Search found 98 matches
- Sun Mar 15, 2020 8:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic and Voltaic
- Replies: 5
- Views: 466
Galvanic and Voltaic
What is the difference between the two? Does it affect which is anode or cathode and how if so?
- Sat Mar 14, 2020 9:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading Scale
- Replies: 16
- Views: 1151
Re: Grading Scale
Yes I believe it should be the same where to get a C- you need 50% to pass.
- Sat Mar 14, 2020 9:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final and Work
- Replies: 2
- Views: 386
Final and Work
Since the final will be on ccle does that mean that we just input an answer or does work actually have to be shown? Cause without work there is no chance to get at least partial credit.
- Fri Mar 13, 2020 3:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 796
Final
Is the final up already? If so where would I find it? Is it due by a certain day?
- Tue Mar 10, 2020 8:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Review Sessions
- Replies: 1
- Views: 218
Review Sessions
Since classes are cancelled does that mean that review sessions are cancelled as well? Will those also be online?
- Sun Mar 08, 2020 5:13 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K < >
- Replies: 8
- Views: 576
K < >
How do we determine whether k is < or > 1? Also, why is it important?
- Sun Mar 08, 2020 5:08 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing a reaction
- Replies: 5
- Views: 407
Balancing a reaction
In the test, I remember that they asked to balance the reaction but how do I do that?
- Sun Mar 08, 2020 4:59 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: How to determine Q
- Replies: 4
- Views: 373
How to determine Q
In the Nernst Equation there is Q and I know that you divide one on top of the other but how do I know which is on top of the other?
- Sun Mar 08, 2020 4:55 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing and Reducing
- Replies: 5
- Views: 387
Oxidizing and Reducing
How do we know which one is being oxidized or reduced if they both look like they both received the same amount of electrons in half reactions?
- Thu Mar 05, 2020 7:17 pm
- Forum: Balancing Redox Reactions
- Topic: Values of Andode and Cathode
- Replies: 8
- Views: 612
Values of Andode and Cathode
Are we supposed to know how to determine the value of the anode and the cathode? If so how do we do that?
- Sun Mar 01, 2020 5:30 pm
- Forum: Van't Hoff Equation
- Topic: Deriving [ENDORSED]
- Replies: 2
- Views: 281
Deriving [ENDORSED]
How do we derive the van't hoff equation when they say K1 and K2 exists?
- Sun Mar 01, 2020 5:25 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt bridge
- Replies: 2
- Views: 239
Salt bridge
What is the purpose of the salt bridge in the cell diagrams?
- Sun Mar 01, 2020 5:23 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: N value
- Replies: 7
- Views: 499
N value
I know that n is the electrons but is it the one that is shown on the reactions when it says for example 2e-? Would the n be 2 in that case?
- Sun Mar 01, 2020 5:21 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Equations
- Replies: 2
- Views: 245
Equations
What is a good technique for remembering this equation and what each variable stands for?
- Sun Mar 01, 2020 5:08 pm
- Forum: Balancing Redox Reactions
- Topic: Anode and Cathode
- Replies: 8
- Views: 585
Anode and Cathode
Are we given when a reaction is anode or cathode or are we supposed to be able to determine that by ourselves? If so, how do we determine which is which?
- Sun Feb 23, 2020 8:54 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Work
- Replies: 5
- Views: 398
Work
How do we determine whether work has been done on a system?
- Sun Feb 23, 2020 8:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 5
- Views: 406
Test 2
What outline will test 2 be covering? Is it up to what we learned Friday or will in continue to week 8?
- Sun Feb 23, 2020 8:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Extra Credit
- Replies: 17
- Views: 1047
Re: Extra Credit
That I know of Lavelle does not give any extra credit opportunities. Its mostly just all the points that you find out of the syllabus to reach the 500 points.
- Sun Feb 23, 2020 7:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Half reactions
- Replies: 13
- Views: 807
Re: Half reactions
A half reaction is either the oxidation or reduction reaction that makes up a redox reaction.
- Sun Feb 23, 2020 7:47 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: chemistry community posts
- Replies: 12
- Views: 687
Re: chemistry community posts
Its 5 posts per week and the week ends on Sunday but at the end of the quarter you should have 50 posts total.
- Sun Feb 16, 2020 7:26 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase changes
- Replies: 8
- Views: 724
Phase changes
How do we determine when there has been a phase change?
- Sun Feb 16, 2020 7:15 pm
- Forum: Calculating Work of Expansion
- Topic: Irreversible and Reversible problem
- Replies: 4
- Views: 419
Irreversible and Reversible problem
How do we approach a problem when we are asked to look for the irreversible and reversible expansion? Is there different equations used for both expansions?
