Search found 108 matches
- Tue Mar 10, 2020 1:37 pm
- Forum: Zero Order Reactions
- Topic: 0 order
- Replies: 14
- Views: 1534
0 order
What would be an applicable example of a 0 order reaction? When would that make sense?
- Tue Mar 10, 2020 1:33 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst vs intermediate
- Replies: 3
- Views: 346
Re: Catalyst vs intermediate
A catalyst is first a reactant and then a product while an intermediate is first a product and then a reactant
- Tue Mar 10, 2020 1:28 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Molecularity
- Replies: 4
- Views: 323
Re: Molecularity
I think we use it to describe how many things have to collide in a reaction.
- Tue Mar 10, 2020 1:27 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Differences between Reaction Mechanisms
- Replies: 1
- Views: 112
Re: Differences between Reaction Mechanisms
Different mechanisms have different slow steps and therefore different rate laws.
- Tue Mar 10, 2020 1:24 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 17
- Views: 977
Re: Activation Energy
I think if it is endothermic and enthalpy tells how much energy or heat input is necessary then that is analogous to activation energy.
- Mon Mar 09, 2020 1:31 pm
- Forum: General Rate Laws
- Topic: integrated rate law vs general
- Replies: 8
- Views: 747
Re: integrated rate law vs general
I think that the general rate law gives you the rate while the integrated rate laws gives the concentration of the reactants.
- Mon Mar 09, 2020 1:24 pm
- Forum: Biological Examples
- Topic: Catalysts
- Replies: 7
- Views: 872
Re: Catalysts
I do not think that O2 is a catalyst, but rather just part of the reaction. The intermediates are NO2 and O, while the only catalyst is NO.
- Mon Mar 09, 2020 1:21 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1445
Re: Who makes the Final
I think that Lavelle makes the entire final, based off of what my TA has said in discussion.
- Mon Mar 09, 2020 1:18 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Steady-State Approach
- Replies: 4
- Views: 315
Re: Steady-State Approach
I do not think that this will be covered at all on the final. I think Lavelle said in class today that we will only use the pre-equilibrium approach.
- Mon Mar 09, 2020 1:17 pm
- Forum: *Enzyme Kinetics
- Topic: Catalyst Practice
- Replies: 3
- Views: 286
Re: Catalyst Practice
I think what was covered in the textbook was helpful!
- Sat Mar 07, 2020 9:41 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: linear plots
- Replies: 7
- Views: 563
Re: linear plots
I think we have to know the axes and what axes would make a linear plot. And probably know the general shape of each graph too.
- Sat Mar 07, 2020 9:40 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: A in the Arrhenius Equation
- Replies: 8
- Views: 550
Re: A in the Arrhenius Equation
Some collisions occur with wrong orientations, so this tells how many occur in the correct orientation for the reaction to occur.
- Sat Mar 07, 2020 9:39 pm
- Forum: General Rate Laws
- Topic: Elementary and overall
- Replies: 2
- Views: 188
Re: Elementary and overall
I think the exponent in the overall rate law is not the same as the coefficient in the equation.
- Mon Mar 02, 2020 2:58 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: G=-nFE
- Replies: 5
- Views: 421
Re: G=-nFE
In this equation, n=the number of electrons transferred in the redox reaction.
- Mon Mar 02, 2020 2:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: test 2
- Replies: 3
- Views: 321
Re: test 2
Yes! That is correct.
- Mon Mar 02, 2020 10:44 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation Layout
- Replies: 7
- Views: 440
Re: Cell Notation Layout
Yes! I found the examples in class and discussion to be helpful about cell notation.
- Mon Mar 02, 2020 10:42 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 7092
Re: Study Advice
I think that Lyndon's review sessions and office hours are good resources!
- Mon Mar 02, 2020 10:39 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: test 2 topics
- Replies: 11
- Views: 773
Re: test 2 topics
Second half of outline 4 and all of outline 5! Does anyone know what the difficulty level is? Is it going to be similar to test 1?
- Mon Mar 02, 2020 10:38 am
- Forum: Administrative Questions and Class Announcements
- Topic: Study guide
- Replies: 7
- Views: 609
Re: Study guide
I don't think there is anything official, but I do know that some ta's are creating worksheets and helpful guidelines for students.
