Search found 62 matches

by Aiden Metzner 2C
Sun Jan 19, 2020 7:39 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: reactants and products in dynamic equilibria
Replies: 3
Views: 10

Re: reactants and products in dynamic equilibria

Because certain molecules are more stable then others so those are favored in reactions over unstable molecules.
by Aiden Metzner 2C
Sun Jan 19, 2020 7:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pa and Pb
Replies: 4
Views: 16

Pa and Pb

How do you no whether to use Pa or Pb in an acid base calculation?
by Aiden Metzner 2C
Sun Jan 19, 2020 7:37 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: exothermic/endothermic rxns
Replies: 4
Views: 11

Re: exothermic/endothermic rxns

Because more energy is provided to the system so in an endothermic reaction that requires heat to make products, it is easier for the reactants to become products if they are provided with heat, and vise versa for exothermic reactions
by Aiden Metzner 2C
Sun Jan 19, 2020 7:36 pm
Forum: Ideal Gases
Topic: When does the Ideal Gas Law Fail?
Replies: 3
Views: 7

Re: When does the Ideal Gas Law Fail?

It fails at low temperatures and higher pressures because intermolecular forces become important, it also fails with heavy gases.
by Aiden Metzner 2C
Sun Jan 19, 2020 7:34 pm
Forum: Ideal Gases
Topic: Step Up Session Material
Replies: 2
Views: 5

Re: Step Up Session Material

The one that I have been to worked out of the book as I came and asked about specific problems in the textbook.
by Aiden Metzner 2C
Sun Jan 12, 2020 3:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 3
Views: 15

ICE tables

Do you always have to use ice tables when determining equilibrium concentrations, or is it possible to do calculations without the ice tables?
by Aiden Metzner 2C
Sun Jan 12, 2020 3:52 pm
Forum: Ideal Gases
Topic: Test 1
Replies: 7
Views: 46

Re: Test 1

He said in his outlines you have to be able to calculate a certain variable of pv=nrt given all four of the others. So just simple algebraic calculations I think.
by Aiden Metzner 2C
Sun Jan 12, 2020 3:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Rounding in K problems
Replies: 4
Views: 19

Re: Rounding in K problems

You aren't supposed to round until the end, the answer will be the most accurate if the exact numbers are used until the final answer.
by Aiden Metzner 2C
Sun Jan 12, 2020 3:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Test 1
Replies: 6
Views: 25

Test 1

Is test 1 this week like it was in 14A or do we have more time before this test.
by Aiden Metzner 2C
Sun Jan 12, 2020 3:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use Kc vs Kp
Replies: 7
Views: 24

Re: When to use Kc vs Kp

We use Kp when calculating partial pressure of gases and Kc when calculating concentration of aqueous solutions.
by Aiden Metzner 2C
Fri Dec 06, 2019 3:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Deciding shape
Replies: 3
Views: 29

Re: Deciding shape

If you determine the coordination number you can determine how many molecules bond to it, if you find this out you can find the molecular shape.
by Aiden Metzner 2C
Fri Dec 06, 2019 3:27 pm
Forum: Sigma & Pi Bonds
Topic: Change in hybridization based on sigma and pi bonds
Replies: 1
Views: 24

Change in hybridization based on sigma and pi bonds

Does hybridization of orbitals change depending on if the bonds are sigma or pi?
by Aiden Metzner 2C
Fri Dec 06, 2019 3:26 pm
Forum: Lewis Structures
Topic: Oxoacids
Replies: 1
Views: 22

Re: Oxoacids

I don't think so, just remember that if it is an acid with a center molecule with oxygens and hydrogens around it. The oxygens bond to the center molecule and the hydrogens bond to the oxygens.
by Aiden Metzner 2C
Fri Dec 06, 2019 3:11 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: speed of light
Replies: 2
Views: 26

Re: speed of light

Electrons are never found in the nucleus even if the uncertainty in velocity is less than the speed of light. That being said I don't think there is a case where this is ever possible because heisenbergs uncertainty principle would likely always show that an electrons velocity uncertainty is more th...
by Aiden Metzner 2C
Fri Dec 06, 2019 3:06 pm
Forum: Hybridization
Topic: Hybridization - 2F9 part d
Replies: 1
Views: 16

