Search found 101 matches
- Wed Mar 11, 2020 6:30 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Fast Step/Slow Step
- Replies: 7
- Views: 448
Re: Fast Step/Slow Step
How do you determine which step is fast/slow?
- Wed Mar 11, 2020 6:29 pm
- Forum: General Science Questions
- Topic: Chemistry Final
- Replies: 16
- Views: 1142
Re: Chemistry Final
Because many of the review sessions had to be canceled, what else are you guys doing to study?
- Wed Mar 11, 2020 6:27 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Calculating Gibbs Free Energy
- Replies: 6
- Views: 413
Re: Calculating Gibbs Free Energy
In what situation would S(total) ever be = 0? S can only be 0 for a molecule at 0K which is theoretically unacheivable. If is is 0 between reactants and products in a reaction, that is because they had the same entropy value with opposite signs (coincidence) I just wanted to clarify to make sure I ...
- Wed Mar 11, 2020 6:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 957
Re: Reaction Direction
What is the reaction quotient, Q? Can you determine it by concentration values or K?
- Wed Mar 11, 2020 6:14 pm
- Forum: Balancing Redox Reactions
- Topic: Half rxns
- Replies: 27
- Views: 1358
Re: Half rxns
Do you always add the H2O at opposite ends of where you have added OH or H+?
- Wed Mar 11, 2020 5:47 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Autoprolysis
- Replies: 9
- Views: 646
Re: Autoprolysis
Does autoprotolysis have to do with the donation acceptance of a hydrogen ion but amphiprotic means donation and accepting of protons, and so do acids and bases take place in amphiprotic processes?
- Wed Mar 11, 2020 5:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6N.15
- Replies: 2
- Views: 246
Re: 6N.15
What role do the spectator ions play in this reaction?
- Wed Mar 11, 2020 5:41 pm
- Forum: Ideal Gases
- Topic: Acids and Basis: Salts
- Replies: 9
- Views: 612
Re: Acids and Basis: Salts
When using an ICE Table, can you ever have a starting value of products, or is it always 0?
- Wed Mar 11, 2020 5:40 pm
- Forum: General Rate Laws
- Topic: intermediates
- Replies: 12
- Views: 696
Re: intermediates
Was O2 a catalyst or an intermediate in this example?
- Wed Mar 11, 2020 5:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle of Single Electron of A Free Radical
- Replies: 4
- Views: 1062
Re: Bond Angle of Single Electron of A Free Radical
How do you know if you have a radical molecule?
- Wed Mar 11, 2020 5:36 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Reaction Pathways
- Replies: 6
- Views: 420
Re: Catalysts and Reaction Pathways
Besides adding a catalyst, can increasing the temperature, increasing pressure, or decreasing volume speed up a reaction with the large activation energy?
- Wed Mar 11, 2020 5:35 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Reaction Pathways
- Replies: 6
- Views: 420
Re: Catalysts and Reaction Pathways
Besides adding a catalyst, how else can you lower activation energy?
- Wed Mar 11, 2020 5:32 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Pre-Equilibrium Approach
- Replies: 2
- Views: 244
Re: Pre-Equilibrium Approach
I also, have a question on this topic. Will we need to come up with each step or will each step be given?
- Wed Mar 11, 2020 5:30 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Activation Energy
- Replies: 9
- Views: 1449
Re: Activation Energy
Alternatively, when the products are at a higher point than the reactants then it is an exergonic reaction, but a large activation energy will mean that the reaction might be slower because the reaction requires more energy for the reaction to take place.
- Wed Mar 11, 2020 4:46 pm
- Forum: First Order Reactions
- Topic: Determining Order
- Replies: 7
- Views: 442
Re: Determining Order
Does the larger the order mean that the more collisions will occur?
- Wed Mar 11, 2020 4:43 pm
- Forum: General Rate Laws
- Topic: Rate of Formation vs Unique Rate
- Replies: 4
- Views: 438
Re: Rate of Formation vs Unique Rate
How do you determine the rate of formation?