- Mon Mar 02, 2020 10:33 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation commas
- Replies: 4
- Views: 338
Re: Cell Notation commas
For ex, in the chemical equation
-2Fe3+ + Cu -> Cu2+ + 2Fe2+
the cell notation is
Cu(s) / Cu2+(aq) ‖ Fe3+(aq) , Fe2+(aq) / Pt(s)
the comma indicates that Fe3+ is being reduced to Fe2+
-2Fe3+ + Cu -> Cu2+ + 2Fe2+
the cell notation is
Cu(s) / Cu2+(aq) ‖ Fe3+(aq) , Fe2+(aq) / Pt(s)
the comma indicates that Fe3+ is being reduced to Fe2+
- Sun Mar 01, 2020 7:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrodes
- Replies: 5
- Views: 386
Re: electrodes
I think we can use most inert metals. To be safe, I think platinum is most commonly used.
- Sun Feb 23, 2020 12:47 am
- Forum: Balancing Redox Reactions
- Topic: writing redox equations
- Replies: 3
- Views: 222
Re: writing redox equations
I also need help on this! I think it has something to do with the wording of the problem but I am not sure.
- Sun Feb 23, 2020 12:45 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: cell potential
- Replies: 3
- Views: 331
Re: cell potential
Yes! The max potential of a cell is the maximum potential difference between two half reactions in a galvanic cell. I think you can calculate this by manipulating different equations.
- Sun Feb 23, 2020 12:40 am
- Forum: General Science Questions
- Topic: Content on Test 2
- Replies: 10
- Views: 718
Re: Content on Test 2
Test 2 will cover everything from "Understand why reaction free energy depends on pressure and the equilibrium constant" all the way through electrochemistry
- Sun Feb 23, 2020 12:35 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: inert conductor
- Replies: 2
- Views: 183
Re: inert conductor
You need an inert conductor when there is no metal present to conduct the electrons from the anode to the cathode.
- Sun Feb 23, 2020 12:33 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode vs Cathode
- Replies: 6
- Views: 401
Re: Anode vs Cathode
The anode of a device is the terminal where current flows in from outside. The cathode of a device is the terminal where current flows out. I think you just use these terms when you are dealing with a Galvanic cell that converts chemical energy to electric energy.
- Tue Feb 18, 2020 2:28 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Signs for Gibbs Free Energy
- Replies: 11
- Views: 711
Re: Signs for Gibbs Free Energy
When the sign is negative, it means that the reaction is spontaneous. That is because the reaction would result in molecules being in their most stable state which would require less energy to maintain the bonds. As a result, the overall energy is negative because energy is being released. The same ...
- Tue Feb 18, 2020 2:25 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing and Adding together Half-Rxns
- Replies: 6
- Views: 329
Re: Balancing and Adding together Half-Rxns
I think that the electrons have to be balanced because it is part of a redox reaction where two half-reactions are coupled. That means that the same amount of electrons are transferred from one reaction to another and the electrons cannot just be free floating.
- Tue Feb 18, 2020 2:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: relationship between K and temp
- Replies: 2
- Views: 227
Re: relationship between K and temp
I agree with the comment above! In short, an increase in temp means that you are applying more energy, so the products/reactants with the higher energy level would be favored
- Tue Feb 18, 2020 1:49 pm
- Forum: Balancing Redox Reactions
- Topic: Free Electrons?
- Replies: 3
- Views: 195
Re: Free Electrons?
I agree with the previous comment! Reduction reactions are always paired with Oxidation reactions, thus giving the name redox reaction.
- Tue Feb 18, 2020 1:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Nerves
- Replies: 7
- Views: 476
Re: Midterm Nerves
I also felt the same way during the midterm. However, some things that somewhat helped me were listing everything that was given and some variables not given/needed to be solved for. Then, I wrote down multiple equations that involved those variables and used PV=nRT as a gateway to find other variab...
- Sat Feb 08, 2020 4:15 pm
- Forum: Calculating Work of Expansion
- Topic: Integral for work
- Replies: 4
- Views: 164
Re: Integral for work
I don't think you need to directly calculate the work with the integral. Just memorize the equations that are derived from the integral and know when to use each one!
- Sat Feb 08, 2020 4:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: biological examples
- Replies: 2
- Views: 211
Re: biological examples
I am also not sure, but I do know that ATP hydrolysis is an exergonic reaction, which has a negative delta G. Also, Gibbs Free Energy is used in most biochemical reactions because they occur at constant temp and pressure
- Sat Feb 08, 2020 4:05 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Lowest Energy Forms
- Replies: 1
- Views: 68
Re: Lowest Energy Forms
I am also wondering this question! For now, I think I would just memorize it just in case.
