Search found 93 matches

by IreneGi2I
Sun Jan 17, 2021 11:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium shifts: left of right?
Replies: 13
Views: 33

Re: equilibrium shifts: left of right?

Even after adding more of reactants or products, the equilibrium constant will not change. Therefore, to balance between reactant and product and reach to the same equilibrium constant, if more reactant is added, the reaction will shift to the right. In this way, more products will form and the same...
by IreneGi2I
Sun Jan 17, 2021 11:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Week 1 Sapling 10
Replies: 8
Views: 58

Re: Week 1 Sapling 10

I think Sapling gives different values randomly, so it would be helpful if you can attach screenshot of the question!
by IreneGi2I
Sun Jan 17, 2021 11:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use ICE chart?
Replies: 10
Views: 45

Re: When to use ICE chart?

We use ICE table when we are given with K and initial concentration for product and reactant. By using ICE table, we can find out what the concentrations for product/reactant will be when the equilibrium is reached. Hope this helps!
by IreneGi2I
Sun Jan 17, 2021 11:50 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature and Kc
Replies: 5
Views: 24

Re: Temperature and Kc

Endothermic: Absorbs heat (requires heat) to form products Exothermic: Releases heat (gives off heat) to form products When heat is added, 1) Endothermic: Shift to right (more products form) --> [P] increases in [P]/[R] --> Therefore, Kc increases 2) Exothermic: Shift to left (more reactants form) -...
by IreneGi2I
Sun Jan 17, 2021 11:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Combining chemical equations
Replies: 5
Views: 34

Combining chemical equations

For Sapling #5, I got the answer by multiplying equilibrium constants for two relevant chemical equations.

Do we always multiply equilibrium constants when combining chemical equations? Or, would there be other ways to solve problems like this?
by IreneGi2I
Sun Jan 10, 2021 4:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Counting Moles
Replies: 11
Views: 67

Re: Counting Moles

Yes, I believe only gases are counted in this case!
by IreneGi2I
Sun Jan 10, 2021 4:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Cubic equation problems
Replies: 2
Views: 21

Cubic equation problems

Hi, I'm wondering if we will be asked about the concept involving cubic equation.
I remember cubic equation problem was covered in the Audio-Visual Focus-Topic video, but I think Dr. Lavelle didn't go over it during the lecture. Would we have to know about this concept as well?
by IreneGi2I
Sun Jan 10, 2021 4:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: How does an inert gas effect a closed system with these certain conditions?
Replies: 5
Views: 61

Re: How does an inert gas effect a closed system with these certain conditions?

When inert gas is added to a closed container, 1) The pressure inside the container will increase (because there are now more gas particles overall in a certain given space) 2) The volume of the container will stay the same (because the container itself hasn't been physically pushed/squeezed; i.e. p...
by IreneGi2I
Sun Jan 10, 2021 4:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changing pressure
Replies: 7
Views: 43

Re: Changing pressure

Yes, I believe changing pressure by decreasing volume would only cause a change because adding inert gas doesn't affect the concentration!
by IreneGi2I
Sun Jan 10, 2021 4:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changing Temperature Effect on K
Replies: 5
Views: 21

Re: Changing Temperature Effect on K

First, we need to find out whether the reaction is endothermic or exothermic. And then, we can predict whether adding heat would favor product or reactant (and thus how K will change accordingly). 1) Endothermic reaction: Absorbs heat energy (requires heat for the product to form) - Adding heat: Fav...
by IreneGi2I
Sat Dec 12, 2020 1:45 am
Forum: Identifying Acidic & Basic Salts
Topic: Neutral Salts
Replies: 7
Views: 76

Neutral Salts

Hi, I'm wondering how we can determine if a salt is neutral.

