Search found 62 matches

by VioletKo3F
Thu Jan 23, 2020 10:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.35
Replies: 1
Views: 13

5.35

In problem 5.35, how would you figure out the balanced chemical equation just from the partial pressures?
by VioletKo3F
Fri Jan 17, 2020 6:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong or weak acid?
Replies: 5
Views: 28

Re: Strong or weak acid?

I think memorizing the strong acids and bases will help since there aren't many of them to begin with. Just assume everything else is weak.
by VioletKo3F
Fri Jan 17, 2020 6:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Product Yield
Replies: 6
Views: 18

Re: Product Yield

If the product is removed, the reaction will immediately favor the forward reaction, producing more product.
by VioletKo3F
Fri Jan 17, 2020 6:22 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH for weak acids
Replies: 5
Views: 21

Re: pH for weak acids

Lower pH means a higher acidity and more H+ in the solutions. Stronger acids have a higher acidity and they also dissociate completely, meaning more H+.
by VioletKo3F
Fri Jan 17, 2020 6:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Change
Replies: 9
Views: 46

Re: Temperature Change

Since the reaction is endothermic, when the temperature is raised the reaction favors the products since it shifts to the right due to the reaction using up the heat to produce more products.
by VioletKo3F
Fri Jan 17, 2020 4:46 pm
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 86

Re: Test 1 [ENDORSED]

Test 1 starts in discussion sections next week. It will cover the first two units: chemical equilibrium and acids and bases.
by VioletKo3F
Sun Jan 12, 2020 2:21 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different K's
Replies: 5
Views: 23

Re: Different K's

The c in Kc stands for concentration while the p in Kp stands for pressure. It just depends on which you are using to determine the K.
by VioletKo3F
Sun Jan 12, 2020 2:20 am
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 53

Re: PV = nRT

P is pressure, v is volume, n is the number of moles, R is the Ideal Gas Constant (8.314 J / mol·K), and T is the temperature in K.
by VioletKo3F
Sun Jan 12, 2020 2:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Significant Figures
Replies: 8
Views: 36

Re: Significant Figures

You would have to take into consideration all the numbers you used in the calculation of the k value. Just use the numbers given to you in the question to determine your sig figs.
by VioletKo3F
Sun Jan 12, 2020 2:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Changes in pressure
Replies: 3
Views: 15

Re: Changes in pressure

Volume has a direct relationship with pressure, so if one increased, the other would also increase and vise versa.
by VioletKo3F
Sun Jan 12, 2020 2:16 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial pressure
Replies: 4
Views: 18

Re: Partial pressure

In a mixture of gas, each gas is responsible for a partial pressure. In comparison, the total pressure is just the sum of these partial pressures.
by VioletKo3F
Sun Dec 08, 2019 8:46 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate
Replies: 4
Views: 54

Re: polydentate

Is a molecule polydentate as long as it has a lone pair to bind?
by VioletKo3F
Sun Dec 08, 2019 8:45 am
Forum: Biological Examples
Topic: Hemoglobin and Myoglobin
Replies: 4
Views: 52

Hemoglobin and Myoglobin

What do we need to know about Hemoglobin and Myoglobin? How would they be tested?
by VioletKo3F
Sun Dec 08, 2019 2:41 am
Forum: Lewis Acids & Bases
Topic: Lewis Structure
Replies: 2
Views: 24

Lewis Structure

How can you tell if a compound is a lewis acid or base by looking at their lewis structure?
by VioletKo3F
Sun Dec 08, 2019 2:39 am
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 7
Views: 50

Re: Lewis vs Bronsted

How are some molecules Lewis acids but not Bronsted acids?
by VioletKo3F
Sat Dec 07, 2019 10:11 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic
Replies: 7
Views: 44

Re: Amphiprotic

A amphiprotic molecule can both act as a proton acceptor and donator. It has both the characteristics of an acid and a base.
by VioletKo3F
Mon Dec 02, 2019 12:37 am
Forum: Conjugate Acids & Bases
Topic: Definition
Replies: 7
Views: 42

