Search found 98 matches

by Andrea_Torres
Sun Mar 15, 2020 8:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic and Voltaic
Replies: 5
Views: 67

Galvanic and Voltaic

What is the difference between the two? Does it affect which is anode or cathode and how if so?
by Andrea_Torres
Sat Mar 14, 2020 9:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading Scale
Replies: 14
Views: 270

Re: Grading Scale

Yes I believe it should be the same where to get a C- you need 50% to pass.
by Andrea_Torres
Sat Mar 14, 2020 9:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Final and Work
Replies: 2
Views: 82

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.
by Andrea_Torres
Fri Mar 13, 2020 3:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 11
Views: 131

Final

Is the final up already? If so where would I find it? Is it due by a certain day?
by Andrea_Torres
Tue Mar 10, 2020 8:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Review Sessions
Replies: 1
Views: 44

Review Sessions

Since classes are cancelled does that mean that review sessions are cancelled as well? Will those also be online?
by Andrea_Torres
Sun Mar 08, 2020 5:13 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: K < >
Replies: 8
Views: 51

K < >

How do we determine whether k is < or > 1? Also, why is it important?
by Andrea_Torres
Sun Mar 08, 2020 5:08 pm
Forum: Balancing Redox Reactions
Topic: Balancing a reaction
Replies: 5
Views: 44

Balancing a reaction

In the test, I remember that they asked to balance the reaction but how do I do that?
by Andrea_Torres
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: 41

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?
by Andrea_Torres
Sun Mar 08, 2020 4:55 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing and Reducing
Replies: 5
Views: 29

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?
by Andrea_Torres
Thu Mar 05, 2020 7:17 pm
Forum: Balancing Redox Reactions
Topic: Values of Andode and Cathode
Replies: 8
Views: 88

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?
by Andrea_Torres
Sun Mar 01, 2020 5:30 pm
Forum: Van't Hoff Equation
Topic: Deriving [ENDORSED]
Replies: 2
Views: 50

Deriving [ENDORSED]

How do we derive the van't hoff equation when they say K1 and K2 exists?
by Andrea_Torres
Sun Mar 01, 2020 5:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt bridge
Replies: 2
Views: 32

Salt bridge

What is the purpose of the salt bridge in the cell diagrams?
by Andrea_Torres
Sun Mar 01, 2020 5:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: N value
Replies: 7
Views: 70

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?
by Andrea_Torres
Sun Mar 01, 2020 5:21 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Equations
Replies: 2
Views: 41

Equations

What is a good technique for remembering this equation and what each variable stands for?
by Andrea_Torres
Sun Mar 01, 2020 5:08 pm
Forum: Balancing Redox Reactions
Topic: Anode and Cathode
Replies: 8
Views: 60

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?
by Andrea_Torres
Sun Feb 23, 2020 8:54 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Work
Replies: 5
Views: 53

Work

How do we determine whether work has been done on a system?
by Andrea_Torres
Sun Feb 23, 2020 8:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 5
Views: 50

Test 2

What outline will test 2 be covering? Is it up to what we learned Friday or will in continue to week 8?
by Andrea_Torres
Sun Feb 23, 2020 8:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 17
Views: 213

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.
by Andrea_Torres
Sun Feb 23, 2020 7:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half reactions
Replies: 13
Views: 71

Re: Half reactions

A half reaction is either the oxidation or reduction reaction that makes up a redox reaction.
by Andrea_Torres
Sun Feb 23, 2020 7:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: chemistry community posts
Replies: 12
Views: 73

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.
by Andrea_Torres
Sun Feb 16, 2020 7:26 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 8
Views: 153

Phase changes

How do we determine when there has been a phase change?
by Andrea_Torres
Sun Feb 16, 2020 7:15 pm
Forum: Calculating Work of Expansion
Topic: Irreversible and Reversible problem
Replies: 4
Views: 97

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?
by Andrea_Torres
Sun Feb 16, 2020 7:13 pm
Forum: Calculating Work of Expansion
Topic: Irreversible and Reversible Expanision
Replies: 9
Views: 172

Irreversible and Reversible Expanision

What is irreversible and reversible expansion? How do we know which is which when faced with a problem?
by Andrea_Torres
Sun Feb 16, 2020 7:10 pm
Forum: Calculating Work of Expansion
Topic: Work Equation
Replies: 6
Views: 128

