## Search found 74 matches

Wed Mar 13, 2019 2:56 am
Forum: Calculating Work of Expansion
Topic: Reversible vs irreversible
Replies: 6
Views: 360

### Re: Reversible vs irreversible

Will reversible expansion always do more work?
Tue Mar 12, 2019 1:31 am
Forum: Calculating Work of Expansion
Topic: Reversible Expansion
Replies: 1
Views: 203

### Reversible Expansion

If a system is at equilibrium does that mean it is reversible? If so, in what ways is it reversible?
Mon Mar 11, 2019 10:32 pm
Forum: Second Order Reactions
Topic: Homework, 6th edition, 15.35
Replies: 3
Views: 113

### Homework, 6th edition, 15.35

Hi, I was wondering how I would use the second-order reaction (after I found k by using the half-life equation)?
Mon Mar 11, 2019 9:54 pm
Forum: First Order Reactions
Topic: Homework, 6th edition, 15.27
Replies: 2
Views: 71

### Homework, 6th edition, 15.27

Hi, can someone help me figure out how to do part c and d?
Sun Mar 10, 2019 10:38 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Unique Rate of a Reaction
Replies: 2
Views: 85

### Re: Unique Rate of a Reaction

What value would you use for O2 when writing the unique reaction rate?
Wed Mar 06, 2019 1:29 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework 6th edition, 15.17
Replies: 3
Views: 106

### Re: Homework 6th edition, 15.17

Also, how can I show that the concentration of C is independent of the rate.
Wed Mar 06, 2019 1:28 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework 6th edition, 15.17
Replies: 3
Views: 106

### Homework 6th edition, 15.17

What does it mean for the concentration of C do be independent of the rate? How
Tue Mar 05, 2019 11:59 pm
Forum: General Rate Laws
Topic: Reaction Order
Replies: 4
Views: 136

### Reaction Order

How does the reaction order affect the units of rate laws?
Thu Feb 28, 2019 1:30 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic and Endothermic Reactions
Replies: 4
Views: 371

### Exothermic and Endothermic Reactions

Why does increasing the temperature of an exothermic reaction favor reactions and an endothermic reaction favor the products?
Wed Feb 27, 2019 7:33 pm
Forum: Balancing Redox Reactions
Topic: Aq to Aq or S to Aq (14.13d) [ENDORSED]
Replies: 2
Views: 107

### Re: Aq to Aq or S to Aq (14.13d)[ENDORSED]

So you can use Au(s) -> Au3+ 3e- as a half-reaction, even though both of these species are on the product side?
Wed Feb 27, 2019 6:33 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Cell Potential [ENDORSED]
Replies: 2
Views: 73

### Standard Cell Potential[ENDORSED]

What does the standard cell potential qualitatively tell us?
Wed Feb 27, 2019 12:52 am
Forum: Balancing Redox Reactions
Topic: Oxidizing and Reducing Agent
Replies: 4
Views: 112

### Re: Oxidizing and Reducing Agent

fgalasso1b wrote:Yes, it's called a disproportionation reaction (when an element is both being oxidized and reduced).

Will this be included in Test 2?
Wed Feb 27, 2019 12:52 am
Forum: Balancing Redox Reactions
Topic: Homework 6th edition, 14.5, part d
Replies: 1
Views: 69

### Homework 6th edition, 14.5, part d

I am getting confused with when species can act both as oxidizing and reducing agents. What are the general guidelines when dealing with species acting as both in basic solutions?
Tue Feb 26, 2019 3:08 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing and Reducing Agent
Replies: 4
Views: 112

### Oxidizing and Reducing Agent

How can a species act as both an oxidizing and reducing agent?
Tue Feb 26, 2019 2:50 pm
Forum: Balancing Redox Reactions
Topic: Balancing Rules for Redox Reactions
Replies: 3
Views: 107

### Balancing Rules for Redox Reactions

What are some general guidelines or rules to follow when balancing redox reactions?
Tue Feb 26, 2019 2:04 am
Forum: Balancing Redox Reactions
Topic: Homework Question: 6th edition, 14.1
Replies: 1
Views: 63

### Homework Question: 6th edition, 14.1

Can someone help with balancing the redox equation?
Wed Feb 13, 2019 3:27 pm
Forum: Calculating Work of Expansion
Topic: Reversible Expansion
Replies: 2
Views: 102

### Reversible Expansion

How/why does reversible expansion do the most work?
Tue Feb 12, 2019 1:12 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Irreversible and Reversible Expansion
Replies: 2
Views: 78

