Search found 77 matches

by Fiona Latifi 1A
Sat Jan 25, 2020 11:21 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: sign changes in bond enthalpy
Replies: 5
Views: 18

Re: sign changes in bond enthalpy

Bond enthalpy is positive when bonds are being broken because this process requires energy. Bond enthalpy is negative when bonds are being formed because this process releases energy.
by Fiona Latifi 1A
Sat Jan 25, 2020 11:19 am
Forum: Phase Changes & Related Calculations
Topic: Endothermic and Exothermic
Replies: 13
Views: 31

Re: Endothermic and Exothermic

Endothermic reactions use heat as a reactant because they require energy. Exothermic reactions use heat as a product because they release energy.
by Fiona Latifi 1A
Fri Jan 24, 2020 5:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14A Final Exam
Replies: 1
Views: 14

Re: Chem 14A Final Exam

Young Hall 3034
by Fiona Latifi 1A
Fri Jan 24, 2020 3:10 pm
Forum: General Science Questions
Topic: Fall 2019 final
Replies: 7
Views: 28

Re: Fall 2019 final

Ellen Amico 2L wrote:We have to pick them up ourselves in Young Hall 3034 between 9-5pm.

What day?
by Fiona Latifi 1A
Fri Jan 24, 2020 3:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating Delta H
Replies: 3
Views: 18

Re: Calculating Delta H

I believe we ran out of time and were unable to go over the last method.
by Fiona Latifi 1A
Tue Jan 21, 2020 4:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice box
Replies: 4
Views: 14

Re: ice box

If the coefficient of the reactant is a number other than 1.
by Fiona Latifi 1A
Tue Jan 21, 2020 4:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: using K
Replies: 5
Views: 12

Re: using K

Use Kp if the problem gives units of pressure. Otherwise, assume Kc.
by Fiona Latifi 1A
Tue Jan 21, 2020 4:21 pm
Forum: Identifying Acidic & Basic Salts
Topic: Buffer Solution
Replies: 2
Views: 19

Re: Buffer Solution

A buffer solution is a composed of a weak acid and its conjugate base or a weak base and its conjugate acid. Buffers are used to maintain the pH of a solution at a consistent point.
by Fiona Latifi 1A
Tue Jan 21, 2020 4:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gases (units based on K)
Replies: 2
Views: 11

Re: Gases (units based on K)

If you are given pressure units, use Kp. Otherwise, assume Kc.
by Fiona Latifi 1A
Sat Jan 18, 2020 5:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B. 9 Solutions Typo
Replies: 1
Views: 15

6B. 9 Solutions Typo

Is the solutions manual correct for this question? I am getting very different answers when completing the table. Thanks!
by Fiona Latifi 1A
Tue Jan 14, 2020 12:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 8
Views: 38

Re: ICE Table

Yes, you can use it for partial pressures as well as concentrations and amount of moles.
by Fiona Latifi 1A
Mon Jan 13, 2020 7:23 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH range
Replies: 4
Views: 28

Re: pH range

Yes, if a solution is VERY acidic or VERY basic.
by Fiona Latifi 1A
Mon Jan 13, 2020 7:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis vs Autoionization
Replies: 2
Views: 7

Re: Autoprotolysis vs Autoionization

An explanation that I found online said that "the key difference between autoionization and autoprotolysis is that autoionization is the conversion of a neutral state of a chemical species into an ionized state whereas autoprotolysis is the transfer of a proton between two identical chemical sp...
by Fiona Latifi 1A
Mon Jan 13, 2020 7:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP Hydrolysis
Replies: 2
Views: 9

Re: ATP Hydrolysis

The chemical reaction equation for ATP hydrolysis was in some of the textbook questions that were assigned but I don't think Lavelle ever specifically mentioned it in class.
by Fiona Latifi 1A
Mon Jan 13, 2020 7:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw and H3O/OH concentrations
Replies: 5
Views: 14