- Sun Feb 16, 2020 7:13 pm
- Forum: Calculating Work of Expansion
- Topic: Irreversible and Reversible Expanision
- Replies: 9
- Views: 719
Irreversible and Reversible Expanision
What is irreversible and reversible expansion? How do we know which is which when faced with a problem?
- Sun Feb 16, 2020 7:10 pm
- Forum: Calculating Work of Expansion
- Topic: Work Equation
- Replies: 6
- Views: 646
Work Equation
Something I have been struggling with is determining with work equation to use so how do I determine which work equation to use?
- Sun Feb 16, 2020 7:06 pm
- Forum: Balancing Redox Reactions
- Topic: Seperating Redoz RXNS
- Replies: 7
- Views: 407
Seperating Redoz RXNS
It was said that it is easier to separate a redox reaction into half reactions but what does half reactions mean? Are reactions just cut in half?
- Sun Feb 09, 2020 9:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated// Energy
- Replies: 11
- Views: 635
Re: Isolated// Energy
Since an isolated system has no exchanges with its surroundings, this means that the isolated system can not have a change in energy.
- Sun Feb 09, 2020 9:24 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: X is to small
- Replies: 8
- Views: 532
X is to small
I read on chemistry community that the x is ignored if the K Is less than 10^-3 but is K always going to be given? If not how will I know when the x should be ignored?
- Sun Feb 09, 2020 9:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: closed vs isolated
- Replies: 10
- Views: 622
Re: closed vs isolated
A closed system is when energy can exchange with its surroundings, but an isolated system is when nothing exchanges with its surroundings.
- Sun Feb 09, 2020 9:13 pm
- Forum: Ideal Gases
- Topic: Gas constant
- Replies: 10
- Views: 575
Gas constant
I know that in PV=nRT there is a gas constant but how do you determine which one is suitable for the problem?
- Sun Feb 09, 2020 8:53 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ice tables
- Replies: 2
- Views: 123
Ice tables
Is it possible that it can be given in a problem two different molarities? Does it matter when doing ice tables?
- Sun Feb 02, 2020 8:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase changes
- Replies: 3
- Views: 194
Phase changes
How do phase changes affect a reaction? How do they matter?
- Sun Feb 02, 2020 8:48 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressure
- Replies: 7
- Views: 452
Partial Pressure
How do we do partial pressure? What is the difference between partial pressure and regular pressure?
- Sun Feb 02, 2020 8:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Quadratic Equation
- Replies: 5
- Views: 471
Quadratic Equation
How do we use the quadratic equation? Which values go into each variable?
- Sun Feb 02, 2020 8:24 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 5506
PV=nRT
What does each letter stand for?
- Sun Feb 02, 2020 8:11 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Shifts
- Replies: 6
- Views: 444
Shifts
How do we know which way the equilibrium will shift?
- Sun Jan 26, 2020 7:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy is said to be additive
- Replies: 10
- Views: 379
Enthalpy is said to be additive
What does it mean for something to be additive?
- Sun Jan 26, 2020 7:02 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's law
- Replies: 2
- Views: 101
Hess's law
How do we add reactions to obtain net reaction? For example during lecture two of the reactions were N2 and 2NO equal N2 so how does that work?
- Thu Jan 23, 2020 6:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Chemical equation
- Replies: 5
- Views: 266
Chemical equation
How are we supposed to make the chemical equation on our own when solving for concentration and down ice tables?
- Thu Jan 23, 2020 6:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Value of Ka, Kw, Kb
- Replies: 5
- Views: 190
Value of Ka, Kw, Kb
Do they have specific values? I was doing problems 6D.15 and 6D.17 and they both have the same values.
- Thu Jan 23, 2020 6:32 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Value of X
- Replies: 7
- Views: 238
Value of X
How do we find the value of x when it is not given?
- Sun Jan 19, 2020 6:01 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Temperature
- Replies: 5
- Views: 210
Temperature
Why does temperature (endothermic & exothermic) matter? How do we know from solving a problem if it is endothermic of exothermic?
- Sun Jan 19, 2020 6:00 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: X was ignored
- Replies: 27
- Views: 1215
X was ignored
In my discussion, when solving for x after doing the ice table we got x^2/(.10-x). Then when we plugged in the Ka= 1.8 x 10^-5 so the equation was 1.80 x 10^-5 = x^2/.10. Why is it that the -x was ignored?
