Search found 72 matches
- Mon Mar 11, 2019 10:48 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: increasing pressure, what happens to concentration?
- Replies: 10
- Views: 2420
Re: increasing pressure, what happens to concentration?
When pressure increases, the gaseous molecules on both sides of the reaction increasingly collide with each other. In order to alleviate/compensate for these increased collisions, the reaction favors the side with the less number of moles of gaseous molecules.
- Mon Mar 11, 2019 10:45 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x
- Replies: 16
- Views: 3216
Re: ignoring x
You can ignore x when approximating (when K<10^-3), but make sure to check your work after to make sure x is indeed less than or equal to 5% deprotonation!
- Mon Mar 11, 2019 10:44 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 3
- Views: 358
Re: Le Chatelier's Principle
Le Chatelier's principle predicts how the equilibrium will shift in response to changes in volume, temperature, pressure, the addition or removal of gaseous molecules, etc.
- Fri Mar 08, 2019 10:12 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E˚ vs E
- Replies: 13
- Views: 15212
Re: E˚ vs E
E˚is under standard conditions (pressure=1 bar, concentration= 1 mol/L, etc.)
- Fri Mar 08, 2019 10:11 am
- Forum: Second Order Reactions
- Topic: Final
- Replies: 32
- Views: 2283
Re: Final
The final will cover all of the material we've learned this quarter.
- Fri Mar 08, 2019 10:10 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Lecture Notes Week 9 Wednesday (3/6)
- Replies: 3
- Views: 445
Re: Lecture Notes Week 9 Wednesday (3/6)
This is really helpful, thank you!
- Fri Mar 01, 2019 4:18 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Finding n for the equation ΔG⁰=-nFE⁰
- Replies: 8
- Views: 820
Re: Finding n for the equation ΔG⁰=-nFE⁰
When it says "write the balanced half reactions", does this mean balance O's and H's, as well as electrons?
Or is it just like Cu2+(aq)--> Cu(s)
Or is it just like Cu2+(aq)--> Cu(s)
- Wed Feb 27, 2019 4:37 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Thermodynamic Stability
- Replies: 2
- Views: 937
Re: Thermodynamic Stability
According to the textbook, the terms "stable" and "unstable" refer to the thermodynamic tendency of a substance to decompose into its elements. Furthermore, a thermodynamically stable compound just means a compound that has a negative standard Gibbs free energy of formation. So i...
- Wed Feb 27, 2019 4:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Why does reaction free energy depend on pressure and the equal constant?
- Replies: 3
- Views: 440
Why does reaction free energy depend on pressure and the equal constant?
On Outline 4, one of the bullet points listed says: "Understand why reaction free energy depends on pressure and the equilibrium constant". If someone could please clarify what this means, or direct me to the relevant section in the textbook (6th ed.) that talks about this, that would be m...
- Wed Feb 20, 2019 1:39 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous vs Not Spontaneous
- Replies: 7
- Views: 698
Re: Spontaneous vs Not Spontaneous
Delta G must be negative in order for a reaction to be spontaneous.
- Wed Feb 20, 2019 1:39 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Units of Gibbs Free Energy
- Replies: 5
- Views: 613
Re: Units of Gibbs Free Energy
Gibbs free energy is an extensive property.
- Wed Feb 20, 2019 1:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reverse Reaction
- Replies: 8
- Views: 763
Re: Reverse Reaction
Calculating K for reverse reactions involves taking the inverse of K for the forward reaction (1/K)
- Wed Feb 13, 2019 10:26 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Delta U equal to zero
- Replies: 2
- Views: 320
Re: Delta U equal to zero
Delta U = 0 for any isothermal expansion of an ideal gas, it doesn't have to be reversible.
- Wed Feb 13, 2019 10:25 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: How to calculate change in entropy due to change in temperature
- Replies: 1
- Views: 279
How to calculate change in entropy due to change in temperature
I believe this has been posted on the forum already, but I can't seem to find the thread, but for the change in entropy formula due to changes in temperature, do we use: delta S = nCln(T2/T1) or do we use delta S = Cln(T2/T1) I'm confused as to how we include the number of moles (n) into the formula.
- Tue Feb 12, 2019 9:59 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: entropy change
- Replies: 2
- Views: 266
Re: entropy change
Temperature is negatively proportional to entropy change. Thus, higher temperatures result in smaller values of the change in entropy.
- Tue Feb 12, 2019 9:57 am
- Forum: Calculating Work of Expansion
- Topic: 0 work vs no work
- Replies: 4
- Views: 475
Re: 0 work vs no work
They mean the same thing: essentially that no work is done by the system.