- Sat Feb 08, 2020 4:03 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Calculating bond enthalpies
- Replies: 4
- Views: 142
Re: Calculating bond enthalpies
Multiply by 3 if all three bonds are being broken. It definitely will not be a big part of the test, but since we did go over it in lecture we are expected to know how to do it.
- Sat Feb 08, 2020 4:01 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeters
- Replies: 17
- Views: 988
Re: Calorimeters
A bomb calorimeter stays at constant volume! Because of this, there is no work being done to the system.
- Thu Jan 30, 2020 11:59 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Celcius and Kelvin
- Replies: 11
- Views: 452
Re: Celcius and Kelvin
I don't think we have to memorize it, but it would be convenient to memorize it! Also watch out for your units and use either K or C based on the units you want to cancel out.
- Thu Jan 30, 2020 11:55 pm
- Forum: Calculating Work of Expansion
- Topic: ∆H and ∆U
- Replies: 3
- Views: 192
Re: ∆H and ∆U
Delta H is the change in enthalpy while delta U is the change in internal energy in a system. Most of the time, I think you can use them interchangeably in this class.
- Thu Jan 30, 2020 11:49 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated vs Closed [ENDORSED]
- Replies: 34
- Views: 4294
Re: Isolated vs Closed [ENDORSED]
A closed system is a sealed system but energy can be exchanged with the surrounding. On the other hand, an isolated system is completely isolated from the environment and it cannot be affected by the surroundings. That being said, an insulated bottle is an isolated system if we assume that it is com...
- Thu Jan 30, 2020 11:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 8
- Views: 375
Re: Midterm
I think everything we have covered so far, including all of this week's lectures!
- Thu Jan 30, 2020 11:43 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies of Formation
- Replies: 4
- Views: 190
Re: Enthalpies of Formation
I think so, but I am also wondering this question!!
- Wed Jan 22, 2020 11:43 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H20 in the ICE table
- Replies: 26
- Views: 1502
Re: H20 in the ICE table
When filling out and ICE table, only include gases and aqueous molecules. In addition to the comments above, you want to leave our solids because you cannot really condense or expand solids since they are in a fixed state
- Wed Jan 22, 2020 11:40 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy
- Replies: 4
- Views: 356
Re: Enthalpy
Enthalpy is just the measure of heat! Temperature and enthalpy are related but are different, as seen in heat curves. The x-axis is heat supplied and the y-axis is temperature
- Wed Jan 22, 2020 11:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Best Way To Study?
- Replies: 13
- Views: 645
Re: Best Way To Study?
In addition to doing the homework problems in the textbook, I found all of the workshop sessions very helpful :)
- Wed Jan 22, 2020 11:29 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: suggestions
- Replies: 16
- Views: 571
Re: suggestions
After watching the videos that were mentioned in the previous comments, I would recommend trying to find some more practice problems to check your understanding :)
- Wed Jan 22, 2020 11:26 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating K
- Replies: 15
- Views: 763
Re: Calculating K
Always balance the equation! When calculating K, the incorrect coefficients will change the exponents in the equation and you would not calculate the correct equilibrium constant
- Thu Jan 16, 2020 1:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quadratic
- Replies: 6
- Views: 190
Re: Quadratic
Memorizing the quadratic equation would help! Also, it is good to know the shortcut with the 5% rule. if you are dealing with a weak acid and Ka is small, we can use approximation. The cut off is anything smaller than 10^-3
- Thu Jan 16, 2020 1:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K units
- Replies: 10
- Views: 519
Re: K units
K actually measures the activity of the reaction. For this class, I think we omit the units for simplicity
- Thu Jan 16, 2020 1:17 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Kw
- Replies: 16
- Views: 445
Re: Kw
They are the same thing, and Kw=Ka*Kb=10^-14
- Thu Jan 16, 2020 1:12 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: How to make ICE box
- Replies: 17
- Views: 1259
Re: How to make ICE box
To add onto the comments above, make sure you go back to the problem to see what you need to solve for. After you find x, you may need to multiply it by 2 if the concentration you are looking for is 2x
- Thu Jan 16, 2020 1:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units in ICE Table
- Replies: 8
- Views: 250
Re: Units in ICE Table
I think that you can use either molarity or moles. It would definitely be easier to use molarity since that can be easily used in Kc. If you use moles, you would have to convert the values at the end to molarity by dividing by the volume(L)
- Thu Jan 09, 2020 10:42 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Difference between -> and <->
- Replies: 4
- Views: 192
Re: Difference between -> and <->
<-> means that the reaction is at equilibrium so there is a forward reaction and reverse reaction
- Thu Jan 09, 2020 10:40 pm
- Forum: Ideal Gases
- Topic: Adding reactions
- Replies: 4
- Views: 268
Re: Adding reactions
I think that is just part of the formula, but I was also wondering the same thing.
