Search found 60 matches

by 805291863
Fri Jan 17, 2020 3:32 pm
Forum: Ideal Gases
Topic: final exam pickup
Replies: 4
Views: 36

Re: final exam pickup

Does anyone know if we also receive a key to compare our answers to?
by 805291863
Fri Jan 17, 2020 3:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework question 5H.1 PART B
Replies: 2
Views: 10

Re: Homework question 5H.1 PART B

When multiplying the stoichiometric coefficients of a reaction by x, the K value is raised to the power of x. This is why K=(41)^(1/2)

Also, keep in mind that the K value of the reverse reaction is K^(-1)
by 805291863
Fri Jan 17, 2020 3:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gas does not change pressure?
Replies: 7
Views: 27

Re: Inert Gas does not change pressure?

Do you have to change the volume in order to change the pressure? Or would adding a non-inert gas affect pressure as well? There are many ways to change the pressure. If you change the volume, the partial pressures can change. If you add a non-inert gas, then the partial pressures can change depend...
by 805291863
Mon Jan 13, 2020 10:00 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Units for Q- HW 5I.11
Replies: 3
Views: 9

Re: Units for Q- HW 5I.11

Okay, thank you!
by 805291863
Mon Jan 13, 2020 12:08 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Units for Q- HW 5I.11
Replies: 3
Views: 9

Units for Q- HW 5I.11

Do the concentrations used in the calculation of Q have to be in moles per liter? For example, homework problem 5I.11 give the gases with the unit mmol. Should I convert this to mol?
by 805291863
Fri Jan 10, 2020 9:44 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and relation of [R] to [P]
Replies: 5
Views: 36

Re: Q and relation of [R] to [P]

When Q<K, [R]>[P] because [R] is the denominator in determining Q and a larger denominator will make Q smaller than K. The same logic works the other way around. However, it is important to keep in mind that when referring to [R] and [P], the value is the concentrations raised to the power of their ...
by 805291863
Fri Jan 10, 2020 9:40 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 6
Views: 29

Re: Calculating K

It would be the inverse of the concentration because the value for the products would be 1
by 805291863
Fri Jan 10, 2020 9:38 am
Forum: Ideal Gases
Topic: Reaction Quotient (Q)
Replies: 8
Views: 27

Re: Reaction Quotient (Q)

It is a value you can compare to K to determine which direction the reaction is favored in to reach equilibrium
by 805291863
Thu Jan 09, 2020 5:14 pm
Forum: Ideal Gases
Topic: kc to kp
Replies: 2
Views: 17

Re: kc to kp

I believe you can convert Kc to Kp and vice versa. Here is the link to a video working through this concept: https://www.brightstorm.com/science/chemistry/chemical-equilibrium/tips-for-converting-to-kp-from-kc/
by 805291863
Thu Jan 09, 2020 5:12 pm
Forum: Ideal Gases
Topic: K based on phases
Replies: 4
Views: 17

Re: K based on phases

When determining K, only reactants and products that are aqueous or a gas are considered.

Also, a reaction's considered values will either all be pressures or all be concentrations.
by 805291863
Sat Dec 07, 2019 3:14 pm
Forum: Air Pollution & Acid Rain
Topic: Acid Rain & Solutions
Replies: 4
Views: 64

Re: Acid Rain & Solutions

Can NO2 also react with water to form HNO2 and HNO3?
by 805291863
Sat Dec 07, 2019 3:12 pm
Forum: Naming
Topic: Transition Metal Latin Names
Replies: 3
Views: 26

Transition Metal Latin Names

Does anyone know which transition metals need to be named using their latin name in coordination compound naming?
by 805291863
Sat Dec 07, 2019 3:03 pm
Forum: Industrial Examples
Topic: What do we need to know?
Replies: 15
Views: 125

Re: What do we need to know?

I believe that EDTA holds industrial applications when it bonds with metal ions and forms a coordination complex
by 805291863
Sat Dec 07, 2019 2:58 pm
Forum: Biological Examples
Topic: heme complex chelating?
Replies: 3
Views: 56

Re: heme complex chelating?

