Search found 73 matches
- Fri Dec 06, 2019 9:36 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Bacidity w/ atomic radius / electronegativity?
- Replies: 1
- Views: 172
Re: Bacidity w/ atomic radius / electronegativity?
You can't compare the atomic radius because all of the hydrogen atoms are bonded to the oxygen atom. When you consider the atomic radius, it's to consider the bond length; the bigger the atomic radius, the longer the bond length and therefore the weaker the bond. However, the hydrogen atoms in all o...
- Thu Dec 05, 2019 5:54 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: KA, KB, KW
- Replies: 1
- Views: 148
KA, KB, KW
What are all of these constants and how can they be found?
- Thu Dec 05, 2019 12:49 pm
- Forum: General Science Questions
- Topic: Constants and Equations
- Replies: 2
- Views: 388
Constants and Equations
The constants and equations pdf that is on Professor Lavelle's website is the one that is provided on the tests, right?
- Thu Dec 05, 2019 11:58 am
- Forum: Bronsted Acids & Bases
- Topic: Names of acids
- Replies: 1
- Views: 162
Names of acids
Do we have to memorize the names of acids? For example, how HNO2 is nitrous acid and HCLO3 is chloric acid? If so, can someone list the molecular formula and the names of all of the common acids please? Thank you!
- Thu Dec 05, 2019 10:32 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 1
- Views: 185
Polydentate
How do we know which ligands are polydentate by looking at the coordination compound formula? For example, in HN(CH2CH2NH2)2?
- Thu Dec 05, 2019 10:30 am
- Forum: Naming
- Topic: Bis-, Tris-, Tetrakis-
- Replies: 1
- Views: 167
Bis-, Tris-, Tetrakis-
When do we say bis instead of bi when naming coordination compounds?
- Thu Dec 05, 2019 10:28 am
- Forum: Naming
- Topic: Name to Formula
- Replies: 1
- Views: 160
Name to Formula
If we had to write out the formula for tetraamminediaquacobalt(III) bromide, how are we supposed to know that it's Br3?
- Thu Dec 05, 2019 9:58 am
- Forum: Hybridization
- Topic: S Character
- Replies: 4
- Views: 313
S Character
In one of the homework problems, there is a question asking if a bond angle would increase or decrease as the S character of a hybrid orbital increases? What does the "s character" mean? Can someone explain this please? Thank you
- Thu Dec 05, 2019 9:50 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: Cancelling dipoles
- Replies: 2
- Views: 190
Re: Cancelling dipoles
And if, for example, SF4 had to be drawn, the dipoles wouldn't cancel even though all four atoms surround S are the same because S has a lone pair, correct?
- Thu Dec 05, 2019 9:42 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: Cancelling dipoles
- Replies: 2
- Views: 190
Cancelling dipoles
To cancel dipoles, does the electronegative atoms basically have to be straight across from each other? Why can't dipoles cancel, for example, in CH2Cl2?
- Tue Dec 03, 2019 6:54 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Neutral or Negative Acid
- Replies: 2
- Views: 227
Neutral or Negative Acid
In Monday's lecture, Professor Lavelle had questions on the slides and one of them was "Is an acid with pKa of 4.22 neutral or negatively charged at pH 6?" Does anyone know the answer and have an explanation for this?
- Tue Dec 03, 2019 3:08 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming
- Replies: 2
- Views: 211
Naming
How do we know when to use the Latin name of the element instead of the periodic table's name of the element when naming coordination compounds?
- Tue Dec 03, 2019 3:06 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charges of Ligands
- Replies: 1
- Views: 144
Charges of Ligands
Can someone list the charges of common polyatomic ions and ligands, please? Thank you!
- Tue Dec 03, 2019 2:51 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Latin names
- Replies: 2
- Views: 186
Latin names
Do we have to memorize the Latin names of certain elements when naming coordination compounds? Like how iron would be "ferrate"?
- Tue Dec 03, 2019 2:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 3
- Views: 259
Ligands
Is memorizing the only way to know the charges of ligands? How are we supposed to know the charges? Do we have to draw the lewis structure and calculate the charges?
- Tue Dec 03, 2019 2:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand Charge
- Replies: 1
- Views: 140
Ligand Charge
Will ligands always have no charge?
- Tue Dec 03, 2019 1:56 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Porphyrin ligands
- Replies: 2
- Views: 166
Re: Porphyrin ligands
What exactly is a porphyrin ligand?