- Sun Jan 19, 2020 5:52 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Tables
- Replies: 13
- Views: 534
ICE Tables
Why is it that H2O gets cancelled out when doing ice tables?
- Thu Jan 16, 2020 8:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: H3O+
- Replies: 4
- Views: 168
H3O+
Is there a reason we use H3O+ or is it just something we have to use for acids?
- Thu Jan 16, 2020 6:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A.19
- Replies: 2
- Views: 134
6A.19
In problem 6A.19 part c in the textbook it says its 3.1 mol/L however in the solutions manual it gives the value 3.1 x 10^-3. Is there a reason for that or is it just a solutions manual error?
- Sun Jan 12, 2020 4:47 pm
- Forum: Ideal Gases
- Topic: Kc and Kp
- Replies: 8
- Views: 327
Kc and Kp
What is the difference between using Kc and Kp?
- Sun Jan 12, 2020 4:43 pm
- Forum: Ideal Gases
- Topic: R in PV=nRT
- Replies: 34
- Views: 7173
Re: R in PV=nRT
The R in PV=nRT stands for the gas constant and its units are 8.314 J/mol·K.
- Sun Jan 12, 2020 4:41 pm
- Forum: Ideal Gases
- Topic: P=(n/v)RT
- Replies: 12
- Views: 1081
P=(n/v)RT
I see that there is the equation P= (n/v)RT which is connected to PV=nRT but why is it that V (volume) is not divided by the whole nRT? Since its only dividing by n (number of moles).
- Thu Jan 09, 2020 5:53 pm
- Forum: Ideal Gases
- Topic: 5G.11
- Replies: 6
- Views: 243
5G.11
Is reaction Quotient (Q) the same thing as K? If so then how is my answer not the same as what I would get for K? How do you solve if you don't have any values?
- Thu Jan 09, 2020 5:27 pm
- Forum: Ideal Gases
- Topic: Solving for K (coefficients)
- Replies: 11
- Views: 617
Solving for K (coefficients)
When solving for K to the coefficients have to be in a particular order?
- Thu Jan 09, 2020 5:19 pm
- Forum: Ideal Gases
- Topic: Solving for K when only given balanced equation [ENDORSED]
- Replies: 6
- Views: 279
Solving for K when only given balanced equation [ENDORSED]
When solving for K when you don't have any values is there a reason why we use P?
- Sat Dec 07, 2019 8:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
- Replies: 115
- Views: 14770
Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
In number 34 in the packet to get the molOH we multiplied the Mol of CaO times 2 mol OH why was it 2 mol of OH but H+ was only one?
- Sat Dec 07, 2019 3:43 pm
- Forum: Hybridization
- Topic: Hybradization
- Replies: 3
- Views: 394
Hybradization
In C5H5NO2 it mention that one of the carbons has a hybridization of 2sp^2. What does the 2 mean? Can we just put sp^2 or does it have to be 2sp^2?
- Sat Dec 07, 2019 3:36 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculations for KA
- Replies: 1
- Views: 91
Calculations for KA
Can someone explain to me how KA works and how this helps us find the pH?
- Sat Dec 07, 2019 3:27 pm
- Forum: Naming
- Topic: Memorization
- Replies: 4
- Views: 387
Memorization
Can anyone recommend me some strategies for memorizing the names of the ligands?
- Thu Dec 05, 2019 7:57 pm
- Forum: General Science Questions
- Topic: Tightly bound
- Replies: 2
- Views: 465
Tightly bound
How can you identify which pair of atoms are most tightly bound?
- Thu Dec 05, 2019 7:55 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids and bases
- Replies: 1
- Views: 90
Acids and bases
How do you know when the molecule given is an acid or a base? Or does it always have to be given?
- Sun Dec 01, 2019 7:09 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis and Bronsted
- Replies: 2
- Views: 155
Lewis and Bronsted
What is the difference between Lewis acids and bases and Bronsted acid and bases?
- Sun Dec 01, 2019 6:57 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Neutralization
- Replies: 7
- Views: 495
Re: Neutralization
It is most important to know that neutralization is a reaction between acid and base that ends with salt and water.
- Sun Dec 01, 2019 6:55 pm
- Forum: Lewis Acids & Bases
- Topic: Bases
- Replies: 4
- Views: 306
Bases
It was discussed that a strong bases is completely ionized in water and weak bases are no completely ionized in wate. How do we know which one is completely ionized and which is not?
- Sun Dec 01, 2019 6:46 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH
- Replies: 4
- Views: 302
Calculating pH
How do we calculate the pH of acids and base? I know there is log involved but I don't get how to use it.