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?
by Andrea_Torres
Sun Feb 16, 2020 7:06 pm
Forum: Balancing Redox Reactions
Topic: Seperating Redoz RXNS
Replies: 7
Views: 38

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?
by Andrea_Torres
Sun Feb 09, 2020 9:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated// Energy
Replies: 11
Views: 90

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.
by Andrea_Torres
Sun Feb 09, 2020 9:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X is to small
Replies: 8
Views: 131

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?
by Andrea_Torres
Sun Feb 09, 2020 9:18 pm
Forum: Phase Changes & Related Calculations
Topic: closed vs isolated
Replies: 10
Views: 77

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.
by Andrea_Torres
Sun Feb 09, 2020 9:13 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 10
Views: 69

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?
by Andrea_Torres
Sun Feb 09, 2020 8:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice tables
Replies: 2
Views: 39

Ice tables

Is it possible that it can be given in a problem two different molarities? Does it matter when doing ice tables?
by Andrea_Torres
Sun Feb 02, 2020 8:52 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 3
Views: 46

Phase changes

How do phase changes affect a reaction? How do they matter?
by Andrea_Torres
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: 82

Partial Pressure

How do we do partial pressure? What is the difference between partial pressure and regular pressure?
by Andrea_Torres
Sun Feb 02, 2020 8:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Quadratic Equation
Replies: 5
Views: 96

Quadratic Equation

How do we use the quadratic equation? Which values go into each variable?
by Andrea_Torres
Sun Feb 02, 2020 8:24 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 12
Views: 154

PV=nRT

What does each letter stand for?
by Andrea_Torres
Sun Feb 02, 2020 8:11 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Shifts
Replies: 6
Views: 112

Shifts

How do we know which way the equilibrium will shift?
by Andrea_Torres
Sun Jan 26, 2020 7:07 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy is said to be additive
Replies: 10
Views: 90

Enthalpy is said to be additive

What does it mean for something to be additive?
by Andrea_Torres
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: 21

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?
by Andrea_Torres
Thu Jan 23, 2020 6:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical equation
Replies: 5
Views: 50

Chemical equation

How are we supposed to make the chemical equation on our own when solving for concentration and down ice tables?
by Andrea_Torres
Thu Jan 23, 2020 6:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Value of Ka, Kw, Kb
Replies: 5
Views: 45

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.
by Andrea_Torres
Thu Jan 23, 2020 6:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Value of X
Replies: 7
Views: 55

Value of X

How do we find the value of x when it is not given?
by Andrea_Torres
Sun Jan 19, 2020 6:01 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature
Replies: 5
Views: 42

Temperature

Why does temperature (endothermic & exothermic) matter? How do we know from solving a problem if it is endothermic of exothermic?
by Andrea_Torres
Sun Jan 19, 2020 6:00 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 177

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?
by Andrea_Torres
Sun Jan 19, 2020 5:52 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Tables
Replies: 13
Views: 89

ICE Tables

Why is it that H2O gets cancelled out when doing ice tables?
by Andrea_Torres
Thu Jan 16, 2020 8:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: H3O+
Replies: 4
Views: 26

H3O+

Is there a reason we use H3O+ or is it just something we have to use for acids?
by Andrea_Torres
Thu Jan 16, 2020 6:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A.19
Replies: 2
Views: 22

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?
by Andrea_Torres
Sun Jan 12, 2020 4:47 pm
Forum: Ideal Gases
Topic: Kc and Kp
Replies: 8
Views: 58

Kc and Kp

What is the difference between using Kc and Kp?
by Andrea_Torres
Sun Jan 12, 2020 4:43 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 34
Views: 591

Re: R in PV=nRT

The R in PV=nRT stands for the gas constant and its units are 8.314 J/mol·K.
by Andrea_Torres
Sun Jan 12, 2020 4:41 pm
Forum: Ideal Gases
Topic: P=(n/v)RT
Replies: 12
Views: 102

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).
by Andrea_Torres
Thu Jan 09, 2020 5:53 pm
Forum: Ideal Gases
Topic: 5G.11
Replies: 6
Views: 44

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?
by Andrea_Torres
Thu Jan 09, 2020 5:27 pm
Forum: Ideal Gases
Topic: Solving for K (coefficients)
Replies: 11
Views: 91

Solving for K (coefficients)