- Sun Feb 03, 2019 5:42 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: MIDTERM MATERIAL QUESTION
- Replies: 2
- Views: 292
MIDTERM MATERIAL QUESTION
Professor Lavelle mentioned the midterm would cover up to the end of entropy.
For the 6th edition textbook, what chapter/section does this correlate to? Are we responsible for Chapter 9 up to 9.10 (Overall Change in Entropy)?
For the 6th edition textbook, what chapter/section does this correlate to? Are we responsible for Chapter 9 up to 9.10 (Overall Change in Entropy)?
- Wed Jan 30, 2019 11:51 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework
- Replies: 9
- Views: 883
Re: Homework
I jumped around too, but found the textbook chapters to be helpful in gaining a conceptual understanding before trying to solve the problems.
- Wed Jan 30, 2019 11:50 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework #3
- Replies: 2
- Views: 303
Re: Homework #3
Yes we should complete the problems from the thermochemistry material.
- Fri Jan 25, 2019 1:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Lecture 1/23
- Replies: 3
- Views: 375
Lecture 1/23
Can anyone please fill me in on what Dr. Lavelle went over in class this past Wednesday? I wasn't able to make it due to traffic. Thank you in advance!
- Thu Jan 24, 2019 9:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 2
- Views: 236
Re: Test 1
I assume so, since we've done practice problems on it.
Follow up question: Does anyone know if we'll be tested on solutions of salts of polyprotic acids?
Follow up question: Does anyone know if we'll be tested on solutions of salts of polyprotic acids?
- Thu Jan 24, 2019 4:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 8
- Views: 741
Re: Test 1
For Test 1, what do we need to know about pH of weak acid/base and its salt? Should we just know how to solve it, or do we need a deeper conceptual knowledge of it? I'm a little confused because we didn't go over this in discussion last week. If someone could clarify, that'd be great!
- Thu Jan 24, 2019 4:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Tricks for identifying Strong/Weak Acids & Bases
- Replies: 6
- Views: 558
Re: Tricks for identifying Strong/Weak Acids & Bases
For Test 1, what should we know about the pH of weak acids and weak bases and its salt? We didn't go over this in discussion. Do we just need to know how to calculate it?
- Thu Jan 24, 2019 3:12 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: using Ka and Kb to predict strengths of acids and bases
- Replies: 3
- Views: 495
using Ka and Kb to predict strengths of acids and bases
I'm a bit confused on how we use Ka and Kb to predict the strengths of acids and bases. Particularly, how we use Kb In lecture, we learned that if Ka > 10^3, this indicates a strong acid and if Ka < 10^-3, this indicates a weak acid. Does this logic apply to bases too? So if Kb>10^3, does this indic...
- Wed Jan 23, 2019 2:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: How to know when to use partial pressure or molar concentrations?
- Replies: 4
- Views: 471
How to know when to use partial pressure or molar concentrations?
If the problem doesn't specify whether to use partial pressure or molar concentrations, how do we know which to use? For example, if a problem gives us the initial molar concentrations of the gaseous reactants, but doesn't specify whether to use partial pressures or concentrations, do we automatical...
- Wed Jan 23, 2019 2:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Kc
- Replies: 3
- Views: 266
Re: K vs Kc
In Example 11.7 (Calculating the equilibrium composition by approximation) of the 6th edition textbook, the problem tells us to solve for partial pressures. I tried using both partial pressures and molar concentrations to solve this problem, but when I used the concentration, it gave me a different ...
- Thu Jan 17, 2019 8:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Weak and Strong Acids and Bases [ENDORSED]
- Replies: 2
- Views: 237
Re: Weak and Strong Acids and Bases [ENDORSED]
Questions will give us the pH or some other measures that will allow us to calculate the pH or pOH of the substance.
- Tue Jan 15, 2019 5:31 pm
- Forum: General Science Questions
- Topic: Lecture Powerpoints
- Replies: 9
- Views: 708
Re: Lecture Powerpoints
Thank you!!! Much appreciated.
- Mon Jan 14, 2019 3:33 pm
- Forum: General Science Questions
- Topic: Lecture Powerpoints
- Replies: 9
- Views: 708
Re: Lecture Powerpoints
Would anyone be able to inform me of what we covered in lecture today 11/14?
I wasn't able to make it. Thanks in advance!
I wasn't able to make it. Thanks in advance!
