Search found 74 matches
- Wed Mar 13, 2019 2:56 am
- Forum: Calculating Work of Expansion
- Topic: Reversible vs irreversible
- Replies: 6
- Views: 878
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: 403
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: 398
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: 332
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: 308
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: 363
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: 363
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: 502
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: 875
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: 286
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: 317
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: 397
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: 214
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: 397
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: 343
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: 223
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: 319
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: 248
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: 222
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.
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: 294
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: 294
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: 507
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: 341
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: 188
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: 190
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: 498
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: 323
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: 223
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: 1118
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: 131
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: 786
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: 120
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: 148
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: 225
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: 85
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: 178
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: 680
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: 608
Bond Lengths
How are bond lengths the same due to resonance structures?
- Fri Dec 07, 2018 11:36 pm
- Forum: Properties of Light
- Topic: Electromagnetic Radiation and Speed
- Replies: 2
- Views: 655
Electromagnetic Radiation and Speed
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: 420
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: 162
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: 584
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: 547
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: 389
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: 357
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: 322
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: 463
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: 1050
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: 699
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: 1087
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: 1087
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: 709
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: 268
Lattice Energy
Can someone clarify lattice energy?
- Sun Nov 11, 2018 1:46 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 4
- Views: 474
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: 658
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: 424
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: 138
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: 1293
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: 219
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: 511
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: 183
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: 2691
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: 1013
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: 364
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: 729
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: 706
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: 1411
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: 791
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: 289
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: 814
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: 318
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: 847
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: 16
- Views: 1555
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: 8259
Re: Reading for Class
Hi Cecilia, for the readings for Chem, I am reading based on what the lectures are going to be about. For example, you can look at the lecture outlines he provided online. I am guessing that the lecture outline #1 is for week one and so on. The lecture outlines also have the chapters that are found...