The porphyrin ligand in polydentate (tetradentate, to be specific), making myoglobin a chelating complex. As to the shape of myoglobin, I believe we do not need to know its shape. However, the "marshmallow" practice problems included a question on the shape of the heme complex. In the revi...
by 805291863
Sat Dec 07, 2019 10:35 am
Forum: Biological Examples
Topic: Main examples
Replies: 2
Views: 30

Re: Main examples

There were multiple examples that Dr. Lavelle touched on during lecture, but I would say that the hemoglobin example is particularly as he spend a good chunk of time on it and since it serves such a vital role.
by 805291863
Sun Dec 01, 2019 11:41 am
Forum: Administrative Questions and Class Announcements
Topic: Asterisks on Chemistry Community
Replies: 1
Views: 23

Asterisks on Chemistry Community

What do the asterisks next to certain topics on Chemistry Community mean? Are the topics that will be covered on examinations?
by 805291863
Sun Dec 01, 2019 11:37 am
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acid Reactions- Loss of Proton(s)?
Replies: 2
Views: 17

Polyprotic Acid Reactions- Loss of Proton(s)?

In a reaction with a polyprotic acid, does it lose one of it protons and then the others in separate reactions or does it donate multiple protons at once?
by 805291863
Sun Dec 01, 2019 11:34 am
Forum: Lewis Acids & Bases
Topic: Neutralization Reactions
Replies: 2
Views: 38

Re: Neutralization Reactions

When selecting the acid and base, my thought process would be to add H to the anion and OH to the cation. The compound with the H would be your acid and the compound with OH would be your base. In a neutralization reaction, the H and OH would form H2O and the remaining anion and cation would form th...
by 805291863
Sun Dec 01, 2019 11:30 am
Forum: Amphoteric Compounds
Topic: Examples of amphoteric compounds
Replies: 5
Views: 25

Re: Examples of amphoteric compounds

In addition to the diagonal band of amphoteric compounds, don't forget that H2O is amphoteric too!
by 805291863
Sun Dec 01, 2019 11:27 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligands
Replies: 2
Views: 27

Re: Chelating Ligands

If a ligand is polydentate, then it is a chelating ligand. To determine if a ligand is polydentate, look at the number of electron pairs it can donate. If it is more than 1 electron pair, then it is polydentate
by 805291863
Sun Nov 24, 2019 3:00 pm
Forum: General Science Questions
Topic: Review Sessions for Final
Replies: 7
Views: 72

Review Sessions for Final

Does anyone know when review sessions for the final will begin?
by 805291863
Sun Nov 24, 2019 2:56 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 8
Views: 43

Strong Acids

Are HCl, HBr, HNO3, and H2SO4 the only strong acids we are required to know? What about HI and HClO4?
by 805291863
Sun Nov 24, 2019 2:52 pm
Forum: Naming
Topic: Naming & Dashes
Replies: 1
Views: 25

Naming & Dashes

When are we supposed to use dashes in the name of coordination compounds?
by 805291863
Sun Nov 24, 2019 2:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lewis Acids
Replies: 4
Views: 25

Re: Lewis Acids

From my understanding, Lewis acids and Bronsted acids are the same. However, the concept used to identify them are different. Based on the Lewis definition, an acid receives and electron pair. Based on the Bronsted definition, an acid donates a proton
by 805291863
Sun Nov 24, 2019 2:47 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 24

Re: Naming

Knowing either column of naming will result in the correct name for this class, but Dr. Lavelle did mention that the column titled "Name" will be the conventionally used naming system
by 805291863
Sat Nov 16, 2019 3:49 pm
Forum: Sigma & Pi Bonds
Topic: Recognizing Sigma and Pi bonds
Replies: 4
Views: 43

Re: Recognizing Sigma and Pi bonds

sarahsalama1G wrote:did we cover sigma and pi bonds? Are we going to cover them this week?


We have not covered sigma and pi bonds yet, but Dr. Lavelle will be covering them during the beginning portion of Monday's lecture. FYI, they will be on the Test 2 occurring this week
by 805291863
Sat Nov 16, 2019 3:46 pm
Forum: Sigma & Pi Bonds
Topic: Sigma & Pi Bonds
Replies: 4
Views: 28

Re: Sigma & Pi Bonds

Does anyone know what type of questions we will be asked regarding sigma and pi bonds? For example, will we just have to identify how many of each type is present in a bond? Will we have to be able to draw it?
by 805291863
Sat Nov 16, 2019 3:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Studying
Replies: 14
Views: 105

Re: Final Studying

I've also looked at finals from the previous years to have an idea of how the final will be different from the midterm. I think that'd be helpful for you too!
by 805291863
Sat Nov 16, 2019 3:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Class Grading
Replies: 3
Views: 40

Re: Class Grading

Essentially, 465/500 will guarantee you a solid A in this class, but having a lower score does not eliminate the potential of getting an A at the end of the quarter.
by 805291863
Fri Nov 15, 2019 4:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and Lewis Structures
Replies: 2
Views: 17