Re: Hybridization - 2F9 part d

I find it more helpful to look at the lewis structure and not the electron configuration when looking at hybridization. Use the regions of electron density to figure out what the hybridization is. PCL3 is sp^3 because it has 4 regions of electron density because it has three bonds and one lone pair....
by Aiden Metzner 2C
Fri Dec 06, 2019 3:03 pm
Forum: Hybridization
Topic: hybridization of lone pairs
Replies: 4
Views: 25

Re: hybridization of lone pairs

Yes, hybridization is solely based on regions of electron density. An atom with two bonds and one lone pair would have the same hybridization (sp^2) as something with three bonds and no lone pair.
by Aiden Metzner 2C
Sun Dec 01, 2019 5:14 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Inductive Effect
Replies: 1
Views: 13

Re: Inductive Effect

The inductive effect is when conjugate acids and bases are stabilized by a strong electronegative atom. These atoms pull the electrons in more which makes them more stable in solution.
by Aiden Metzner 2C
Sun Dec 01, 2019 5:10 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Test Grades
Replies: 6
Views: 47

Test Grades

Is anyone elses test grade in myUCLA for test 2 a zero? I'm a little concerned as I never got my test back and am still not seeing a grade in myUCLA.
by Aiden Metzner 2C
Sun Dec 01, 2019 5:09 pm
Forum: Lewis Acids & Bases
Topic: strong and weak acids
Replies: 3
Views: 20

Re: strong and weak acids

An acid or base is strong if they completely disassociate in solution. I'm pretty sure for the final we just need to know a few strong acids and a few strong bases, the bases being, KOH, NaOH, Ba(OH)2, Cs(OH), Sr(OH)2, Ca(OH)2, Li(OH), and Rb(OH) these are all group one and two elements with OH on t...
by Aiden Metzner 2C
Sun Dec 01, 2019 5:04 pm
Forum: Naming
Topic: Naming for the final
Replies: 6
Views: 54

Re: Naming for the final

Some of the general rules for naming are as follows. Use the prefixes di, tri, tetra, penta, hexa, octa, if there are two or more of certain molecules. For ligands, name them in alphabetical order remembering to replace ammonia with ammine, or anything ending in ide with an o. Also cations go first ...
by Aiden Metzner 2C
Sun Dec 01, 2019 5:00 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH scale
Replies: 12
Views: 59

pH scale

Why is the pH scale from 0-14 if it can be negative and go beyond 14?
by Aiden Metzner 2C
Sun Dec 01, 2019 4:58 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate acids/bases
Replies: 1
Views: 19

Conjugate acids/bases

I'm still not exactly sure what a conjugate acid is. If a molecule gives off a proton in a reaction, in the reverse reaction is it then the conjugate base since it receives a proton?
by Aiden Metzner 2C
Sun Dec 01, 2019 4:56 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Meaning of the constants
Replies: 2
Views: 27

Re: Meaning of the constants

A larger constant means it is a stronger base. Keep in mind the Ka value tends to be close to zero, so a 10^-2 value will be a stronger base then a 10^-6 value. However the pKa value is on a logarithmic scale and therefore a smaller pKa value means a stronger acid/base so a lower pH if it's an acid ...
by Aiden Metzner 2C
Sun Nov 24, 2019 3:44 pm
Forum: DeBroglie Equation
Topic: Slow Moving Large Objects
Replies: 2
Views: 32

Re: Slow Moving Large Objects

Even though in De Broglies wave equation yes it would technically have a wavelength. I think that De Broglies equation only applies to objects with relatively fast velocity. Something with an extremely low velocity would essentially just not be moving. The best example I could think of is a tectonic...
by Aiden Metzner 2C
Sun Nov 24, 2019 3:41 pm
Forum: Naming
Topic: Final
Replies: 3
Views: 22

Re: Final

There will definitely be review sessions. I'm almost positive on Friday of week 10 lavelle does a comprehensive review of important topics in class.
by Aiden Metzner 2C
Sun Nov 24, 2019 3:38 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Bronsted vs. Lewis Acids and Bases
Replies: 4
Views: 31

Bronsted vs. Lewis Acids and Bases

What is the difference between a Bronsted acid/base and a lewis acid/base?
by Aiden Metzner 2C
Sun Nov 24, 2019 3:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: transition metals
Replies: 2
Views: 14