Re: Kw and H3O/OH concentrations

The concentration of H3O+ is equal to that of OH- when the pH of the solution is 7. When the solution is neutral, the concentration of acid and base essentially cancel one another out.
by Fiona Latifi 1A
Sat Jan 11, 2020 9:41 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw 5I.1
Replies: 4
Views: 37

Re: Hw 5I.1

No, you do not create an ICE table. You simply set K equal to (BrCl)^2/((Cl2)*(Br2)) and solve for the equilibrium concentration of Br2. This question just involves some simple algebra.
by Fiona Latifi 1A
Sat Jan 11, 2020 9:38 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Knowing it's an Equilibrium Reaction
Replies: 4
Views: 22

Re: Knowing it's an Equilibrium Reaction

I believe that at least for this class, we will be told when a reaction is reversible. The double arrow is an easy way to determine this.
by Fiona Latifi 1A
Sat Jan 11, 2020 9:36 am
Forum: Ideal Gases
Topic: Solids and Liquids [ENDORSED]
Replies: 10
Views: 62

Re: Solids and Liquids [ENDORSED]

Solids and liquids are considered pure substances. Therefore they have an activity value of 1. So in equilibrium expressions, we do not include them because their value would just be 1.
by Fiona Latifi 1A
Sat Jan 11, 2020 9:35 am
Forum: Ideal Gases
Topic: textbook [ENDORSED]
Replies: 2
Views: 15

Re: textbook [ENDORSED]

Yes.
by Fiona Latifi 1A
Sat Jan 11, 2020 9:31 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook question 5I.13
Replies: 2
Views: 21

Re: Textbook question 5I.13

For part b, you just substitute F for Cl into the chemical reaction equation from part a (Cl2 --> 2Cl). Using table 5G.2, you can obtain the value of Kc for the new equation. Next, you just make an ICE table and solve for X to find the equilibrium concentrations just like in part a. I'm not sure how...
by Fiona Latifi 1A
Fri Jan 10, 2020 7:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.13 Part C
Replies: 2
Views: 17

5I.13 Part C

This question asks whether Cl2 or F2 is thermodynamically more stable relative to its atoms at 1000 K. How would you determine this? Thanks!
by Fiona Latifi 1A
Fri Jan 10, 2020 5:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure Substance
Replies: 5
Views: 23

Re: Pure Substance

According to the textbook, "activities are used to take into account deviations from ideal behavior". Since solids and liquids are considered to be completely pure substances, they do not deviate from ideal behavior. Therefore, their activity is equal to 1, not zero.
by Fiona Latifi 1A
Sat Dec 07, 2019 5:30 pm
Forum: Naming
Topic: Wrong order
Replies: 4
Views: 27

Re: Wrong order

The ligand names in a coordination compound should be in alphabetical order.
by Fiona Latifi 1A
Sat Dec 07, 2019 1:37 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equations
Replies: 5
Views: 22

Re: Equations

205192823 wrote:Thank you, and also when the equation is pH=-log [H+] it is the same as pH=-log[H3O+]?

Yes
by Fiona Latifi 1A
Fri Dec 06, 2019 8:36 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative Acidity: e- withdrawing groups
Replies: 2
Views: 27

Relative Acidity: e- withdrawing groups

What exactly is an electron-withdrawing group? Can you give some examples? Thanks.
by Fiona Latifi 1A
Fri Dec 06, 2019 8:24 pm
Forum: Naming
Topic: Abbreviations
Replies: 2
Views: 20

Re: Abbreviations

by Fiona Latifi 1A
Fri Dec 06, 2019 8:22 pm
Forum: Naming
Topic: Naming Cont
Replies: 3
Views: 20

Re: Naming Cont

First, alphabetize the ligands. Then, write the transition metal cation. Lastly, don't forget the roman numeral at the end of the name. If the complex has a negative charge, add -ate to the end of the metal name.
by Fiona Latifi 1A
Fri Dec 06, 2019 8:19 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HF
Replies: 4
Views: 44

Re: HF

HF also has a relatively large pKa value and a small Ka value, which makes it a weak acid.
by Fiona Latifi 1A
Thu Dec 05, 2019 12:54 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: calculating pH
Replies: 4
Views: 27

Re: calculating pH

Arianna Perea 3H wrote:will we only have to calculate problems for strong acid/bases or weak ones as well for the final?