I can understand how we determine acidic/basic salt, but I'm a little confused with how I can figure out the given salt is neutral (for example, KBr).
by IreneGi2I
Fri Dec 11, 2020 11:35 pm
Forum: Calculating the pH of Salt Solutions
Topic: 6C.17
Replies: 2
Views: 29

6C.17

For question 6C.17, it asks which one is stronger base: BrO- or C17H19O3N. On the solutions manual, since BrO- has smaller pKb value, it is a stronger base. I understand that in case of acid, smaller pKA & larger KA value means it is stronger acid. Can this be applied the same way to base then? ...
by IreneGi2I
Fri Dec 11, 2020 10:38 pm
Forum: Amphoteric Compounds
Topic: Textbook 6A.17
Replies: 4
Views: 157

Re: Textbook 6A.17

How would we know that SO3 is acidic? Couldn't it be amphoteric as well? Generally, metal oxides (Group 1 and Group 2) are basic, and nonmetal oxides (right-hand side of periodic table) are acidic. Also, metalloid oxides tend to be amphoteric. Since SO3 has S atom, which is nonmetal, we can determi...
by IreneGi2I
Fri Dec 11, 2020 6:49 am
Forum: Naming
Topic: 9C.1
Replies: 1
Views: 13

9C.1

For (b) and (c), (b) [Co (NH3)6] 3+ is 'Hexaammine cobalt (III) ion (c) [Co (CN)5 (OH2)] 2- is 'Aquapentacyano cobaltate (III) ion I can understand how other things work, but I'm little confused with how to determine whether we should write 'Cobalt' or 'Cobaltate'. Even though the two has the same o...
by IreneGi2I
Fri Dec 11, 2020 3:16 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.1
Replies: 1
Views: 10

2E.1

Hi, I'm wondering why the central atom must have lone pairs in this model. Since it is a linear structure, doesn't it mean that there is no lone pair attached to the central atom? If not, how many lone pairs it should have?
by IreneGi2I
Sun Dec 06, 2020 11:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Prefixes
Replies: 9
Views: 66

Re: Prefixes

I think memorizing the basic ligand names on the ligand chart would greatly help in the final exam. Also, it would be nice to memorize the prefix for numbers up to 10 (like mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca)! Where can we access the ligand chart? There is a chart on our Sap...
by IreneGi2I
Sun Dec 06, 2020 10:59 pm
Forum: Naming
Topic: en
Replies: 5
Views: 69

Re: en

I think it would be nice to practice and memorize some ligands on the ligand chart on textbook as well. How do we find this chart? You can access the chart through this link : https://sites.google.com/site/chempendix/ligands Also, there is a "Naming Coordination Compounds" file on Chem14A...
by IreneGi2I
Sun Dec 06, 2020 10:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation state vs. oxidation number
Replies: 4
Views: 36

Re: Oxidation state vs. oxidation number

I think those two terms can be used interchangeably in many cases, but to be specific, oxidation state is the degree of oxidation of an atom in a molecule, and oxidation number is the central atom's charge when all the ligands are removed (in a coordinate complex).
by IreneGi2I
Sun Dec 06, 2020 10:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Prefixes
Replies: 9
Views: 66

Re: Prefixes

I think memorizing the basic ligand names on the ligand chart would greatly help in the final exam. Also, it would be nice to memorize the prefix for numbers up to 10 (like mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca)!
by IreneGi2I
Sun Dec 06, 2020 10:46 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Finding Coordination Numbers
Replies: 7
Views: 85

Re: Finding Coordination Numbers

When you look at the ligand chart on Chem 14A website, there are the charges indicated in the chart. For example, CN has -1 charge and CO3 has -2 charge. When there is [Co(NH3)5Cl]Cl, to get the oxidation state of Cobalt, we first need to calculate the overall charges in the compound. First, NH is a...
by IreneGi2I
Sun Dec 06, 2020 10:37 pm
Forum: Naming
Topic: Question about How Much We Need to Memorize
Replies: 2
Views: 31

Re: Question about How Much We Need to Memorize

I am not really sure if we are going to be allowed to use the ligand chart for the final, but I think it would be nice to memorize some ligands that come up frequently in the practice problems.
by IreneGi2I
Sun Dec 06, 2020 10:36 pm
Forum: Naming
Topic: en
Replies: 5
Views: 69