- Tue Dec 03, 2019 1:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Porphyrin ligands
- Replies: 2
- Views: 166
Porphyrin ligands
What do we need to know about porphyrin ligands?
- Sat Nov 30, 2019 8:16 pm
- Forum: Naming
- Topic: Coordinate covalent bond
- Replies: 1
- Views: 122
Coordinate covalent bond
What is a coordinate covalent bond?
Conjugate
What is a conjugate?
Complex
Can someone explain the concept behind complexes?
- Sat Nov 30, 2019 8:11 pm
- Forum: Naming
- Topic: Coordination compounds
- Replies: 2
- Views: 235
Coordination compounds
Can someone explain the concept behind coordination compounds?
Naming
Can someone list the order in which we name compounds?
- Sun Nov 24, 2019 12:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Non-polar molecules with different non-central atoms
- Replies: 3
- Views: 230
Re: Non-polar molecules with different non-central atoms
They would only be nonpolar if there was one central atom and all of the other atoms were the same element.
- Sun Nov 24, 2019 12:49 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Bronsted vs. Lewis Acids
- Replies: 9
- Views: 542
Re: Bronsted vs. Lewis Acids
Bronsted acids are proton donors whereas lewis acids are electron acceptors.
- Sun Nov 24, 2019 12:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charges
- Replies: 4
- Views: 281
Charges
Is memorizing the only way to know the ionic charges in the periodic table?
- Sun Nov 24, 2019 12:42 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 2
- Views: 109
Re: Coordination Number
Coordination number is always equal to the number of bonds the central atom has made so if there are 6 bonds for en and edta, then yes. The coordination number will always be 6.
- Sun Nov 24, 2019 12:38 pm
- Forum: Hybridization
- Topic: Concept
- Replies: 3
- Views: 212
Concept
What's the overlying concept behind hybridization?
- Sun Nov 17, 2019 1:10 pm
- Forum: Bond Lengths & Energies
- Topic: Polarizability
- Replies: 4
- Views: 350
Polarizability
What's the concept behind the polarizability of anions/cations?
- Sun Nov 17, 2019 1:09 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: Dipole Moments
- Replies: 3
- Views: 244
Dipole Moments
When do dipole moments cancel?
- Sat Nov 16, 2019 1:59 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: Strength of bonds
- Replies: 3
- Views: 166
Strength of bonds
Do we have to know how to calculate the strength of bonds for test 2? If so, how do we do that?
- Sat Nov 16, 2019 1:46 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: Dipole Moments
- Replies: 1
- Views: 102
Dipole Moments
How do we draw dipole moments?
- Sat Nov 16, 2019 12:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarity
- Replies: 6
- Views: 464
Polarity
How do we determine which bonds are polar or not?
- Sat Nov 16, 2019 11:59 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape
- Replies: 6
- Views: 347
Shape
During lecture on 11/15, Dr. Lavelle said molecules with the same formula will have the same general shape. Can someone list all of the different formulas and the corresponding general shape please? Thank you
- Sat Nov 16, 2019 11:55 am
- Forum: General Science Questions
- Topic: Test 2
- Replies: 7
- Views: 403
Test 2
Do we need to know how to calculate anything for Test 2? Or will it all pretty much be concept based?
- Fri Nov 15, 2019 8:55 am
- Forum: General Science Questions
- Topic: Test 2
- Replies: 4
- Views: 301
Test 2
Which topics do we have to study for test 2?
- Tue Nov 12, 2019 9:53 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework for Week 7
- Replies: 5
- Views: 313
Homework for Week 7
Which outline are we supposed to choose homework questions from for week 7?
- Mon Nov 04, 2019 3:44 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic
- Replies: 3
- Views: 261
Ionic
I know that if the difference in electronegativity is greater than 2, it is an ionic bond and if it is less than 1.5, it is a covalent bond. On the midterm, would the electronegativity be given to us so that we can calculate it? Also, what do we do about the gray area between 1.5 and 2? How would we...
- Sun Nov 03, 2019 2:32 pm
- Forum: Lewis Structures
- Topic: Names
- Replies: 4
- Views: 273
Names
Are we expected to know how to draw a lewis structure of something without the molecular formula? For example, if they say "Draw a lewis structure of a periodate ion?"
- Sun Nov 03, 2019 12:17 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 3
- Views: 99
Central Atom
How are we supposed to know which atom will be the central atom when drawing a lewis structure?