Only strong acids or bases
by Fiona Latifi 1A
Tue Dec 03, 2019 9:13 pm
Forum: Lewis Acids & Bases
Topic: How to identify acid vs. base
Replies: 4
Views: 38

How to identify acid vs. base

Question 6A.13 asks to identify whether certain compounds/molecules are Lewis acids or Lewis bases. How can you determine whether a substance is a Lewis acid or base? Thanks!
by Fiona Latifi 1A
Sat Nov 30, 2019 8:44 am
Forum: General Science Questions
Topic: test bank
Replies: 2
Views: 27

Re: test bank

The test bank does not have any of Lavelle's previous exams. I checked.
by Fiona Latifi 1A
Sat Nov 30, 2019 8:43 am
Forum: General Science Questions
Topic: test taking nervousness
Replies: 19
Views: 152

Re: test taking nervousness

Try to really focus on the content and not the fact that you are taking a test. Just treat the questions like regular practice problems that you have successfully completed in the past. I know this can be difficult but it helps me.
by Fiona Latifi 1A
Sat Nov 30, 2019 8:40 am
Forum: Biological Examples
Topic: Cisplatin
Replies: 15
Views: 92

Re: Cisplatin

Emily_4B wrote:would we need to know this on the final?


Yes, you should know it for the final.
by Fiona Latifi 1A
Tue Nov 26, 2019 4:29 pm
Forum: Student Social/Study Group
Topic: -ate Nomenclature for final?
Replies: 2
Views: 27

Re: -ate Nomenclature for final?

If a complex has a negative charge, we add -ate to the end of the metal name. However, I do not have anything in my notes about the -ite ending.
by Fiona Latifi 1A
Tue Nov 26, 2019 11:31 am
Forum: Amphoteric Compounds
Topic: How can compounds be amphoteric?
Replies: 5
Views: 32

Re: How can compounds be amphoteric?

Amphoteric compounds are those that are able to either accept or donate a proton, depending on what other compounds they react with. For example, HCO3- can either accept a proton and become H2CO3 or donate a proton and become CO3 2-.
by Fiona Latifi 1A
Sat Nov 23, 2019 9:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 3
Views: 26

Polydentate

How do you determine whether a ligand is polydentate?
by Fiona Latifi 1A
Sat Nov 23, 2019 7:30 pm
Forum: Hybridization
Topic: 2F.7
Replies: 1
Views: 20

2F.7

How do you identify the hybrid orbitals used by an atom? I am able to figure out the hybridization of an atom (as in question 2F.5) but am having trouble with this question. Thanks.
by Fiona Latifi 1A
Sat Nov 23, 2019 7:04 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 15
Views: 92

Cisplatin

How exactly does cisplatin stop the DNA replication of cancerous cells?
by Fiona Latifi 1A
Sat Nov 23, 2019 7:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand
Replies: 4
Views: 16

Ligand

What is the definition of a ligand?
by Fiona Latifi 1A
Sun Nov 17, 2019 4:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 2
Views: 48

Re: Test 2

My TA sent me this: Test 2 covers all material since midterm up to and including the list below: • Use the Valence-Shell Electron-Pair Repulsion Model (VSEPR) to determine the shape of inorganic, organic, and small biological molecules, cations, and anions. • Use bond dipole moments and shape to det...
by Fiona Latifi 1A
Sun Nov 17, 2019 2:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole moments
Replies: 4
Views: 25

Dipole moments

How do you determine the direction in which a dipole moment points?
by Fiona Latifi 1A
Sun Nov 17, 2019 2:15 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: Quick Run-Through
Replies: 2
Views: 23

