Search found 45 matches

by Sona Hakobyan 3J
Sat Dec 08, 2018 8:26 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Churro #34
Replies: 1
Views: 60

Churro #34

Can someone please explain Churro #34?
Grace sees her crush and panics, accidentally dropping 382.7 mg of HCl and 147.1 mg CaO into a 1L flask. After filling that flask with water up to the 1L mark, what is the pH of the resulting solution?

I don't know where to start.
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:34 pm
Forum: Naming
Topic: Polarizability
Replies: 2
Views: 82

Re: Polarizability

Polarizing Power- The smaller and more highly charged, the higher polarizing power it has
Polarizability- The bigger it is and more electrons it has, the more polarizable it is
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:31 pm
Forum: Photoelectric Effect
Topic: work function
Replies: 4
Views: 233

Re: work function

This is not possible. Please provide the question you're referring to; that might help to explain.
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:30 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH of acids
Replies: 8
Views: 229

Re: pH of acids

https://upload.wikimedia.org/wikipedia/ ... ale-01.jpg
Take a a look at this scale. The lower the PH, the more acidic it is. Thus, the stronger the acid, the lower its PH.
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:28 pm
Forum: Trends in The Periodic Table
Topic: atomic radius
Replies: 2
Views: 182

Re: atomic radius

Yes. Most importantly, you need to know that it is indicative of an atom's size. The greater the atomic radius, the bigger the atom.
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:26 pm
Forum: Properties of Light
Topic: Frequency
Replies: 1
Views: 198

Re: Frequency

Frequency is the number of times a point on a wave passes a fixed reference point in one second (remember waves oscillate). All you need to know is the frequency is measured in Hz (Hertz)
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:24 pm
Forum: Properties of Light
Topic: limiting reagents
Replies: 4
Views: 284

Re: limiting reagents

You determine limiting reactant by seeing which reactant will run out first in a reaction. Thus, you can figure this out by finding the mass of product each reactant produces. Whichever produces less of the product will therefore be the limiting reactant. Percent yield= actual yield/theoretical yiel...
by Sona Hakobyan 3J
Sat Dec 08, 2018 7:22 pm
Forum: Trends in The Periodic Table
Topic: electronegativity
Replies: 2
Views: 198

Re: electronegativity

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It increases across and decreases down the periodic table.
by Sona Hakobyan 3J
Sat Dec 08, 2018 3:57 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids and Bases
Replies: 5
Views: 214

Acids and Bases

Can someone summarize the key things we should know about acids and bases for the final?
by Sona Hakobyan 3J
Thu Dec 06, 2018 5:43 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
Replies: 1
Views: 72

Re: London dispersion forces

Did you get marked off specifically for that? There is London Dispersion forces on between all molecules so that does not make sense..
by Sona Hakobyan 3J
Thu Nov 29, 2018 2:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 7th edition 2E.1 mistake ?
Replies: 6
Views: 139

Re: 7th edition 2E.1 mistake ?

If you look at AX2E3 in Figure 2E. 7 on page 113 you will see that it is possible to have a linear structure with 3 lone pairs.
by Sona Hakobyan 3J
Thu Nov 29, 2018 2:16 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: 2D.9 vs 2D.11 in 7th edition
Replies: 1
Views: 67

Re: 2D.9 vs 2D.11 in 7th edition

Yes there is a difference. Cations have high polarizing power if they are small and highly charged because they have a higher ability to distort e- cloud of the anion because their positive center pulls in the electrons from the anion. On the other hand, anions polarizability increases with their si...
by Sona Hakobyan 3J
Sun Nov 25, 2018 9:32 pm
Forum: Hybridization
Topic: promoted hybridization
Replies: 4
Views: 88

Re: promoted hybridization

505095793 wrote:What does it mean when an electron is promoted? Also, what effect does electron promotion play on the overall molecule or atom?

I don't think this is something we need to know as Dr. Lavelle has not covered this topic in class.
by Sona Hakobyan 3J
Sun Nov 25, 2018 9:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 645

Re: Test 3

Hanlin Zhu 4G wrote:I think different intermolecular interactions is also included in the test.

