Search found 66 matches

by ashwathinair
Wed Jan 22, 2020 7:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong Acids and Bases in Water
Replies: 1
Views: 11

Strong Acids and Bases in Water

How should we go about trying to find the pH or pOH of a solution where a strong acid or base is poured into water? Like I know the pH or pOH shouldn't change much and we don't use an ice table, but then what can we do to find the pH?
by ashwathinair
Mon Jan 20, 2020 4:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Percentage Protonation
Replies: 1
Views: 26

Percentage Protonation

What is the equation to find percentage protonation? What does percentage protonation measure?
by ashwathinair
Mon Jan 20, 2020 3:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6B 9
Replies: 3
Views: 28

6B 9

(a) Complete the following table. (b) Rank the four solutions in order of increasing acidity. [H3O+] [OH-] pH pOH (i) [H3O+] is 1.50 mol/L (ii) [OH-] 1.50 mol/L (iii) pH is 0.75 (iv) pOH is 0.75 When calculating pH for the first two rows, the pH and pOH were either negative or over 14. Is this possi...
by ashwathinair
Mon Jan 20, 2020 3:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6B 11
Replies: 3
Views: 40

6B 11

A student added solid Na2O to a volumetric flask of volume 200.0 mL, which was then filled with water, resulting in 200.0 mL of NaOH solution. Then 5.00 mL of the solution was transferred to another volumetric flask and diluted to 500.0 mL. The pH of the diluted solution is 13.25. (a) What is the mo...
by ashwathinair
Sun Jan 19, 2020 4:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acids/Bases and Chemical Equilibrium
Replies: 2
Views: 12

Acids/Bases and Chemical Equilibrium

I understand the steps to do chemical equilibrium problems for chemical equations that aren't acids and bases; in general, what is added to the basic framework of solving regular chemical equilibrium reactions when trying to find chemical equilibria (and related pH/pOH) for acid base reactions?
by ashwathinair
Sun Jan 19, 2020 4:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I 33
Replies: 2
Views: 11

5I 33

A sample of ammonium carbamate, NH4(NH2CO2), of mass 25.0 g was placed in an evacuated flask of volume 0.250 L and kept at 25 C. At equilibrium, 17.4 mg of CO2 was present. What is the value of Kc for the decomposition of ammonium carbamate into ammonia and carbon dioxide? The reaction is NH4(NH2CO2...
by ashwathinair
Sun Jan 19, 2020 4:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 4
Views: 16

Le Chatelier's Principle

How can Le Chatelier's principle be applied to partial pressures?
by ashwathinair
Thu Jan 16, 2020 1:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 8
Views: 25

Approximation

Can someone explain how and when we use approximation for ICE tables? Are there other situations you can use them as well? Is this only for acids and bases?
by ashwathinair
Wed Jan 15, 2020 5:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A 21
Replies: 2
Views: 29

6A 21

The value of Kw for water at body temperature (37 C) is
2.1 * 10^-14. (a) What is the molar concentration of H3O+ ions at
37 C? (b) What is the molar concentration of OH- in neutral
water at 37 C?

I understand that Kw = [H3O+][OH-], but I am not sure where to go from here.
by ashwathinair
Sun Jan 12, 2020 12:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Factors Affecting K
Replies: 5
Views: 29

Factors Affecting K

What factors change a K value of an equilibrium reaction (other than temperature), and why?
by ashwathinair
Sun Jan 12, 2020 12:39 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE vs Normal Concentrations
Replies: 5
Views: 18

ICE vs Normal Concentrations

In what situations should we use the ICE method; in what situations should we use regular equilibrium concentrations?
by ashwathinair
Sun Jan 12, 2020 12:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature and K
Replies: 6
Views: 34

Temperature and K

What effect does temperature have on the K value, and why does the K value change with temperature?
by ashwathinair
Sun Jan 12, 2020 12:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure substances in reactions
Replies: 2
Views: 18