Re: Quick Run-Through

Ion-ion interactions are between two ionic molecules. Ion-dipole interactions are between an ion and a polar molecule. Dipole-dipole interactions are between two polar molecules. Dipole-induced dipole interactions are between a polar molecule and a non-polar molecule.
by Fiona Latifi 1A
Sun Nov 17, 2019 1:55 pm
Forum: Student Social/Study Group
Topic: Test 2 Study Worksheets
Replies: 9
Views: 198

Re: Test 2 Study Worksheets

There is a peer learning session tomorrow night at Covel. I'm sure they'll provide some kind of practice problems there.
by Fiona Latifi 1A
Sat Nov 16, 2019 12:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 6
Views: 26

T-shape

Did Dr. Lavelle ever talk about t-shape structures? I don't have it in my notes and a lot of questions include it. Can someone explain this shape?
by Fiona Latifi 1A
Sat Nov 16, 2019 12:18 pm
Forum: General Science Questions
Topic: Test 2
Replies: 7
Views: 43

Re: Test 2

It all seems to be mostly concept based. The only numerical content would be the strengths of bonds and bond angle degrees.
by Fiona Latifi 1A
Sat Nov 16, 2019 12:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of ClO2+
Replies: 6
Views: 44

Shape of ClO2+

Referring to question 2E.5. Is ClO2+ trigonal planar or bent? The solution manual includes both in its answer.
by Fiona Latifi 1A
Sat Nov 09, 2019 9:51 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: London Dispersion Forces VS. Induced Dipole - Induced Dipole
Replies: 2
Views: 14

Re: London Dispersion Forces VS. Induced Dipole - Induced Dipole

Dispersion forces, induced dipole-induced dipole, LDFs, and Van der Waals forces are all equivalent. These interactions are always present and always attractive.
by Fiona Latifi 1A
Sat Nov 09, 2019 9:49 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 5
Views: 28

Re: Dissociation Energy

It's the energy required to break the bonds.
by Fiona Latifi 1A
Sat Nov 09, 2019 9:48 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability Trend
Replies: 3
Views: 12

Re: Polarisability Trend

Larger electron-rich atoms are more polarizable. Usually, on the periodic table, polarizability decreases from left to right increases down a column.
by Fiona Latifi 1A
Sat Nov 09, 2019 9:45 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 5
Views: 28

Re: Dissociation Energy

Dissociation energy refers to the amount of energy required to break down a molecule into singular atoms.
by Fiona Latifi 1A
Sat Nov 09, 2019 7:35 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: Ion-Dipole Forces
Replies: 4
Views: 32

Ion-Dipole Forces

How can you easily determine whether a compound contains ion-dipole forces? Is there some kind of rule to go off of? Thanks!
by Fiona Latifi 1A
Fri Nov 08, 2019 1:55 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: Order of strength
Replies: 3
Views: 27

Re: Order of strength

Weakest --> Strongest: London dispersion forces, dipole-dipole forces, hydrogen bonding
by Fiona Latifi 1A
Sat Nov 02, 2019 9:28 am
Forum: Resonance Structures
Topic: Tips for drawing resonance structures
Replies: 3
Views: 18

Re: Tips for drawing resonance structures

It's important that you understand how to calculate and use formal charge when drawing resonance structures. This will allow you to select the primary resonance structure of the molecule.
by Fiona Latifi 1A
Wed Oct 30, 2019 9:32 pm
Forum: Ionic & Covalent Bonds
Topic: Radicals
Replies: 9
Views: 55

Re: Radicals

Radicals also only exist for a short amount of time because they are so reactive. Food supplements can react with radicals in the body before they cause damage to DNA, which is why it's important to eat plenty of vitamins and nutrients!
by Fiona Latifi 1A
Wed Oct 30, 2019 9:22 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bonds
Replies: 3
Views: 22

Re: coordinate covalent bonds

A coordinate covalent bond occurs when the shared electrons all come from the same atom. In a simple covalent bond, each atom supplies one electron. Coordinate covalent bonds are common between metals and ligands.
by Fiona Latifi 1A
Wed Oct 30, 2019 9:18 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 4
Views: 24