- Sun Dec 01, 2019 6:31 pm
- Forum: Student Social/Study Group
- Topic: Final Studying
- Replies: 8
- Views: 399
Final Studying
I somewhat understand some of the concepts but applying them is what I find difficult. What would you guys suggest I do to help me study for the final exam?
- Sun Nov 24, 2019 4:17 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 2
- Views: 237
Ligands
Can someone please explain to me what are ligands?
- Sun Nov 24, 2019 4:15 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Drawing sigma & Pi bonds
- Replies: 7
- Views: 681
Drawing sigma & Pi bonds
When drawing the sigma and pi bonds is it basically just circling the bonds and mentioning its hybridization?
- Sun Nov 24, 2019 4:06 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE
- Replies: 6
- Views: 569
AXE
Does the AXE formula only give us the shape of the molecule? Does it serve any other purpose?
- Sun Nov 24, 2019 4:02 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 13
- Views: 740
Sigma and Pi bonds
I know that a double bond it is a sigma bond and a pi bond, but when drawing it on the actual molecule do you just draw a pi bond?
- Sun Nov 24, 2019 3:55 pm
- Forum: Hybridization
- Topic: Hybrid orbitals
- Replies: 5
- Views: 350
Hybrid orbitals
How do we determine hybrid orbitals? Is it just by looking at the Lewis structure or is it by looking at the valence shells?
- Sun Nov 17, 2019 6:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 3
- Views: 242
VSEPR
How is the VSEPR model used in determining shape? Is it also used in finding the angles?
- Sun Nov 17, 2019 6:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 5
- Views: 315
VSEPR
How is the VSEPR model used in determining shape? Is it also used in finding the angles?
- Sun Nov 17, 2019 6:23 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 2
- Views: 168
Sigma and Pi bonds
Can someone please explain to me what are sigma and pi bonds?
- Sun Nov 17, 2019 6:20 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion
- Replies: 2
- Views: 238
Repulsion
How does repulsion help influence the molecular shape?
- Sun Nov 17, 2019 6:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape of XeF4
- Replies: 2
- Views: 182
Shape of XeF4
In Friday's lecture Professor Lavelle discussed the structure/shape of Xenon Tetrafluoride but he showed it in an octahedral shape. How do we know that its going to be in that shape?
- Sun Nov 17, 2019 6:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Prediction of Angles
- Replies: 4
- Views: 310
Prediction of Angles
How are we supposed to predict the bond angles? Do we use the shape name or the VSEPR model?
- Sun Nov 03, 2019 6:48 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 15
- Views: 871
Resonance structures
What are resonance structures?
- Sun Nov 03, 2019 6:47 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: The equation
- Replies: 3
- Views: 271
The equation
I know that the L in the equation means the # of electrons in a lone pair but what is a lone pair?
- Sun Nov 03, 2019 6:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent
- Replies: 5
- Views: 258
Ionic and Covalent
What is the difference between covalent and ionic bonds?
- Sun Nov 03, 2019 6:35 pm
- Forum: Lewis Structures
- Topic: Single bond
- Replies: 2
- Views: 167
Single bond
Does each single bond mean 2 electrons?
- Sun Nov 03, 2019 6:32 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge and Energy
- Replies: 4
- Views: 363
Formal Charge and Energy
How does formal charge show us which has the highest energy?
- Sat Oct 26, 2019 10:02 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Bonds
- Replies: 5
- Views: 293
Ionic and Covalent Bonds
How do you know when it is ionic vs covalent?
- Sat Oct 26, 2019 9:50 pm
- Forum: Resonance Structures
- Topic: Bond lengths
- Replies: 5
- Views: 189
Bond lengths
Is there a way to find the bond lengths?
- Sat Oct 26, 2019 9:47 pm
- Forum: Sigma & Pi Bonds
- Topic: Double bond
- Replies: 15
- Views: 621
Double bond
How do you know when to double bond?
- Sat Oct 26, 2019 9:33 pm
- Forum: Lewis Structures
- Topic: Drawing the Lewis Structure
- Replies: 2
- Views: 131
Drawing the Lewis Structure
Is there a specific way that we have to draw the structure?
- Sat Oct 26, 2019 8:59 pm
- Forum: Lewis Structures
- Topic: Charges
- Replies: 2
- Views: 86
Charges
I know that when there is a cation you have to remove one electron and when its an anion you should add one. When do I know to do that if you have both a cation and an anion?
- Sun Oct 20, 2019 2:26 pm
- Forum: Properties of Light
- Topic: N levels
- Replies: 8
- Views: 514
N levels
Can someone explain to me what are the n levels that Dr. Lavelle is writing on the board in lectures?
