Search found 59 matches
- Sun Mar 17, 2019 9:14 am
- Forum: Ideal Gases
- Topic: non gases
- Replies: 3
- Views: 547
non gases
Since the ideal gas law only applies to gases, does that mean we can just ignore the non-gases?
- Sun Mar 17, 2019 9:12 am
- Forum: Phase Changes & Related Calculations
- Topic: heating curves
- Replies: 4
- Views: 1506
heating curves
do all molecules follow the same type of basic shape as the water graph?
- Sun Mar 17, 2019 9:10 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius eq
- Replies: 3
- Views: 689
Arrhenius eq
Can we assume A will be 1 unless the question specifies that we have to solve for it?
- Sun Mar 17, 2019 9:09 am
- Forum: First Order Reactions
- Topic: 1st order decay?
- Replies: 2
- Views: 493
1st order decay?
Are all First Order Reactions decay functions
- Sun Mar 17, 2019 9:08 am
- Forum: Second Order Reactions
- Topic: rate
- Replies: 3
- Views: 573
rate
What is the relationship between the second order and it's rate?
- Sun Mar 17, 2019 9:07 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: units of T
- Replies: 11
- Views: 1089
units of T
Does it matter if time is in min/sec/hr if the question doesn't specifically state what it wants?
- Sun Mar 17, 2019 9:06 am
- Forum: General Rate Laws
- Topic: mmol units
- Replies: 2
- Views: 601
mmol units
When finding rate laws and rate constants that usually have mmol in the units, do we always want to convert? In the textbook, it doesn't convert mmol in problem 14.17, but does convert them in problem 14.19.
- Sun Mar 17, 2019 9:05 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: zero order reaction
- Replies: 29
- Views: 1342
zero order reaction
Why is it a zero order reaction with slope -k if the straight line fits to the data?
- Sun Mar 17, 2019 9:04 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: intermediate
- Replies: 26
- Views: 2063
intermediate
How are you able to tell what the intermediate is and why can't it exist in the rate law?
- Thu Feb 28, 2019 5:19 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: reducing power
- Replies: 2
- Views: 236
reducing power
How do you know which elements are increasing in reducing power?
- Thu Feb 28, 2019 5:17 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: anode and cathode placement
- Replies: 3
- Views: 374
anode and cathode placement
Is the anode always on the left of the salt bridge and the cathode is always on the right side in a cell diagram
- Thu Feb 28, 2019 5:15 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H and Delta U
- Replies: 1
- Views: 243
Delta H and Delta U
Why is it that when no work is being done Delta H equals Delta U.
- Thu Feb 28, 2019 5:07 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: speed of reaction based on activation energy
- Replies: 6
- Views: 667
speed of reaction based on activation energy
If a reaction has a higher activation energy, does this mean that the reaction is slower?
- Thu Feb 28, 2019 5:03 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Standard cell potential of H
- Replies: 2
- Views: 361
Standard cell potential of H
For the reaction, 2H+(aq) + 2e- = H2(g), why is the standard cell potential always 0?
- Thu Feb 28, 2019 5:01 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Max work
- Replies: 2
- Views: 394
Max work
Why does maximum work of a battery = delta G at constant temperature and pressure?
- Thu Feb 28, 2019 4:59 am
- Forum: Balancing Redox Reactions
- Topic: Oxidation state
- Replies: 2
- Views: 288
Oxidation state
To calculate oxidation state in half reactions. Do you just multiply the charges by the coefficient to find the total oxidation state?
- Thu Feb 28, 2019 4:56 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Adiabatic and isothermal
- Replies: 6
- Views: 2271
Adiabatic and isothermal
What is the difference between an adiabatic system and an isothermal system?
- Thu Feb 28, 2019 4:55 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: internal energy
- Replies: 3
- Views: 399
internal energy
Is the change in internal energy for irreversible expansion always 0?
- Thu Feb 28, 2019 4:52 am
- Forum: Van't Hoff Equation
- Topic: Constants
- Replies: 3
- Views: 658
Constants
why we can assume that deltaH and deltaS are constant when using the Van't Hoff equation to calculate K at different temperatures?
- Thu Feb 28, 2019 4:51 am
- Forum: Calculating Work of Expansion
- Topic: Calculating work
- Replies: 1
- Views: 494
Calculating work
When calculating work, is it negative only when it is expanding? Would it be positive when it isn't?
- Sun Feb 24, 2019 4:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Ecell
- Replies: 13
- Views: 1501
Ecell
How is Ecell calculated just by looking at the half reactions?