Re: Definition

Based on the Brønsted–Lowry acid–base theory, a conjugate acid is formed by a base receiving a proton. A conjugate base is the opposite - it is the base formed when the acid donates a proton.
by VioletKo3F
Mon Dec 02, 2019 12:35 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Difference between inorganic and organic
Replies: 4
Views: 37

Re: Difference between inorganic and organic

Simply put, organic compounds that acts as a base are called organic bases. They are usually proton acceptors and contain nitrogen since it can be easily protonated.
by VioletKo3F
Mon Dec 02, 2019 12:33 am
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 102

Re: Sigma vs. Pi

Sigma bonds are significantly stronger than pi bonds because of an overlap in orbitals.
by VioletKo3F
Mon Dec 02, 2019 12:32 am
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 21
Views: 100

Re: T-shape

A t-shaped molecular geometry has 3 ligands attached to a central atom. The bonds form a 90 degrees and the attachments form a t-shape.
by VioletKo3F
Mon Dec 02, 2019 12:30 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: seesaw
Replies: 4
Views: 40

Re: seesaw

It is relevant in describing conjugate acids or bases that define a Brønsted-Lowry acid-base reaction.
by VioletKo3F
Sat Nov 23, 2019 4:12 pm
Forum: Hybridization
Topic: 2F15
Replies: 4
Views: 32

Re: 2F15

To give an example, sp hybridization has a bond angle of 180 while sp2 has a bond angle of 120. The s-characteristic of the sp hybridization is larger and has a larger bond angle.
by VioletKo3F
Sat Nov 23, 2019 4:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Break
Replies: 4
Views: 47

Re: Thanksgiving Break

Does anyone know if there's discussion on Wednesday?
by VioletKo3F
Sat Nov 23, 2019 4:08 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: Hydrogen Bonding Rules
Replies: 6
Views: 51

Re: Hydrogen Bonding Rules

There are two nitrogen atoms with a lone pair each, so it makes sense for there to be two hydrogen bonding sites.
by VioletKo3F
Sat Nov 23, 2019 4:07 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 6
Views: 29

Re: Sigma and Pi Bonds

The orbitals that form sigma bonds overlap more than the orbitals forming the pi bonds so they are much stronger.
by VioletKo3F
Wed Nov 20, 2019 12:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 8
Views: 48

Lone Pairs

What does it mean to "explain why lone pairs are more likely to found in certain locations around a central atom and
how and why they affect the bond angles in a molecule, cation, or anion"?
by VioletKo3F
Sun Nov 17, 2019 11:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electronegativity
Replies: 6
Views: 24

Re: electronegativity

Look up the electronegativity on the table and subtract the smaller electronegativity from the larger one.
by VioletKo3F
Sun Nov 17, 2019 11:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER
Replies: 7
Views: 49

Re: VSPER

Valence-shell electron-pair repulsion (VSEPR) is a model used to predict the 3d geometry of molecules based on the electron pairs and bonds.
by VioletKo3F
Sun Nov 17, 2019 11:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance and VSEPR
Replies: 9
Views: 40

Re: Resonance and VSEPR

Resonance structures do not affect vsepr structures - they only explain molecular shape.
by VioletKo3F
Sun Nov 17, 2019 11:43 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 7
Views: 57

Re: test 2

Are there any review worksheets being posted?
by VioletKo3F
Tue Nov 12, 2019 11:42 pm
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 148

Re: Week 7 Homework

Are we allowed to do 3F questions as well?
by VioletKo3F
Fri Nov 08, 2019 9:34 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge
Replies: 9
Views: 473

Re: Formal Charge

What's the equation for the formal charge?
by VioletKo3F
Fri Nov 08, 2019 9:33 am
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 246

Re: Midterm grades

Does anyone know if we'll get the actual midterm back? Or is it only our grades?
by VioletKo3F
Fri Nov 08, 2019 9:32 am
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 141

Re: Test 2

No, it should only cover new topics covered after the midterm.
by VioletKo3F
Wed Nov 06, 2019 2:20 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 2
Views: 65

Midterm

Are acids and bases on the midterm? I went over the homework questions and there was nothing on it, but the outline for bonding includes it. If so, what do you need to know?
by VioletKo3F
Tue Oct 29, 2019 6:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 5 HW
Replies: 4
Views: 45