Pure substances in reactions

Can there never be any reactions that only contain pure substances (purely liquid or solid)? For example, are reactions like the ones modeled below never possible? If so, why?
Solid + Solid <--> Solid
Liquid + Liquid <--> Liquid
Liquid + Solid <--> Solid + Liquid
by ashwathinair
Sun Jan 12, 2020 12:33 pm
Forum: Ideal Gases
Topic: Bars vs atmospheres
Replies: 13
Views: 36

Bars vs atmospheres

What is the difference between bars and atmospheres as units for finding Kp or Qp? Which one is used, and if it is either, why are both applicable?
by ashwathinair
Sun Dec 08, 2019 12:43 am
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 60

Re: Options to reduce acid rain

Riya Sood 4C wrote:Acid rain can be reduced by reducing burning of fossil fuels. Also, neutralizers like limestone can be used


is that all we have to know for the final about neutralizing acid rain? Are there any specific chemical concepts we should know behind these options to reduce acid rain?
by ashwathinair
Sun Dec 08, 2019 12:37 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Using Ka or Kb to find pKa or pKb
Replies: 2
Views: 23

Using Ka or Kb to find pKa or pKb

We have the formulas to find pKa and pKb, but if we are given an acid or base without the Ka or Kb how do we find the pKa or pKb? Or do we need to be given the Ka or Kb to find this?
by ashwathinair
Sun Dec 08, 2019 12:35 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligand
Replies: 1
Views: 24

Chelating Ligand

When we say a chelating ligand forms a ring around the central metal atom, do we mean that the metal atom is a part of the ring created? How do we know is something is a chelating ligand without knowing the drawing of it? Also, how do we know how to draw a chelating ligand knowing only the chemical ...
by ashwathinair
Sun Dec 08, 2019 12:31 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Compounds Structures
Replies: 1
Views: 34

Coordination Compounds Structures

How can we draw coordination compounds and know the VSEPR geometry of the compound? How can we tell the number of valence electrons on the transition metal in the center of the compound?
by ashwathinair
Sun Dec 08, 2019 12:26 am
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 60

Options to reduce acid rain

What are some ways we can reduce acid rain?
by ashwathinair
Sun Dec 08, 2019 12:23 am
Forum: Biological Examples
Topic: Important Complexes and their Biological Significance
Replies: 2
Views: 39

Important Complexes and their Biological Significance

Which complexes should we know in terms of biological significance (and which formulas should we memorize)?
by ashwathinair
Sun Dec 08, 2019 12:22 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Memorizing Ligands
Replies: 3
Views: 46

Memorizing Ligands

Which ligands should we know the formulas for by heart other than edta, en and ox?
by ashwathinair
Sat Dec 07, 2019 11:17 pm
Forum: Sigma & Pi Bonds
Topic: Hybridization Notation for Sigma and Pi Bonds
Replies: 1
Views: 22

Hybridization Notation for Sigma and Pi Bonds

How do we denote hybridization for sigma and pi bonds (something like sigma(C2sp, C2sp) or smth)?
by ashwathinair
Sat Dec 07, 2019 4:12 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Vs Pi
Replies: 10
Views: 62

Sigma Vs Pi

What are the main differences between sigma and pi bonds? What do we need to know and why are these differences important?
by ashwathinair
Sun Dec 01, 2019 8:04 pm
Forum: Conjugate Acids & Bases
Topic: Ligands
Replies: 12
Views: 57

Ligands

Exactly what is a ligand, and what do we need to know about ligands from lectures for the final?
by ashwathinair
Sun Dec 01, 2019 8:03 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base
Replies: 5
Views: 23

Re: Bronsted Acid and Base

Yes, bronsted definitions are based on proton accepting or donating (in contrast to lewis definitions based on electron accepting and donating).
by ashwathinair
Sun Dec 01, 2019 8:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for final exam
Replies: 8
Views: 43

Re: Studying for final exam

I've heard that the final can be very specific, so I think studying the notes or even the textbook in depth will really help.
by ashwathinair
Sun Dec 01, 2019 7:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma Bond
Replies: 10
Views: 42

Re: Sigma Bond

Sigma bonds are always one of the (up to three) bonds in a bond between two atoms. Specifically, there is one sigma in a single bond, one sigma in a double bond and one sigma in a triple bond.
by ashwathinair
Sun Dec 01, 2019 7:57 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 133

Re: Proton acceptor and proton donor?