### Irreversible and Reversible Expansion

How does irreversible and reversible expansion work? What is happening conceptually with the gas and when is pressure constant?
Sat Feb 09, 2019 3:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework: 6h edition, 12.55
Replies: 1
Views: 82

### Homework: 6h edition, 12.55

I am not sure how to answer the last question,
e.) Explain any differences in pH on the basis of molecular structure.
Sat Feb 09, 2019 12:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant for Autoprotolysis of Water
Replies: 1
Views: 71

### Re: Equilibrium Constant for Autoprotolysis of Water

In the lecture notes, there was an example where: given .030 M of Ba(OH)2 at 25 C, what are the molarities of H30+ and OH-? After finding the concentration of OH- we were able to find the molarity of H30+ by dividing the Kw (1.0x10^-14) by the concentration of OH- (.060).
Sat Feb 09, 2019 11:57 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant for Autoprotolysis of Water
Replies: 1
Views: 71

### Equilibrium Constant for Autoprotolysis of Water

In what situations can we use the equilibrium constant for the autoprotolysis of water? For example, can we assume the application of the constant for strong acids and bases?
Wed Feb 06, 2019 11:47 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Processes
Replies: 4
Views: 159

### Re: Reversible Processes

How does having a non-constant/constant pressure affect the way in which a gas reversibly or irreversibly expands? I am just confused conceptually with how pressure affects the gas.
Wed Jan 30, 2019 8:04 pm
Forum: Calculating Work of Expansion
Topic: Reversible Expansion
Replies: 3
Views: 101

### Reversible Expansion

What exactly is reversible expansion? Also, how would you calculate the work of a gas that is reversibly expanding?
Wed Jan 30, 2019 8:02 pm
Forum: Calculating Work of Expansion
Topic: 6th edition, 8.9
Replies: 1
Views: 60

### Re: 6th edition, 8.9

The internal energy (U) = heat + work (q+w). You would have to use the work equation (w=-P(deltaV)). So you would have to change the pressure from torr to atm and then find the change in volume from the given information. After getting the value of work, you would have to change that to Joules so us...
Mon Jan 28, 2019 1:17 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 3
Views: 71

### Heat Capacity

What does heat capacity exactly tell us qualitatively?
Sun Jan 27, 2019 12:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: The 3 methods
Replies: 5
Views: 144

### Re: The 3 methods

Can someone clarify how to use bond enthalpy to calculate the enthalpy change?
Wed Jan 23, 2019 1:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework: 12.63, 6th edition
Replies: 2
Views: 110

### Homework: 12.63, 6th edition

I am not really too sure how to solve this problem? Does anyone have any suggestions?
Tue Jan 22, 2019 2:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka and Kb
Replies: 3
Views: 96

### Ka and Kb

How can we tell from Ka and Kb that the acid/base is strong or weak?
Sun Jan 20, 2019 7:19 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in Temperature
Replies: 8
Views: 503

### Changes in Temperature

How does endothermic and exothermic reactions affect the way a reaction will shift to (which side does it favor)?
Sun Jan 20, 2019 7:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium and Volume
Replies: 2
Views: 78

### Equilibrium and Volume

How does equilibrium change when there are changes in volume?
Sun Jan 20, 2019 7:13 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 10
Views: 309

### Q and K

When comparing Q and K, what does that exactly tell us?
Tue Jan 08, 2019 11:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants Involving Spectator Ions
Replies: 2
Views: 34

### Equilibrium Constants Involving Spectator Ions

What are spectator ions and why are they not included when writing the equilibrium expression?
Tue Jan 08, 2019 11:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants for Gases
Replies: 1
Views: 63

### Equilibrium Constants for Gases

Will increasing the pressure for gases affect the equilibrium constant?
Tue Jan 08, 2019 11:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants for Gases
Replies: 1
Views: 76

### Equilibrium Constants for Gases

Will increasing the pressure for gases affect the equilibrium constant?
Tue Jan 08, 2019 11:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Partial Pressure of Gas
Replies: 1
Views: 33

### Equilibrium Partial Pressure of Gas

Can someone explain how the equilibrium partial pressure of gases makes K unitless?
Sat Dec 08, 2018 4:27 pm
Forum: Lewis Acids & Bases
Topic: Amphiprotic vs. Amphoteric
Replies: 1
Views: 56

### Amphiprotic vs. Amphoteric

How can we tell if acids or bases are amphiprotic and/or amphoteric?
Sat Dec 08, 2018 1:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 7
Views: 297

### Polarity

What does it mean to have polar bonds?
Sat Dec 08, 2018 1:12 am
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 5
Views: 305