- Sun Mar 08, 2020 1:20 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Electromotive force (emf)
- Replies: 9
- Views: 610
Re: Electromotive force (emf)
Why do we measure the voltage difference of two cells?
- Sun Mar 08, 2020 1:18 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Electromotive force (emf)
- Replies: 9
- Views: 610
Re: Electromotive force (emf)
How do you calculate for EMF?
- Sun Mar 08, 2020 1:17 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1537
Re: Cathode and Anode
Is the left side is the anode that dissolves, what happens to the right side (cathode)?
- Sun Mar 08, 2020 1:16 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams: single vertical line between two solids
- Replies: 5
- Views: 373
Re: Cell Diagrams: single vertical line between two solids
What is a salt reaction?
- Sun Mar 08, 2020 1:15 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Calculating Gibbs Free Energy
- Replies: 6
- Views: 413
Re: Calculating Gibbs Free Energy
In what situation would S(total) ever be = 0?
- Sun Mar 08, 2020 1:14 pm
- Forum: Balancing Redox Reactions
- Topic: Half rxns
- Replies: 27
- Views: 1358
Re: Half rxns
At what point do you add elections to the half reaction?
- Sun Mar 08, 2020 1:11 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: change in gibbs free energy
- Replies: 4
- Views: 322
Re: change in gibbs free energy
What does it mean when a reaction is spontaneous?
- Sun Mar 08, 2020 1:11 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: change in gibbs free energy
- Replies: 4
- Views: 322
Re: change in gibbs free energy
How do you know if you have -deltaG or G>0
- Sun Mar 08, 2020 1:09 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1537
Re: Cathode and Anode
What does the cathode and the anode do?
- Sun Mar 08, 2020 1:08 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free energy of formation
- Replies: 2
- Views: 275
Re: Gibbs free energy of formation
How do you know if you are dealing with a pure substance?
- Tue Feb 11, 2020 9:34 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy change in constant pressure, and constant volume
- Replies: 3
- Views: 6420
Re: Entropy change in constant pressure, and constant volume
In what situation would you only use the R constant, 8.314 instead of multiplying the constant with a fraction?
- Tue Feb 11, 2020 9:31 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy change in constant pressure, and constant volume
- Replies: 3
- Views: 6420
Re: Entropy change in constant pressure, and constant volume
Why does R need to be multiplied by 3/2 for constant volume and 5/2 for constant pressure?
- Tue Feb 04, 2020 9:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work and ideal gas law
- Replies: 4
- Views: 124
Re: Work and ideal gas law
How do I know when I need to use the ideal gas law?
- Tue Feb 04, 2020 9:28 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: state functions
- Replies: 10
- Views: 329
Re: state functions
In 4B. 9 there is a situation where no energy is transferred as heat, what does this mean if delta U = work function?
- Tue Feb 04, 2020 9:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 957
Re: Reaction Direction
I know that K represents the equilibrium constant, but what does Q represent in this situation? In this situation, Q would represent the state of the reaction at a point where equilibrium has not been reached yet. This is why they are asking about which direction the reaction will occur ("left...
- Tue Feb 04, 2020 9:11 pm
- 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: Ideal Gas Constant Hw 4B.5
- Replies: 2
- Views: 113
Ideal Gas Constant Hw 4B.5
How do o convert my work function -1.48125 L•atm into Juoles. I was thinking about using an ideal gas constant but I don’t have K/mol units that will cancel out so that I am left with juoles.
- Tue Feb 04, 2020 1:21 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: -w = q
- Replies: 5
- Views: 282
Re: -w = q
What is the units for temperature that we use in these problems?
- Tue Feb 04, 2020 1:20 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Change in Internal Energy
- Replies: 6
- Views: 4505
Re: Change in Internal Energy
will we ever need to do any conversions for units? do these problems always need to be in kJ?
- Wed Jan 29, 2020 12:01 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 4A. 13 Homework
- Replies: 2
- Views: 79
4A. 13 Homework
Can someone please explain why the answer to this problem is negative instead of positive?
