Search found 73 matches

by 005388369
Fri Dec 06, 2019 9:36 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Bacidity w/ atomic radius / electronegativity?
Replies: 1
Views: 28

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...
by 005388369
Thu Dec 05, 2019 5:54 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: KA, KB, KW
Replies: 1
Views: 30

KA, KB, KW

What are all of these constants and how can they be found?
by 005388369
Thu Dec 05, 2019 12:49 pm
Forum: General Science Questions
Topic: Constants and Equations
Replies: 2
Views: 152

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?
by 005388369
Thu Dec 05, 2019 11:58 am
Forum: Bronsted Acids & Bases
Topic: Names of acids
Replies: 1
Views: 24

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!
by 005388369
Thu Dec 05, 2019 10:32 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 36

Polydentate

How do we know which ligands are polydentate by looking at the coordination compound formula? For example, in HN(CH2CH2NH2)2?
by 005388369
Thu Dec 05, 2019 10:30 am
Forum: Naming
Topic: Bis-, Tris-, Tetrakis-
Replies: 1
Views: 35

Bis-, Tris-, Tetrakis-

When do we say bis instead of bi when naming coordination compounds?
by 005388369
Thu Dec 05, 2019 10:28 am
Forum: Naming
Topic: Name to Formula
Replies: 1
Views: 25

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?
by 005388369
Thu Dec 05, 2019 9:58 am
Forum: Hybridization
Topic: S Character
Replies: 4
Views: 42

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
by 005388369
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: 25

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?
by 005388369
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: 25

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?
by 005388369
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: 42

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?
by 005388369
Tue Dec 03, 2019 3:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming
Replies: 2
Views: 40

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?
by 005388369
Tue Dec 03, 2019 3:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charges of Ligands
Replies: 1
Views: 31

Charges of Ligands

Can someone list the charges of common polyatomic ions and ligands, please? Thank you!
by 005388369
Tue Dec 03, 2019 2:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Latin names
Replies: 2
Views: 27

Latin names

Do we have to memorize the Latin names of certain elements when naming coordination compounds? Like how iron would be "ferrate"?
by 005388369
Tue Dec 03, 2019 2:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 45

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?
by 005388369
Tue Dec 03, 2019 2:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Charge
Replies: 1
Views: 19

Ligand Charge

Will ligands always have no charge?
by 005388369
Tue Dec 03, 2019 1:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Porphyrin ligands
Replies: 2
Views: 28

Re: Porphyrin ligands

What exactly is a porphyrin ligand?
by 005388369
Tue Dec 03, 2019 1:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Porphyrin ligands
Replies: 2
Views: 28

Porphyrin ligands

What do we need to know about porphyrin ligands?
by 005388369
Sat Nov 30, 2019 8:16 pm
Forum: Naming
Topic: Coordinate covalent bond
Replies: 1
Views: 22

Coordinate covalent bond

What is a coordinate covalent bond?
by 005388369
Sat Nov 30, 2019 8:13 pm
Forum: Naming
Topic: Conjugate
Replies: 2
Views: 26

Conjugate

What is a conjugate?
by 005388369
Sat Nov 30, 2019 8:12 pm
Forum: Naming
Topic: Complex
Replies: 2
Views: 26

Complex

Can someone explain the concept behind complexes?
by 005388369
Sat Nov 30, 2019 8:11 pm
Forum: Naming
Topic: Coordination compounds
Replies: 2
Views: 40

Coordination compounds

Can someone explain the concept behind coordination compounds?
by 005388369
Tue Nov 26, 2019 1:16 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 40

Naming

Can someone list the order in which we name compounds?
by 005388369
Sun Nov 24, 2019 12:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Non-polar molecules with different non-central atoms
Replies: 3
Views: 37

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.
by 005388369
Sun Nov 24, 2019 12:49 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Bronsted vs. Lewis Acids
Replies: 9
Views: 76

Re: Bronsted vs. Lewis Acids

Bronsted acids are proton donors whereas lewis acids are electron acceptors.
by 005388369
Sun Nov 24, 2019 12:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charges
Replies: 4
Views: 53

Charges

Is memorizing the only way to know the ionic charges in the periodic table?
by 005388369
Sun Nov 24, 2019 12:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 39