VSEPR and Lewis Structures

Now that we have learned the VSEPR model for determining molecular shapes, does this mean a correct lewis structure (for the purposes of assessments) needs to be drawn in a manner similar to its molecular geometry? Examples: -Should the lewis structure of BF3 be drawn with the F's equidistant from e...
by 805291863
Sun Nov 10, 2019 10:41 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: dipole moment and intermolecular forces
Replies: 3
Views: 25

Re: dipole moment and intermolecular forces

In addition, the intermolecular forces produced by dipole moments would be ion-dipole, dipole-dipole, or dipole-induced dipole interactions.
by 805291863
Sun Nov 10, 2019 10:37 am
Forum: Dipole Moments
Topic: Van Der Waals
Replies: 5
Views: 44

Re: Van Der Waals

As long as a molecule has electrons, it will have Van Der Waals interactions. Therefore, all molecules do
by 805291863
Sun Nov 10, 2019 10:32 am
Forum: Dipole Moments
Topic: Interactions
Replies: 4
Views: 30

Re: Interactions

During lecture, Dr. Lavelle mentioned that they are the same for the purposes of this class
by 805291863
Sun Nov 10, 2019 10:30 am
Forum: Bond Lengths & Energies
Topic: Ionic/covalent Character
Replies: 3
Views: 17

Re: Ionic/covalent Character

The more ionic the nature of the salt is, the more soluble the salt will be in water
by 805291863
Sun Nov 10, 2019 10:27 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle Quantity
Replies: 3
Views: 25

Re: Bond Angle Quantity

I believe it is necessary to know the bond angles of the most standard shapes. However, for molecular shapes in which lone pairs are present, it is only necessary to know the bond angle in relation to the bond angle in the standard shape
by 805291863
Sun Nov 03, 2019 3:56 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Dino Nuggets 12b
Replies: 2
Views: 32

Re: Dino Nuggets 12b

In the case of ClO4-, the lowest energy Lewis structure must have one atom with a formal charge of -1. Because O is more electronegative than Cl, it is more stable when the O has the negative formal charge. Therefore, 3 Cl-O double bonds and 1 Cl-O single bond is the best lewis structure.
by 805291863
Sun Nov 03, 2019 3:46 pm
Forum: Lewis Structures
Topic: Exceptions to octet rule
Replies: 4
Views: 22

Re: Exceptions to octet rule

The other exception to the octet rule is atoms that do not need 8 electrons to be stable. H and Li only want 2 electrons, and B can be stable with 6 electrons.
by 805291863
Sun Nov 03, 2019 3:30 pm
Forum: DeBroglie Equation
Topic: Dino Nugget Problem 8c
Replies: 1
Views: 36

Re: Dino Nugget Problem 8c

You may need to recheck your work in 8b where you find the frequency of the light. The value I calculated was 6.78x10^14 Hz.

However, to directly answer your question, the value you calculated does not fall within the range of visible light.
by 805291863
Sun Nov 03, 2019 12:13 am
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 4
Views: 47

Re: Bruincast

I have checked. The lectures are not bruincasted
by 805291863
Sat Nov 02, 2019 3:18 pm
Forum: DeBroglie Equation
Topic: Lyndon's Workshop Worksheet Problem
Replies: 3
Views: 61

Re: Lyndon's Workshop Worksheet Problem

The equation applies to electromagnetic radiation, which a photon behaves like
by 805291863
Sun Oct 27, 2019 3:15 pm
Forum: Lewis Structures
Topic: Lewis Structure of Ions
Replies: 6
Views: 35

Lewis Structure of Ions

To clarify, do I need to bracket the Lewis Structure of an ion and note the ion's charge in the top right corner outside of the bracket?
by 805291863
Sun Oct 27, 2019 3:11 pm
Forum: Resonance Structures
Topic: Resonance Structures in relation to Formal Charge
Replies: 3
Views: 23

Re: Resonance Structures in relation to Formal Charge

Individual atoms within resonance structures will have different formal charges than other versions. This is because it can have a double bond in one structure and a single bond in another structure which would change the formal charge value of each. Does this mean that all resonance structures are...
by 805291863
Sun Oct 27, 2019 3:04 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 2
Views: 29

Central Atom

Why is the atom with the lowest ionization energy the central atom?
by 805291863
Sun Oct 27, 2019 2:55 pm
Forum: Resonance Structures
Topic: Resonance Structures in relation to Formal Charge
Replies: 3
Views: 23

Resonance Structures in relation to Formal Charge

I'm a bit confused on the relationship between resonance structures and formal charge. Will the formal charges of different resonance structures always be the same?
by 805291863
Sun Oct 27, 2019 2:52 pm
Forum: Octet Exceptions
Topic: Exceeding the Octet Rule
Replies: 5
Views: 65