- Sat Nov 02, 2019 2:43 pm
- Forum: Lewis Structures
- Topic: Midterm Topics
- Replies: 8
- Views: 269
Midterm Topics
Is everything up until electronegativity going to be on the midterm?
- Sat Nov 02, 2019 1:35 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 4
- Views: 178
Delocalization
Delocalization only applies to resonance structures, correct?
- Sat Nov 02, 2019 1:35 pm
- Forum: Trends in The Periodic Table
- Topic: Trends
- Replies: 2
- Views: 110
Trends
Can someone define electronegativity, electron affinity, and ionization energy and explain the concept behind the trends please?
- Tue Oct 29, 2019 1:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Exceptions to the Octet
- Replies: 2
- Views: 159
Exceptions to the Octet
Are we going to be given the scenarios where there are exceptions to the octet rule so that we can memorize them?
- Tue Oct 29, 2019 1:31 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy
- Replies: 1
- Views: 101
Energy
The further away an electron is from the nucleus, the higher the energy of the electron, correct?
- Wed Oct 23, 2019 4:21 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Oribital Notation
- Replies: 3
- Views: 188
Re: Oribital Notation
My TA told us that we should just be writing it all in one line...so 1s with the orbital notation above it, 2s with the orbital notation above it and so on.
- Wed Oct 23, 2019 4:19 pm
- Forum: Photoelectric Effect
- Topic: Focus 1.31
- Replies: 3
- Views: 145
Re: Focus 1.31
Post the entire question please.
- Wed Oct 23, 2019 4:18 pm
- Forum: Trends in The Periodic Table
- Topic: Location of elements
- Replies: 12
- Views: 723
Re: Location of elements
I'm assuming so. It shouldn't be too difficult since they are kind of grouped together.
- Wed Oct 23, 2019 4:17 pm
- Forum: Lewis Structures
- Topic: Ion lewis structure
- Replies: 9
- Views: 388
Re: Ion lewis structure
No it does not. As long as you end up having the correct number of electrons in the end.
- Wed Oct 23, 2019 4:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 2
- Views: 191
Electron Configuration
How do we know what order to write the electron configuration of a particular element? In other words, how do I know when the d comes before the p?
- Tue Oct 22, 2019 7:16 pm
- Forum: General Science Questions
- Topic: Study Tips
- Replies: 13
- Views: 935
Study Tips
Does anyone have any recommendations on how to study effectively for the midterm?
- Sun Oct 20, 2019 11:37 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework for Week 4
- Replies: 1
- Views: 111
Homework for Week 4
For homework week 4, we can still do questions from the quantum world section, right?
- Tue Oct 15, 2019 7:06 pm
- Forum: DeBroglie Equation
- Topic: HW 1B.15
- Replies: 1
- Views: 147
HW 1B.15
The velocity of an electron emitted from a metallic surface by a photon is 3.6*10^3 km/s. What is the wavelength of the ejected electron? I know we use the formula wavelength=h/mv which would give me (6.626*10^-34 J/s)/[(9.11x10^-31 kg)(3.6*10^6 m/s)]. However, after using this formula, how do we kn...
- Tue Oct 15, 2019 3:58 pm
- Forum: Einstein Equation
- Topic: HW 1B. 7
- Replies: 6
- Views: 453
HW 1B. 7
Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by an excited sodium atom when it generates a photon? I looked in the solutions manual and it showed the formula E=h*frequency and c=wavelength*frequency, and then derived the formula E=h...
- Tue Oct 15, 2019 9:58 am
- Forum: Photoelectric Effect
- Topic: HW 1B.5
- Replies: 8
- Views: 371
HW 1B.5
The gamma ray photons emitted by nuclear decay of technetium-99 atom used in radoopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these gamma rays. In the solutions manual, they convert keV to Joules and I understand why, but why did they multiply 140.511 by 10^3?
- Tue Oct 15, 2019 9:52 am
- Forum: SI Units, Unit Conversions
- Topic: Conversion
- Replies: 2
- Views: 134
Conversion
Can someone explain how to convert from meters to nanometers? For example, if you have 2.26*10^-46 m, how would you convert it to nanometers? And just in general, how do you remember conversions/units.
- Mon Oct 14, 2019 4:43 pm
- Forum: Photoelectric Effect
- Topic: Equations and Formulas
- Replies: 4
- Views: 155
Equations and Formulas
How do we know when to use which formula? For example, there's 1) wavelength = c/frequency, 2) wavelength = hc/E, and 3) wavelength = h/(mass)(velocity). Someone please explain, thank you.