Re: transition metals

Transition metals have different oxidation numbers depending on their environment. They can have different oxidation numbers because they are good for electron transfer so electrons can pass through them very easily. Certain oxidation numbers allow for a certain number of ligands to bind to these tr...
by Aiden Metzner 2C
Sun Nov 24, 2019 3:33 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 33

Re: Naming

If there is a molecule with an -ide at the end drop the ide and add an o. Another tip is cations go first and anions go second. Also if it is an anion you add ate to the end. There are a bunch of other strategies and I think there are also some exceptions to these rules.
by Aiden Metzner 2C
Sun Nov 17, 2019 1:40 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Dipole Moments
Replies: 3
Views: 14

Re: Dipole Moments

Dipole moments cancel when the dipoles in a molecule are facing opposite directions. However they also cancel in a trigonal planar because they are all 120 degrees apart and each dipole faces out, causing them all to cancel.
by Aiden Metzner 2C
Sun Nov 17, 2019 1:38 pm
Forum: Sigma & Pi Bonds
Topic: Test 2 Sigma and Pi bonds
Replies: 5
Views: 34

Test 2 Sigma and Pi bonds

Will Sigma and Pi bonds be on test 2? And if so what is the difference between a sigma and a pi bond, I don't recall going over this in class.
by Aiden Metzner 2C
Sun Nov 17, 2019 1:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Octahedral??
Replies: 4
Views: 21

Re: Octahedral??

I think it is because of the fact that it is a 3-D shape. So if it were in 2D it would be hexagonal, but due to the fact that it has molecules all of bond angle 90 degrees on the xyz plane it is an octahedral. Lavelle explained something about how the shape when drawn in geometric patterns relates t...
by Aiden Metzner 2C
Sun Nov 17, 2019 1:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vapor pressure
Replies: 4
Views: 16

Re: vapor pressure

I'm almost positive we don't have to know vapor pressure for this test. However if we do it is defined as the pressure exerted by a vapor when in thermodynamic equilibrium.
by Aiden Metzner 2C
Sun Nov 17, 2019 1:31 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: This Week Test
Replies: 12
Views: 68

This Week Test

Will the test this week just be on VSEPR model of atoms or will it also include interionic and intermolecular forces?
by Aiden Metzner 2C
Sun Nov 17, 2019 1:28 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Boiling Points
Replies: 7
Views: 39

Re: Boiling Points

Boiling points are dependent on the strength of force. The boiling point of a molecule is higher if the bonds are stronger because it takes more energy to break the bonds. So a molecule with shorter bonds will tend to have a higher boiling point.
by Aiden Metzner 2C
Sun Nov 17, 2019 1:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Strength of Repulsion
Replies: 4
Views: 22

Re: Strength of Repulsion

Lone pairs have a stronger repulsion because they are two negatively charged electrons. So they push repulse each-other a lot more then an electron and an atom would repulse because atoms don't have as strong of a negative charge if they are even charged at all. Just remember that lone-pairs are two...
by Aiden Metzner 2C
Sun Nov 17, 2019 1:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Interactions
Replies: 3
Views: 17

Re: Interactions

Yes to both questions, ion-dipole interactions are the strongest because ions tend to have a strong charge which attracts the charged dipoles of other molecules.
by Aiden Metzner 2C
Sun Nov 03, 2019 11:24 pm
Forum: SI Units, Unit Conversions
Topic: Converting SI units
Replies: 3
Views: 57

Converting SI units

What is the rule for converting SI units on the test. Will we be penalised if we get the sig figs wrong?
by Aiden Metzner 2C
Sun Nov 03, 2019 11:23 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 4
Views: 54

Re: Balancing Chemical Equations

From left to right I think that it is 6, 10 = 5, 9, 6, 3.
by Aiden Metzner 2C
Sun Nov 03, 2019 11:20 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy (Uncertainty) Equation
Replies: 1
Views: 35

Re: Heisenberg Indeterminacy (Uncertainty) Equation

There is an inverse relationship because h/4 pi is a constant. So since uncertainty in momentum and uncertainty in position multiply to be greater than that number, then as one gets bigger the other one will get smaller.
by Aiden Metzner 2C
Sun Nov 03, 2019 11:17 pm
Forum: Lewis Structures
Topic: Valence Electrons on Oxygen
Replies: 3
Views: 28