Exceeding the Octet Rule

During lecture, Dr. Lavelle explained that P, S, and Cl can accommodate more than 8 valence electrons. Does this mean they can have 10 valence electrons and only 10? In other words, do they only use one d-orbital when bonding with other atoms?
by 805291863
Sat Oct 19, 2019 10:19 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for Tungsten
Replies: 1
Views: 28

Re: Electron configuration for Tungsten

If you look closely at Tungsten's location on the periodic table, you'll notice that it follows a f-block of elements (Lanthanum-Lutetium) that is footnoted below the rest of the periodic table. So, tungsten's electron configuration will include the 4f orbital.
by 805291863
Sat Oct 19, 2019 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Posting Image
Replies: 3
Views: 34

Re: Posting Image

Image
by 805291863
Sat Oct 19, 2019 6:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Posting Image
Replies: 3
Views: 34

Posting Image

I've found that sometimes I want to post in image as part of a question or response. How do I do this?
by 805291863
Sat Oct 19, 2019 5:59 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s vs. 3d
Replies: 6
Views: 34

Re: 4s vs. 3d

The electron-electron repulsion within the 3d orbital cause it to have a higher energy than the 4s orbital
by 805291863
Sat Oct 19, 2019 5:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: E configuration of ions
Replies: 2
Views: 19

Re: E configuration of ions

When an atom becomes an ion, it either loses its valence electrons or gains electrons to fill its outermost shell. In relation to the electron configuration, this means that the ion either has the same electron configuration as the atom but without the outermost subshell (the last segment of the ele...
by 805291863
Sat Oct 12, 2019 3:54 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Decreasing gap between energy level
Replies: 6
Views: 66

Re: Decreasing gap between energy level

The pull of the nucleus decreases at higher energy levels because of the distance and because of the shielding provided by the electrons in lower energy levels.
by 805291863
Sat Oct 12, 2019 3:49 pm
Forum: Einstein Equation
Topic: Atomic Spectra
Replies: 2
Views: 52

Re: Atomic Spectra

Maybe the second question is asking if the calculated energies can be experimentally detected?
by 805291863
Sat Oct 12, 2019 3:47 pm
Forum: Properties of Electrons
Topic: Electron After Excited State
Replies: 7
Views: 34

Re: Electron After Excited State

When an excited election falls back to its original state, is the fall a gradual one (e.g. electron from n=3 to n=2 then to n=1) or does it happen in one step? If its a gradual one, is a photon released for each fall or is only one photon released for the entire process?
by 805291863
Sat Oct 12, 2019 3:42 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 4
Views: 35

Re: Wavelength

I completely agree with what the previous person said. However, I want to add that wavelength and frequency are inversely related because c= λ ν. Since c is a constant, wavelength increases when frequency decreases and vice versa.
by 805291863
Sat Oct 12, 2019 3:32 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Groups of Spectral Lines
Replies: 1
Views: 29

Groups of Spectral Lines

Professor Lavelle mentioned that UV light is when a high energy e- drops to the n=1 state, visible light is for the n=2 state, and infrared is for the n=3 state. How does this apply to gamma rays, x-rays, microwaves, and radio waves?
by 805291863
Thu Oct 03, 2019 9:21 pm
Forum: Student Social/Study Group
Topic: Study Group Fall 2019
Replies: 32
Views: 1398

Re: Study Group Fall 2019

I'm interested too! What do I have to do to join?
by 805291863
Thu Oct 03, 2019 9:18 pm
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 116

Re: Test Materials

Does anybody know if we are required to know the common polyatomic ions (their names, formula, and charges) for the quiz on Week 2?
by 805291863
Thu Oct 03, 2019 9:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding
Replies: 12
Views: 161

Re: Rounding

What I do is I use one more digit that the number of significant digits in the given values during all my calculations. At the very, I round my answer to the appropriate number of significant digits.
by 805291863
Thu Oct 03, 2019 9:04 pm
Forum: Balancing Chemical Reactions
Topic: State Symbols
Replies: 5
Views: 97

Re: State Symbols

My TA said that we currently aren't required to include the states of matter in the chemical equations, but we will have to later in the course
by 805291863
Thu Oct 03, 2019 8:58 pm
Forum: SI Units, Unit Conversions
Topic: unit conersations
Replies: 7
Views: 72

Re: unit conersations

If the units of a given value don't match with the units of a conversion factor (e.g. molar mass) or are different from the units of the answer you are looking for, definitely convert your units

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