Re: en

I think it would be nice to practice and memorize some ligands on the ligand chart on textbook as well.
by IreneGi2I
Sun Nov 29, 2020 11:36 pm
Forum: Hybridization
Topic: Determining the number of sigma and pi bonds
Replies: 8
Views: 57

Re: Determining the number of sigma and pi bonds

Single bond = 1 sigma bond Double bond = 1 sigma bond + 1 pi bond Triple bond = 1 sigma bond + 2 pi bonds Using this, you can calculate the numbers of sigma/pi bonds in the given compound. I calculated how many single/double/triple bonds are there in a compound and add them up altogether to find out...
by IreneGi2I
Sun Nov 29, 2020 11:32 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 21
Views: 184

Re: Sigma and Pi bonds

Sigma bond forms when two orbitals interact end-to-end, and pi bond forms when two orbitals overlap side by side. Sigma bond allows the atoms to rotate while pi bond does not allow the atoms to rotate (if they rotate, then the pi bond will break). The simple way to distinguish between sigma bond and...
by IreneGi2I
Sun Nov 29, 2020 11:28 pm
Forum: Hybridization
Topic: How to simply determine hybridization
Replies: 27
Views: 214

Re: How to simply determine hybridization

First, calculate the sum of bonding pairs and lone pairs (of the atom in question). The calculated sum is equal to the total orbitals of hybridization orbitals. For example, sp hybrid orbitals have 1+1=2 orbitals total sp2 hybrid orbitals have 1+2=3 orbitals total sp3d hybrid orbitals have 1+3+1=5 o...
by IreneGi2I
Sun Nov 29, 2020 10:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Delocalized pi bond?
Replies: 4
Views: 57

Delocalized pi bond?

I am confused about the concept of delocalized pi bond. Can someone explain what it means by 'delocalized pi bonds' and how to figure out whether the compound has delocalized pi bonds?
by IreneGi2I
Sun Nov 29, 2020 10:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #3
Replies: 4
Views: 46

Sapling #3

For number 3 of Sapling homework, the below lewis structure of a molecule is given. And the question is asking what the smallest bond angle would be. I thought this structure is similar to H2O, which is bent shape, but the solution says that it is actually a linear shape (and smallest bond angle is ...
by IreneGi2I
Sun Nov 22, 2020 8:40 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Covalent Character and Polarizability
Replies: 4
Views: 62

Re: Covalent Character and Polarizability

When anion's electron cloud is distorted toward the cation, there will be more "shared" region between two atoms. This means that there will be more covalent character between them!
by IreneGi2I
Sun Nov 22, 2020 8:36 pm
Forum: Resonance Structures
Topic: Atom Connectivities
Replies: 5
Views: 56

Re: Atom Connectivities

The atom connectivity means the specific pattern of chemical bonds between atoms in a molecule!
by IreneGi2I
Sun Nov 22, 2020 8:32 pm
Forum: Bond Lengths & Energies
Topic: Interaction Potential Energy
Replies: 3
Views: 40

Re: Interaction Potential Energy

The previous posts explained it very well, and just to add, it would be easier to memorize that when atoms attract each other and interact (bind to each other), they lose energy (because they have become more stable state than before). Therefore, the energy is negative when it comes to interaction p...
by IreneGi2I
Sun Nov 22, 2020 8:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 11
Views: 129

Re: Extra Credit

I am not sure, but I believe there will not be extra credit opportunities in this class. My friend who has taken 14A told me that there was no extra credit opportunities when she took it
by IreneGi2I
Sun Nov 22, 2020 8:23 pm
Forum: Administrative Questions and Class Announcements
Topic: 14CL
Replies: 4
Views: 46

Re: 14CL

Right, 14CL is required for pre-health. The required lab courses for chemistry are 14BL and 14CL (Chem 153L is not required!)
by IreneGi2I
Sun Nov 15, 2020 10:03 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 28

Re: Polarizability

The more electronegative the atom is, the less the atom will be polarizable. It is because high electronegative atoms have electrons being tightly held together. Also, larger atoms are more polarizable because the volume which electrons occupy increases (larger electron clouds). Since larger electro...
by IreneGi2I
Sun Nov 15, 2020 9:57 pm
Forum: Lewis Structures
Topic: Sapling Week 5/6 HW #3
Replies: 7
Views: 50