- Tue Jan 28, 2020 9:32 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Heat Supplied to a system
- Replies: 6
- Views: 431
Re: Heat Supplied to a system
Are Cs and Cm both constants? Can I chose to use Kelvin or Celcius or do I need to use a certain unit unit of measurement in the measurement for specific head of the heat equation.
- Tue Jan 28, 2020 12:58 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE BOX
- Replies: 27
- Views: 754
Re: ICE BOX
If K is 10^-3 then do you assume that x can be represented as 0.
- Tue Jan 28, 2020 12:56 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard enthalpy of formation
- Replies: 6
- Views: 201
Re: Standard enthalpy of formation
During Friday’s lecture, is method 3 a way to solve for enthalpy formation by subtracting the enthalpy of products by reactants?
- Tue Jan 28, 2020 12:54 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard enthalpy of formation
- Replies: 6
- Views: 201
Re: Standard enthalpy of formation
As Lavelle talked about in lecture, Why is graphite the most stable form of carbon?
- Tue Jan 28, 2020 12:22 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 11
- Views: 248
Re: Bond Enthalpies
For Friday’s lecture when we talked about bond enthalpies, are the energy values for each product and reactant going to be given? How can we solve for these values?
- Tue Jan 28, 2020 12:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: salt solutions
- Replies: 4
- Views: 201
Re: salt solutions
Are there any salts that can strongly affect pH? Or do most salts have no affect on pH?
- Tue Jan 28, 2020 12:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: salt solutions
- Replies: 4
- Views: 201
Re: salt solutions
In class we talked about how HCl and NaOH when mixed make NaCl which neutralizes a solution. What are other examples of this?
- Tue Jan 28, 2020 12:05 pm
- Forum: General Science Questions
- Topic: Coordination Compounds
- Replies: 7
- Views: 566
Re: Coordination Compounds
What are all of the coordination compounds that we should look at besides cisplatin and hemoglobin?
- Tue Jan 28, 2020 11:55 am
- Forum: Phase Changes & Related Calculations
- Topic: State Property
- Replies: 6
- Views: 301
Re: State Property
What is the difference between boiling an melting point?
- Thu Jan 23, 2020 12:30 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Buffers
- Replies: 3
- Views: 97
Re: Buffers
Can someone please explain in what situations we would need to solve calculations for a buffer?
- Thu Jan 23, 2020 12:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH sig figs
- Replies: 9
- Views: 406
Re: pH sig figs
does the amount of significant figures for the molar concentration determine the amount of significant figures used after the decimal place of a pH?
- Thu Jan 23, 2020 12:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Best Way To Study?
- Replies: 13
- Views: 586
Re: Best Way To Study?
I find making flash cards helps me understand concepts and memorize them easier.
- Thu Jan 23, 2020 12:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Converting from Kp to Kc
- Replies: 4
- Views: 149
Re: Converting from Kp to Kc
How can there be different values for Kc and Kp if they are both equilibrium constants of a reaction?
- Thu Jan 23, 2020 12:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Converting from Kp to Kc
- Replies: 4
- Views: 149
Re: Converting from Kp to Kc
What is the difference of Kp and Kc?
- Mon Jan 13, 2020 6:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc and Kp
- Replies: 8
- Views: 266
Re: Kc and Kp
Why aren’t solids and liquids included in the equilibrium constant?
- Sun Jan 12, 2020 11:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Types of Equilibrium Constants
- Replies: 7
- Views: 245
Re: Types of Equilibrium Constants
In what instances would the state of a molecule be important? (gaseous, aqueous, solid, or liquid)
- Sun Jan 12, 2020 11:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K (eq constant) vs k (rate constant)?
- Replies: 3
- Views: 136
Re: K (eq constant) vs k (rate constant)?
How can a solution reach equilibrium?
- Sun Jan 12, 2020 11:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 957
Re: Reaction Direction
I am confused with the equilibrium ratio when using molarity values compared to the equilibrium ratio using partial pressure. Can someone please explain this to me. Thank you
- Sun Jan 12, 2020 9:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 957
Re: Reaction Direction
How do you solve for Q in this situation?
