Search found 59 matches
- Wed Mar 13, 2019 10:12 pm
- Forum: General Rate Laws
- Topic: rate laws and graphs
- Replies: 4
- Views: 528
Re: rate laws and graphs
You should probably know what the graphs generally look like and how the graphs are related to the equations.
- Wed Mar 13, 2019 10:11 pm
- Forum: General Rate Laws
- Topic: Rate equations to know
- Replies: 5
- Views: 514
Re: Rate equations to know
You should probably know the different rate laws, and the different equations that can be derived from them or link them to other equations.
- Wed Mar 13, 2019 10:10 pm
- Forum: General Rate Laws
- Topic: reaction rate vs. unique reaction rate
- Replies: 3
- Views: 381
Re: reaction rate vs. unique reaction rate
unique reaction rate takes into account stoichiometric coefficients, or the order of the reaction
- Tue Mar 05, 2019 7:32 pm
- Forum: General Rate Laws
- Topic: Units of Rate Constant
- Replies: 4
- Views: 477
Re: Units of Rate Constant
each order's units are different. However, Cole's units are correct and are very helpful in figuring out which order is being used.
- Tue Mar 05, 2019 7:31 pm
- Forum: Zero Order Reactions
- Topic: Units of k in Zero Order Reactions
- Replies: 4
- Views: 449
Re: Units of k in Zero Order Reactions
both are the same. and depending on which order it is, you would change it accordingly.
- Tue Mar 05, 2019 7:29 pm
- Forum: Zero Order Reactions
- Topic: Different Orders
- Replies: 5
- Views: 548
Re: Different Orders
According to my TA, we will only be focusing on 0,1,and 2.
- Tue Mar 05, 2019 7:29 pm
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 5
- Views: 538
Re: Half life
theres different half life reactions for zero, 1st, and 2nd order. Only 1st order is independent of the concentration of A.
- Tue Mar 05, 2019 7:28 pm
- Forum: General Rate Laws
- Topic: Unique Rate
- Replies: 4
- Views: 373
Re: Unique Rate
the unique rate produces the same rate no matter which species you use.
- Wed Feb 20, 2019 4:49 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs concept
- Replies: 7
- Views: 709
Re: Gibbs concept
Gibbs is the amount of free energy available to do work, but is related to enthalpy and entropy.
- Wed Feb 20, 2019 4:46 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: irreversible v reversible
- Replies: 4
- Views: 648
Re: irreversible v reversible
Since S is a state function, the path it takes doesn't matter, therefore if it returns to the original state, entropy is 0.
- Wed Feb 20, 2019 4:45 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta Srxn
- Replies: 4
- Views: 3125
Re: Delta Srxn
m is just molar! so Sm is molar entropy
- Wed Feb 20, 2019 4:43 pm
- Forum: Van't Hoff Equation
- Topic: when to use
- Replies: 4
- Views: 447
Re: when to use
van't hoff equation helps establish a relationship between K and Gibbs
- Wed Feb 20, 2019 4:41 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Max Work
- Replies: 5
- Views: 542
Re: Max Work
Max work occurs reversibly at constant temp and pressure
- Wed Feb 20, 2019 4:40 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Units for Gibbs
- Replies: 8
- Views: 909
Re: Units for Gibbs
It doesn't matter which one you convert to, as long as you make sure both are in the same units
- Sat Feb 09, 2019 11:57 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated System
- Replies: 5
- Views: 767
Re: Isolated System
Isolated systems take away any other factors that can be impacting the reaction.
- Sat Feb 09, 2019 11:57 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed systems
- Replies: 6
- Views: 576
Re: closed systems
They can have both. However heat can be transferred in a closed system.
- Sat Feb 09, 2019 11:56 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Midterm [ENDORSED]
- Replies: 49
- Views: 4715
Re: Midterm [ENDORSED]
The workshops are so so helpful!! Definitely go to Lyndon's, but make sure you go early to save yourself a seat!
- Sat Feb 02, 2019 1:59 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Work Calculation
- Replies: 3
- Views: 297
Re: Work Calculation
the negative sign tells us whether the system is doing work or if work is being done on they system
- Sat Feb 02, 2019 1:59 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: breaking double bonds?
- Replies: 6
- Views: 1259
Re: breaking double bonds?
single bonds are not just the half of a double bond. instead to break a double bond and form a single bond, the double bond has to break completely
- Sat Feb 02, 2019 1:57 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase change and temperature
- Replies: 3
- Views: 372
Re: Phase change and temperature
all of the energy used is for the transition phase so doesn't get used up.
- Sat Feb 02, 2019 1:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Entropy vs Enthalpy concept
- Replies: 3
- Views: 308
Re: Entropy vs Enthalpy concept
enthalpy is the total amount of energy while entropy represents the internal disorder that results every time energy is transferred
- Sat Feb 02, 2019 1:55 pm
- Forum: Phase Changes & Related Calculations
- Topic: What Does U and q stand for?
- Replies: 9
- Views: 2250
Re: What Does U and q stand for?
U is the internal energy while q is the internal heat.