Can you elaborate on this?
by Sona Hakobyan 3J
Sun Nov 25, 2018 9:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test
Replies: 5
Views: 119

Re: Test

I would think the test would cover everything after the midterm up until hybridization.
by Sona Hakobyan 3J
Sun Nov 18, 2018 6:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 7
Views: 269

Re: Grades

It was also mentioned in a previous post that there might be a 3-5 percent curve based on class average.
by Sona Hakobyan 3J
Thu Nov 15, 2018 7:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR model
Replies: 3
Views: 70

Re: VSEPR model

Because the bonds are still within the same region and repel other regions of electrons.
by Sona Hakobyan 3J
Thu Nov 15, 2018 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Thanksgiving [ENDORSED]
Replies: 14
Views: 314

Re: Thanksgiving [ENDORSED]

I'm pretty sure we won't have lecture as long as people don't ask too many questions during the lectures leading up to it! :)
by Sona Hakobyan 3J
Thu Nov 15, 2018 7:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion posts grading (Anyone have a grade for this yet?)
Replies: 3
Views: 135

Re: Discussion posts grading (Anyone have a grade for this yet?)

I think this is something they may end up posting in the end. As long as you are doing 3 posts a week, you shouldn't be worried.
by Sona Hakobyan 3J
Sun Nov 11, 2018 5:06 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: Dipole Moment
Replies: 2
Views: 74

Re: Dipole Moment

Dipole moments occur when there is a separation of charge. They can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity. The larger the difference in electronegativity, the larger the dipole moment. The distance betw...
by Sona Hakobyan 3J
Sun Nov 11, 2018 5:05 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: Intermolecular Forces
Replies: 4
Views: 66

Re: Intermolecular Forces

I thought these are both names, in addition to some others, for the same forces--and therefore the same strength. I'm not 100 percent sure. Anyone know for sure?
by Sona Hakobyan 3J
Sun Nov 11, 2018 5:02 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 9
Views: 192

Re: Expanded Octets

Any element that has or can have a d orbital (aka period 3 and beyond)
by Sona Hakobyan 3J
Sun Nov 11, 2018 4:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Due Week 7
Replies: 10
Views: 296

Re: Homework Due Week 7

I think we do recent homework as prep for whatever test is coming up; so, I think outline 3 would be fine.
by Sona Hakobyan 3J
Sun Nov 04, 2018 10:17 pm
Forum: SI Units, Unit Conversions
Topic: Review Session Notes
Replies: 3
Views: 254

Re: Review Session Notes

This is great practice :)
by Sona Hakobyan 3J
Sun Nov 04, 2018 10:06 pm
Forum: Ionic & Covalent Bonds
Topic: Chem Midterm
Replies: 13
Views: 177

Re: Chem Midterm

Celine Hoh 4H wrote:Do we need a blue book for the test?


No need for a blue book!
by Sona Hakobyan 3J
Sat Nov 03, 2018 8:53 pm
Forum: Properties of Electrons
Topic: How do we determine the possible number of electrons when given ml?
Replies: 4
Views: 299

Re: How do we determine the possible number of electrons when given ml?

ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons. Can you further explain this? Still confused. Sure! T...
by Sona Hakobyan 3J
Sat Nov 03, 2018 1:07 pm
Forum: General Science Questions
Topic: Schrodinger
Replies: 2
Views: 80

Re: Schrodinger

I think that if it is in any way on the midterm, it will be conceptual.
by Sona Hakobyan 3J
Sat Nov 03, 2018 1:06 pm
Forum: Properties of Electrons
Topic: How do we determine the possible number of electrons when given ml?
Replies: 4
Views: 299

Re: How do we determine the possible number of electrons when given ml?

ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons.
by Sona Hakobyan 3J
Fri Nov 02, 2018 8:14 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm study
Replies: 7
Views: 233

Re: Midterm study

Chloe Orsini 1K wrote:I was thinking of doing a massive group me! We can use it to get together and study or ask questions and stuff like that! I could make one and add y'all and then you guys could add your friends who are interested too, does this work?


Sounds great!
by Sona Hakobyan 3J
Wed Oct 31, 2018 7:31 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm study
Replies: 7
Views: 233

Re: Midterm study

Also down:) My name is Sona Hakobyan
by Sona Hakobyan 3J
Thu Oct 25, 2018 9:42 am
Forum: Administrative Questions and Class Announcements
Topic: HW for this week [ENDORSED]
Replies: 4
Views: 174

Re: HW for this week [ENDORSED]

Anyone know the answer? I am also curious.
by Sona Hakobyan 3J
Wed Oct 24, 2018 5:13 pm
Forum: Properties of Electrons
Topic: spectroscopy
Replies: 1
Views: 121

Re: spectroscopy

This describes it in depth: "It’s the energy level. With spectroscopy you are measuring how energy is absorbed, emitted, and or reflected. In molecular spectroscopy you are looking at interactions with bonding electrons in the outer valence shell. The interactions change according to the struct...
by Sona Hakobyan 3J
Wed Oct 24, 2018 4:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Online Modules
Replies: 4
Views: 130

Re: Online Modules

taline_n wrote:I asked a UA and she said that no more online modules will be posted for the rest of the quarter.