Re: Week 5 HW

We finished the quantum world last week and started on chemical bonding so I also think it should be only chemical bonding for week 5.
by VioletKo3F
Tue Oct 29, 2019 6:08 pm
Forum: Properties of Light
Topic: Wave vs. Particle Model
Replies: 2
Views: 30

Wave vs. Particle Model

What do we need to know about the wave vs particle model of electromagnetic radiation? How would it be covered on a midterm if it did show up?
by VioletKo3F
Tue Oct 29, 2019 6:06 pm
Forum: Resonance Structures
Topic: Expanded octets
Replies: 2
Views: 21

Re: Expanded octets

The expanded octet needs open spots on the d orbital, which has a total of 10 electrons max. So I believe at most there would be 10 electrons added.
by VioletKo3F
Tue Oct 29, 2019 6:04 pm
Forum: Resonance Structures
Topic: resonance vs resonance hybrid
Replies: 2
Views: 20

Re: resonance vs resonance hybrid

Resonance hybrids have a structure written as the average of two+ structural formulas separated by a double-headed arrow. It is also defined as "the net sum of valid resonance structures."
by VioletKo3F
Tue Oct 29, 2019 5:58 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 183

Re: Midterm

I heard the midterm covers the fundamentals, quantum world, and chemical bonds, but try to focus more on quantum world.
by VioletKo3F
Tue Oct 29, 2019 5:56 pm
Forum: Ionic & Covalent Bonds
Topic: Dipole vs ionic bond
Replies: 2
Views: 18

Re: Dipole vs ionic bond

Partial charges are for polar covalent bonds and dipole moments, so I believe your TA mixed it up.
by VioletKo3F
Tue Oct 29, 2019 5:54 pm
Forum: Trends in The Periodic Table
Topic: Energy of Noble Gases
Replies: 2
Views: 14

Re: Energy of Noble Gases

I don't really know what you mean by lowest energy level, but the noble gases are the least reactive and have the lowest electronegativity.
by VioletKo3F
Tue Oct 29, 2019 5:51 pm
Forum: Dipole Moments
Topic: intermolecular interactions
Replies: 2
Views: 33

Re: intermolecular interactions

The post above pretty much sums it all up so here's a link if you want extra information: https://chem.libretexts.org/Bookshelves ... rown_et_al.)/11%3A_Liquids_and_Intermolecular_Forces/11.2%3A_Intermolecular_Forces
by VioletKo3F
Tue Oct 29, 2019 5:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice on Homework
Replies: 13
Views: 149

Re: Advice on Homework

I usually do all the homework problems per each section after the lectures so that it'll help me study for the midterm. But technically, you only have to do 5 just to get the points for homework.
by VioletKo3F
Tue Oct 29, 2019 5:49 pm
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 55

Re: Study For midterm

A lot of the workshops offer worksheets and extra practice with certain topics. If you need help with a certain section, I would also try going to the step-ups. There are review sessions just for the midterm as well so I would definitely recommend attending these.
by VioletKo3F
Tue Oct 29, 2019 5:47 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths
Replies: 15
Views: 139

Re: Bond lengths

Does anyone know that actual length of double and triple bonds? Will we need to know this on the tests?
by VioletKo3F
Tue Oct 29, 2019 5:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Do Midterm Review Sessions Repeat Topics?
Replies: 4
Views: 35

Re: Do Midterm Review Sessions Repeat Topics?

There are many review sessions posted on the website so you should look at the schedule and plan out which ones you want to make.
by VioletKo3F
Fri Oct 18, 2019 2:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ground State [ENDORSED]
Replies: 5
Views: 69

Re: Ground State [ENDORSED]

In a ground state, the electrons are in the lowest energy levels and cannot be lowered any further by transferring them to different orbitals.
by VioletKo3F
Fri Oct 18, 2019 2:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 356

Re: Best Way To Study?