Re: Sapling Week 5/6 HW #3

I agree with Hayden that we would not be required to memorize the formulas for the test. Just in case, I think I will review some practice questions of this kind before the exam to familiarize myself with basic structures of formulas!
by IreneGi2I
Sun Nov 15, 2020 9:53 pm
Forum: Lewis Structures
Topic: Lewis acids and bases
Replies: 23
Views: 128

Re: Lewis acids and bases

Just to add, anions are rich in electrons so they donate their electrons (Anions are Lewis base)!
by IreneGi2I
Sun Nov 15, 2020 9:50 pm
Forum: Lewis Structures
Topic: Bond Lengths
Replies: 1
Views: 27

Re: Bond Lengths

In this case, the expected C-O single bond length is 143pm and C=O double bond length is 112pm. Since the observed bond length of C-O is 128pm, it indicates that the bond between C and O has the intermediate length between the single bond and double bond. If C-O has overwhelmingly single bond charac...
by IreneGi2I
Sun Nov 15, 2020 9:40 pm
Forum: Formal Charge and Oxidation Numbers
Topic: The most plausible structure
Replies: 4
Views: 34

The most plausible structure

I'm still a little confused what the most plausible structure would be based on formal charges. If a structure has more numbers of atoms with 0 formal charge, is this structure would be the most plausible one? Also, according to the Sapling homework, it says that negative formal charge should be on ...
by IreneGi2I
Sun Nov 08, 2020 6:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Covalent character vs. Ionic character
Replies: 4
Views: 47

Re: Covalent character vs. Ionic character

Also, just to add, solubility is the characteristic of ionic compound. When we compare two ionic compounds, one ionic compound that is less soluble can be said that it has more covalent characteristic!
by IreneGi2I
Sun Nov 08, 2020 6:21 pm
Forum: Electronegativity
Topic: determining electronegativity
Replies: 31
Views: 263

Re: determining electronegativity

I don't think we would have to know how to calculate the actual electronegativity values. Since electronegativity is how strong an atom attracts electrons, you can memorize that fluorine has the strongest electronegativity on periodic table to find the general trend. F is located on the upper-right ...
by IreneGi2I
Sun Nov 08, 2020 6:15 pm
Forum: Ionic & Covalent Bonds
Topic: London dispersion forces
Replies: 12
Views: 57

Re: London dispersion forces

London dispersion forces are the same as Van der Waals forces or dipole-induced dipole. It basically explains the 'temporary attractive force' in an atom in which electrons are located more on the one side of the atom by random and instant chance. Since one side of atom has more electrons instantane...
by IreneGi2I
Sun Nov 08, 2020 6:09 pm
Forum: Ionic & Covalent Bonds
Topic: Silver Halides
Replies: 3
Views: 23

Re: Silver Halides

As size of the atom increases, it will have more distorted structure, which means that it will have more covalent characteristic. Since solubility is a characteristic of ionic compound, as covalent characteristic gets stronger, it will be less soluble.
by IreneGi2I
Sun Nov 08, 2020 6:06 pm
Forum: Ionic & Covalent Bonds
Topic: Classifying Distortion
Replies: 4
Views: 37

Re: Classifying Distortion

I am not sure about how to experimentally measure the degree of distortion, but I remember Dr. Lavelle mentioned that the degree of distortion has to do with the size of atom. For example, valence electrons in larger atoms have less attraction toward the positive nucleus of the atom (compared to sma...
by IreneGi2I
Sun Nov 01, 2020 8:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B Winter 2021
Replies: 7
Views: 69

Re: Chem 14B Winter 2021

Yes, I believe it would be in similar format as this class!
by IreneGi2I
Sun Nov 01, 2020 8:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Outline Topic
Replies: 3
Views: 41