- Sun Oct 20, 2019 1:09 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron Configuration
- Replies: 1
- Views: 141
Electron Configuration
Can someone explain to me how electron configuration works and how to use s, p, d, and f?
- Sun Oct 20, 2019 12:58 pm
- Forum: Properties of Light
- Topic: Problem 1.27
- Replies: 2
- Views: 194
Re: Problem 1.27
a) To find the wavelength you usethe equation wavelength=c/v, c is the speed of light (2.997 x 10^8 ms^-1).
b) To find the frequency you use the equation v= c/frequency which was given to you (421 nm).
b) To find the frequency you use the equation v= c/frequency which was given to you (421 nm).
- Sun Oct 20, 2019 12:27 pm
- Forum: Properties of Light
- Topic: Unit for Wavelength
- Replies: 34
- Views: 2609
Re: Unit for Wavelength
The unit for wavelength is in meters but sometimes for some problems nanometers is used.
- Sun Oct 20, 2019 12:20 pm
- Forum: Properties of Light
- Topic: 1A.9 Energy of Photon
- Replies: 12
- Views: 514
Re: 1A.9 Energy of Photon
To calculate for the energy you use the equation E=hv, h being Planck's constant.
- Sun Oct 13, 2019 8:19 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1A.11
- Replies: 2
- Views: 145
1A.11
I am having trouble with this question: In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer Series or Lyman series) What is the common to the lines within a series that makes grouping them together logical? Can someone exp...
- Sun Oct 13, 2019 8:06 pm
- Forum: DeBroglie Equation
- Topic: Problem 1B.7
- Replies: 3
- Views: 144
Re: Problem 1B.7
In order to answer part b of this problem, you first have to convert the 5.00 mg of sodium then divide the grams of sodium by the molar mass of sodium. Once you do that then you have to multiply this number by Avogadro's number to convert it into moles. After this, you multiply this value by the num...
- Sun Oct 13, 2019 7:59 pm
- Forum: Einstein Equation
- Topic: 1B.7 Part c
- Replies: 3
- Views: 235
Re: 1B.7 Part c
To solve this problem you have to multiply Avogadro's number by the value you got in Part a of the answer and you should get your answer. You are using Avogadro's number because you are given that it is only one mol.
- Sun Oct 13, 2019 7:44 pm
- Forum: Properties of Light
- Topic: Balmer and Lymann Series
- Replies: 1
- Views: 61
Balmer and Lymann Series
In the textbook, it says that the Balmer Series consists of n1=2 and the Lyman series is n1=1. What does this mean? Are they like levels in the atomic spectra? What does this work for?
- Sun Oct 13, 2019 7:03 pm
- Forum: Properties of Light
- Topic: 1A.9
- Replies: 5
- Views: 173
Re: 1A.9
To find the energy of the photon you use the equation E=hv meaning in this case you multiply the given frequency (8.7 x 10^-14 Hz) by Planck's constant (6.626 x 10^-34).
- Sun Oct 06, 2019 9:54 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Formula Unit
- Replies: 3
- Views: 219
Formula Unit
In the homework it referred to formula unit. Is formula unit any different mathematically than a molecule or atom? Will it affect any of my calculations?
- Sun Oct 06, 2019 9:47 pm
- Forum: Empirical & Molecular Formulas
- Topic: Fundamental m.19
- Replies: 3
- Views: 254
Re: Fundamental m.19
When solving this problem: 1. Multiply the mass given for CO2 of 0.682g x 1mol CO2/44.01g CO2 to convert the grams to moles then multiply 1 mol C/1 mol CO2 to get the mol of C which is 0.0155 mol. Do the same process for all the other elements given (H2O and N2) 2. Convert the moles you just found i...
- Sun Oct 06, 2019 9:31 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 118
Sig Figs
This might be a very dumb question but this was mentioned in my discussion the other day and I don't quite understand what they mean by significant figures. What is it?
- Sun Oct 06, 2019 9:27 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit Conversion
- Replies: 5
- Views: 191
Re: Unit Conversion
The easiest way to convert kg to g is to multiply the mass value by 1000 to get your grams since 1 kilogram= 1000 grams.
- Sun Oct 06, 2019 9:14 pm
- Forum: Limiting Reactant Calculations
- Topic: Actual & Theoretical Yield
- Replies: 4
- Views: 240
Actual & Theoretical Yield
Hi everyone! I have a question regarding the actual and theoretical yield. I know that to find the percent yield we have to divide the actual yield over the theoretical yield x 100%. How do I find the actual yield and the theoretical yield?