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.
by 005388369
Sun Nov 24, 2019 12:38 pm
Forum: Hybridization
Topic: Concept
Replies: 3
Views: 48

Concept

What's the overlying concept behind hybridization?
by 005388369
Sun Nov 17, 2019 1:10 pm
Forum: Bond Lengths & Energies
Topic: Polarizability
Replies: 4
Views: 63

Polarizability

What's the concept behind the polarizability of anions/cations?
by 005388369
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: 22

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?
by 005388369
Sat Nov 16, 2019 12:00 pm
Forum: Ionic & Covalent Bonds
Topic: Polarity
Replies: 6
Views: 70

Polarity

How do we determine which bonds are polar or not?
by 005388369
Sat Nov 16, 2019 11:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape
Replies: 6
Views: 74

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
by 005388369
Sat Nov 16, 2019 11:55 am
Forum: General Science Questions
Topic: Test 2
Replies: 7
Views: 73

Test 2

Do we need to know how to calculate anything for Test 2? Or will it all pretty much be concept based?
by 005388369
Fri Nov 15, 2019 8:55 am
Forum: General Science Questions
Topic: Test 2
Replies: 4
Views: 59

Test 2

Which topics do we have to study for test 2?
by 005388369
Tue Nov 12, 2019 9:53 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework for Week 7
Replies: 5
Views: 62

Homework for Week 7

Which outline are we supposed to choose homework questions from for week 7?
by 005388369
Mon Nov 04, 2019 3:44 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic
Replies: 3
Views: 55

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...
by 005388369
Sun Nov 03, 2019 2:32 pm
Forum: Lewis Structures
Topic: Names
Replies: 4
Views: 49

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?"
by 005388369
Sun Nov 03, 2019 12:17 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 3
Views: 24

Central Atom

How are we supposed to know which atom will be the central atom when drawing a lewis structure?
by 005388369
Sat Nov 02, 2019 2:43 pm
Forum: Lewis Structures
Topic: Midterm Topics
Replies: 8
Views: 72

Midterm Topics

Is everything up until electronegativity going to be on the midterm?
by 005388369
Sat Nov 02, 2019 1:35 pm
Forum: Resonance Structures
Topic: Delocalization
Replies: 4
Views: 54

Delocalization

Delocalization only applies to resonance structures, correct?
by 005388369
Sat Nov 02, 2019 1:35 pm
Forum: Trends in The Periodic Table
Topic: Trends
Replies: 2
Views: 44

Trends

Can someone define electronegativity, electron affinity, and ionization energy and explain the concept behind the trends please?
by 005388369
Tue Oct 29, 2019 1:33 pm
Forum: Ionic & Covalent Bonds
Topic: Exceptions to the Octet
Replies: 2
Views: 28

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?
by 005388369
Tue Oct 29, 2019 1:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy
Replies: 1
Views: 27

Energy

The further away an electron is from the nucleus, the higher the energy of the electron, correct?
by 005388369
Wed Oct 23, 2019 4:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Oribital Notation
Replies: 3
Views: 38

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.
by 005388369
Wed Oct 23, 2019 4:19 pm
Forum: Photoelectric Effect
Topic: Focus 1.31
Replies: 3
Views: 52

Re: Focus 1.31

Post the entire question please.
by 005388369
Wed Oct 23, 2019 4:18 pm
Forum: Trends in The Periodic Table
Topic: Location of elements
Replies: 12
Views: 175

Re: Location of elements

I'm assuming so. It shouldn't be too difficult since they are kind of grouped together.
by 005388369
Wed Oct 23, 2019 4:17 pm
Forum: Lewis Structures
Topic: Ion lewis structure
Replies: 9
Views: 94

Re: Ion lewis structure

No it does not. As long as you end up having the correct number of electrons in the end.
by 005388369
Wed Oct 23, 2019 4:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 2
Views: 34

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?
by 005388369
Tue Oct 22, 2019 7:16 pm
Forum: General Science Questions
Topic: Study Tips
Replies: 13
Views: 183

Study Tips

Does anyone have any recommendations on how to study effectively for the midterm?
by 005388369
Sun Oct 20, 2019 11:37 am
Forum: Administrative Questions and Class Announcements
Topic: Homework for Week 4
Replies: 1
Views: 28

Homework for Week 4

For homework week 4, we can still do questions from the quantum world section, right?
by 005388369
Tue Oct 15, 2019 7:06 pm
Forum: DeBroglie Equation
Topic: HW 1B.15
Replies: 1
Views: 45

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...
by 005388369
Tue Oct 15, 2019 3:58 pm
Forum: Einstein Equation
Topic: HW 1B. 7
Replies: 6
Views: 262

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...
by 005388369
Tue Oct 15, 2019 9:58 am
Forum: Photoelectric Effect
Topic: HW 1B.5
Replies: 8
Views: 122

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?
by 005388369
Tue Oct 15, 2019 9:52 am
Forum: SI Units, Unit Conversions
Topic: Conversion
Replies: 2
Views: 51

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.
by 005388369
Mon Oct 14, 2019 4:43 pm
Forum: Photoelectric Effect
Topic: Equations and Formulas
Replies: 4
Views: 66

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.
by 005388369
Mon Oct 14, 2019 4:25 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Equation
Replies: 4
Views: 54

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 ...
by 005388369
Fri Oct 11, 2019 9:01 pm
Forum: Einstein Equation
Topic: Variables in equations
Replies: 4
Views: 73

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.
by 005388369
Thu Oct 10, 2019 10:59 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding with basic calculator
Replies: 7
Views: 297

Re: Rounding with basic calculator

We are allowed to use scientific calculators. We are not allowed to use graphing calculators.
by 005388369
Thu Oct 10, 2019 10:56 am
Forum: Empirical & Molecular Formulas
Topic: Question E9
Replies: 4
Views: 98

Re: Question E9

All of this is covered in fundamental D which is about nomenclature.
by 005388369
Mon Oct 07, 2019 5:13 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilutions
Replies: 3
Views: 80

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 ...
by 005388369
Sun Oct 06, 2019 3:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework for Week 2
Replies: 4
Views: 99

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.
by 005388369
Sun Oct 06, 2019 2:48 pm
Forum: Empirical & Molecular Formulas
Topic: Polyatomic ions
Replies: 2
Views: 60

Polyatomic ions

Which polyatomic ions and their charges do we have to know for the HS review test?
by 005388369
Sun Oct 06, 2019 12:03 pm
Forum: Empirical & Molecular Formulas
Topic: Polyatomic Ions
Replies: 1
Views: 46

Polyatomic Ions

Do we just need to know the common polyatomic ions and their charges for the HS review test?
by 005388369
Wed Oct 02, 2019 3:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles
Replies: 5
Views: 92

Moles

How do you find the amount in moles of F- ions in 25.2 kg of UF6?
by 005388369
Wed Oct 02, 2019 3:05 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molar Mass
Replies: 5
Views: 77

Molar Mass

How does the molar mass change when you have an ion? Is it calculated the same as always?
by 005388369
Wed Oct 02, 2019 10:13 am
Forum: Student Social/Study Group
Topic: Study Group Fall 2019
Replies: 32
Views: 1668

Re: Study Group Fall 2019

I am also interested!
by 005388369
Tue Oct 01, 2019 5:22 pm
Forum: Molarity, Solutions, Dilutions
Topic: HW E9 Part B
Replies: 4
Views: 86

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?
by 005388369
Tue Oct 01, 2019 4:40 pm
Forum: Limiting Reactant Calculations
Topic: Question about E9 [ENDORSED]
Replies: 3
Views: 100

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?
by 005388369
Tue Oct 01, 2019 3:54 pm
Forum: Empirical & Molecular Formulas
Topic: Module Empirical Question
Replies: 3
Views: 109

Re: Module Empirical Question

The empirical formula and the molecular formula are the same sometimes which is why you got 1.
by 005388369
Tue Oct 01, 2019 3:51 pm
Forum: SI Units, Unit Conversions
Topic: SI units for exam
Replies: 6
Views: 84

Re: SI units for exam

Yes. I heard that he will take points off if you don't get the sig figs correct.
by 005388369
Tue Oct 01, 2019 3:29 pm
Forum: SI Units, Unit Conversions
Topic: Writing chemical equations
Replies: 2
Views: 100

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...

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