Search found 53 matches

by Maya Serota 3G
Sun Dec 08, 2019 11:06 pm
Forum: Student Social/Study Group
Topic: most stable
Replies: 6
Views: 222

Re: most stable

It doesn't necessarily mean that the molucule will be more stable, but molecules with more lone pairs will have smaller bond angles due to electron repulsion.
by Maya Serota 3G
Sun Dec 08, 2019 11:04 pm
Forum: Air Pollution & Acid Rain
Topic: Final Exam
Replies: 4
Views: 274

Re: Final Exam

The formula in the textbook was discussed in the box that was on the syllabus.
by Maya Serota 3G
Sun Dec 08, 2019 10:59 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A FInal
Replies: 6
Views: 133

Re: 14A FInal

I believe scores will be posted in about two weeks but we pick up our physical exams the second week of winter quarter.
by Maya Serota 3G
Sun Dec 08, 2019 10:56 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 4
Views: 185

Re: Final

It is similar to one of the questions that was reviewed in the final review session on Friday night.
by Maya Serota 3G
Sun Dec 08, 2019 10:52 pm
Forum: Calculating the pH of Salt Solutions
Topic: OH- and H+
Replies: 6
Views: 159

Re: OH- and H+

Acids release H+ (hydronium) ions into the solution and bases release OH-(hydroxide) ions.
by Maya Serota 3G
Sun Dec 08, 2019 10:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Nitro vs Nitrito
Replies: 6
Views: 177

Re: Nitro vs Nitrito

It will be written as NO2 when it's nitro and ONO when it's nitrito.
by Maya Serota 3G
Mon Dec 02, 2019 12:03 am
Forum: Amphoteric Compounds
Topic: Memorizing Amphoteric Oxides
Replies: 2
Views: 45

Re: Memorizing Amphoteric Oxides

My TA said that we will need to be able to recognize it, but we will most likely not be given something ambiguous on the border of the diagonal.
by Maya Serota 3G
Mon Dec 02, 2019 12:01 am
Forum: Lewis Acids & Bases
Topic: Difference
Replies: 4
Views: 78

Re: Difference

We will need to be able to identify when a reactant is an acid, but my discussion was told it will not be ambiguous.
by Maya Serota 3G
Sun Dec 01, 2019 11:59 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids and Bases
Replies: 4
Views: 64

Conjugate Acids and Bases

Could someone explain exactly what it means when a product is a conjugate acid or base? Thank you!
by Maya Serota 3G
Sun Dec 01, 2019 11:55 pm
Forum: Polyprotic Acids & Bases
Topic: ligands
Replies: 4
Views: 124

Re: ligands

Ligands are Lewis bases. They have at least one pair of electrons that they donate to a metal atom/ion.
by Maya Serota 3G
Sun Dec 01, 2019 11:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Monday's Lecture
Replies: 2
Views: 57

Monday's Lecture

Will Dr. Lavelle be going over what he taught in lecture on Wednesday in lecture tomorrow?
by Maya Serota 3G
Mon Nov 25, 2019 12:27 am
Forum: Administrative Questions and Class Announcements
Topic: Week 9 Homework
Replies: 2
Views: 56

Re: Week 9 Homework

The only instructions on the syllabus are to do the homework on relevante topics so I assume molecular structure and acids and bases. Also Dr. Lavelle said we will be able to turn in both week 9 and week 10 homework during week 10.
by Maya Serota 3G
Mon Nov 25, 2019 12:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR formula
Replies: 5
Views: 42

Re: VSEPR formula

We will only need to be able to make comparisons to the bond angles discussed in class and understand why bond angles might be smaller or larger due to electron repulsion.
by Maya Serota 3G
Mon Nov 25, 2019 12:16 am
Forum: Administrative Questions and Class Announcements
Topic: Final Practice
Replies: 3
Views: 110

Re: Final Practice

I believe the TAs will hold review sessions for the final in which they go over past exam questions and explain the answers, but we have not been given access to a entire final exam and it’s answer key.
by Maya Serota 3G
Mon Nov 25, 2019 12:09 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Methanol's shape
Replies: 1
Views: 41

Re: Methanol's shape

It has two centers. The carbon is has tetrahedral electron geometry and tetrahedral molecular geometry. The Oxygen has tetrahedral electron geometry and bent molecular geometry.
by Maya Serota 3G
Mon Nov 25, 2019 12:03 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 5
Views: 74

Final Exam

What percentage of our grade is the final exam worth?
by Maya Serota 3G
Sun Nov 17, 2019 11:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance and VSEPR
Replies: 9
Views: 102

Re: Resonance and VSEPR

No ! They don’t determine or change a molecules shape when drawing the VSEPER models.
by Maya Serota 3G
Sun Nov 17, 2019 11:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 5
Views: 98

Re: Repulsion Strength

Lone pairs are close to each other than any other combination of pairs. Therefore lone -lone have the greatest repulsion strength.
by Maya Serota 3G
Sun Nov 17, 2019 11:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 4
Views: 75