Re: Valence Electrons on Oxygen

Remember that chlorine is one of the three elements that regularly violates the octet rule. So it is likely that oxygen might double bond with chlorine in order to keep its octet, while chlorine would violate the rule since it doesn't need to be in octet to be stable.
by Aiden Metzner 2C
Sun Nov 03, 2019 11:12 pm
Forum: Electronegativity
Topic: Figuring it out without the trend?
Replies: 4
Views: 34

Re: Figuring it out without the trend?

Look at the periods and the groups, the farther right an element is in a group the more electronegative it is, and the farther up it is in a group the more electronegative it is.
by Aiden Metzner 2C
Fri Oct 25, 2019 3:37 pm
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 5
Views: 238

Re: Bond Lengths

Even though the bond lengths are represented as different, with double bonds, single bonds, etc. In resonance structures the electrons are delocalized, so the lewis structures aren't necessarily a good representation of how the molecule looks. In reality resonance structures share all the electrons ...
by Aiden Metzner 2C
Fri Oct 25, 2019 3:35 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 4
Views: 22

Expanded Valence Shells

Are phosphorus, sulfur and chlorine the only three elements with expanded valence shells?
by Aiden Metzner 2C
Fri Oct 25, 2019 3:33 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge and Molecules
Replies: 4
Views: 25

Formal Charge and Molecules

Does the formal charge of a molecule always equal its ionic charge? In class for the SO4 2- ion the charge was for the whole molecule. Was that just a coincidence or do the formal charges of each individual atom always add up to the formal charge of the molecule?
by Aiden Metzner 2C
Fri Oct 25, 2019 3:30 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 4
Views: 32

Re: Electron Affinity

Atoms always want to get to a their lowest possible energy. So it makes sense that electron affinity increases as you go towards the top right of the periodic table. Atoms like halogens have high electron affinities because they will release the most energy by getting to the stable noble gas state
by Aiden Metzner 2C
Fri Oct 25, 2019 3:26 pm
Forum: DeBroglie Equation
Topic: Linear Momentum
Replies: 6
Views: 61

Re: Linear Momentum

You somewhat answered your own question. Linear momentum relates to the de broglie equation in that it has an inverse relationship with wavelength. So yes a larger momentum means a smaller wavelength. For example a car moving 60 mph has a much larger momentum then an electron, so it has a much small...
by Aiden Metzner 2C
Sun Oct 20, 2019 4:36 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Speed
Replies: 2
Views: 20

Uncertainty in Speed

How do we calculate the uncertainty in speed if the speed is 5+- 5 m/s? Is the uncertainty 5m/s or 10?
by Aiden Metzner 2C
Sun Oct 20, 2019 4:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Inverse Relation
Replies: 3
Views: 48

Re: Inverse Relation

Yes, with more uncertainty in position comes less in position and vise versa because they multiply to a constant.
by Aiden Metzner 2C
Sun Oct 20, 2019 4:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.B.25
Replies: 1
Views: 23

Re: 1.B.25

It essentially just means that you use the diameter of the atom to use as the uncertainty in position of the electron. The model of the one dimensional box is a line where the position of the electron in uncertain, it just means you don't have to find the area of the atom.
by Aiden Metzner 2C
Fri Oct 18, 2019 5:00 pm
Forum: Photoelectric Effect
Topic: The Work Function
Replies: 15
Views: 89

Re: The Work Function

The work function is the energy it takes to expel an electron from a certain metal. The energy of the photon is E=hv and if you subtract the work function from that energy then the difference is the kinetic energy of the electron which is E=MV.
by Aiden Metzner 2C
Fri Oct 18, 2019 4:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg's uncertainty
Replies: 2
Views: 24

Re: Heisenberg's uncertainty

Electrons have to be outside of the atoms nucleus. Photons are in the nucleus, but if electrons were there, according to heisenbergs principle the uncertainty in the position would be too small and would therefore make the indeterminacy in the speed of the electron faster then the speed of light, wh...
by Aiden Metzner 2C
Sun Oct 13, 2019 6:56 pm
Forum: Limiting Reactant Calculations
Topic: Can't Find Limiting Reactant
Replies: 4
Views: 94