- Sun Jan 12, 2020 9:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction Direction
- Replies: 19
- Views: 957
Re: Reaction Direction
I know that K represents the equilibrium constant, but what does Q represent in this situation?
- Sun Dec 08, 2019 11:13 am
- Forum: Identifying Acidic & Basic Salts
- Topic: salt solutions
- Replies: 7
- Views: 443
Re: salt solutions
Do the salts always need to have the involvement of the sodium ion?
- Sun Dec 08, 2019 11:12 am
- Forum: Polyprotic Acids & Bases
- Topic: Polyproptic Acids/Bases
- Replies: 4
- Views: 384
Re: Polyproptic Acids/Bases
Are the hydrogen protons the polyprotic acids that are donated?
- Sun Dec 08, 2019 11:11 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: how the bond works
- Replies: 1
- Views: 278
Re: how the bond works
“How can you predict the number of bonding sites for a given cation?”
I think the lone pairs of a cation will allow for the bonding site of an anion.
I think the lone pairs of a cation will allow for the bonding site of an anion.
- Sun Dec 08, 2019 11:09 am
- Forum: Biological Examples
- Topic: b12?
- Replies: 3
- Views: 260
Re: b12?
I think it’s just that cobalt is water soluble and helps metabolism of the vitamin into your nervous system.
- Sun Dec 08, 2019 11:07 am
- Forum: Lewis Acids & Bases
- Topic: respiratory acidosis
- Replies: 2
- Views: 285
Re: respiratory acidosis
Respiratory acidosis is a condition that occurs when the lungs can't remove enough of the carbon dioxide (CO2) produced by the body. Excess CO2 causes the pH of blood and other bodily fluids to decrease, making them too acidic. ... Oxygen passes from the lungs into the blood. CO2 passes from the blo...
- Sun Dec 08, 2019 11:06 am
- Forum: Air Pollution & Acid Rain
- Topic: acid rain
- Replies: 2
- Views: 347
Re: acid rain
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as ...
- Sun Dec 08, 2019 11:04 am
- Forum: General Science Questions
- Topic: Last minute tips
- Replies: 2
- Views: 402
Re: Last minute tips
I always like to look over my tests and nock out the easiest questions before I answer the harder ones. That was I make sure I get some good points.
- Sun Dec 08, 2019 11:03 am
- Forum: General Science Questions
- Topic: Last minute tips
- Replies: 2
- Views: 402
Re: Last minute tips
Make sure you know the biological functions of transition metals and important ligands (I think they’re ligands: Vitiman B 12, Cisplatin, Myoglobin, Hemoglobin)
- Sun Dec 08, 2019 11:01 am
- Forum: Biological Examples
- Topic: Heme complex
- Replies: 5
- Views: 343
Re: Heme complex
So Fe cation bonds to O2? Is this what allows the more than one complexes to be bonded?
- Sun Dec 08, 2019 10:59 am
- Forum: Hybridization
- Topic: 2sp2 and sp2
- Replies: 10
- Views: 802
Re: 2sp2 and sp2
I think sp2 is fine. The 2 at the beginning only clarifies the energy level.
- Sun Dec 08, 2019 10:56 am
- Forum: Biological Examples
- Topic: chelate
- Replies: 2
- Views: 257
Re: chelate
a compound containing a ligand (typically organic) bonded to a central metal atom at two or more points.
- Sun Dec 08, 2019 10:54 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4041
Re: Bent vs linear
Katherine Chhen 3I wrote:What about AX2E3 since it is linear and not bent?
You cannot have all 3 electrons together because there would be a lot of electron electron repulsion, therefore 2 electrons and one electron would repel from the 2 atoms and allow for this linear shape
- Sun Dec 08, 2019 10:50 am
- Forum: Conjugate Acids & Bases
- Topic: Finding Conjugate A and B
- Replies: 6
- Views: 368
Re: Finding Conjugate A and B
I also learned that your conjugate acid is the one that looks the most similar to your base. And vice versa
Re: Naming
Would we also use these prefixes if we were using oxalato?