- Wed Jan 09, 2019 9:55 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Discussion Points
- Replies: 3
- Views: 220
Re: Discussion Points
The TA's go through the discussion forum at the end of the quarter, and as long as you post at least 3 times a week, you will get the full 30 points for the chemistry community discussion forum!
- Tue Jan 08, 2019 6:56 pm
- Forum: Ideal Gases
- Topic: Solid/Liquid in Reactions
- Replies: 4
- Views: 204
Re: Solid/Liquid in Reactions
Solids aren't included in the equilibrium constant because there is no such thing as "concentration of a solid".
For liquids, liquids act as a solvent, and the change in concentration of a solvent is insignificant. Thus, we don't include pure liquids in the equilibrium constant.
For liquids, liquids act as a solvent, and the change in concentration of a solvent is insignificant. Thus, we don't include pure liquids in the equilibrium constant.
- Tue Jan 08, 2019 6:53 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: hw questions - points
- Replies: 9
- Views: 663
Re: hw questions - points
Homework questions are a separate category. We get 7 points a week for homework and 3 points a week for chemistry community posts, given that you do all of them.
- Tue Jan 08, 2019 11:21 am
- Forum: Student Social/Study Group
- Topic: lecture notes first day of class
- Replies: 2
- Views: 328
Re: lecture notes first day of class
Professor Lavelle usually doesn't post the lecture slides, but if you look at the audio-visual topics, you should be able to find a video that covers what we went over in class yesterday.
- Fri Dec 07, 2018 3:50 pm
- Forum: Lewis Acids & Bases
- Topic: How to tell if an ion is acidic or basic?
- Replies: 2
- Views: 286
Re: How to tell if an ion is acidic or basic?
Will we need to know how to do this for the final?
- Fri Dec 07, 2018 3:48 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Ranking strong acids and bases
- Replies: 4
- Views: 734
Re: Ranking strong acids and bases
For binary acids, the more polar the H-A bond/the greater the electronegativity of A, the stronger the acid H-A the weaker the H-A bond, the stronger the acid For oxoacids, the greater the electronegativity of the central atom, the stronger the oxoacid the greater the # of oxygen atoms attached to t...
- Fri Dec 07, 2018 3:46 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH on final
- Replies: 5
- Views: 1407
Re: pH on final
Do we need to know how to calculate the pH of salt solutions with an acidic cation or a basic anion? (this is from 12.13 in the 6th edition)
- Fri Dec 07, 2018 3:45 pm
- Forum: Conjugate Acids & Bases
- Topic: Cojugate Acids and Bases
- Replies: 10
- Views: 2026
Re: Cojugate Acids and Bases
You add an H+ ion to a base to make a conjugate acid, and remove an H+ ion from an acid to make a conjugate base.
- Tue Nov 27, 2018 3:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 38
- Views: 2491
Re: Test 3
Hi guys.
What do we need to know about Acids and Bases for Test 3?
What do we need to know about Acids and Bases for Test 3?
- Mon Nov 26, 2018 11:23 am
- Forum: Student Social/Study Group
- Topic: Test 3
- Replies: 6
- Views: 912
Re: Test 3
Yes, Test 3 will pick up where the Midterm left off.
- Mon Nov 26, 2018 11:22 am
- Forum: Dipole Moments
- Topic: Polarizability vs Polarizing power
- Replies: 8
- Views: 670
Re: Polarizability vs Polarizing power
You should refer to page 79 of the textbook for a summary of the 2 concepts!
- Mon Nov 26, 2018 11:20 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: Water as a solvent
- Replies: 2
- Views: 502
Re: Water as a solvent
Water is considered the universal solvent because: Water molecules carry partial charges (the hydrogen side of the water molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge). This structure allows water molecules to dissociate ionic com...
- Tue Nov 20, 2018 11:40 pm
- Forum: Hybridization
- Topic: Unhybridized orbitals
- Replies: 10
- Views: 1362
Re: Unhybridized orbitals
Unhybridized orbitals refer to your standard s, p, d, f orbitals. Hybridized orbitals pertain to electrons that can exist between these orbitals. Someone correct me if I'm wrong?
- Tue Nov 20, 2018 11:39 pm
- Forum: Lewis Structures
- Topic: Midterm question
- Replies: 8
- Views: 661
Re: Midterm question
They passed the midterms back after lecture last Wednesday.
- Tue Nov 20, 2018 11:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Wednesday Class
- Replies: 19
- Views: 1369
Re: Thanksgiving Wednesday Class
There is no lecture tomorrow.