- Mon Oct 14, 2019 4:25 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty Equation
- Replies: 4
- Views: 168
Uncertainty Equation
I just want to double check something. So, if we are certain of the momentum, does the uncertainty of the position increase? And vise versa, if we are certain of the position, does the uncertainty of the momentum increase? Also, when the two uncertainties are multiplied, does getting an answer that ...
- Fri Oct 11, 2019 9:01 pm
- Forum: Einstein Equation
- Topic: Variables in equations
- Replies: 4
- Views: 207
Re: Variables in equations
I believe the "V" for frequency is actually the greek symbol "nu" so it looks a little different than the normal letter V.
- Thu Oct 10, 2019 10:59 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Rounding with basic calculator
- Replies: 16
- Views: 959
Re: Rounding with basic calculator
We are allowed to use scientific calculators. We are not allowed to use graphing calculators.
- Thu Oct 10, 2019 10:56 am
- Forum: Empirical & Molecular Formulas
- Topic: Question E9
- Replies: 4
- Views: 260
Re: Question E9
All of this is covered in fundamental D which is about nomenclature.
- Mon Oct 07, 2019 5:13 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Dilutions
- Replies: 3
- Views: 262
Dilutions
Does the molarity always have to be in mol/L in regards to the test? Question G19 says, "A sample of 1.345 M K2SO4 of volume 12.56 mL is diluted to 250 mL. What's the molar concentration of K2SO4?" I thought that when finding the molarity of K2SO4 in this problem, we would have to convert ...
- Sun Oct 06, 2019 3:12 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Homework for Week 2
- Replies: 4
- Views: 312
Homework for Week 2
I know we are allowed to choose five questions from the HS review for our week 2 hw, but does anyone know if we are allowed to do the same questions as the ones we did on week 1 hw? Not purposely, but because I don't remember which questions I did.
- Sun Oct 06, 2019 2:48 pm
- Forum: Empirical & Molecular Formulas
- Topic: Polyatomic ions
- Replies: 2
- Views: 218
Polyatomic ions
Which polyatomic ions and their charges do we have to know for the HS review test?
- Sun Oct 06, 2019 12:03 pm
- Forum: Empirical & Molecular Formulas
- Topic: Polyatomic Ions
- Replies: 1
- Views: 113
Polyatomic Ions
Do we just need to know the common polyatomic ions and their charges for the HS review test?
- Wed Oct 02, 2019 3:16 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles
- Replies: 5
- Views: 291
Moles
How do you find the amount in moles of F- ions in 25.2 kg of UF6?
- Wed Oct 02, 2019 3:05 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molar Mass
- Replies: 5
- Views: 785
Molar Mass
How does the molar mass change when you have an ion? Is it calculated the same as always?
- Wed Oct 02, 2019 10:13 am
- Forum: Student Social/Study Group
- Topic: Study Group Fall 2019
- Replies: 32
- Views: 2842
Re: Study Group Fall 2019
I am also interested!
- Tue Oct 01, 2019 5:22 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: HW E9 Part B
- Replies: 4
- Views: 272
HW E9 Part B
Part B of question E9 asks to find how many formula units of the compound (magnesium sulfate heptahydrate) are present in 5.15g. How would I solve this?
- Tue Oct 01, 2019 4:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Question about E9 [ENDORSED]
- Replies: 3
- Views: 225
Question about E9 [ENDORSED]
In hw question E9, it asks us to write the formula of magnesium sulfate heptahydrate. Are we expected to know how to write molecular formulas of compounds for the test?
- Tue Oct 01, 2019 3:54 pm
- Forum: Empirical & Molecular Formulas
- Topic: Module Empirical Question
- Replies: 3
- Views: 170
Re: Module Empirical Question
The empirical formula and the molecular formula are the same sometimes which is why you got 1.
- Tue Oct 01, 2019 3:51 pm
- Forum: SI Units, Unit Conversions
- Topic: SI units for exam
- Replies: 6
- Views: 351
Re: SI units for exam
Yes. I heard that he will take points off if you don't get the sig figs correct.
- Tue Oct 01, 2019 3:29 pm
- Forum: SI Units, Unit Conversions
- Topic: Writing chemical equations
- Replies: 2
- Views: 171
Re: Writing chemical equations
One that I saw often was a substance being combusted/burned/oxidized. For this, you would write down the molecular formula of the substance being burned + Oxygen → Water + Carbon Dioxide. Burning a substance always produces water and carbon dioxide, so once you write this down, you just need to bala...