Re: VSEPR Notation

A = the central atom, X = an atom bonded to A, E = a lone pair on A.
by Maya Serota 3G
Sun Nov 17, 2019 11:07 pm
Forum: Student Social/Study Group
Topic: Bond Angles
Replies: 6
Views: 99

Re: Bond Angles

We just need to know comparisons, not exact bong angles.
by Maya Serota 3G
Sun Nov 17, 2019 10:47 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: Hydrogen bonding
Replies: 1
Views: 25

Re: Hydrogen bonding

Since Hydrogen bonds are so strong, a greater amount of energy is needed to separate them. Thus molecules with hydrogen bonds typically have higher boiling / melting points.
by Maya Serota 3G
Sun Nov 10, 2019 9:58 pm
Forum: Electronegativity
Topic: Atom size
Replies: 16
Views: 648

Re: Atom size

As you go up a group and across a period to the right, electronegativity increases. If you go down a group and to the left on the periodic table, atom size increases.
by Maya Serota 3G
Sun Nov 10, 2019 9:56 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity in between 1.5 and 2
Replies: 2
Views: 45

Re: Electronegativity in between 1.5 and 2

If this is the case you can’t conclude what type of bond it is. My TA said that we won’t be given something ambiguous.
by Maya Serota 3G
Sun Nov 10, 2019 9:51 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 3
Views: 57

Re: Drawing Resonance Structures

Yes, you draw all of the possible structures. This does not depict the real molecule but gets as accurate as possible with Lewis Structure diagrams.
by Maya Serota 3G
Sun Nov 10, 2019 9:49 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi
Replies: 11
Views: 183

Re: Sigma vs Pi

Sigma bonds are formed by end-to-end overlapping of atomic orbitals and Pi bonds are when the lobe of one atomic orbital overlaps another
by Maya Serota 3G
Sun Nov 10, 2019 9:42 pm
Forum: Dipole Moments
Topic: Hydrogen Bonding
Replies: 6
Views: 63

Re: Hydrogen Bonding

Hydrogen bonds are the strongest intermolecular bonds which is why water has such a high boiling point.
by Maya Serota 3G
Sun Nov 03, 2019 11:48 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 3
Views: 39

Re: Lewis Structures

You want to construct the bonds based on which structure results in the formal charges of each atom being closest to zero (unless you want a certain charge on the molecule)
by Maya Serota 3G
Sun Nov 03, 2019 11:46 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Manipulating for the initial energy level
Replies: 2
Views: 57

Re: Manipulating for the initial energy level

I find the first way more efficient, but as you said either way works.
by Maya Serota 3G
Sun Nov 03, 2019 11:41 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 11
Views: 134

Re: Bond lengths

The structure represents it that way because it is the best we can do, but in reality there aren’t actually double and single bonds like that.
by Maya Serota 3G
Sun Nov 03, 2019 11:39 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Best Formal Charge
Replies: 7
Views: 230

Re: Best Formal Charge

You want the most electronegative atom to carry any extra negative charge and the least electronegative atom to carry any extra positive charge.
by Maya Serota 3G
Sun Nov 03, 2019 11:36 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 200

Re: Formal charge

You just want to get as close to 0 as possible.
by Maya Serota 3G
Sun Oct 27, 2019 6:03 pm
Forum: Resonance Structures
Topic: Ideal Lewis Structure
Replies: 4
Views: 60

Re: Ideal Lewis Structure

You can't represent the actual structure -- that is a limitation of lewis structure diagrams. Any of the resonance structures you draw will be considered correct.
by Maya Serota 3G
Sun Oct 27, 2019 6:00 pm
Forum: Student Social/Study Group
Topic: Midterm Length
Replies: 7
Views: 137

Re: Midterm Length

The midterm is 120 minutes long and worth 120 points.
by Maya Serota 3G
Sun Oct 27, 2019 5:59 pm
Forum: Ionic & Covalent Bonds
Topic: HW 2A.21d
Replies: 5
Views: 80

Re: HW 2A.21d

I am also confused about this question. I looked it up and the answer differs on various websites. Anyone who can clarify would be much appreciated!
by Maya Serota 3G
Sun Oct 27, 2019 5:50 pm
Forum: Resonance Structures
Topic: Determining Resonance Structures
Replies: 6
Views: 85

Re: Determining Resonance Structures

A molecule can have resonance structures when it has a lone pair or a double bond on the atom next to a double bond.
by Maya Serota 3G
Sun Oct 27, 2019 5:47 pm
Forum: Properties of Electrons
Topic: Formal Charge of an Atom
Replies: 5
Views: 109

Formal Charge of an Atom

Could someone explain how the formal charge is assigned to an atom? Thank you!!
by Maya Serota 3G
Sun Oct 27, 2019 5:27 pm
Forum: Formal Charge and Oxidation Numbers
Topic: placement of the negative sign on charges
Replies: 4
Views: 100

