Search found 104 matches

by Aiden Metzner 2C
Mon Mar 16, 2020 4:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Voltaic Cells
Replies: 3
Views: 27

Voltaic Cells

Are voltaic cells the same as galvanic cells?
by Aiden Metzner 2C
Mon Mar 16, 2020 4:04 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy
Replies: 3
Views: 19

Re: Activation Energy

If the reaction is endothermic, increasing the temperature lowers the activation energy because it adds energy to the system. For the endothermic reaction this makes it easier for the reactants to form products, this is the opposite for an exothermic reaction.
by Aiden Metzner 2C
Mon Mar 16, 2020 4:02 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Initial vs Unique Rates
Replies: 3
Views: 21

Re: Initial vs Unique Rates

The initial rate is the rate when there are only reactants, and it is the rate that the reactants are used up in a reaction. The unique rate is the rate a molecule is used up divided by its stoichiometric coefficient, all molecules in a reaction will have the same unique rate.
by Aiden Metzner 2C
Mon Mar 16, 2020 3:58 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 4
Views: 40

Re: oxidation numbers

Count the oxygens and hydrogens in the molecule. The oxygens are -2 and the hydrogens are +1, the other element in the molecule will add to these elements to get the molecule to whatever charge it is.
by Aiden Metzner 2C
Mon Mar 16, 2020 3:57 pm
Forum: Second Order Reactions
Topic: 2nd order
Replies: 6
Views: 39

Re: 2nd order

If you look at the units and liters and seconds are in the denominator then it is second order.
by Aiden Metzner 2C
Mon Mar 16, 2020 1:40 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Reverse rate Laws
Replies: 3
Views: 22

Re: Reverse rate Laws

If you are given the K for the forward reaction and the overall K then you can determine the K for the backwards reaction and thus determine the rate for the backwards reaction
by Aiden Metzner 2C
Mon Mar 16, 2020 1:38 am
Forum: First Order Reactions
Topic: order of a reaction
Replies: 2
Views: 24

Re: order of a reaction

Depending on what you are given you can tell. If you are just given the reaction, then you can tell what order it is by looking at how each reactant affects the rate. If you are given a certain unit for the k value, then you can also tell the order.
by Aiden Metzner 2C
Mon Mar 16, 2020 1:36 am
Forum: Balancing Redox Reactions
Topic: Ecell values
Replies: 12
Views: 87

Re: Ecell values

The higher Ecell value is usually reduced because the E cell values are the standard values of reduction. One that produces a higher value that is reduced is more likely to be reduced in a reaction.
by Aiden Metzner 2C
Mon Mar 16, 2020 1:35 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 8
Views: 50

Concentration Cells

Why is the standard cell potential of a concentration cell always equal to 0?
by Aiden Metzner 2C
Mon Mar 16, 2020 1:34 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: concentration
Replies: 3
Views: 31

Re: concentration

Because the only thing that is making the cell have a potential is the difference in concentration between the cathode and the anode, so changing the concentration of one or both will affect the cell potential.
by Aiden Metzner 2C
Tue Mar 10, 2020 12:40 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Work and Delta G
Replies: 4
Views: 24

Work and Delta G

I believe Dr. Lavelle mentioned in lecture that W = -nfe and G = -nfe. Is this true for all reactions? Or is it only for standard conditions?
by Aiden Metzner 2C
Tue Mar 10, 2020 12:37 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Downs Process
Replies: 4
Views: 36

Re: Downs Process

No the Downs Process was never really gone over in lecture and isn't covered in the homework so it likely won't be on the final exam.
by Aiden Metzner 2C
Tue Mar 10, 2020 12:32 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Reactant for Initial Rate
Replies: 2
Views: 18

Re: Reactant for Initial Rate

We only use reactant rate for initial rate because we assume there are only reactants and no products when just starting the reaction, this is why it is known as initial rate. This is used for all reactions
by Aiden Metzner 2C
Tue Mar 10, 2020 12:11 am
Forum: Second Order Reactions
Topic: Derivations of Reactions
Replies: 3
Views: 14

Re: Derivations of Reactions

I'm pretty sure we just need to know the final equations associated with each of the derived equations. A lot of the time equations are derived for us in class so we can understand them better but we don't need to fully apply all the derivations
by Aiden Metzner 2C
Tue Mar 10, 2020 12:03 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Study Advice
Replies: 73
Views: 3503