Re: Drawing Lewis Structures

Generally, you would want to place the atom with the lowest electronegativity in the center of your lewis structure. Hydrogen can never be the central atom. To start your diagram, you should count the number of valence electrons for each atom so that you can determine how many electrons you need in ...
by Fiona Latifi 1A
Wed Oct 30, 2019 9:14 pm
Forum: Electronegativity
Topic: Electronegativity vs. Electron Affinity
Replies: 7
Views: 42

Electronegativity vs. Electron Affinity

Could someone please explain the conceptual difference between electronegativity and electron affinity? Thanks!
by Fiona Latifi 1A
Wed Oct 23, 2019 9:31 pm
Forum: Resonance Structures
Topic: defintion
Replies: 7
Views: 67

Re: defintion

Resonance structures are alternate structures of the same molecule so basically yes, your definition is correct.
by Fiona Latifi 1A
Tue Oct 22, 2019 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Online Modules
Replies: 7
Views: 65

Online Modules

Does anyone know if there will be videos and modules posted for the new content on Lavelle's website? Was this just for the introductory material? I found the videos and modules very helpful! Thanks.
by Fiona Latifi 1A
Tue Oct 22, 2019 9:43 pm
Forum: DeBroglie Equation
Topic: When to use the DeBroglie Equation
Replies: 3
Views: 29

Re: When to use the DeBroglie Equation

It depends on what values you are given in the problem. If you are given the momentum, then use De Broglie's equation but if you are only given the frequency and asked to find the wavelength, then use c=lambda*v. It helps if you start out by writing the values that you have. This way, you can easily...
by Fiona Latifi 1A
Tue Oct 22, 2019 9:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: The plus and minus sign on the magnetic quantum #
Replies: 5
Views: 35

Re: The plus and minus sign on the magnetic quantum #

I would say that if the textbook specifically tells you to write the +, then you should write it.
by Fiona Latifi 1A
Mon Oct 21, 2019 2:12 pm
Forum: Trends in The Periodic Table
Topic: Focus 1 Exercise 1.13
Replies: 3
Views: 25

Focus 1 Exercise 1.13

This question asks us to explain why the ionization energy for oxygen is lower than that of either nitrogen and fluorine. I do not understand the explanation that the solution manual provides. Can someone explain this anomaly in a different way? Thanks!
by Fiona Latifi 1A
Thu Oct 17, 2019 9:30 pm
Forum: Properties of Electrons
Topic: effective nuclear charge
Replies: 5
Views: 33

Re: effective nuclear charge

The higher the effective nuclear charge of an atom, the atom can attract electrons more closely to its nucleus. The tighter an atom's hold is on its electrons, the smaller its atomic radius. In conclusion, a higher effective nuclear charge causes a lower atomic radius.
by Fiona Latifi 1A
Thu Oct 17, 2019 5:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 507

Re: Advice for studying

I have been watching the videos posted on Lavelle's website and completing the modules. Then throughout the week, I will read the sections in the textbook and complete all of the homework problems. Good luck!
by Fiona Latifi 1A
Thu Oct 17, 2019 4:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 2
Views: 20

Re: Orbitals

The number of orbitals is based on the subshell. The s-subshell corresponds to 1 orbital, the p-subshell has 3, d-subshell has 5, and f-subshell has 7. I hope this was helpful!
by Fiona Latifi 1A
Wed Oct 16, 2019 6:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D.23 Homework Question
Replies: 1
Views: 19

1D.23 Homework Question

1D.23 How many orbitals can have the following quantum numbers in an atom? (a)n=2, l=1 (b)n=4, l=2, ml=-2 (c)n=2 (d)n=3, l=2, ml=+1 I understand that the answer to B and D is 1 because they both have 3 quantum numbers that identify a single orbital. Could someone please explain how the answer to A i...
by Fiona Latifi 1A
Mon Oct 14, 2019 1:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Post-Module Question
Replies: 3
Views: 38