- Wed Nov 14, 2018 5:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades
- Replies: 5
- Views: 461
Re: Grades
The syllabus says the class isn't curved, but I believe Dr. Lavelle may use a slight curve once all the scores are in.
- Wed Nov 14, 2018 5:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Q4B
- Replies: 4
- Views: 499
Re: Midterm Q4B
Electron diffraction supports the idea of light having wave-like properties, in addition to particle-like properties. Thus, De Broglie's Hypothesis is best supported by this.
- Wed Nov 14, 2018 11:47 am
- Forum: Student Social/Study Group
- Topic: Test 3
- Replies: 6
- Views: 912
Re: Test 3
Does anyone know if we get our midterms back after lecture today?
- Thu Nov 08, 2018 3:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Which chapters can we do for homework?
- Replies: 3
- Views: 505
Which chapters can we do for homework?
Can we do problems from Outline 3 for this week's hw?
- Mon Nov 05, 2018 1:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm Material
- Replies: 3
- Views: 450
Re: Midterm Material
Also, what should we know about Lewis acids and bases?
- Mon Nov 05, 2018 1:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm Material
- Replies: 3
- Views: 450
Midterm Material
Dr. Lavelle mentioned that we are only responsible for Bonding up to 3.11. However Outline includes concepts about electronegativity and ionic and covalent bond length. Does this mean that electronegativity, strengths of ionic and covalent bonds, bond lengths, covalent bond dissociation energy, etc....
- Mon Nov 05, 2018 10:43 am
- Forum: Ionic & Covalent Bonds
- Topic: Coloumb potential energy on the midterm?? [ENDORSED]
- Replies: 1
- Views: 188
Coloumb potential energy on the midterm?? [ENDORSED]
Will we need to know how to use the formula for coloumb potential energy of interactions for the midterm today??
It's the formula that's in Chapter 3.4 of the 6th edition.
It isn't stated on the outline, but just wanted to make sure.
It's the formula that's in Chapter 3.4 of the 6th edition.
It isn't stated on the outline, but just wanted to make sure.
- Mon Nov 05, 2018 7:57 am
- Forum: Sigma & Pi Bonds
- Topic: Midterm1
- Replies: 10
- Views: 1113
Re: Midterm1
Where is our midterm held today???
- Thu Nov 01, 2018 9:08 am
- Forum: General Science Questions
- Topic: Calculator for midterm
- Replies: 4
- Views: 522
Re: Calculator for midterm
You can also post on the Free and For sale page on Facebook and see if anyone is renting or selling theirs!
- Thu Nov 01, 2018 9:06 am
- Forum: *Shrodinger Equation
- Topic: Schrodinger's Equation
- Replies: 6
- Views: 1241
Re: Schrodinger's Equation
You should also know the relationship between wave function and probability density (wavefunction^2).
- Tue Oct 30, 2018 3:24 pm
- Forum: Student Social/Study Group
- Topic: Midterm- what do we need to know about atomic orbitals
- Replies: 2
- Views: 331
Midterm- what do we need to know about atomic orbitals
For our upcoming midterm, what should we know about atomic orbitals? In Outline 2, it says to be able to describe the interpretation of atomic orbitals in terms of probability. Does this mean we should know the formulas for spherical polar coordinates, radical wave function, angular wave function, e...
- Thu Oct 25, 2018 8:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Material?
- Replies: 2
- Views: 300
Test 2 Material?
Will we be tested on Shrodinger's equation for Test 2?
- Thu Oct 25, 2018 9:06 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra Module #37
- Replies: 2
- Views: 476
Re: Atomic Spectra Module #37
Is this from Outline 2 or 3?
- Thu Oct 25, 2018 9:04 am
- Forum: Administrative Questions and Class Announcements
- Topic: HW for this week [ENDORSED]
- Replies: 4
- Views: 524
Re: HW for this week [ENDORSED]
I am wondering this too.
- Wed Oct 24, 2018 11:08 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: How do I identify excited state through the electronic configuration
- Replies: 5
- Views: 4933
Re: How do I identify excited state through the electronic configuration
Would anyone be able to share their notes from monday lecture with me? I wasn't able to make it. If so, if you could email me at sarah27kang@gmail.com, it'd be greatly appreciated!
- Tue Oct 23, 2018 11:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TEST 3 during Thanksgiving week?
- Replies: 5
- Views: 574
Re: TEST 3 during Thanksgiving week?
Oh okay thank you!