- Thu Jan 09, 2020 3:16 pm
- Forum: Ideal Gases
- Topic: Ideal Gases
- Replies: 3
- Views: 141
Re: Ideal Gases
I am also not sure. From looking at the outline, it looks like we just need to know how to use the equation.
- Thu Jan 09, 2020 3:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pressure
- Replies: 4
- Views: 246
Re: Pressure
Unlike temperature, the change in pressure does not change the equilibrium constant.
- Thu Jan 09, 2020 3:08 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen Bond
- Replies: 2
- Views: 551
Re: Hydrogen Bond
I don't think that there would be a hydrogen bond between water and oxygen gas because the two oxygen atoms are equally electronegative.
- Tue Dec 03, 2019 11:28 pm
- Forum: Naming
- Topic: Memorization
- Replies: 6
- Views: 390
Re: Memorization
I think we need to memorize it and also we should memorize the ligands list that Lavelle sent out in an email.
- Tue Dec 03, 2019 11:25 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: sigma and pi bonds
- Replies: 2
- Views: 272
Re: sigma and pi bonds
Yes, I think that is all we need to know too. Also make sure that you know how to label each bond and know which hybrid/normal orbitals are used.
- Tue Dec 03, 2019 8:37 am
- Forum: Ionic & Covalent Bonds
- Topic: bond lengths
- Replies: 4
- Views: 485
Re: bond lengths
I also do not think that we need to memorize the exact bond lengths. We should at least know the relative bond lengths between single, double and triple bonds and the 1.5 bonds in resonance structures
- Tue Dec 03, 2019 8:35 am
- Forum: Student Social/Study Group
- Topic: Practice Final
- Replies: 17
- Views: 1391
Re: Practice Final
I do not think there is a practice final, but there are a lot of past exam questions that will be helpful. Also, the 7:30 review session will be going over most things that were covered after the midterm so it would be helpful to go to other review sessions to go over the topics that were covered at...
- Tue Dec 03, 2019 8:33 am
- Forum: Bronsted Acids & Bases
- Topic: Defining brosted and lewis
- Replies: 5
- Views: 450
Re: Defining brosted and lewis
Adding to the comments above,
bronsted base: proton acceptor
bronsted acid: proton donor
lewis base: electron pair donor
lewis acid: electron pair acceptor
I would identify them by focusing on what is being transferred or changed in the reaction.
bronsted base: proton acceptor
bronsted acid: proton donor
lewis base: electron pair donor
lewis acid: electron pair acceptor
I would identify them by focusing on what is being transferred or changed in the reaction.
- Tue Dec 03, 2019 8:27 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Homework 6B.5
- Replies: 1
- Views: 154
Re: Homework 6B.5
The first step to solving this problem like this in general is finding the moles of hydrogen which is used through stoichiometry. After finding the moles of hydrogen, you can find the concentration of hydrogen, aka H30+, by using the formula molarity=moles/liter. [HNO3]=[H3O+] is just saying that th...
- Tue Dec 03, 2019 8:16 am
- Forum: Conjugate Acids & Bases
- Topic: 6A.1
- Replies: 6
- Views: 799
Re: 6A.1
You add a hydrogen to the formula and add a +1 to the overall charge of the acid
- Tue Nov 26, 2019 11:57 am
- Forum: Coordinate Covalent Bonds
- Topic: identification
- Replies: 1
- Views: 229
Re: identification
One way is to look for the neutral ligands that are bonded to a central metal atom!
- Tue Nov 26, 2019 11:56 am
- Forum: SI Units, Unit Conversions
- Topic: midterm/final
- Replies: 18
- Views: 1474
Re: midterm/final
I also think it would be calculations and concepts!
- Mon Nov 25, 2019 9:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: complexes
- Replies: 3
- Views: 272
Re: complexes
Yes! I think we should memorize the chart that Lavelle sent out in an email a few days ago
- Mon Nov 25, 2019 9:39 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: OH2 vs H2O
- Replies: 4
- Views: 305
Re: OH2 vs H2O
I don't think you would get marked down, but just make sure that you make it clear that you know that the O is the one being bonded to the central atom!