- Sun Dec 08, 2019 10:45 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: Hydrogen bonding
- Replies: 3
- Views: 281
Re: Hydrogen bonding
A hydrogen bond is the bond between a hydrogens atom and an N, O, or F atom. You can create intermolecular hydrogen bond by binding one of these atoms from one molecule, with an oxygen from another molecule.
- Mon Nov 18, 2019 7:59 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: Distinguishing forces
- Replies: 2
- Views: 129
Re: Distinguishing forces
How do you find if dipoles cancel out?
- Mon Nov 18, 2019 6:32 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 6
- Views: 249
Re: Hybridization
Does hybridization depend on the number of bonds between atoms?
- Mon Nov 18, 2019 6:24 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: London dispersion
- Replies: 4
- Views: 228
Re: London dispersion
How do you know if a molecule has London dispersion forced?
- Mon Nov 18, 2019 6:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing the Lewis Structure of N20 (2E.13d)
- Replies: 5
- Views: 853
Re: Drawing the Lewis Structure of N20 (2E.13d)
This was very helpful in helping me determine when you make double bonds/ triple bonds/ single bonds.
- Mon Nov 18, 2019 5:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E1 - Molecules with bent geometry
- Replies: 7
- Views: 357
Re: 2E1 - Molecules with bent geometry
What is the difference between lone-lone pair repulsion, lone-bonding pair repulsion, and bonding- bonding pair repulsion? I thought there was only repulsion differences of 2 types such as a lone pair electron pair and an atom.
- Fri Nov 15, 2019 9:19 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E1 - Molecules with bent geometry
- Replies: 7
- Views: 357
Re: 2E1 - Molecules with bent geometry
Do lone pair electrons have a stronger force of repulsion of atoms compared to the strength of atoms repelling against each other?
- Fri Nov 15, 2019 9:17 am
- Forum: Lewis Structures
- Topic: Lewis acids and bases?
- Replies: 7
- Views: 383
Re: Lewis acids and bases?
Is it possible for an acid/base molecule to be covalent?
- Fri Nov 15, 2019 9:16 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Indeterminacy Equation
- Replies: 6
- Views: 500
Re: Heisenberg Indeterminacy Equation
The Heisenberg uncertainty principle states that it is impossible to know simultaneously the exact position and momentum of a particle. So the more defined the position is determined, the momentum is less known, and vice versa.
- Fri Nov 15, 2019 9:11 am
- Forum: Lewis Structures
- Topic: Polar and Non polar covalent bonds in lewis structures
- Replies: 5
- Views: 319
Re: Polar and Non polar covalent bonds in lewis structures
How do you identify the partial charge in a compound?
- Fri Nov 15, 2019 9:11 am
- Forum: Lewis Structures
- Topic: Polar and Non polar covalent bonds in lewis structures
- Replies: 5
- Views: 319
Re: Polar and Non polar covalent bonds in lewis structures
How do you know if a molecule is polar covalent or non polar?
- Fri Nov 01, 2019 12:13 pm
- Forum: Coordinate Covalent Bonds
- Topic: Distinguishing a coordinate covalent bond
- Replies: 5
- Views: 246
Re: Distinguishing a coordinate covalent bond
How do you know when an atom has more covalent character?
- Fri Nov 01, 2019 11:42 am
- Forum: Bond Lengths & Energies
- Topic: Lattice Energy
- Replies: 9
- Views: 408
Re: Lattice Energy
Have we ever been asked questions about solving for lattice energy? Or is it just a concept? If we can solve for it how would we do that?
- Fri Nov 01, 2019 11:32 am
- Forum: Octet Exceptions
- Topic: More than 8 valence e-
- Replies: 8
- Views: 356
Re: More than 8 valence e-
This is a question: so in high school I thought all atoms had 2 electrons in the first sub shell, and in all of the next sub shells the valence electrons were 8. So do all atoms that have a d orbital are able to have more than 8 electrons in a Sub shell?
- Fri Nov 01, 2019 11:21 am
- Forum: Lewis Structures
- Topic: Central atom
- Replies: 6
- Views: 233
Re: Central atom
When drawing lewis structures, you should look at the compound and notice where the atoms are placed on the electron negativity scale. The least electronegative atom is usually your central atom. However there are exceptions such as noble cases. Also sometimes the least moles of the atom in the comp...