Re: Outline Topic

Also, just to add, there is an electron shielding effect in multi-electron atom. Electron shielding effect is that the outermost electrons are attracted less toward the positive nucleus because there are other electrons between outermost electrons and the nucleus (basically interfering the attractio...
by IreneGi2I
Sun Nov 01, 2020 8:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Pauli Exclusion Principle
Replies: 2
Views: 45

Re: Pauli Exclusion Principle

I think the above comment has explained the concept very well. Pauli Exclusion Principle basically states that there cannot be multiple electrons in the same electron configuration. If there is an electron in n =1, l = 0, m1 = -1, ms = -1/2, this 'state' cannot be occupied by two or more electrons (...
by IreneGi2I
Sun Nov 01, 2020 8:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How to Calculate Ground State
Replies: 3
Views: 23

Re: How to Calculate Ground State

When in excited state, the orbital is skipped to the next level. You can think of the ground state as 'regular' that we normally calculate for electron configuration. If an atom's electron configuration skips to the next level without filling the whole orbitals, then the atom is in exited state.
by IreneGi2I
Wed Oct 28, 2020 5:06 am
Forum: Limiting Reactant Calculations
Topic: M9
Replies: 3
Views: 45

Re: M9

For the midterm 1, are we supposed to know how to construct the net ion equation?
by IreneGi2I
Sun Oct 25, 2020 6:34 am
Forum: Empirical & Molecular Formulas
Topic: Midterm - Chemical compund equations?
Replies: 7
Views: 60

Re: Midterm - Chemical compund equations?

Yes I agree that we will not be required to know how to name complex compounds, but I recommend you to look up the nomenclature sheet on chemistry website just for your own sake!
by IreneGi2I
Sun Oct 25, 2020 6:32 am
Forum: Balancing Chemical Reactions
Topic: Chemical Compounds
Replies: 4
Views: 49

Re: Chemical Compounds

Yes I have also been told that we will not be required to know how to write complex compounds for the test, but as Dr. Lavelle said in the lecture, I think we have to know how the combustion works! (the reactants and products of combustion reaction)
by IreneGi2I
Sun Oct 25, 2020 6:28 am
Forum: SI Units, Unit Conversions
Topic: units to know for midterm
Replies: 11
Views: 152

Re: units to know for midterm

Those that are used frequently (like pm, nm, angstrom) are written on constant sheet (on Chemistry website). I recommend you to look that up!
by IreneGi2I
Sun Oct 25, 2020 6:24 am
Forum: Significant Figures
Topic: Midterm
Replies: 9
Views: 117

Re: Midterm

I don't think there will be questions with answer choices dealing with specific sig figs difference. I think the answer choices will be fairly distinct from each other.
by IreneGi2I
Sun Oct 25, 2020 6:21 am
Forum: SI Units, Unit Conversions
Topic: Midterm
Replies: 26
Views: 230

Re: Midterm

So the midterm will consist of multiple-choice questions, and I expect them to be generally calculation-based!
by IreneGi2I
Sun Oct 18, 2020 6:41 pm
Forum: Properties of Light
Topic: Study Advice
Replies: 50
Views: 306

Re: Study Advice

Personally, I watch Khan Academy videos after I watch lecture videos and there are something I found confusing. It helps me a lot to clarify some concepts. I think it's better to solve the textbook problems first. If the problems are challenging, then going to Step Up sessions will be very helpful. ...
by IreneGi2I
Sun Oct 18, 2020 6:33 pm
Forum: Properties of Light
Topic: Diatomic Molecules
Replies: 2
Views: 22

Re: Diatomic Molecules

In some cases, we need to know which element exists in diatomic structure in its natural state. I think H, O, and N are the ones which are especially important to know, and also useful in problem solving!
by IreneGi2I
Sun Oct 18, 2020 6:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition
Replies: 2
Views: 40

Re: Bohr Frequency Condition

Hi, when you calculate Delta E, the Delta E (change in energy) = E (Final) - E (Initial). So, for example, let's assume we need to calculate the Delta E when an electron loses its energy and comes down to the second quantum level from the third level. The initial n=3, and the final n=2 (n represents...
by IreneGi2I
Sun Oct 18, 2020 6:15 pm
Forum: Empirical & Molecular Formulas
Topic: F3 Part A (Textbook)
Replies: 6
Views: 47