- Mon Nov 25, 2019 9:38 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Transition Metals
- Replies: 4
- Views: 363
Re: Transition Metals
I think it is only transition metals, but I am not sure as well :0
- Sun Nov 24, 2019 12:25 am
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 7
- Views: 459
Re: Sig Figs
Always make sure you have the right sig figs to be safe :)
- Sun Nov 24, 2019 12:24 am
- Forum: Naming
- Topic: Greek Prefixes
- Replies: 2
- Views: 109
Re: Greek Prefixes
Adding on to the comment above, you use it so that it is not awkward saying didimethyl and it adds clarity
- Thu Nov 21, 2019 4:09 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: in need of test 2 practice problems
- Replies: 5
- Views: 291
Re: in need of test 2 practice problems
I would say to look at all of the homework problems again! That for sure is a good start
- Tue Nov 19, 2019 10:18 am
- Forum: Ionic & Covalent Bonds
- Topic: bond lengths
- Replies: 4
- Views: 485
Re: bond lengths
I don't think we need to memorize bond lengths! Maybe just know that the order of increasing bond lengths is triple<double<single bonds
- Tue Nov 19, 2019 10:15 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Atomic Size & LDF's
- Replies: 2
- Views: 224
Re: Atomic Size & LDF's
To add on to the previous comment, more electrons result in greater electron repulsion, which leads to greater polarizability and greater london dispersion forces
- Thu Nov 14, 2019 11:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.3
- Replies: 3
- Views: 246
Re: 2E.3
To add on to the comment above, the name of the shape of the molecule only depends on the number of atoms attached to the central atoms and the number of lone pairs on the central atom. Single, double and triple bonds are considered the same as "one unit" and lone pairs on outside atoms do...
- Thu Nov 14, 2019 11:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: "Less than" Degrees (HW)
- Replies: 1
- Views: 187
Re: "Less than" Degrees (HW)
I think this is because in order for the molecule to be in the most "stable" state, the lone pairs and attached atoms need to be as far apart as possible, and the lone pairs cause the angles to decrease.
- Tue Nov 12, 2019 10:26 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework for Week 7
- Replies: 5
- Views: 312
Re: Homework for Week 7
As I mentioned in another post, I think we can still do some homework problems from the chemical bonds unit because as of now we have not really learned anything new and it is still good to review material for the final! However it is good to look ahead to see what we will be covering next
- Tue Nov 12, 2019 10:23 am
- Forum: Ionic & Covalent Bonds
- Topic: Homework for week 7
- Replies: 5
- Views: 389
Re: Homework for week 7
I think so! As of now we haven't really learned anything new and it is still good to review past material for the final
- Tue Nov 12, 2019 10:20 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Forces
- Replies: 3
- Views: 111
Re: Forces
I think this is because of electron repulsion!
- Thu Nov 07, 2019 5:24 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: central atom
- Replies: 21
- Views: 1031
Re: central atom
yes! I think that it is better to have the charge on the most electronegative atom, such as oxygen
- Thu Nov 07, 2019 11:52 am
- Forum: Trends in The Periodic Table
- Topic: ionic radii
- Replies: 4
- Views: 260
Re: ionic radii
In addition to the comments above, the atomic radii decreases as you move towards the right of a period. This is because as you move right, the added electrons are added to the same n level but the number of protons in the nucleus increases. The protons have a much greater effect than the added elec...
- Thu Nov 07, 2019 11:48 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Comparing forces of attraction
- Replies: 4
- Views: 248
Re: Comparing forces of attraction
Hydrogen bonds are strong intermolecular forces created when a hydrogen atom bonded to an electronegative atom approaches a nearby electronegative atom, and greater electronegativity of the hydrogen bond acceptor will lead to an increase in hydrogen-bond strength. I think it is because the charge of...
- Thu Nov 07, 2019 11:18 am
- Forum: Octet Exceptions
- Topic: General principles of octet exception
- Replies: 7
- Views: 342
Re: General principles of octet exception
I think that everything in row 3+ can have an expanded octet, and elements such as Aluminum does not have to have an octet.
- Thu Nov 07, 2019 11:15 am
- Forum: Lewis Structures
- Topic: Lewis acids and bases?
- Replies: 7
- Views: 410
Re: Lewis acids and bases?