Re: Can't Find Limiting Reactant

You would first balance the equations and then convert the grams of each compound into moles. Then you would see which reactant would yield less of the product. By doing this you will see which reactant is limiting the mass of the product.
by Aiden Metzner 2C
Sun Oct 13, 2019 6:54 pm
Forum: Significant Figures
Topic: Significant Figures on Test 1
Replies: 3
Views: 74

Significant Figures on Test 1

I was just curious the rule that we were supposed to used for answering with signifigant figures on test 1? I was also wondering if the T.A's will be grading with sig figs in mind on this test?
by Aiden Metzner 2C
Sun Oct 13, 2019 6:51 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 2
Views: 272

Re: Black Body Radiation

Black body radiation is not at all prevalent in our daily lives. Although it does exist in black holes to the extent of my knowledge there is no black body radiation present on Earth.
by Aiden Metzner 2C
Sun Oct 13, 2019 6:43 pm
Forum: Properties of Electrons
Topic: Interference.
Replies: 2
Views: 28

Re: Interference.

As illustrated in Professor Lavelle's standing wave diagram, energy levels can be seen through the electrons patterns of constructive and destructive interference patterns. You can visualize an electrons wave pattern by looking at the standing wave motion and how it switches from peaks to valleys, i...
by Aiden Metzner 2C
Sun Oct 13, 2019 6:41 pm
Forum: Properties of Light
Topic: Atomic Spectra Pre-Assessment #12
Replies: 2
Views: 18

Re: Atomic Spectra Pre-Assessment #12

Not sure the exact setup but in lecture Professor Lavelle spoke of pointing a light source at whatever metal you are testing. If electrons are ejected from that metal then the light source has a high enough frequency/energy to raise the electron to its second energy level (n=2).
by Aiden Metzner 2C
Fri Oct 04, 2019 2:21 pm
Forum: Limiting Reactant Calculations
Topic: L7
Replies: 2
Views: 34

L7

How is it possible that the mass of water in the products is so much larger than the mass of the fat that is given in the reactants side? Isn't it impossible for mass to be created during a reaction?
by Aiden Metzner 2C
Fri Oct 04, 2019 2:20 pm
Forum: Molarity, Solutions, Dilutions
Topic: G11
Replies: 1
Views: 30

G11

I'm confused how to use the equation M1V1 = M2V2 when they only give us two molarities. Is there another equation we are supposed to be given?
by Aiden Metzner 2C
Fri Oct 04, 2019 2:17 pm
Forum: SI Units, Unit Conversions
Topic: Fundamental G.7
Replies: 2
Views: 34

Re: Fundamental G.7

You essentially have to multiply the grams of the solution by the percentage of K2NO3. Then you use that amount of K2NO3 that you get in grams and the molar mass to calculate how many moles of K2NO3 that you need. So you do have to multiply the grams of K2NO3 by the molar mass using the periodic table
by Aiden Metzner 2C
Fri Oct 04, 2019 2:17 pm
Forum: SI Units, Unit Conversions
Topic: Fundamental G.7
Replies: 2
Views: 34

Re: Fundamental G.7

You essentially have to multiply the grams of the solution by the percentage of K2NO3. Then you use that amount of K2NO3 that you get in grams and the molar mass to calculate how many moles of K2NO3 that you need. So you do have to multiply the grams of K2NO3 by the molar mass using the periodic table
by Aiden Metzner 2C
Fri Oct 04, 2019 2:10 pm
Forum: Significant Figures
Topic: Sig Figs given in problem vs solution
Replies: 3
Views: 32

Re: Sig Figs given in problem vs solution

Yes, because the accuracy of your calculations shouldn't go beyond the accuracy of what is given to you in the problems. If you have more sig figs than you are essentially being too specific.
by Aiden Metzner 2C
Fri Oct 04, 2019 2:05 pm
Forum: SI Units, Unit Conversions
Topic: When are the 5 posts due?
Replies: 6
Views: 51

Re: When are the 5 posts due?

I'm pretty sure they are due Friday, however I don't know what time exactly. I'd recommend doing them before Friday just in case.

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