- Tue Jan 29, 2019 9:54 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy equations
- Replies: 2
- Views: 227
Enthalpy equations
are there any states of matter in which molecules (solid, liquid, aqueous) in a chemical equation that you would exclude when calculating reaction enthalpy or entropy?
- Tue Jan 29, 2019 9:51 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Isolated systems
- Replies: 10
- Views: 812
Isolated systems
In an isolated system, are we assuming that it is constant volume?
- Tue Jan 29, 2019 9:49 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeter vacuums
- Replies: 1
- Views: 302
Calorimeter vacuums
Are bomb calorimeters considered vacuums?
- Tue Jan 29, 2019 9:48 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeters
- Replies: 3
- Views: 371
Calorimeters
Is it important for us to know how Calorimeters for future problems?
- Fri Jan 18, 2019 5:26 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: temperature
- Replies: 2
- Views: 337
temperature
How do you account for temp in an equation when the neutral water is not 25 degrees C, what changes do you make to the equation?
- Fri Jan 18, 2019 5:08 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: acids and bases
- Replies: 2
- Views: 260
acids and bases
Is there any trick to memorize the strong acids vs the weak or is it mainly just memorization?
- Fri Jan 18, 2019 5:06 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring solids
- Replies: 6
- Views: 765
ignoring solids
Why do we ignore liquids calculating Q? I was doing problem 11.13 and was confused how they got that answer for part a
- Fri Jan 18, 2019 5:02 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Example in class
- Replies: 5
- Views: 586
Example in class
When we were talking about that one example that had to do with pressure, why did we use Q instead of Kp to calculate the new pressure?
- Wed Jan 09, 2019 3:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: example in class
- Replies: 3
- Views: 334
example in class
For the ADP example in class, to get the final EQ concentration for the ADP and Pi did he just subtract final from initial to get the concentration?
- Sun Dec 09, 2018 9:00 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polarity of trigonal planar [ENDORSED]
- Replies: 1
- Views: 5436
polarity of trigonal planar [ENDORSED]
How is trigonal planar considered non polar?
- Sun Dec 09, 2018 8:58 am
- Forum: Naming
- Topic: polydentate ligands
- Replies: 1
- Views: 1630
polydentate ligands
For naming what is the concept of putting "bis" for polydentate ligands?
- Sun Dec 09, 2018 8:57 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelates [ENDORSED]
- Replies: 1
- Views: 410
chelates [ENDORSED]
If we didn't know if it was tridentate or anything, but knew it wasn't bidentate could be put chelate and theoretically get credit?
- Sun Dec 09, 2018 8:56 am
- Forum: Lewis Structures
- Topic: Quantum theory of bonding
- Replies: 1
- Views: 501
Quantum theory of bonding
How can the lewis structure of NO3- be modified according to the quantum theory of bonding?
- Sun Dec 09, 2018 8:54 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: interference [ENDORSED]
- Replies: 1
- Views: 452
interference [ENDORSED]
Under what circumstances would two waves produce destructive interference?
- Sun Dec 09, 2018 8:53 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: The 5th shell [ENDORSED]
- Replies: 1
- Views: 447
The 5th shell [ENDORSED]
How many electrons are required to completely fill the 5th shell?
- Sun Dec 09, 2018 8:51 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: The 5th shell [ENDORSED]
- Replies: 1
- Views: 3473
The 5th shell [ENDORSED]
How many electrons are required to completely fill the 5th shell?
- Sun Dec 09, 2018 8:50 am
- Forum: Sigma & Pi Bonds
- Topic: orbitals
- Replies: 3
- Views: 675
orbitals
Considering the 5th shell of an atom, how many orbitals would it contain?
- Sun Dec 09, 2018 8:49 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg interdeterminism [ENDORSED]
- Replies: 1
- Views: 446
Heisenberg interdeterminism [ENDORSED]
Explain how Heisenberg's uncertainty principle is related to the concept of indeterminism?
- Sun Dec 09, 2018 8:47 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: disassociation
- Replies: 1
- Views: 716
disassociation
How do you determine if a bond disassociates easily?
- Sun Dec 09, 2018 8:46 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: equilibrium constants [ENDORSED]
- Replies: 1
- Views: 870
equilibrium constants [ENDORSED]
How does the equilibrium change with temperature?
- Sun Dec 09, 2018 8:45 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: shifting equilibrium [ENDORSED]
- Replies: 1
- Views: 873
shifting equilibrium [ENDORSED]
How do you know which way the equilibrium will shift?
- Tue Nov 20, 2018 11:57 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles
- Replies: 4
- Views: 384
Bond angles
For the overall picture what does knowing the Bond angle help you with?