When solving for K to the coefficients have to be in a particular order?
by Andrea_Torres
Thu Jan 09, 2020 5:19 pm
Forum: Ideal Gases
Topic: Solving for K when only given balanced equation [ENDORSED]
Replies: 6
Views: 68

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?
by Andrea_Torres
Sat Dec 07, 2019 8:17 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 4881

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?
by Andrea_Torres
Sat Dec 07, 2019 3:43 pm
Forum: Hybridization
Topic: Hybradization
Replies: 3
Views: 106

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?
by Andrea_Torres
Sat Dec 07, 2019 3:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculations for KA
Replies: 1
Views: 31

Calculations for KA

Can someone explain to me how KA works and how this helps us find the pH?
by Andrea_Torres
Sat Dec 07, 2019 3:27 pm
Forum: Naming
Topic: Memorization
Replies: 4
Views: 146

Memorization

Can anyone recommend me some strategies for memorizing the names of the ligands?
by Andrea_Torres
Thu Dec 05, 2019 7:57 pm
Forum: General Science Questions
Topic: Tightly bound
Replies: 2
Views: 183

Tightly bound

How can you identify which pair of atoms are most tightly bound?
by Andrea_Torres
Thu Dec 05, 2019 7:55 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids and bases
Replies: 1
Views: 40

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?
by Andrea_Torres
Sun Dec 01, 2019 7:09 pm
Forum: Lewis Acids & Bases
Topic: Lewis and Bronsted
Replies: 2
Views: 24

Lewis and Bronsted

What is the difference between Lewis acids and bases and Bronsted acid and bases?
by Andrea_Torres
Sun Dec 01, 2019 6:57 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Neutralization
Replies: 7
Views: 97

Re: Neutralization

It is most important to know that neutralization is a reaction between acid and base that ends with salt and water.
by Andrea_Torres
Sun Dec 01, 2019 6:55 pm
Forum: Lewis Acids & Bases
Topic: Bases
Replies: 4
Views: 42

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?
by Andrea_Torres
Sun Dec 01, 2019 6:46 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH
Replies: 4
Views: 30

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.
by Andrea_Torres
Sun Dec 01, 2019 6:31 pm
Forum: Student Social/Study Group
Topic: Final Studying
Replies: 8
Views: 100

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?
by Andrea_Torres
Sun Nov 24, 2019 4:17 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 2
Views: 32

Ligands

Can someone please explain to me what are ligands?
by Andrea_Torres
Sun Nov 24, 2019 4:15 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing sigma & Pi bonds
Replies: 7
Views: 182

Drawing sigma & Pi bonds

When drawing the sigma and pi bonds is it basically just circling the bonds and mentioning its hybridization?
by Andrea_Torres
Sun Nov 24, 2019 4:06 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE
Replies: 6
Views: 138

AXE

Does the AXE formula only give us the shape of the molecule? Does it serve any other purpose?
by Andrea_Torres
Sun Nov 24, 2019 4:02 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 13
Views: 120

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?
by Andrea_Torres
Sun Nov 24, 2019 3:55 pm
Forum: Hybridization
Topic: Hybrid orbitals
Replies: 5
Views: 53

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?
by Andrea_Torres
Sun Nov 17, 2019 6:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 3
Views: 50

VSEPR

How is the VSEPR model used in determining shape? Is it also used in finding the angles?
by Andrea_Torres
Sun Nov 17, 2019 6:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 5
Views: 64

VSEPR

How is the VSEPR model used in determining shape? Is it also used in finding the angles?
by Andrea_Torres
Sun Nov 17, 2019 6:23 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 2
Views: 27

Sigma and Pi bonds

Can someone please explain to me what are sigma and pi bonds?
by Andrea_Torres
Sun Nov 17, 2019 6:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion
Replies: 2
Views: 32

Repulsion

How does repulsion help influence the molecular shape?
by Andrea_Torres
Sun Nov 17, 2019 6:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of XeF4
Replies: 2
Views: 27

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?
by Andrea_Torres
Sun Nov 17, 2019 6:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Prediction of Angles
Replies: 4
Views: 42

Prediction of Angles

How are we supposed to predict the bond angles? Do we use the shape name or the VSEPR model?
by Andrea_Torres
Sun Nov 03, 2019 6:48 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 15
Views: 315