- Tue Oct 23, 2018 9:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: TEST 3 during Thanksgiving week?
- Replies: 5
- Views: 574
TEST 3 during Thanksgiving week?
For Test 3 that starts in discussion section November 20th, does anyone know when the Thursday/Friday sections will take the test, since it's Thanksgiving break starting Thursday?
Thanks!
Thanks!
- Thu Oct 18, 2018 12:16 am
- Forum: Photoelectric Effect
- Topic: Test #2
- Replies: 9
- Views: 879
Re: Test #2
Yes, Teest #2 covers topics on Outline #2.
- Tue Oct 16, 2018 9:12 am
- Forum: *Particle in a Box
- Topic: Hw assignment?
- Replies: 7
- Views: 1266
Re: Hw assignment?
Yes, we are still in the Quantum section! He mentioned in lecture not to do questions from the Fundamentals section, for the Week 3 homework.
- Tue Oct 16, 2018 9:11 am
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 15100
Re: Note Taking
I think it's best to take notes by hand, and then after lecture that night, re-read your notes and highlight important topics as well as read confusing topics in the textbook.
- Tue Oct 16, 2018 9:09 am
- Forum: Administrative Questions and Class Announcements
- Topic: Writing in Pen
- Replies: 13
- Views: 963
Re: Writing in Pen
They sell erasable pens on Amazon. I'd also recommend bringing white-out just in case you need to correct something!
- Mon Oct 08, 2018 5:50 pm
- Forum: Properties of Light
- Topic: Difference between "intensity of light" and "frequency of light"
- Replies: 3
- Views: 9108
Difference between "intensity of light" and "frequency of light"
In the equation, E=hv where v = frequency, what is the difference between intensity and frequency of light? In lecture, Professor Lavelle mentioned increasing the intensity of the light does not increase the energy of the individual photon. So, frequency and intensity can't refer to the same thing, ...
- Mon Oct 08, 2018 2:07 pm
- Forum: Student Social/Study Group
- Topic: Missed today's lecture (10/8) could anyone share their notes?
- Replies: 3
- Views: 352
Missed today's lecture (10/8) could anyone share their notes?
Hi all,
I was unable to attend lecture today due to a family event back home. Would anyone be willing to share a picture of their notes with me so that I can catch up on what I missed?
If so, could you please text me at 805-708-6286?
Thank you.
I was unable to attend lecture today due to a family event back home. Would anyone be willing to share a picture of their notes with me so that I can catch up on what I missed?
If so, could you please text me at 805-708-6286?
Thank you.
- Sun Oct 07, 2018 12:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??
- Replies: 5
- Views: 1134
Re: WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??
Hi Christine,
Okay thanks so would the TI-30 calculators be allowed? Scientific calculators are ones that still allow us to calculate 6.022X10^23 and exponents, right?
Okay thanks so would the TI-30 calculators be allowed? Scientific calculators are ones that still allow us to calculate 6.022X10^23 and exponents, right?
- Sun Oct 07, 2018 11:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??
- Replies: 5
- Views: 1134
WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??
Hi. For Chem 14A, are we allowed to use TI-84 calculators on the exams?
If not, could somebody please tell me which calculators are allowed? TI 30 calculators perhaps?
Thank you!
If not, could somebody please tell me which calculators are allowed? TI 30 calculators perhaps?
Thank you!
- Thu Oct 04, 2018 4:24 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Conversion of grams to moles
- Replies: 4
- Views: 414
Re: Conversion of grams to moles
Yes, you need to take into account subscripts when finding the molar mass of a compound. For example, in order to find the molar mass of CO2, you would add the molar mass of carbon plus twice the molar mass of oxygen. This gives you the molar mass of CO2. You can then use the molar mass of CO2 and t...
- Thu Oct 04, 2018 4:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: chemical formulas
- Replies: 4
- Views: 2053
Re: chemical formulas
Cl on its own would refer to the ion form (Cl-). Cl2, along with N2, H2, and O2 are all gaseous forms of the elements.
- Thu Oct 04, 2018 12:32 pm
- Forum: Significant Figures
- Topic: Sig Fig's in Problem E.21.d
- Replies: 3
- Views: 427
Sig Fig's in Problem E.21.d
On Question E.21.d of the 6th edition textbook, the first step is to calculate the molar mass of glucose (C6H12O6). I am confused as to why the final molar mass contains 5 sig fig's and not 4. Here is my work: 6(12.011) + 12(1.008) + 6(15.999) = 180.2 g/mol The textbook solutions states that the ans...