- Sat Feb 02, 2019 1:54 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam
- Replies: 11
- Views: 951
Re: Steam
steam causes more severe burns because steam has more energy if you look at its heating curve.
- Sat Jan 19, 2019 3:13 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Catalysts
- Replies: 7
- Views: 683
Re: Catalysts
Catalysts only effect the activation energy, and doesn't effect the reaction itself at all.
- Sat Jan 19, 2019 3:12 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Weak Acids and Bases
- Replies: 7
- Views: 779
Re: Weak Acids and Bases
I think memorizing the strong acids and bases would be helpful, but if the Ka or Kb is given, you will be able to know if its weak or strong based on how small the number is.
- Sat Jan 19, 2019 3:11 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Understanding Q
- Replies: 9
- Views: 723
Re: Understanding Q
Hi!
Q is calculated the same way as K, but instead of being the equilibrium concentration, it can tell you which way the reaction is proceeding.
Q is calculated the same way as K, but instead of being the equilibrium concentration, it can tell you which way the reaction is proceeding.
- Sun Jan 13, 2019 7:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equations
- Replies: 10
- Views: 709
Re: equations
You would have to figure out the equation. Some equations are more familiar and you would be able to figure it out easily. For others, theres probably context or hints as to which are the reactants or products.
- Sun Jan 13, 2019 7:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: solids and liquids
- Replies: 5
- Views: 546
Re: solids and liquids
Solid and Liquid concentrations change very little, and the amount is insignificant so that they don't need to be included.
- Sun Jan 13, 2019 7:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: constants
- Replies: 4
- Views: 333
Re: constants
Hi! Kc, Kp, and Q are all very similar. Kc is just the equilibrium concentration while Kp is the pressure at equilibrium. Q finds which way the reaction is going.
- Sun Jan 13, 2019 7:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure and Concentration [ENDORSED]
- Replies: 3
- Views: 208
Re: Partial Pressure and Concentration [ENDORSED]
Hi! I think in that case you would just use PV= nRT to convert!
- Sun Dec 09, 2018 12:16 am
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acids and Bases Concept
- Replies: 2
- Views: 410
Re: Conjugate Acids and Bases Concept
Yes, they both correspond to each other.
- Sun Dec 09, 2018 12:14 am
- Forum: Naming
- Topic: Polarizability
- Replies: 2
- Views: 425
Re: Polarizability
The bigger the radius, the more polarizable. And with more electrons, it will also be more polarizable.
- Sun Dec 09, 2018 12:13 am
- Forum: Naming
- Topic: Ligand Names
- Replies: 4
- Views: 614
Re: Ligand Names
I think you can use either. Many TAs and UAs have said they prefer the old names, which makes sense because they're easier. For the test, both will be correct.
- Sun Dec 09, 2018 12:12 am
- Forum: Naming
- Topic: Shorthands
- Replies: 2
- Views: 332
Re: Shorthands
it can be used when naming, but when putting it in brackets, you should know what it consists of. Also better to just know the full name as well.
- Sun Dec 09, 2018 12:11 am
- Forum: Naming
- Topic: Memorizing Ligands
- Replies: 2
- Views: 331
Re: Memorizing Ligands
I just compared the ones with similar names and figured out what adding each molecule does. For example, in CN-, NC-, or SCN- or NCS-, adding the S adds a thio-. When N is moved to the front, it adds an iso-
- Sun Dec 09, 2018 12:09 am
- Forum: Naming
- Topic: Coordination Compound Charges
- Replies: 1
- Views: 148
Re: Coordination Compound Charges
Yes unless theres another molecule that balances it all out.
- Sun Dec 09, 2018 12:09 am
- Forum: Naming
- Topic: Order of ligands
- Replies: 6
- Views: 801
Re: Order of ligands
It doesn't matter in the square brackets, only when you're naming it.
- Sat Nov 17, 2018 10:12 pm
- Forum: Dipole Moments
- Topic: sigma, pi bonds rotation
- Replies: 2
- Views: 123
Re: sigma, pi bonds rotation
When it cannot rotate around, the bond ends up breaking.
- Sat Nov 17, 2018 10:10 pm
- Forum: Octet Exceptions
- Topic: Tin with only 6 electrons
- Replies: 4
- Views: 857
Re: Tin with only 6 electrons
Since tin isn't in the first period, it can be an exception to the rule.
- Sat Nov 17, 2018 10:06 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and Pi Bonds affect on structure
- Replies: 4
- Views: 416
Re: Sigma and Pi Bonds affect on structure
Sigma and Pi bonds do not affect structure. The only things that impact the structure is the lone pairs and bonds
- Sun Nov 11, 2018 11:20 pm
- Forum: Resonance Structures
- Topic: Hybrid Resonance
- Replies: 4
- Views: 630
Re: Hybrid Resonance
Hybrid resonance is just kind of the average of all possible resonance structures.
- Sun Nov 11, 2018 11:18 pm
- Forum: Octet Exceptions
- Topic: Copper ion electron structure
- Replies: 3
- Views: 777
Re: Copper ion electron structure
"Cu2+ ends up having the electron structure [Ar] 3d9. Why would this be, since filling the d orbital in this way does not result in a fully filled d orbital? Why is the structure not [Ar]3d7 4s2?" One easier way to figure it out is by first using the ground state configuration: Cu: [Ar] 3d...