Atomic Spectra Post-Module Question

#38 on the Atomic Spectra Post-Module Assessment asks us to calculate the frequency of a photon emitted by a hydrogen atom when an electron makes a transition from the fourth to the second principal quantum level. A. -6.17 x 10^14 Hz B. 1.62 x 10^-15 Hz C. 6.17 x 10^14 Hz D. 2.71 x 10^-52 Hz I keep ...
by Fiona Latifi 1A
Fri Oct 11, 2019 12:16 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Clarification
Replies: 3
Views: 22

Re: Photoelectric Effect Clarification

To add on to the previous reply, increasing the intensity of light increases the number of photons, not the energy of the photons. One photon can eject one electron to do so, the photon must have either a short wavelength or high frequency so that the photons have enough energy.
by Fiona Latifi 1A
Fri Oct 11, 2019 12:10 pm
Forum: Properties of Electrons
Topic: Multi-Electron Systems
Replies: 4
Views: 28

Re: Multi-Electron Systems

Although it was once thought otherwise, the Bohr Model can only be used for the element of hydrogen, which has only one electron.
by Fiona Latifi 1A
Fri Oct 11, 2019 12:07 pm
Forum: DeBroglie Equation
Topic: Frequency and de Broglie Equation Derivation
Replies: 3
Views: 38

Re: Frequency and de Broglie Equation Derivation

The equations used to derive the De Broglie wavelength equation cannot be used for electrons. Lavelle just demonstrated the way that the equation was originally derived so that we would understand where the equation comes from.
by Fiona Latifi 1A
Fri Oct 11, 2019 11:55 am
Forum: Properties of Light
Topic: Equations for quantum mechanics
Replies: 3
Views: 32

Re: Equations for quantum mechanics

The equations that we learned on Monday that pertain to light and electromagnetic radiation cannot be used for electrons. They were just used today to demonstrate how De Broglie derived his wavelength equation.
by Fiona Latifi 1A
Fri Oct 11, 2019 11:49 am
Forum: DeBroglie Equation
Topic: Measurable V. Non-Measurable
Replies: 5
Views: 46

Re: Measurable V. Non-Measurable

If the De Broglie wavelength value is greater than 10^-15, it is measurable.
by Fiona Latifi 1A
Thu Oct 03, 2019 9:51 am
Forum: Molarity, Solutions, Dilutions
Topic: HW E.23
Replies: 3
Views: 18

Re: HW E.23

For parts A and C, you basically do it the same way. You just have to determine the number of ions in the compound. In part A, there is only 1 Cu2+ ion. In part C, there are 6 F- ions because it has a subscript of 6. So you would have to first divide by the molar mass for both parts A and C. Then, m...
by Fiona Latifi 1A
Thu Oct 03, 2019 9:48 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Textbook Question E15
Replies: 3
Views: 36

Textbook Question E15

For question E15, would OH be the sulfide of the metal? Or would it be (OH)2? Thanks.
by Fiona Latifi 1A
Thu Oct 03, 2019 9:42 am
Forum: SI Units, Unit Conversions
Topic: Finding Molar Mass
Replies: 3
Views: 40

Re: Finding Molar Mass

In this question, you just add to find the molar mass. For Na2CO3 * 10H2O, you would compute 2(22.99) + 12.01 + 3(16) +10(18.02) = 286.19.
by Fiona Latifi 1A
Thu Oct 03, 2019 9:37 am
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 122

Re: Test Materials

Yes, we are given a periodic table as well as the formula sheet posted on Dr. Lavelle's website.
by Fiona Latifi 1A
Mon Sep 30, 2019 2:58 pm
Forum: Molarity, Solutions, Dilutions
Topic: HW1 F3 Help
Replies: 4
Views: 74

HW1 F3 Help

Question F3 Part A on page F50 asks us to write the formula for nitric acid. I do not understand how to determine that the formula for nitric acid is HNO3. Can someone please explain? Thanks.

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