Re: F3 Part A (Textbook)

I think the compound formula will be given in the test!
by IreneGi2I
Sun Oct 18, 2020 6:11 pm
Forum: Balancing Chemical Reactions
Topic: L.35 Balancing Third Equation
Replies: 4
Views: 47

Re: L.35 Balancing Third Equation

Yes, there is an error in this question! You can find 'Solutions Manual Errors' on Chem14A website.
by IreneGi2I
Sun Oct 11, 2020 5:44 am
Forum: Empirical & Molecular Formulas
Topic: Ratios for empircal formulas
Replies: 6
Views: 68

Re: Ratios for empircal formulas

So, if you got the empirical formula, then you can calculate the molar mass of the compound. Then, to get the molecular formula from this empirical formula, you should divide the given molar mass of compound (which will be given in the question) by the molar mass of compound you calculated from empi...
by IreneGi2I
Sun Oct 11, 2020 5:21 am
Forum: Molarity, Solutions, Dilutions
Topic: Formulas involved in Determining Solution Concentration
Replies: 8
Views: 88

Re: Formulas involved in Determining Solution Concentration

So, basically, M (molarity) = n (moles of solute) / V (volume of solution). In the question that deals with dilution of solution, n (moles of solute) does not change even if we add more solution to the existing solution to dilute it. From this, we can derive the formula M(initial)*V(initial) = M(fin...
by IreneGi2I
Sun Oct 11, 2020 5:08 am
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW question
Replies: 4
Views: 111

Re: Sapling HW question

I also had problem with this one because I had no idea how to calculate the molar masses of 2-butanone and 3-methyl-3-hexanol. I actually looked them up on the internet, and according to TA, we would not have to know how to calculate these molar masses! I think those molar masses will be given in th...
by IreneGi2I
Sun Oct 11, 2020 5:04 am
Forum: Limiting Reactant Calculations
Topic: #10 Week 1 HW
Replies: 8
Views: 92

Re: #10 Week 1 HW

d represents density (g/ml). So, if there is 40ml of an element which has d of 0.5, then the mass of element would be 20g (multiply 40ml * 0.5g/ml)!
by IreneGi2I
Sun Oct 11, 2020 5:00 am
Forum: Limiting Reactant Calculations
Topic: Determining Limiting Reactant
Replies: 7
Views: 99

Re: Determining Limiting Reactant

Yes! As many people above explained, if the ratio of two are 1:1 (which is very rare), then there would be no limiting reagent.
by IreneGi2I
Sun Nov 10, 2019 8:35 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability for Final
Replies: 2
Views: 84

Polarizability for Final

Since final is cumulative, I was wondering if we have to know how to calculate polarizability for final. I think midterm did not really ask any questions about it, but just to make sure, do you all think we should study on this topic in depth for final?
by IreneGi2I
Sun Nov 10, 2019 8:33 pm
Forum: Administrative Questions and Class Announcements
Topic: What homework to turn in per week
Replies: 7
Views: 105

Re: What homework to turn in per week

I think you'll be fine to submit problems from Chemical Bonds for week 7 homework.
by IreneGi2I
Sun Nov 10, 2019 8:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 4
Views: 100

Re: Test 2

I guess materials that test 2 will cover might be affected by a cancelled class due to fire. Since test 2 is coming up, I believe Dr. Lavelle will notice us in this week.
by IreneGi2I
Sun Nov 10, 2019 8:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Second Discussion Test
Replies: 9
Views: 198

Re: Second Discussion Test

Yes, test 2 will start from week 8 during your discussion session like test 1. I think the materials it'll cover will depend on the pace of class. Since there was a cancelled class due to fire, I guess it will cover maybe a little less materials than previous quarters.
by IreneGi2I
Sun Nov 10, 2019 8:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Commuters
Replies: 3
Views: 88

Re: Commuters

I am a commuter, too. As a commuter who live far from the campus, I usually spend extra time between classes and review sessions to study or do assignments. Since libraries open until late night, I study there until the review sessions so that I can rest at home after the sessions. I can feel that i...
by IreneGi2I
Tue Oct 29, 2019 3:25 pm
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 117