### Bond Lengths

How are bond lengths the same due to resonance structures?
Fri Dec 07, 2018 11:36 pm
Forum: Properties of Light
Replies: 2
Views: 341

Why is that higher wavelengths travel faster in comparison to smaller wavelengths?
Thu Dec 06, 2018 1:16 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acid/Base
Replies: 3
Views: 121

### Conjugate Acid/Base

What exactly is a conjugate acid and base?
Thu Dec 06, 2018 1:10 pm
Forum: Naming
Topic: Naming Metals
Replies: 2
Views: 62

### Re: Naming Metals

I believe that it is just a naming convention that we have to follow. For any negatively charged complex, we would have to add -ate to the metal.
Thu Dec 06, 2018 1:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to tell if something is a chelate
Replies: 6
Views: 205

### Re: How to tell if something is a chelate

To tell if something is a chelate, I believe you would look at how the ligand has two binding sites to the transition metal.
Sun Dec 02, 2018 10:48 pm
Forum: Conjugate Acids & Bases
Topic: Clarification of Conjugate Acids and Bases
Replies: 4
Views: 161

### Clarification of Conjugate Acids and Bases

What is exactly a conjugate acid and base? What role does it play in a chemical equilibrium equation?
Mon Nov 26, 2018 2:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 9
Replies: 3
Views: 171

### Homework 9

For this week's homework, are we basing it off of outline 5?
Mon Nov 26, 2018 2:25 pm
Forum: Hybridization
Topic: Bond Angles and Hybridization
Replies: 2
Views: 56

### Bond Angles and Hybridization

Why does the bond angle between two hybrid orbitals increase as the s-character of the hybrids is increased? (This question was from 4.43, 6th edition)
Mon Nov 19, 2018 6:38 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and pi bonds
Replies: 2
Views: 97

### Re: Sigma and pi bonds

Is there a difference in strength between a sigma bond and pi bonds?
Mon Nov 19, 2018 6:35 pm
Forum: Hybridization
Topic: D-orbital
Replies: 5
Views: 177

### D-orbital

What is the correct notation when including a d orbital into hybridization? In lecture, for example, I believe d^2sp^3 was used as an example. Can we still put the d orbital after sp?
Mon Nov 19, 2018 6:33 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds [ENDORSED]
Replies: 12
Views: 340

### Re: Sigma and Pi Bonds[ENDORSED]

Meigan Wu 3I wrote:Also, sigma bonds are made from hybridized orbitals and pi bonds are made from unhybridized orbitals.

What happens when a d orbital is involved in hybridization? Does that affect the shape in any way?
Fri Nov 16, 2018 11:10 am
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 4
Views: 160

### Re: Sigma and Pi bonds

What are the purposes of sigma and pi bonds? Do they just create a bigger area for electron movement?
Fri Nov 16, 2018 11:08 am
Forum: Hybridization
Topic: How to Determine
Replies: 12
Views: 403

### Re: How to Determine

Does this lead to the formation of pi and sigma bonds?
Fri Nov 16, 2018 11:04 am
Forum: Hybridization
Topic: How to Determine
Replies: 12
Views: 403

### Re: How to Determine

Soyoung Park 1H wrote:Does hybridization relate to AX2 and AX3? What do these mean??

I believe those are notations related to the VSEPR formula.
Sun Nov 11, 2018 4:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 7
Views: 177

### Re: Lone Pairs

When creating the VSPER model, do the bonds or lone pairs take take precedence over the other?
Sun Nov 11, 2018 1:49 pm
Forum: Ionic & Covalent Bonds
Topic: Lattice Energy
Replies: 2
Views: 114

### Lattice Energy

Can someone clarify lattice energy?
Sun Nov 11, 2018 1:46 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 4
Views: 157

### Re: Polarizability

Is there a trend based on the size of an atom that correlates to its polarizability/polarizing power?
Sun Nov 11, 2018 1:41 pm
Forum: Ionic & Covalent Bonds
Topic: Metallic Bond
Replies: 7
Views: 193

### Metallic Bond

What exactly is a metallic bond?
Sun Nov 04, 2018 3:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW 1.15, 6th edition
Replies: 1
Views: 213

### HW 1.15, 6th edition

"In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line." Hi, I am not sure how to solve for the initial and final energ...
Sun Nov 04, 2018 1:54 pm
Forum: Lewis Structures
Topic: Lewis Structures for the Midterm
Replies: 1
Views: 71

### Lewis Structures for the Midterm

Will we be expected to know how to draw complex compounds for the midterm (e.g., H2C(NH2)COOH, aka Glycine)? This specific compound showed up on 3.41 from the 6th edition?
Sun Nov 04, 2018 1:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal planes
Replies: 6
Views: 442