Proton acceptors are bases and proton donors are acids
by ashwathinair
Sun Nov 24, 2019 11:27 pm
Forum: Resonance Structures
Topic: Resonance and Naming
Replies: 11
Views: 54

Re: Resonance and Naming

Resonance should not affect how we name a compound. However, having different versions of the compound's composition (such as through cisplatin and transplatin) can affect naming of a compound.
by ashwathinair
Sun Nov 24, 2019 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 32

Re: Bond Angles

This depends on if there is greater repulsion of bonds based on polarity and lone pairs. For example, H2O has slightly less than 109.5 degrees bond angle because the lone pairs on the oxygen repel the hydrogens away from the lone pairs and closer together to each other.
by ashwathinair
Sun Nov 24, 2019 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F.3
Replies: 3
Views: 15

Re: 2F.3

(a) 2 sigma bonds
(b) 2 sigma and 2 pi bonds

You can tell based on the lewis structure - single bonds are one sigma bond, double bonds are one sigma and one pi bond, and triple bonds are one sigma and two pi bonds.
by ashwathinair
Sun Nov 24, 2019 8:01 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 12
Views: 88

Re: Cisplatin

You should know cisplatin has a different structure than the trans version of the molecule because of sigma and pi bonds and the lewis structures of each.
by ashwathinair
Sun Nov 24, 2019 7:40 pm
Forum: Lewis Acids & Bases
Topic: Donor and Acceptor
Replies: 6
Views: 36

Re: Donor and Acceptor

Im pretty sure Lewis acids and bases are the same as regular acida dn bases. Lewis acids are proton donors and electron acceptors; lewis bases are proton acceptors and electron donors.
by ashwathinair
Sun Nov 17, 2019 8:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 6
Views: 37

Re: Molecular Shapes

I'd assume we need to memorize them all along with whatever electron configuration they go with for test 2.
by ashwathinair
Sun Nov 17, 2019 8:13 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Rod vs spherical shaped molecules
Replies: 8
Views: 58

Re: Rod vs spherical shaped molecules

Rod-shaped molecules have stronger London dispersion bonds because they have more surface area as well as more extreme electron clumping/shifting.
by ashwathinair
Sun Nov 17, 2019 8:11 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: Boiling Points
Replies: 7
Views: 39

Re: Boiling Points

Essentially, does this mean that boiling points have a direct correlation to electronegativity? I would think that if an atom is more electronegative then there is a stronger bond and thus a higher boiling point. I would say it is more about the difference in electronegativities between atoms in a ...
by ashwathinair
Sun Nov 17, 2019 8:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs non polar
Replies: 5
Views: 28

Re: Polar vs non polar

No - polarity depends more on whether the individual polarity between atoms in a single molecule cancel out or not. You cannot just assume that all molecules with lone pairs are polar as a whole.
by ashwathinair
Sun Nov 17, 2019 8:06 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 81

Re: Test 2 Topics

I'm pretty sure it's everything we covered after the midterm up until but not including hybridization.
by ashwathinair
Fri Nov 08, 2019 2:16 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: Monday Lecture
Replies: 2
Views: 34

Monday Lecture

Since we don't have school on Monday, is there anything we need to prepare for the Friday lecture or no?
by ashwathinair
Fri Nov 08, 2019 2:03 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 specificity
Replies: 3
Views: 15

Hydrogen bonding specificity

Why do hydrogen bonds only form between N, F and O? Why do they not form with elements in lower periods?
by ashwathinair
Fri Nov 08, 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: Interaction potential energy equations
Replies: 1
Views: 14

Interaction potential energy equations

Can someone explain how the interaction potential energy equations for different types of bonds work? I know that r is distance and alpha is polarizability, but how do the two interact to form the potential energy? Also, in what context would these equations be used?
by ashwathinair
Mon Nov 04, 2019 11:14 am
Forum: *Shrodinger Equation
Topic: Explanation of Shrodinger Equation and Hamiltonian
Replies: 3
Views: 66

