## Search found 59 matches

Sun Mar 17, 2019 9:14 am
Forum: Ideal Gases
Topic: non gases
Replies: 3
Views: 304

### 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: 948

### 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: 373

### 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: 275

### 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: 270

### 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: 435

### 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: 326

### 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: 3
Views: 295

### 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: 22
Views: 669

### 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: 62

### 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: 116

### 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: 118

### 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: 208

### 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: 126

### 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: 140

### 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: 96

### 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)
Replies: 6
Views: 701

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: 150

### 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: 352

### 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: 297

### 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: 412

### 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: 89

### 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: 255

### 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: 96

### 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: 132

### 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: 140

### 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: 88

### 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: 288

### 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: 211

### 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: 145

### 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: 1393

### 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: 261

### 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: 288

### 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: 328

### 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: 297

### 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: 292

### 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: 452

### 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: 380

### 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: 310

### 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: 514

### 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: 307

### 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: 316

### 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: 144

### 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: 205

### 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: 105

### 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: 168

### 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: 150

### 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: 129

### 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: 116

### 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: 126

### 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: 249

### 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: 103

### 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: 217

### 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: 135

### 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 ;)
Mon Oct 15, 2018 12:24 am
Forum: Student Social/Study Group
Topic: Note Taking
Replies: 32
Views: 2501

### 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: 556

### 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: 148

### 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: 765

### 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?
Tue Oct 02, 2018 10:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions