Search found 60 matches

by Kennedi2J
Sun Jan 19, 2020 11:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: determining which way the reaction is going
Replies: 4
Views: 8

Re: determining which way the reaction is going

What is the process for determining which way the reaction is going when we're not dealing with a gas and not a concentration?
by Kennedi2J
Sun Jan 19, 2020 11:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Q
Replies: 14
Views: 27

Re: K vs Q

You can think of Q on a "number line" with K where Q is on either side of K and K is in the middle like 0. When a reaction is not at equilibrium you want to find Q to determine which way the rxn will shift to reach K at equilibrium. If Q is less than K the rxn will move right towards K, th...
by Kennedi2J
Sun Jan 19, 2020 11:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximations
Replies: 3
Views: 7

Re: Approximations

When a concentration value is less than 10^-3 you can approximate that the value is so small that it will not be significant in the problem so you disregard it in the calculation. This approximation is valid if it's less than 5% of the initial concentration.
by Kennedi2J
Sun Jan 19, 2020 11:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Combining Reactions
Replies: 3
Views: 10

Combining Reactions

If two different reactions are given with a K value for each and you are asked to calculate the K value of the third reaction based on what is given, how would you know when to combine or how to combine the reaction the get the K value?
by Kennedi2J
Sun Jan 19, 2020 11:23 pm
Forum: Ideal Gases
Topic: Partial Pressure
Replies: 1
Views: 9

Partial Pressure

For test 1, will we need to know how to calculate the partial pressure of a gas if it isn't given?
by Kennedi2J
Sun Jan 12, 2020 6:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 21
Views: 101

Re: What is this?

You wouldn't necessarily use the principle in a calculation, it's more so to predict which way the reaction will shift given an increase or decrease to the products or reactants.
by Kennedi2J
Sun Jan 12, 2020 6:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Practice Problems
Replies: 4
Views: 36

Practice Problems

Does anyone know of a good homework question that involves applying Le Chatelier's Principle to an actual equation/problem?
by Kennedi2J
Sun Jan 12, 2020 6:28 pm
Forum: Ideal Gases
Topic: Gas Laws
Replies: 6
Views: 47

Re: Gas Laws

Dr. Lavelle also hasn't covered nor mentioned any of the other gas laws so I don't think we would need to explain the definition or specifics of any of them besides the ideal gas law.
by Kennedi2J
Sun Jan 12, 2020 6:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction Quotient Q
Replies: 6
Views: 14

Reaction Quotient Q

How do we distinguish when to calculate Q instead of K or vice versa?
by Kennedi2J
Sun Jan 12, 2020 6:20 pm
Forum: Ideal Gases
Topic: P=(n/v)RT
Replies: 12
Views: 44

Re: P=(n/v)RT

You can get the same answer either way you write it but using P=(n/V)RT makes it easier when you need to convert between the concentration and partial pressure of a compound.
by Kennedi2J
Sun Dec 08, 2019 8:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelating ligands [ENDORSED]
Replies: 21
Views: 1533

Re: chelating ligands [ENDORSED]

An example would be ethylenediamine (en) which binds to a transition metal at 2 sites.
by Kennedi2J
Thu Dec 05, 2019 3:00 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pH, pKa, pKb
Replies: 5
Views: 39

Re: pH, pKa, pKb

Can we use the same formulas for pOH/pH to calculate pKa and pKb?
by Kennedi2J
Thu Dec 05, 2019 2:59 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka and Kb
Replies: 3
Views: 29

Re: Ka and Kb

Is there any examples of this in the textbook? It would make more sense if I saw problem related to this topic
by Kennedi2J
Thu Dec 05, 2019 2:57 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ice tables
Replies: 3
Views: 24

Re: Ice tables

No ICE tables are only used for weak acid/base calculations which we won't be doing for this class.
by Kennedi2J
Thu Dec 05, 2019 2:56 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Calculations
Replies: 1
Views: 14

Calculations

Does anyone know if we will have to use ICE tables for the final in order to calculate pH of strong acids/bases or is this only for weak acids/bases.
by Kennedi2J
Sun Dec 01, 2019 10:19 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equilibrium constants
Replies: 3
Views: 21

Re: Equilibrium constants

kA is just the constant for acids. pkA refers to the pH of kA which is just -log(kA).
by Kennedi2J
Sun Dec 01, 2019 10:16 pm
Forum: Bronsted Acids & Bases
Topic: Conjugate acids and bases
Replies: 5
Views: 38

Re: Conjugate acids and bases

There's also a chart for this online if you look it up. There a list of the strong acids and strong bases that conjugate bases/acids come from.
by Kennedi2J
Sun Dec 01, 2019 10:14 pm
Forum: Bronsted Acids & Bases
Topic: Strong/Weak Acids and Bases
Replies: 2
Views: 23

Re: Strong/Weak Acids and Bases

Do you guys know if we would actually have to know that for the final?
by Kennedi2J
Sun Dec 01, 2019 10:13 pm
Forum: Bronsted Acids & Bases
Topic: Naming
Replies: 4
Views: 27

Naming

Will we have to know how to write the formula for a coordination compound from the name? Like if we're given a long name would we have to write (C6H4)2 or something like that ?
by Kennedi2J
Sun Dec 01, 2019 10:11 pm
Forum: Bronsted Acids & Bases
Topic: naming
Replies: 4
Views: 34

Re: naming

Also, there may be some things not listed on his sheet that may be need to be used in naming like ferrate,etc. is not listed on there.
by Kennedi2J
Sun Dec 01, 2019 10:09 pm
Forum: Bronsted Acids & Bases
Topic: Final
Replies: 13
Views: 81

Re: Final

Does anyone know if calculations for acids and bases will be on the final?
by Kennedi2J
Sun Nov 24, 2019 8:52 pm
Forum: Naming
Topic: Oxidation
Replies: 14
Views: 104

Re: Oxidation

Also can anyone explain what oxidation is? And what Dr. Lavelle meant by oxidation states? I don't remember him explaining the concept in class.
by Kennedi2J
Sun Nov 24, 2019 8:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 2
Views: 29

Test 2

Does anyone know when test 2 will be handed back for sections on Wednesday-Friday since we'll be on break next week?
by Kennedi2J
Sun Nov 24, 2019 8:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hydrogen Bonding
Replies: 13
Views: 56

Hydrogen Bonding

If hydrogen bonding is present does that always mean the molecule is polar?
by Kennedi2J
Sun Nov 24, 2019 8:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 3
Views: 29

Polarity

Will we need to know how to determine the polarity of large compounds/molecules? For example, CH3COOH?
by Kennedi2J
Sun Nov 24, 2019 8:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 14
Views: 109

Re: Test 2

Will we need to know how to draw/know the shape of a molecule with more than one central atom?
by Kennedi2J
Sun Nov 17, 2019 5:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dispersion
Replies: 5
Views: 38

Dispersion

Will we have to know about dispersion and induced dipole for test 2? Or is it only london forces, dipole-dipole, and hydrogen bonding?
by Kennedi2J
Sun Nov 17, 2019 5:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole Moment
Replies: 3
Views: 22

Dipole Moment

Whenever the dipole moments don't cancel can we assume that it is a polar molecule.
by Kennedi2J
Sun Nov 17, 2019 5:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR repulsion model
Replies: 8
Views: 39

Re: VSEPR repulsion model

How do you make sure your'e using the correct Lewis structure when estimating the bond angle?
by Kennedi2J
Sun Nov 17, 2019 5:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Grading
Replies: 7
Views: 69

Re: Grading

I believe he doesn't make the curve until after the final so it changes each quarter but I'm hoping there's some type of curve because that's not a great average.
by Kennedi2J
Sun Nov 17, 2019 5:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 127

Re: Test 2

You should draw the most stable Lewis structure when doing calculating the bond angle.
by Kennedi2J
Sun Nov 17, 2019 5:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Grading
Replies: 7
Views: 69

Grading

Does anyone know the grading scale for this class? I know that 50% is a C- but are the other grades also a lower percentage?
by Kennedi2J
Sun Nov 17, 2019 5:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Order
Replies: 3
Views: 28

Bond Order

Do we need to know the bond order or how to find it when finding the bond angle? Or is the bond order for bond length
by Kennedi2J
Sun Nov 17, 2019 5:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonded and Lone Pairs in VSEPR
Replies: 4
Views: 21

Re: Bonded and Lone Pairs in VSEPR

Do lone pairs also count as a region of electron density?
by Kennedi2J
Sun Nov 17, 2019 5:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we have to memorize the names of shapes and/or the bond angles?
Replies: 7
Views: 40

Re: Do we have to memorize the names of shapes and/or the bond angles?

Does anyone know if test 2 is only covering outline 4? Or is it also outline 3?
by Kennedi2J
Tue Nov 05, 2019 11:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 4
Views: 52

Re: Quantum Numbers

There was also a question: How many electrons can have the following quantum numbers in an atom?
a) n=5, l=3, ml= -1 and the answer was 2 electrons
Can anyone explain why the answer is 2 electrons and not 14 since l corresponds to f orbital and f orbital can hold 14 electrons?
by Kennedi2J
Sun Nov 03, 2019 7:20 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: general question
Replies: 2
Views: 28

Re: general question

What is distortion in terms of electrons?
by Kennedi2J
Sun Nov 03, 2019 7:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ionization Energy
Replies: 3
Views: 20

Re: Ionization Energy

Is it always the case that N has a higher ionization energy than O?
by Kennedi2J
Sun Nov 03, 2019 7:05 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizable vs Polarizing
Replies: 6
Views: 46

Re: Polarizable vs Polarizing

What's the difference between ionic character and covalent character?
by Kennedi2J
Sun Nov 03, 2019 7:02 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted Electrons
Replies: 4
Views: 33

Re: Distorted Electrons

Does this apply to both ionic and covalent bonds?
by Kennedi2J
Sun Nov 03, 2019 7:01 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 3
Views: 23

Re: Polarizing Power

Does polarization power only apply to ionic bonds?
by Kennedi2J
Sun Oct 27, 2019 10:08 pm
Forum: Ionic & Covalent Bonds
Topic: Metals Vs. Nonmetals
Replies: 8
Views: 58

Re: Metals Vs. Nonmetals

I was looking for an answer to that, that explanation was very helpful!
by Kennedi2J
Sun Oct 27, 2019 10:03 pm
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 10
Views: 77

Re: periodic table

Is this the same for ionization energy?
by Kennedi2J
Sun Oct 27, 2019 10:01 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds and Electrons
Replies: 3
Views: 22

Re: Ionic and Covalent Bonds and Electrons

Dr. Lavelle said in lecture that p-block non-metals form anions and gain p valence electrons until the following noble gas electron configuration is reached. Can anyone explain this?
by Kennedi2J
Sun Oct 27, 2019 9:55 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic VS. Covalent Bond
Replies: 8
Views: 33

Re: Ionic VS. Covalent Bond

Dr. Lavelle said in lecture that main group metals form cations and lose s & p valence electrons. Can anyone explain this ?
by Kennedi2J
Sun Oct 27, 2019 9:51 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 69

Re: Covalent Bonds

What did Dr. Lavelle mean when he said non-metals do not form cation because their ionization energies are too high?
by Kennedi2J
Sun Oct 20, 2019 9:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr's Equation
Replies: 5
Views: 53

Re: Bohr's Equation

Does anyone know if all the equations are typically given on the midterm like they were on the test?
by Kennedi2J
Sun Oct 20, 2019 9:18 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 352

Re: Best Way To Study?

Oh wow I had no idea there was solution manual. Thanks!
by Kennedi2J
Sun Oct 20, 2019 9:17 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Kinetic Energy
Replies: 4
Views: 38

Kinetic Energy

In the equation, E= work function + KE (kinetic energy), how do we know when kinetic energy is equal to 0?
by Kennedi2J
Sun Oct 20, 2019 9:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg's Constant
Replies: 3
Views: 30

Re: Rydberg's Constant

Does anyone know what the actual constant is for Rydberg's constant? Or is it the (1/n1 - 1/n2)?
by Kennedi2J
Sun Oct 20, 2019 9:11 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 352

Re: Best Way To Study?

When studying by doing practice problems from the textbook, how do you guys check if your answers are correct? For me many times I may think I got the correct answer when I really didn't.
by Kennedi2J
Sun Oct 20, 2019 9:07 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: States of Matter
Replies: 9
Views: 124

Re: States of Matter

Good response! that explanation helped a lot.
by Kennedi2J
Sun Oct 20, 2019 9:05 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2731

Re: Test 1 [ENDORSED]

Are we able to review the test up until the midterm?
by Kennedi2J
Sun Oct 20, 2019 9:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 20
Views: 785

Re: Accessing the E-textbook [ENDORSED]

Does anyone know if Sapling is mandatory?
by Kennedi2J
Sun Oct 20, 2019 9:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s-, p-, d- ,f- orbitals
Replies: 10
Views: 81

Re: s-, p-, d- ,f- orbitals

Can anyone explain how to list the orbitals for an element. Dr. Lavelle went over it in lecture but he did not explain the process fully.
by Kennedi2J
Sun Oct 13, 2019 10:50 pm
Forum: SI Units, Unit Conversions
Topic: Angstrom
Replies: 16
Views: 195

Re: Angstrom

I believe it’s not because it’s not in the U.S. metric system but I doubt Dr. Lavelle would expect us to know why it’s not.
by Kennedi2J
Sun Oct 13, 2019 10:46 pm
Forum: Properties of Light
Topic: De Broglie equation
Replies: 4
Views: 41

Re: De Broglie equation

Do you guys think that would be asked explicitly in the problem so we would know when to use it ?
by Kennedi2J
Sun Oct 13, 2019 10:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 54324

Re: Tutoring? [ENDORSED]

Is there a contact number for their tutoring ? Or an email? I can’t find it anywhere.
by Kennedi2J
Sun Oct 13, 2019 10:41 pm
Forum: DeBroglie Equation
Topic: Wavelength
Replies: 6
Views: 52

Re: Wavelength

Does anyone have a picture of the slide Dr Lavelle showed in class with infrared radiaton experimental data?
by Kennedi2J
Sun Oct 13, 2019 10:37 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2731

Re: Test 1 [ENDORSED]

Does anyone know when the scores for the test will be up ? Thanks!

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