Did she/he say why?
by Sona Hakobyan 3J
Wed Oct 24, 2018 4:19 pm
Forum: Properties of Light
Topic: Quantum Test
Replies: 11
Views: 357

Quantum Test

Hi all,
I seem to be having a lot of trouble with the quantum section. It is always very confusing to be as to which equations I should be using and when? Is there any sources you guys can provide that you think helped you for the test?
by Sona Hakobyan 3J
Fri Oct 19, 2018 10:36 am
Forum: DeBroglie Equation
Topic: 6th HW 1.23 What is KeV?
Replies: 5
Views: 109

Re: 6th HW 1.23 What is KeV?

You need to know the following equations and conversions:
KeV = kilo-electric volt (multiply quantity by 1000)
1.602 x 10^-19 J = 1 eV
E = hc/lambda
by Sona Hakobyan 3J
Fri Oct 19, 2018 10:30 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 1D.9
Replies: 3
Views: 119

Re: Problem 1D.9

Someone correct me if I'm wrong, but I believe if he doesn't cover it in class or his video modules, then we don't need to know it.
by Sona Hakobyan 3J
Fri Oct 19, 2018 10:27 am
Forum: Administrative Questions and Class Announcements
Topic: Test Average
Replies: 4
Views: 165

Test Average

Does anyone know what the test average for the first test was?
by Sona Hakobyan 3J
Sun Oct 14, 2018 9:46 pm
Forum: Student Social/Study Group
Topic: Note Taking
Replies: 32
Views: 1528

Re: Note Taking

For me the most effective way is using google docs because when I hand write notes I cannot read my writing. However, for graphs and other pictures I like to draw them in my notebook and label them as figures in my notes. I do believe that if I had better handwriting, hand writing my notes would be ...
by Sona Hakobyan 3J
Sun Oct 14, 2018 9:43 pm
Forum: Properties of Light
Topic: Test 2
Replies: 17
Views: 269

Re: Test 2

Everything regarding test 2 should be on outline 2 :)
by Sona Hakobyan 3J
Wed Oct 10, 2018 8:43 pm
Forum: Limiting Reactant Calculations
Topic: Test 1
Replies: 8
Views: 463

Test 1

For those who have taken the test, do you think the difficulty is the same level as the homework and modules? In other words, would studying these two be sufficient to do well on the exam? If you have any sources that helped you be better prepared, please let me know !
by Sona Hakobyan 3J
Fri Oct 05, 2018 3:28 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula (HW problem F.11, part a)
Replies: 2
Views: 58

Re: Empirical Formula (HW problem F.11, part a)

Yes it is safe to round up these numbers. I've heard that the numbers have to be within 5 percent of the next closest integer to be rounded. .
by Sona Hakobyan 3J
Fri Oct 05, 2018 3:23 am
Forum: Limiting Reactant Calculations
Topic: multiple limiting reactants
Replies: 9
Views: 161

Re: multiple limiting reactants

This would not be likely because if there were two reactants with the same mole ratio and are consumed the exact same, then there could be no limiting reactant.
by Sona Hakobyan 3J
Fri Oct 05, 2018 3:18 am
Forum: Balancing Chemical Reactions
Topic: Balancing reactions tips
Replies: 29
Views: 798

Re: Balancing reactions tips

I start with whichever element is in the equation the least. Also I tend to do single elements last for example O2 or H2. This way you get everything out the way and however many O's or H's there turn out to be in the different products or reactants, it wont matter because we can account for them wi...
by Sona Hakobyan 3J
Fri Oct 05, 2018 3:13 am
Forum: Empirical & Molecular Formulas
Topic: Empirical formula from MPC
Replies: 3
Views: 72

Re: Empirical formula from MPC

Empirical Formulas requires the simplest whole number ratio in a compound, therefore it would be 3:4:3.

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