I would try to go over all the homework problems and take notes on parts of the textbook that were a little more challenging conceptually. Also, I think it's really helpful to go to the workshops since they give out worksheets with more challenging questions that may come up on tests.
by VioletKo3F
Thu Oct 17, 2019 3:27 pm
Forum: DeBroglie Equation
Topic: Constant Question
Replies: 7
Views: 47

Re: Constant Question

I would use whatever value is given on the equation sheet to be safe. Rounding should always come at the end so don't be lazy when doing the calculations.
by VioletKo3F
Thu Oct 17, 2019 3:22 pm
Forum: Properties of Light
Topic: EM Spectrum
Replies: 3
Views: 33

Re: EM Spectrum

I think you might need to know ranges for visible light wavelengths (others that are longer/ shorter than visible) and maybe the different series (lyman, balmer, etc)
by VioletKo3F
Fri Oct 11, 2019 9:55 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 1609

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Cassandra_1K wrote:For limiting reactants on the test do we have to explain how we know one is a limiting reactant or can we just specify which one?

You should show the work for how you found the limiting reactant. Even if you're wrong, you would be able to get partial credit for explaining.
by VioletKo3F
Fri Oct 11, 2019 9:40 am
Forum: Properties of Light
Topic: Converting units
Replies: 8
Views: 40

Re: Converting units

Since Angstroms are 1*10^-10m and nm are 1*10^-9m, the nm is 10 times larger than the Angstrom. To convert from nm to Angstrom, you would just multiply by 10.
by VioletKo3F
Mon Oct 07, 2019 3:24 pm
Forum: Properties of Light
Topic: Chapter 1 Homework Question [ENDORSED]
Replies: 7
Views: 2093

Re: Chapter 1 Homework Question [ENDORSED]

Personally I don't quite understand the correspondence between energy and "The extent of the change in the electrical field at a given point". Could someone explain this aspect please? Thank you! To clarify, "the extent of change" can be seen as slope. Try drawing it out: one wa...
by VioletKo3F
Sun Oct 06, 2019 9:01 pm
Forum: General Science Questions
Topic: Periodic Table
Replies: 5
Views: 69

Periodic Table

Does anyone know what the number in parenthesis next to the standard atomic weight stands for?
Ex.
H
hydrogen
1.00794(7)
What's the 7?
by VioletKo3F
Sun Oct 06, 2019 8:57 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 6
Views: 77

Re: Unit Conversions

I don't think the unit prefixes will be tested directly on the test, but it might come up in the questions (ex. How many molecules are there in 56 mg of...) I would recommend finding a mnemonic that corresponds with each prefix. There's a lot of them online so try finding one that's easy for you to ...
by VioletKo3F
Mon Sep 30, 2019 8:54 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Calculations in Two-Step Reactions
Replies: 4
Views: 28

Limiting Reactant Calculations in Two-Step Reactions

I went to the workshop today but had to leave early, so if anyone can explain this problem for me, I would be really grateful :') The following two-step reactions produces hydrogen: Step 1: CH4 +H2O - > CO + 3H2 Step 2: CO + H2O -> CO2 +H2 Given 0.036g of methane (CH4) and 0.108g of water, how much ...
by VioletKo3F
Mon Sep 30, 2019 8:43 pm
Forum: Significant Figures
Topic: How to Write Out Final Answers
Replies: 5
Views: 55

Re: How to Write Out Final Answers

Also, make sure to pay attention for the sig figs in the questions. Although they're small points, he still looks for them in final answers.
by VioletKo3F
Mon Sep 30, 2019 8:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice on Homework
Replies: 13
Views: 149

Re: Advice on Homework

I also know that it's a lot of work, but think of the homework more as studying/practicing for the tests and quizzes. If you are aiming for a high grade in the class, I would definitely recommend trying all of them.
by VioletKo3F
Mon Sep 30, 2019 8:35 pm
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 307

Re: Question About Significant Figures and Rounding

Hi, I was also having trouble with sig figs, especially since I was a little rusty from high school chemistry. Like I usually do with everything, I searched it up on Google and I found this site (http://chemistry.bd.psu.edu/jircitano/sigfigs.html) does a good job summing everything up. I also attend...
by VioletKo3F
Mon Sep 30, 2019 8:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 3392

Re: Advice from a Medical Student - Part II [ENDORSED]

First of all, thank you for sharing your advice! As I was reading through the replies, you specifically said to be involved in clubs or extracurriculars that set you apart from the other pre-med students. Can you give us some examples that you found insightful and unique?

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