- Sun Nov 11, 2018 11:15 pm
- Forum: Electronegativity
- Topic: Greater Ionic character
- Replies: 3
- Views: 507
Re: Greater Ionic character
Since Sulfur is below Oxygen in the periodic table, it is less electronegative. So Carbon and Oxygen have greater difference in electronegativity.
- Fri Nov 02, 2018 7:35 pm
- Forum: Dipole Moments
- Topic: Midterm Dipole Moments?
- Replies: 4
- Views: 410
Re: Midterm Dipole Moments?
The stuff we learned today will not be on the midterm, but is always good to keep in mind!
- Fri Nov 02, 2018 7:34 pm
- Forum: Electronegativity
- Topic: Periodic Trends
- Replies: 10
- Views: 1194
Re: Periodic Trends
Ionization energy and electronegativity both increase up and to the right.
Atomic radius increases down and to the left.
Atomic radius increases down and to the left.
- Fri Nov 02, 2018 7:13 pm
- Forum: Octet Exceptions
- Topic: Boron and Aluminum
- Replies: 2
- Views: 332
Re: Boron and Aluminum
Boron is electron deficient, and usually only makes three covalent bonds. This means that it only has 6 valence electrons.
- Sun Oct 28, 2018 11:04 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Indeterminacy Equation
- Replies: 4
- Views: 476
Re: Heisenberg Indeterminacy Equation
The formula shows that you will either know the momentum or the position. And they are both uncertain. The higher certainty of one means that there is more uncertainty of the other.
- Sun Oct 28, 2018 11:01 pm
- Forum: Photoelectric Effect
- Topic: HW 1.3
- Replies: 4
- Views: 521
Re: HW 1.3
Hi, I also think C is the right answer as frequency decreases, the wavelength changes. The slope therefore decreases.
- Wed Oct 24, 2018 11:31 am
- Forum: Properties of Electrons
- Topic: Degeneracy
- Replies: 11
- Views: 1214
Degeneracy
Hi! Can someone please explain degeneracy of electrons?
Thanks
Thanks
- Fri Oct 19, 2018 12:56 am
- Forum: Properties of Light
- Topic: Electromagnetic Radiation
- Replies: 3
- Views: 229
Re: Electromagnetic Radiation
Hi!
In this question, extent of change is really just asking how the slope is changing. When frequency decreases, the slope also decreases.
In this question, extent of change is really just asking how the slope is changing. When frequency decreases, the slope also decreases.
- Fri Oct 19, 2018 12:49 am
- Forum: Properties of Electrons
- Topic: electrons
- Replies: 3
- Views: 222
Re: electrons
It is impacted by electron repulsion, where electrons repel each other because of their charge. Electrons will stay as far as they can from each other, while also still staying in their orbital.
- Fri Oct 19, 2018 12:47 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Video Modules
- Replies: 7
- Views: 730
Re: Video Modules
As of right now, Prof Lavelle has not posted any more modules. Hopefully after he introduces the next topic, he will upload more modules.
- Fri Oct 12, 2018 12:06 am
- Forum: Properties of Light
- Topic: Homework Question 1.3, 6th Edition
- Replies: 2
- Views: 271
Re: Homework Question 1.3, 6th Edition
"Does this happen when the frequency of light decreases? Why?
(c) The extent of the change in the electrical field at a given
point decreases."
Yes because as frequency changes, the waves become wider and longer, which means the slope decreases as well.
(c) The extent of the change in the electrical field at a given
point decreases."
Yes because as frequency changes, the waves become wider and longer, which means the slope decreases as well.
- Fri Oct 12, 2018 12:03 am
- Forum: Properties of Light
- Topic: How light behaves
- Replies: 8
- Views: 529
Re: How light behaves
Photons are packets of energy, but the energy can be seen as wavelengths. The wavelengths can show the amount of energy and frequency.
- Fri Oct 12, 2018 12:01 am
- Forum: Properties of Light
- Topic: Problem number 1.23 [ENDORSED]
- Replies: 3
- Views: 361
Re: Problem number 1.23 [ENDORSED]
1 kilo-electronvolt = 1.60218^-16 Joules
- Fri Oct 05, 2018 1:13 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula
- Replies: 6
- Views: 574
Re: Empirical Formula
We just assume that it is 100g unless otherwise stated to make it easier to calculate percentages.
- Thu Oct 04, 2018 11:55 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Q E27
- Replies: 4
- Views: 414
Re: Q E27
To find the mass of one water molecule, divide it by Avogadro's number and then multiply it by the molar mass of water.
- Mon Oct 01, 2018 9:59 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molarity
- Replies: 3
- Views: 4221
Re: Molarity
Thank you so much!
- Mon Oct 01, 2018 9:09 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molarity
- Replies: 3
- Views: 4221
Molarity
How do I find the amount of moles for water molecules in MgSo4 + 7H2O (epsom salts) when there is 5.15g of epsom salt?