- Tue Nov 20, 2018 11:51 am
- Forum: Lewis Structures
- Topic: Electronegativity
- Replies: 4
- Views: 437
Electronegativity
I know you're supposed to always put the most electronegative element as the central atom, but what is the actual reason for this?
- Tue Nov 20, 2018 11:49 am
- Forum: Ionic & Covalent Bonds
- Topic: strength of bonds
- Replies: 1
- Views: 249
strength of bonds
In what scenario would knowing the strength and kj-mol of the bonds be helpful? For example if i know its dipole to dipole, how would knowing its strength in relation to a ion-ion bond help?
- Tue Nov 20, 2018 11:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorization
- Replies: 4
- Views: 429
Memorization
Is molecular shape determination just a matter of memorization of different bonds and lone pairs?
- Tue Nov 20, 2018 11:46 am
- Forum: Hybridization
- Topic: Tips
- Replies: 2
- Views: 361
Tips
Are there any quick ways to remember hybridization in relation to bond number?
- Sun Nov 04, 2018 10:14 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Probability of finding an electron at a certain location
- Replies: 1
- Views: 242
Probability of finding an electron at a certain location
Did he mention if we need to know this for the midterm?
- Tue Oct 30, 2018 9:49 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: 6th edition 3.23
- Replies: 1
- Views: 252
6th edition 3.23
How did they determine that the minimum oxidation number for chlorine was -1?
- Sun Oct 28, 2018 4:20 pm
- Forum: Trends in The Periodic Table
- Topic: Ex 2.93
- Replies: 2
- Views: 235
Ex 2.93
How would start the problem 2.93 in the sixth edition?
- Sun Oct 28, 2018 4:13 pm
- Forum: Trends in The Periodic Table
- Topic: Exceptions to electron configuration
- Replies: 3
- Views: 485
Exceptions to electron configuration
How are the exceptions to electron configuration determined? It explains in the textbook why they set up the configuration in certain elements this way but what differentiates copper and another metal?
- Tue Oct 23, 2018 10:04 am
- Forum: DeBroglie Equation
- Topic: Ex 1.33 6th edition
- Replies: 1
- Views: 207
Ex 1.33 6th edition
For part c it asks you to calculate the wavelength of the energy that was used to eject the electron from the metallic surface. I thought you would just take the energy and plug it into the equation, however, they plugged the energy from part b into the kinetic energy equation. They then used this n...
- Mon Oct 22, 2018 10:28 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Chem Homework 1.45 Question Mistake?
- Replies: 3
- Views: 364
Re: Chem Homework 1.45 Question Mistake?
Lavelle did say that in class, I'm not sure either if there's just two ways to do it or if one way is wrong
- Mon Oct 15, 2018 12:26 am
- Forum: Properties of Light
- Topic: Chapters 1 and 2 logisitcs
- Replies: 3
- Views: 269
Re: Chapters 1 and 2 logisitcs
Hi syd,
The first homework was on fundamentals but now it'll just follow the general outline.
hope that helps ;)
The first homework was on fundamentals but now it'll just follow the general outline.
hope that helps ;)
- Mon Oct 15, 2018 12:24 am
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 16982
Re: Note Taking
The most important thing to me, is not writing every single thing down. Whether you take notes on a laptop or on a notepad, filtering through what is useful and what is not is the most important factor in retaining knowledge.
- Thu Oct 11, 2018 4:14 pm
- Forum: Properties of Electrons
- Topic: bound electrons
- Replies: 2
- Views: 2553
bound electrons
On the board it was stated that a negative sign means bound e- has lower energy than free e-. What is meant by "bound electron" vs "free electron"
- Sat Oct 06, 2018 3:44 pm
- Forum: Limiting Reactant Calculations
- Topic: titrations [ENDORSED]
- Replies: 1
- Views: 265
titrations [ENDORSED]
Will we have to know how to determine the molarity of an acid by titration?
- Sat Oct 06, 2018 3:27 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles [ENDORSED]
- Replies: 6
- Views: 1270
Moles [ENDORSED]
While looking at this equation: Fe2O3(s)+ 3 CO2(g) ------> 2 Fe(s) + 3 CO2(g)
it implies that 2 mol Fe ~ 1 mol Fe2O3
How does this imply that 2 mol of iron equals 1 mol of the compound?
it implies that 2 mol Fe ~ 1 mol Fe2O3
How does this imply that 2 mol of iron equals 1 mol of the compound?
- Tue Oct 02, 2018 10:11 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number
- Replies: 2
- Views: 303
Avogadro's Number
How is it that Carbon became the basis for Avogadro's number? Whenever it's explained, they always take 12 g of carbon to determine Avogadro's number but how is that universally applied?