Explanation of Shrodinger Equation and Hamiltonian

What do we need to understand conceptually about the Shrodinger equation and the Hamiltonian? How do these concepts interact, and do we need to know the equation/how to solve the Hamiltonian?
by ashwathinair
Sun Nov 03, 2019 10:35 pm
Forum: Photoelectric Effect
Topic: Dino Nuggets 8a
Replies: 1
Views: 35

Dino Nuggets 8a

At the review session on Friday, we went over 8a on the Dino Nuggets packet and found an equation derived from E(photon) = (threshold) + E(kinetic) that was equalled to frequency. Why did the equation need to be equalled to frequency? Could any other form of this equation still work to show the cons...
by ashwathinair
Fri Nov 01, 2019 7:49 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent character in ionic bonds
Replies: 3
Views: 40

Covalent character in ionic bonds

If a bond is ionic, why would it have more or less covalent character? Is this because the electron being pulled on by the cation has more or less polarizing power/the anion has more or less polarizability?
by ashwathinair
Fri Nov 01, 2019 7:46 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted electrons
Replies: 2
Views: 28

Distorted electrons

Exactly what does it mean for an electron to be distorted?
by ashwathinair
Fri Nov 01, 2019 7:44 pm
Forum: Sigma & Pi Bonds
Topic: Significance of sigma and pi bonds
Replies: 4
Views: 34

Significance of sigma and pi bonds

Exactly what is a sigma and pi bond, and how do we know which molecules have which type of bond?
by ashwathinair
Fri Nov 01, 2019 7:23 pm
Forum: Octet Exceptions
Topic: What are these?
Replies: 3
Views: 31

What are these?

Exactly what are the elements that are exceptions to the octet rule?
by ashwathinair
Fri Nov 01, 2019 7:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 40
Views: 1694

Re: Formal charge purpose

Compounds naturally want to be at their most stable form. By using formal charges and equalling them to 0, we are better able to find what is ACTUALLY the most stable structure of the compound so that we know what the structure of the compound actually is in nature.
by ashwathinair
Sun Oct 20, 2019 8:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exceptions to Orbital Rules
Replies: 8
Views: 63

Exceptions to Orbital Rules

What are the exceptions to the orbital rules we went over in class? I vaguely remember that d5 and d10 have different energy values so their orbital sequences are different.
by ashwathinair
Sun Oct 20, 2019 8:25 pm
Forum: *Particle in a Box
Topic: Explaining Particle in a Box
Replies: 4
Views: 74

Explaining Particle in a Box

I don't know if I just didn't label it down in my notes but I am not completely sure what this experiment entails. Would someone be able to explain particle in a box to me?
by ashwathinair
Sun Oct 20, 2019 8:23 pm
Forum: *Black Body Radiation
Topic: Understanding Black Body Radiation
Replies: 4
Views: 48

Understanding Black Body Radiation

Exactly what is black body radiation, and what do I need to know about it?
by ashwathinair
Sun Oct 20, 2019 8:19 pm
Forum: Properties of Light
Topic: Wave Properties of Sound
Replies: 4
Views: 41

Wave Properties of Sound

Just curious, would wave properties such as constructive and destructive interference apply to things other than light, like sound? If so, what would be an example of that?
by ashwathinair
Sun Oct 20, 2019 8:16 pm
Forum: Properties of Light
Topic: Week 3 Homework
Replies: 9
Views: 63

Re: Week 3 Homework

I'm pretty sure we are supposed to continue doing quantum homework.
by ashwathinair
Mon Oct 14, 2019 12:32 am
Forum: Properties of Light
Topic: Constants
Replies: 2
Views: 18

Constants

What do Planck's and Rydberg's constants mean in context of equations?
by ashwathinair
Mon Oct 14, 2019 12:30 am
Forum: Properties of Light
Topic: Memorizing Values for Tests
Replies: 3
Views: 15