Re: Study For midterm

Attending review sessions would help you along with solving practice problems. Dr. Lavelle mentioned that he will arrange many review sessions, so you would be able to attend the one that is convenient for you!
by IreneGi2I
Tue Oct 29, 2019 3:22 pm
Forum: Ionic & Covalent Bonds
Topic: 4f, 5f Electron Configurations
Replies: 2
Views: 46

4f, 5f Electron Configurations

Hi, I am a little bit confused about how to write 4f, 5f subshells in electron configurations, and what orders do I need to put. Like 3d comes before 4s, is the order f-d-s-p?
I would really appreciate if you can explain this with examples!
by IreneGi2I
Tue Oct 29, 2019 3:12 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons?
Replies: 15
Views: 261

Re: Valence Electrons?

I found this chart on the Internet, and I think it will help you a lot!
by IreneGi2I
Tue Oct 29, 2019 3:09 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 244

Re: Midterm

I think Dr. Lavelle will give announcements about midterm at the lecture tomorrow. He will post information about midterm locations, too.
by IreneGi2I
Tue Oct 29, 2019 3:07 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 483

Re: Midterm

Yes, as someone said above, I think it will cover Fundamentals, Quantum world, and some concepts of Chemical Bonds. I recommend you to attend midterm review sessions as they will go over concepts that we need to know for midterm!
by IreneGi2I
Tue Oct 22, 2019 12:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find what material you missed if you missed a class?
Replies: 4
Views: 73

Re: Where to find what material you missed if you missed a class?

Yes, I also recommend you to go UA sessions or workshops if you missed lectures. They generally cover materials from previous lectures, so they would help you catch up.
by IreneGi2I
Tue Oct 22, 2019 12:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 4 homework problems
Replies: 5
Views: 89

Re: Week 4 homework problems

So, for this week, are we not allowed to do questions in 1E section? (I thought that Dr. Lavelle explained about the electron configurations)
by IreneGi2I
Tue Oct 22, 2019 12:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals 1D.19
Replies: 3
Views: 108

Re: Orbitals 1D.19

First of all, s-subshell is l=0, p-subshell is l=1, d-subshell is l=2, f-subshell is l=3 For (a), it is 4p-subshell, so l= 1. If l=1, ml can be -1, 0, 1. Therefore, 4p-subshell can have 3 orbitals. For (b), it is 3d-subshell, so l=2. If l=2, ml can be -2, -1, 0, 1, 2. Therefore, 3d-subshell can have...
by IreneGi2I
Tue Oct 22, 2019 12:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 4
Views: 91

Re: Quantum Number

There is no equation, but I found this chart very useful understanding & finding quantum numbers!
by IreneGi2I
Tue Oct 22, 2019 12:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: G-subshell
Replies: 3
Views: 86

G-subshell

Regarding the 1D.25, I understand that g-subshell can exist. But what is the minimum n that can have g-subshell?
by IreneGi2I
Sun Oct 20, 2019 11:14 am
Forum: *Black Body Radiation
Topic: What do I really need to know?
Replies: 6
Views: 287

Re: What do I really need to know?

Black bodies are kind of an imaginary object that absorbs all types of wavelength. For now, I believe that we do not need to study about this in depth for tests.
by IreneGi2I
Sun Oct 20, 2019 11:11 am
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Comment Points
Replies: 1
Views: 45

Chem Community Comment Points

Hi, I am wondering if there is any way for us to check our points for weekly Chemistry Community comments?
by IreneGi2I
Sun Oct 20, 2019 11:07 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shell, Subshell, Orbital Terminology
Replies: 8
Views: 228

Re: Shell, Subshell, Orbital Terminology

I have a little confusion about shell (n). How do we determine what n is?
by IreneGi2I
Sun Oct 20, 2019 10:55 am
Forum: Administrative Questions and Class Announcements
Topic: UA Session and Step-Up Program
Replies: 4
Views: 81