I believe so! I do know that we will be going over more acids and bases towards the end of the quarter
- Thu Oct 31, 2019 2:57 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge equation
- Replies: 9
- Views: 253
Re: Formal Charge equation
hello! the equation for formal charge may be confusing, so my TA told us that you do not have to memorize it. I think you can calculate it using the number of valence electrons from the periodic table and the number of shared electrons in the lewis structure
- Thu Oct 31, 2019 2:54 pm
- Forum: Lewis Structures
- Topic: lewis structures
- Replies: 4
- Views: 177
Re: lewis structures
I think that there would be one correct answers since some lewis structure could be drawn based on different orientations. However, there are some structures that are more stable than others due to formal charge so I think that there will be partial credit if you do not draw the most stable structure.
- Thu Oct 31, 2019 2:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Posts
- Replies: 3
- Views: 164
Re: Posts
I believe the replies count as posts!
- Thu Oct 31, 2019 2:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
- Replies: 52
- Views: 6763
Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Do you think that the practice problems on the dino nuggets worksheet are about the same difficulty as the problems that would be on the midterm?
- Mon Oct 28, 2019 8:37 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm
- Replies: 28
- Views: 1320
Re: Midterm
I was wondering the same question. That is what I think also but I am not sure
- Thu Oct 24, 2019 10:34 am
- Forum: Trends in The Periodic Table
- Topic: Location of elements
- Replies: 12
- Views: 719
Re: Location of elements
I think it would be helpful, but make sure to know where all of the common elements are so they are easier to find on the periodic table!
- Thu Oct 24, 2019 10:27 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 13
- Views: 2965
Re: Electron Configurations
Hi, can someone please further explain the exception for the electron configuration for 3d and 4s? especially for the elements Cr and Cu?
Thank you!
Thank you!
- Thu Oct 24, 2019 10:23 am
- Forum: Trends in The Periodic Table
- Topic: Summary of Periodic Trends
- Replies: 7
- Views: 409
Re: Summary of Periodic Trends
Can someone please explain why ionization energy increases as you move from left to right on the periodic table?
- Thu Oct 24, 2019 10:17 am
- Forum: Ionic & Covalent Bonds
- Topic: Properties of Metals/Nonmetals/Metalloids
- Replies: 3
- Views: 221
Re: Properties of Metals/Nonmetals/Metalloids
In addition to the other responds, nonmetals have high ionization energies. They are generally poor conductors of heat and electricity. Solid nonmetals are generally brittle, with little or no metallic luster, and most nonmetals have the ability to gain electrons easily
- Thu Oct 24, 2019 10:12 am
- Forum: Properties of Light
- Topic: Midterm
- Replies: 4
- Views: 316
Re: Midterm
Yes! Dr. Lavelle mentioned it and I believe sometime soon he will let us know when the review sessions are
- Fri Oct 18, 2019 11:41 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3505
Re: Best Way To Study?
First, I like to go through practice problems and make a list of topics I am confused about. Sometimes I also rewrite my notes from lecture and try to explain it to others since it helps to talk through it out loud.
- Fri Oct 18, 2019 11:22 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592729
Re: Post All Chemistry Jokes Here
Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
A: If you can't helium, and you can't curium, then you might as well barium.
- Wed Oct 16, 2019 1:45 pm
- Forum: Properties of Light
- Topic: Constant for Speed of Light
- Replies: 14
- Views: 609
Re: Constant for Speed of Light
I would use 2.998*10^8 m*s-1 because it would give you a more exact answer, but maybe ask your TA!
- Wed Oct 16, 2019 1:42 pm
- Forum: Properties of Electrons
- Topic: Orbitals and Lobes
- Replies: 3
- Views: 136
Re: Orbitals and Lobes
I think that an orbital is the probability description of where an electron can be found, and the four basic types of orbitals are designated as s, p, d, and f. To my understanding, lobes are more specific areas within the orbitals in which there is a high probability of finding an electron.
- Wed Oct 16, 2019 1:36 pm
- Forum: General Science Questions
- Topic: Salt Water: Mixture or Compound?
- Replies: 4
- Views: 666
Re: Salt Water: Mixture or Compound?
I think salt water is a mixture because it is made up of different compounds/elements (salt and water).
- Fri Oct 11, 2019 4:06 pm
- Forum: Significant Figures
- Topic: for test 1
- Replies: 3
- Views: 309
Re: for test 1
There might be some points marked off, but I believe there is still partial credit! And as long as you are aware of it for the next test, you should be fine
- Fri Oct 11, 2019 3:58 pm
- Forum: Student Social/Study Group
- Topic: Best Sessions
- Replies: 12
- Views: 474
Re: Best Sessions
In addition to the sessions in covel, I recommend going over the lecture videos and trying to reexplain the lecture to someone else in your own words