Memorizing Values for Tests

Do we need to memorize values for c (speed), Planck's constant, Rydberg's constant, etc for the test? If so, what value would we use for each?
by ashwathinair
Mon Oct 14, 2019 12:28 am
Forum: Properties of Light
Topic: Variables and what they mean
Replies: 9
Views: 67

Variables and what they mean

I'm still a little confused about what lambda and v mean in equations, as I tend to get them mixed up.
by ashwathinair
Mon Oct 14, 2019 12:26 am
Forum: Properties of Light
Topic: Angstrom
Replies: 10
Views: 62

Re: Angstrom

If it isn't specified, I'm pretty sure Prof Lavelle will accept both, but nm is probably better because Angstrom is specific to bond lengths
by ashwathinair
Thu Oct 10, 2019 2:47 pm
Forum: Significant Figures
Topic: Sig Figs only for Decimal Points vs for all integers in the Answer
Replies: 5
Views: 61

Sig Figs only for Decimal Points vs for all integers in the Answer

I remember my TA saying something about rounding to the nearest decimal point for some calculations (maybe addition and subtraction??) and rounding to the lowest sig figs for other calculations (i think multiplication/division) and I'm not sure what the rule is. To clarify, if I was subtracting 100....
by ashwathinair
Thu Oct 10, 2019 2:41 pm
Forum: Significant Figures
Topic: Conflicting Sig Fig Advice
Replies: 3
Views: 59

Conflicting Sig Fig Advice

I'm seeing a lot of conflicting advice on the sig fig threads - because of rounding in the solutions manuals some people are saying that you should round to the nearest sig fig throughout calculations, but in my high school chem class I always learned to only round to sig figs for the final answer b...
by ashwathinair
Thu Oct 03, 2019 5:17 pm
Forum: Significant Figures
Topic: sig figs in calculations
Replies: 4
Views: 32

Re: sig figs in calculations

You only use them for your final answer because you want to use the most accurate calculations throughout the process of finding your answer instead of rounding at each sep and getting further and further away from the answer.
by ashwathinair
Thu Oct 03, 2019 5:12 pm
Forum: Significant Figures
Topic: subtracting with sig figs
Replies: 5
Views: 85

Re: subtracting with sig figs

When multiplying or dividing, you pay attention to the number with the least amount of sig figs, but when you do addition or subtraction, you pay attention to the number with the least values past the decimal point. Wait but we only have to round/truncate for the final answer to a question right? W...
by ashwathinair
Thu Oct 03, 2019 5:08 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.17
Replies: 6
Views: 65

Re: Fundamentals M.17

Samuel Tzeng 1H wrote:
Darren Nguyen 1F wrote:
Samuel Tzeng 1H wrote:Molar mass of XA = total mass - mass of H2O


How do I get total mass?


It's the molar mass of HA + XOH = (250+125)

Sorry I meant total molar mass - molar mass of H2O


Yeah this is lw more simple because (XOH + HA) - H2O = XA
by ashwathinair
Thu Oct 03, 2019 5:04 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.17
Replies: 6
Views: 65

Re: Fundamentals M.17

Molar mass of XA = Molar mass of A + Molar mass of X
Molar mass of A = (Molar mass of HA - 1.008 g/mol H)
Molar mass of X = (Molar mass of XOH - 17.008 g/mol OH)
by ashwathinair
Thu Oct 03, 2019 3:05 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 169
Views: 102923

Re: Rusty on High School Chem [ENDORSED]

I totally get this - I had my last chem class in sophomore year of high of school. So far when it comes to reviewing high school chem in Lavelle's class, I feel like the best resources for me have been the modules and doing ALL the homework problems. I think it's very important to do all the practic...
by ashwathinair
Thu Oct 03, 2019 2:48 pm
Forum: Significant Figures
Topic: Sig Figs in an Answer
Replies: 3
Views: 48

Sig Figs in an Answer

How can you tell how many sig figs to use when answering a chem calculation? Like I get that if there is an amount of, let's say, grams presented as part of the problem and that has three sig figs, your answer should have three sig figs, but in the case that there are multiple amounts presented as p...

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