Fri Oct 19, 2018 11:54 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-Atom and multi-electron atoms
Replies: 3
Views: 147

### Re: H-Atom and multi-electron atoms

When we have multi-electon atoms, the shielding effect and the different electrostatic energies that result when you have different numbers of protons impact the performance of the electrons.
Fri Oct 19, 2018 11:42 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Module #41
Replies: 3
Views: 154

### Re: Atomic Spectra Module #41

The answer is B because the energy difference from n=5 to n=1 is greater than the difference from n=4 to n=2. Because E=hv and h is a constant, then the greater energy difference can be reflected only in a difference in frequency, meaning that the released energy when passing from n=5 to n=1 would h...
Thu Oct 11, 2018 5:52 pm
Forum: Administrative Questions and Class Announcements
Topic: AAP PLF Sessions, Can't Enroll
Replies: 1
Views: 119

### AAP PLF Sessions, Can't Enroll

Hi, I am trying to enroll in the APP PLF Sessions; however, when I go to the Peer Learning page on myUCLA, it says that I have "no upcoming peer learning passes". How should I proceed?
Thu Oct 11, 2018 5:42 pm
Forum: Photoelectric Effect
Topic: Work function
Replies: 7
Views: 260

### Re: Work function

Energy of photon + Energy to remove election = Kinetic energy of ejected election
hv-(circle with a slash, which is the work function or threshold energy) = 0.5mv^2
Thu Oct 11, 2018 5:37 pm
Forum: Balancing Chemical Reactions
Topic: How To....
Replies: 16
Views: 2001

### Re: How To....

Today during our test, our TA told us that states are not required for our reactons
Tue Oct 09, 2018 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: 7 Questions Handin Date
Replies: 2
Views: 182

### 7 Questions Handin Date

Hello, I am wondering if we are still handing in our 7 homework questions on Friday, or if we are now handing them in during our discussions. Thanks!
Tue Oct 02, 2018 11:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units when calculating volume
Replies: 4
Views: 961

### Re: Units when calculating volume

When we are calculating volume we use the equation M1V1=M2V2, where M=mol/L and we are given both M1 and M2 as well as one of the Vs. Because we are using mol/L in our calculations, we must remain uniform and keep all our calculations in L.
Tue Oct 02, 2018 10:15 pm
Forum: Empirical & Molecular Formulas
Topic: Resources given on tests [ENDORSED]
Replies: 3
Views: 278

### Resources given on tests[ENDORSED]

Hi I'm wondering what resources we are allowed to reference during our tests. If we will be given a periodic table, I would love to know which one it is so I can familiarize myself with it, as with any other resource we will be given.
Fri Sep 28, 2018 4:52 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Office Hours [ENDORSED]
Replies: 3
Views: 152

### UA Office Hours[ENDORSED]

Does anyone know when the UAs host their office hours or where I could find that information? Thanks!

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