- Fri Nov 01, 2019 11:07 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Writing electron configuration
- Replies: 7
- Views: 324
Re: Writing electron configuration
When writing electron configuration you need to write it in numerical order. So the correct answer would be 3d 4s. :)
- Fri Oct 25, 2019 1:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 7
- Views: 314
Re: Resonance
005384106 wrote:Why does sulfur have a double bond in the Lewis structure instead of leaving the electrons as valence electrons?
I am referring to this problem that we did during lecture.
- Fri Oct 25, 2019 1:52 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 7
- Views: 314
Re: Resonance
Why does sulfur have a double bond in the Lewis structure instead of leaving the electrons as valence electrons?
- Fri Oct 25, 2019 1:51 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 7
- Views: 314
Re: Resonance
I didn’t understand why oxygen received a negative charge instead of silver. Can someone please explain this to me?
- Fri Oct 25, 2019 12:30 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8672
Re: Rydberg equation [ENDORSED]
In what kinds of scenarios or questions would we need to use the Rydberg equation? You use the Rydberg equation in scenarios where electrons are moving to different energy levels, or for solving the amount of energy is present on an energy level. Both scenarios are different equations using the R u...
- Fri Oct 25, 2019 12:28 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8672
Re: Rydberg equation [ENDORSED]
I have seen different equations for solving problems about electrons moving to different energy levels using the Rydberg equation and I was wondering what is the correct value of R?
- Fri Oct 25, 2019 12:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy
- Replies: 4
- Views: 246
Re: Ionization Energy
Why is there more energy the farther an atom is from a nucleus?
- Sun Oct 20, 2019 4:26 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Spin
- Replies: 3
- Views: 159
Re: Spin
Why do electrons “spin”? And what does the spin (up/down) represent?
- Sun Oct 20, 2019 4:24 pm
- Forum: Properties of Electrons
- Topic: Equations for Test
- Replies: 9
- Views: 315
Re: Equations for Test
What does. kinetic energy represent?
- Sun Oct 20, 2019 4:22 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 9
- Views: 367
Re: Quantum Numbers
Can I clarify why the n is always less that 1 of l.
- Sun Oct 20, 2019 4:21 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 9
- Views: 367
Re: Quantum Numbers
Does l represent energy level?
- Sun Oct 20, 2019 4:19 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 9
- Views: 367
Re: Quantum Numbers
How does an atoms energy level relate to n and l?
- Sun Oct 06, 2019 8:27 pm
- Forum: Limiting Reactant Calculations
- Topic: limiting reactant
- Replies: 9
- Views: 547
Re: limiting reactant
I have found it easiest to find the limiting reactant by solving for how much product can be produced. This can be used by solving for the amount of moles there are of each reactant and using the molar ratio to solve for the grams of a product and whichever reactant produces the smaller amount of pr...
- Sun Oct 06, 2019 8:23 pm
- Forum: SI Units, Unit Conversions
- Topic: 50 Min test
- Replies: 4
- Views: 137
Re: 50 Min test
On Wednesday I have my first test. I was wondering if questions about the quantum section will be asked or is it just a question about fundamentals/high school chem
- Sun Oct 06, 2019 8:12 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Reactions
- Replies: 25
- Views: 2016
Re: Balancing Reactions
The law of conservation of mass refers to chemical reactions, which is why in nuclear reactions, this is not true. The law states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. This means that matter cannot be created or destroyed, and so the ...
- Sun Oct 06, 2019 8:00 pm
- Forum: Empirical & Molecular Formulas
- Topic: E15 Homework Problem
- Replies: 3
- Views: 377
Re: E15 Homework Problem
First, you need to find which metal element is represented by M in the given compound. You can do this by subtracting the mass of the hydrogen and the oxygens from the molar mass given. 74.10 - ( 2x1.008+2x15.999) =39.94 g/mol Now using the periodic table you will be able to see that the element wit...