UA Session and Step-Up Program

Hi, I haven't been to UA sessions or step-up sessions yet, but I have some questions about these sessions. Does UA session/Step-up session cover materials relevant to each week's classes? (Can I ask questions or get help to solve problems of previous weeks?) Also, can I just drop by the office to at...
by IreneGi2I
Sun Oct 20, 2019 10:50 am
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 3
Views: 46

Re: Modules

I asked a question about this because I thought the modules would be updated weekly. And I believe all modules have already been posted. These modules are relevant for week 0 and 1 to assist studying high school chemistry concepts.
by IreneGi2I
Sun Oct 13, 2019 4:31 pm
Forum: Properties of Light
Topic: SI units and wavelength
Replies: 6
Views: 62

Re: SI units and wavelength

As people mentioned above, I also think you should always check the units very carefully in tests (whether it is m or nm, or any other units)!
by IreneGi2I
Sun Oct 13, 2019 4:28 pm
Forum: Properties of Light
Topic: Photoelectric vs. Atomic spectra
Replies: 4
Views: 72

Photoelectric vs. Atomic spectra

HI, I am reviewing lecture notes, but I have a question about photoelectric effect and atomic spectroscopy. Professor Lavelle mentioned about the difference between photoelectric effect and atomic spectroscopy, but I could not find the answer on my notes. Can someone explain what is different betwee...
by IreneGi2I
Sun Oct 13, 2019 4:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Chapters Covered in Midterm?
Replies: 1
Views: 44

Chapters Covered in Midterm?

Hi, I am wondering what chapters will be covered in midterm. I am thinking about making a study plan ahead the midterm, but I am a little bit confused. Please let me know if you know about this!
by IreneGi2I
Sun Oct 13, 2019 4:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra help
Replies: 8
Views: 198

Re: Extra help

Personally, I use Chad's Prep for self-studying! It provides online lectures for free, and has been tons of help for me
by IreneGi2I
Sun Oct 13, 2019 4:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 HW Problem
Replies: 1
Views: 35

Re: Week 3 HW Problem

Yes, as far as I know, we are allowed to submit five questions from Quantum World only!
by IreneGi2I
Thu Oct 03, 2019 9:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Learning
Replies: 3
Views: 96

Re: Sapling Learning

I don't think Sapling Learning is required for the course. It is rather an additional practice program where you can get practice assignments, detailed solutions, etc.
by IreneGi2I
Thu Oct 03, 2019 9:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Modules Update Date
Replies: 2
Views: 23

Re: Audio-Visual Modules Update Date

Thank you for the reply!
by IreneGi2I
Thu Oct 03, 2019 9:53 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 395

Re: Avogadro's Number?

Do you think we will have to memorize the Avogadro's Number for test? I am wondering if I will be given the Avogadro's Number when I get the questions that ask for atoms' number.
by IreneGi2I
Thu Oct 03, 2019 9:50 pm
Forum: Significant Figures
Topic: Practical Application of Sig Figs?
Replies: 3
Views: 61

Practical Application of Sig Figs?

Hi, I am wondering how sig fig rules are applied to problems. I know the rules of Sig Figs, but I am not so sure about how they are used in practical sense. If you can give me an example, I would greatly appreciate it! Also, will I have to study heavily on this concept for the test?
by IreneGi2I
Thu Oct 03, 2019 9:43 pm
Forum: SI Units, Unit Conversions
Topic: Book Access Issues
Replies: 3
Views: 101

Re: Book Access Issues

Hi, I am having the same issue. I want to get refund from UCLA and purchase it directly from Macmicllan learning. Is it possible to get refund for online e-textbook? I contacted UCLA store and they kept responding that the order is still processing. If someone knows about it, please let me know!
by IreneGi2I
Thu Oct 03, 2019 9:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Modules Update Date
Replies: 2
Views: 23

Audio-Visual Modules Update Date

Hi, does anyone know when are weekly audio-visual modules updated on Chem14A website? I checked the all the modules for week 2 have updated, but I am not sure when the other modules will be posted. Does Dr. Lavelle usually post them on Sunday of every week?

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