Re: Study Advice

I like doing all the homework problems in the textbook because Lavelle loves putting problems like those on the test. I also like to review past midterms and exams.
by Aiden Metzner 2C
Thu Mar 05, 2020 11:02 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: different units
Replies: 4
Views: 50

Re: different units

Each different ordered reactions involve having the concentrations be increased to certain powers. ^2 for second order. Therefore the units are changed by that order as well.
by Aiden Metzner 2C
Thu Mar 05, 2020 11:00 pm
Forum: General Rate Laws
Topic: Rate Law Slopes
Replies: 3
Views: 34

Rate Law Slopes

In lecture it seemed like professor said that k is always the slope of the graph of the rate. Is this true for zero order, first order, and second order reactions. Or is it only true for zero order?
by Aiden Metzner 2C
Wed Mar 04, 2020 12:20 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: electrolysis calculations
Replies: 2
Views: 40

Re: electrolysis calculations

I'm pretty sure that at least for test 2 we will not have to do any calculations involving electrolysis.
by Aiden Metzner 2C
Wed Mar 04, 2020 12:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: equation for Q
Replies: 3
Views: 36

Re: equation for Q

Yes for Q the anode is always over the cathode. It is very confusing because you would think it would be cathode over anode but in the case of the nernst equation it is the opposite
by Aiden Metzner 2C
Wed Mar 04, 2020 12:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Figuring out n
Replies: 15
Views: 83

Figuring out n

When using the equation G= -nFe how do we determine what n is?
by Aiden Metzner 2C
Mon Feb 24, 2020 12:34 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic vs. electrolytic
Replies: 4
Views: 29

Re: Galvanic vs. electrolytic

An electrolytic cell converts electrical energy into chemical energy, a galvanic cell converts chemical energy to electrical energy.
by Aiden Metzner 2C
Mon Feb 24, 2020 12:33 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: G in standard conditions
Replies: 2
Views: 28

Re: G in standard conditions

You can also calculate G in standard states using the Gfinal-Ginitial, and you can do the same with G in non standard states, since G is a state function
by Aiden Metzner 2C
Mon Feb 24, 2020 12:30 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Estimating Delta G
Replies: 2
Views: 28

Re: Estimating Delta G

I'm pretty sure since you are subtracting electric potential, a negative electric potential means that delta G is positive. So whatever the sign of the electric potential, delta G will always be the opposite
by Aiden Metzner 2C
Mon Feb 24, 2020 12:26 am
Forum: Balancing Redox Reactions
Topic: half reaction
Replies: 10
Views: 89

Re: half reaction

You include water in the half reaction when you need to balance O2 in the reaction. Then if there are left over H+ ions you include water in the reaction as well as OH- ions
by Aiden Metzner 2C
Mon Feb 24, 2020 12:25 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2
Replies: 6
Views: 60

Re: Test 2

Yeah it is everything we've learned after the midterm until the end of electrochemistry I think
by Aiden Metzner 2C
Wed Feb 19, 2020 1:35 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 3
Views: 32

Van't Hoff Equation

I'm not sure when we apply this equation. Can someone explain to me what types of problems we use this equation for?
by Aiden Metzner 2C
Wed Feb 19, 2020 1:28 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Sign of delta G
Replies: 9
Views: 81

Sign of delta G

Instead of using the sign of delta G to determine which way a reaction can proceed. Could we also just figure out if Q is less then or more then K and decide that way?
by Aiden Metzner 2C
Wed Feb 19, 2020 1:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 45
Views: 377

Re: Midterm Curve

He curves the class based on the total overall scores. Don't expect your midterm score to be curved but likely if everyones final class scores are lower then expected he will curve the class
by Aiden Metzner 2C
Wed Feb 19, 2020 1:23 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Midterm question 8 [ENDORSED]
Replies: 5
Views: 99

Midterm question 8 [ENDORSED]

On the midterm we were asked how entropy is different based on irreversible expansion or reversible expansion. Is it true that entropy is the same for both since it is a state function?
by Aiden Metzner 2C
Wed Feb 19, 2020 1:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 4
Views: 26