Resonance structures

What are resonance structures?
by Andrea_Torres
Sun Nov 03, 2019 6:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: The equation
Replies: 3
Views: 40

The equation

I know that the L in the equation means the # of electrons in a lone pair but what is a lone pair?
by Andrea_Torres
Sun Nov 03, 2019 6:38 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent
Replies: 5
Views: 45

Ionic and Covalent

What is the difference between covalent and ionic bonds?
by Andrea_Torres
Sun Nov 03, 2019 6:35 pm
Forum: Lewis Structures
Topic: Single bond
Replies: 2
Views: 28

Single bond

Does each single bond mean 2 electrons?
by Andrea_Torres
Sun Nov 03, 2019 6:32 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge and Energy
Replies: 4
Views: 46

Formal Charge and Energy

How does formal charge show us which has the highest energy?
by Andrea_Torres
Sat Oct 26, 2019 10:02 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 5
Views: 56

Ionic and Covalent Bonds

How do you know when it is ionic vs covalent?
by Andrea_Torres
Sat Oct 26, 2019 9:50 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 5
Views: 48

Bond lengths

Is there a way to find the bond lengths?
by Andrea_Torres
Sat Oct 26, 2019 9:47 pm
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 189

Double bond

How do you know when to double bond?
by Andrea_Torres
Sat Oct 26, 2019 9:33 pm
Forum: Lewis Structures
Topic: Drawing the Lewis Structure
Replies: 2
Views: 44

Drawing the Lewis Structure

Is there a specific way that we have to draw the structure?
by Andrea_Torres
Sat Oct 26, 2019 8:59 pm
Forum: Lewis Structures
Topic: Charges
Replies: 2
Views: 38

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?
by Andrea_Torres
Sun Oct 20, 2019 2:26 pm
Forum: Properties of Light
Topic: N levels
Replies: 8
Views: 93

N levels

Can someone explain to me what are the n levels that Dr. Lavelle is writing on the board in lectures?
by Andrea_Torres
Sun Oct 20, 2019 1:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Configuration
Replies: 1
Views: 45

Electron Configuration

Can someone explain to me how electron configuration works and how to use s, p, d, and f?
by Andrea_Torres
Sun Oct 20, 2019 12:58 pm
Forum: Properties of Light
Topic: Problem 1.27
Replies: 2
Views: 91

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).
by Andrea_Torres
Sun Oct 20, 2019 12:27 pm
Forum: Properties of Light
Topic: Unit for Wavelength
Replies: 34
Views: 331

Re: Unit for Wavelength

The unit for wavelength is in meters but sometimes for some problems nanometers is used.
by Andrea_Torres
Sun Oct 20, 2019 12:20 pm
Forum: Properties of Light
Topic: 1A.9 Energy of Photon
Replies: 12
Views: 138

Re: 1A.9 Energy of Photon

To calculate for the energy you use the equation E=hv, h being Planck's constant.
by Andrea_Torres
Sun Oct 13, 2019 8:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1A.11
Replies: 2
Views: 32

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...
by Andrea_Torres
Sun Oct 13, 2019 8:06 pm
Forum: DeBroglie Equation
Topic: Problem 1B.7
Replies: 3
Views: 41

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...
by Andrea_Torres
Sun Oct 13, 2019 7:59 pm
Forum: Einstein Equation
Topic: 1B.7 Part c
Replies: 3
Views: 75

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.
by Andrea_Torres
Sun Oct 13, 2019 7:44 pm
Forum: Properties of Light
Topic: Balmer and Lymann Series
Replies: 1
Views: 17

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?
by Andrea_Torres
Sun Oct 13, 2019 7:03 pm
Forum: Properties of Light
Topic: 1A.9
Replies: 5
Views: 62

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).
by Andrea_Torres
Sun Oct 06, 2019 9:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Unit
Replies: 3
Views: 81

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?
by Andrea_Torres
Sun Oct 06, 2019 9:47 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental m.19
Replies: 3
Views: 64

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...
by Andrea_Torres
Sun Oct 06, 2019 9:31 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 38

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?
by Andrea_Torres
Sun Oct 06, 2019 9:27 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversion
Replies: 5
Views: 64

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.
by Andrea_Torres
Sun Oct 06, 2019 9:14 pm
Forum: Limiting Reactant Calculations
Topic: Actual & Theoretical Yield
Replies: 4
Views: 79

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?

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