### Re: Nodal planes

What exactly is a nodal plane?
Sun Nov 04, 2018 1:44 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Electron Affinity
Replies: 1
Views: 60

### Exceptions to Electron Affinity

Hi, I was wondering what were the exceptions to electron affinity that we had to know?
Sun Nov 04, 2018 1:42 pm
Forum: SI Units, Unit Conversions
Topic: Significant Figures during Multiple Step Calculations
Replies: 2
Views: 289

### Significant Figures during Multiple Step Calculations

Hi, I was wondering if we keep all of our digits during multiple step calculations, and then we actually apply significant figures at the very end?
Wed Oct 31, 2018 8:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configurations involving f-orbital
Replies: 1
Views: 55

### Configurations involving f-orbital

Can someone give an example of an electron configuration involving the f-orbital? I am confused when we start to use this orbital in terms of the configuration.
Sun Oct 28, 2018 3:56 pm
Forum: Student Social/Study Group
Topic: Studying for tests/midterm
Replies: 18
Views: 1339

### Re: Studying for tests/midterm

I recommend also going to the peer learning sessions in which the UA has worksheets to prepare for the test. If you can't make it to those ones, I believe they post it on chemistry community, so you can try using those worksheets for practice as well.
Sun Oct 28, 2018 3:54 pm
Forum: Student Social/Study Group
Topic: Winter quarter scheduling
Replies: 6
Views: 541

### Re: Winter quarter scheduling

I suggest talking to your counselor as well, but I did have a friend who did take them simultaneously and said it was manageable for the most part. She said some topics overlap. However, overall I think it depends on you.
Sun Oct 28, 2018 3:50 pm
Forum: Ionic & Covalent Bonds
Topic: Chemical Bonding and Periodic Trends
Replies: 4
Views: 129

### Re: Chemical Bonding and Periodic Trends

Do transition elements act differently in terms of the periodic trends?
Sun Oct 28, 2018 3:43 pm
Forum: Ionic & Covalent Bonds
Topic: Lowest Ionization Energy [ENDORSED]
Replies: 7
Views: 269

### Re: Lowest Ionization Energy[ENDORSED]

Are there other exceptions to ionization energy (e.g., hydrogen)?
Sun Oct 21, 2018 7:13 pm
Forum: Trends in The Periodic Table
Topic: Homework
Replies: 10
Views: 305

### Re: Homework

Does anyone know when we are suppose to do problems from chapter 2?
Fri Oct 19, 2018 7:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: Lyman, Balmer, Pascal
Replies: 10
Views: 617

### Re: Lyman, Balmer, Pascal

For clarification, would this just show a change in energy levels of the electron?
Fri Oct 19, 2018 7:50 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum number M [ENDORSED]
Replies: 7
Views: 286

### Re: Quantum number M[ENDORSED]

Can anyone clarify the meaning/concept of quantum number m?
Sat Oct 13, 2018 6:30 pm
Forum: Properties of Electrons
Topic: Wavelength Properties
Replies: 4
Views: 106

### Re: Wavelength Properties

sonalivij wrote:Objects larger than that typically don't have wavelike properties because their momentum and mass are far too large.

Also to elaborate, from the lecture, "All matter has wavelike properties but only noticed for moving objects with extremely small mass (like e-)"
Sat Oct 13, 2018 6:28 pm
Forum: Properties of Electrons
Topic: Rydberg constant
Replies: 7
Views: 318

### Rydberg constant

Does anyone know when to use the Rydberg constant?
Sat Oct 13, 2018 6:20 pm
Forum: Properties of Light
Topic: De Brogile Equation
Replies: 6
Views: 81

### De Brogile Equation

Can someone clarify the concept of the De Brogile equation?
Thu Oct 04, 2018 8:38 pm
Forum: Significant Figures
Topic: Decimal point
Replies: 14
Views: 409

### Re: Decimal point

For these types of values involving leading zeros behind a decimal, (e.g., .041), would you disregard the 0 as a significant figure?
Tue Oct 02, 2018 6:03 pm
Forum: SI Units, Unit Conversions
Topic: Audio-Visual Focus-Topics, Assessments & Surveys
Replies: 10
Views: 433

### Re: Audio-Visual Focus-Topics, Assessments & Surveys

jonathanjchang3H wrote:I'm pretty sure the Audio-Visual Focus-Topics, Assessments & Surveys do not affect our grades. They're just supplemental questions and videos to assist with the coursework.

Yea, its no way linked to our grades, and I believe that you appear anonymous when you do the modules.
Sat Sep 29, 2018 6:29 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 80
Views: 3345