Re: placement of the negative sign on charges

The standard nomenclature for writing the charge of an ion says to follow the number with the sign i.e. 2+
by Maya Serota 3G
Sun Oct 20, 2019 11:20 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 17
Views: 275

Re: Midterm

Yes I am pretty sure the the fundamentals covered in test 1 will also be on the midterm and final.
by Maya Serota 3G
Sun Oct 20, 2019 11:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Conceptual Understanding of Wave Function
Replies: 2
Views: 46

Re: Conceptual Understanding of Wave Function

To add to that a key concept Dr. Lavelle has pointed out many times is that orbitals are actually mathamatical equations; that will probably be helpful for the midterm.
by Maya Serota 3G
Sun Oct 20, 2019 11:07 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question about electron configurations for multi electron atoms
Replies: 2
Views: 36

Re: Question about electron configurations for multi electron atoms

There is no way to figure this out on th spot — Dr. Lavelle said we just need to have those two exceptions memorized.
by Maya Serota 3G
Sun Oct 20, 2019 11:02 pm
Forum: Einstein Equation
Topic: energy emitted by H electrons
Replies: 5
Views: 106

Re: energy emitted by H electrons

I believe Dr. Lavelle mentioned we would be going over multi-electron atoms in the next lecture.
by Maya Serota 3G
Sun Oct 20, 2019 11:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: quantum numbers
Replies: 2
Views: 49

Re: quantum numbers

You might be given something like 4s2 and will have to find the four quantum numbers associated with that electron. N would be 4 and you would go off of that.
by Maya Serota 3G
Sun Oct 13, 2019 8:34 pm
Forum: SI Units, Unit Conversions
Topic: Percent Yield
Replies: 6
Views: 254

Re: Percent Yield

The actual value will be given to you in the question. From there the equation for percent yield is (theoretical/actual) x 100.
by Maya Serota 3G
Sun Oct 13, 2019 8:33 pm
Forum: Properties of Light
Topic: Electron energy levels
Replies: 2
Views: 43

Re: Electron energy levels

That is the case because the amount of energy released is discrete, not continuous. That means that only specific levels of energy can be emitted and no values in between. These specific values were represented by n=1, n=2, n=3, etc on the diagram in lecture.
by Maya Serota 3G
Sun Oct 13, 2019 8:25 pm
Forum: DeBroglie Equation
Topic: Constructive vs. Destructive Interference
Replies: 5
Views: 55

Re: Constructive vs. Destructive Interference

With constructive interference, is the resulting amplitude just the lengths of the individual waves added together? Or can it not be measured that way?
by Maya Serota 3G
Sun Oct 13, 2019 7:52 pm
Forum: Properties of Light
Topic: De Broglie's Equation
Replies: 4
Views: 40

Re: De Broglie's Equation

Also if it is helpful, Dr. Lavelle said in lecture that if your answer is smaller than x 10^-15 you can conclude the object does not exhibit wavelike properties.
by Maya Serota 3G
Sun Oct 13, 2019 7:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 Grading
Replies: 12
Views: 447

Re: Test 1 Grading

Does anyone know when we are expected to get our test 1 scores back? Is it usually the following week in section?
by Maya Serota 3G
Sun Oct 13, 2019 7:09 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 8
Views: 119

Re: E=hv

I understand how and when to use Planck's constant, but why do we use it? How was that specific number derived and what does it represent?
by Maya Serota 3G
Mon Oct 07, 2019 8:47 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: sig figs
Replies: 20
Views: 276

Re: sig figs

Will we be marked down on an exam for using the incorrect amount of sig figs in our answer?
by Maya Serota 3G
Mon Oct 07, 2019 8:45 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 3854

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Are we going to be expected to know how to write the formula for something like "magnesium sulfate heptahydrate," for example, for the test in our discussions? Or will we just be given chemical symbols? I would check with your TA to be completely sure, but the information for the test fro...
by Maya Serota 3G
Mon Oct 07, 2019 8:37 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: sig figs
Replies: 20
Views: 276

Re: sig figs

After reading these posts I am confused about whether or not a zero is considered a sig fig if there is a number like 13.0
Since the zero is trailing the decimal point would it or would it not be a sig fig when doing arithmetic calculations?
by Maya Serota 3G
Mon Oct 07, 2019 8:32 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 3368

Re: Theoretical vs. Actual Yield

I understand the theoretical yield will always be greater than the actual yield due to substances sticking the the side of the beaker, etc, but are there ways to minimize or calculate this difference? And is it possible to have a theoretical yield that is exactly equal to the actual yield?
by Maya Serota 3G
Mon Oct 07, 2019 8:26 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 175
Views: 13403

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you so much for sharing. I am also thinking about Medical school -- as someone who has already gone through it, do you recommend doing anything specific as an undergraduate to make a Medical School application especially stand out? I know it is extremely competitive. Thank you again for your t...

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