Salt Bridge

What is the salt bridges function in a galvanic cell/battery?
by Aiden Metzner 2C
Wed Feb 19, 2020 1:17 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Differences in Heat Capacity
Replies: 4
Views: 58

Re: Differences in Heat Capacity

We need to know heat capacity for calorimeters, which is just the heat capacity required to raise a substance 1 degree celcius. But also specific and molar heat capacities are important to know. Specific being the amount of heat required to raise 1 gram of a substance 1 degree celcius, and molar bei...
by Aiden Metzner 2C
Wed Feb 19, 2020 1:12 pm
Forum: Balancing Redox Reactions
Topic: Test 2 [ENDORSED]
Replies: 12
Views: 110

Test 2 [ENDORSED]

Is test 2 next week? And if so what subject areas is it covering?
by Aiden Metzner 2C
Sun Feb 02, 2020 11:46 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 2
Views: 19

Re: Bond Enthalpies

Normally you are given the bond enthalpy when trying to solve the problem. I don't think we have to learn how to calculate the enthalpy of a broken bond.
by Aiden Metzner 2C
Sun Feb 02, 2020 11:45 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Enthalpy
Replies: 1
Views: 20

Enthalpy

What is the difference between entropy and heat gained/lost? I'm still very unclear on this.
by Aiden Metzner 2C
Sun Feb 02, 2020 11:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa and pKb
Replies: 3
Views: 35

Re: pKa and pKb

You know the most essential parts. Just know that for acidic reactions you should apply pKa. If you are only given pKb then you can calculate pKa because their products are equal to 14.
by Aiden Metzner 2C
Sun Feb 02, 2020 11:42 pm
Forum: Ideal Gases
Topic: Ideal gas constant
Replies: 4
Views: 39

Re: Ideal gas constant

They might have different units associated with them, or maybe one is for higher pressure and one is for lower pressure. If they are associated with the same units then you may be able to use them interchangeably.
by Aiden Metzner 2C
Sun Feb 02, 2020 11:39 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Car Engine
Replies: 4
Views: 45

Re: Car Engine

Because it gives off heat to its surroundings and also mass is inputed into the system from gasoline
by Aiden Metzner 2C
Sun Jan 26, 2020 9:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Different Enthalpy Strategies
Replies: 5
Views: 33

Different Enthalpy Strategies

Is there any benefit to using one strategy for calculating bond enthalpies over another? Or will we be asked to use certain strategies based on what the question is asking?
by Aiden Metzner 2C
Sun Jan 26, 2020 9:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Midterm
Replies: 8
Views: 76

Midterm

Anyone know what week the midterm is? Is it week 6?
by Aiden Metzner 2C
Sun Jan 26, 2020 9:18 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Water Phase Change
Replies: 6
Views: 32

Re: Water Phase Change

It is because there is energy required to break bonds between water molecules. The hydrogen bonds in water are strong so it takes a lot of energy, therefore more energy is stored in gas at the same temperature than at liquid.
by Aiden Metzner 2C
Sun Jan 26, 2020 9:16 pm
Forum: Ideal Gases
Topic: PLF material
Replies: 3
Views: 51

Re: PLF material

If they are based on the same material then they likely use similar if not the same worksheets. I doubt you will miss much if you attend one session over the other.
by Aiden Metzner 2C
Sun Jan 26, 2020 9:14 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy Calculations
Replies: 5
Views: 27

Re: Enthalpy Calculations

I doubt we will have to memorize any formulas as in most Lavelle classes the formulas are all provided on the test.
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: 31

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: 39

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: 25

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: 7
Views: 47

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: 18

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: 22

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: 69

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: 31

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: 52

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: 39

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: 61

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: 45

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: 54

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: 58

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: 24

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: 41

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: 17

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: 67

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: 26

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: 70

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: 79

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: 24

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: 35

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: 61

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: 37

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: 45

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: 21

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: 42

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: 24

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: 50

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: 33

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: 33

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: 93

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: 61

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: 33

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: 29

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: 91

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: 91

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: 42

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: 39

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: 46

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: 307

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: 31

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: 35

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: 40

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: 90

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: 33

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: 73

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: 34

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: 133

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: 34

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: 144

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: 121

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: 331

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: 39

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: 24

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: 58

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: 44

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?

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