Search found 73 matches

by Katherine Brenner 3H
Fri Dec 06, 2019 7:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 3
Views: 90

Formal Charge

When you calculate a formal charge and get 1- will that be a formal charge of +1 or -1 because it is an electcron?
by Katherine Brenner 3H
Fri Dec 06, 2019 7:13 pm
Forum: Bond Lengths & Energies
Topic: Pi and Sigma Bonds and their affect on energy
Replies: 3
Views: 49

Re: Pi and Sigma Bonds and their affect on energy

Thanks- I was also confused on this topic.
by Katherine Brenner 3H
Fri Dec 06, 2019 7:13 pm
Forum: Air Pollution & Acid Rain
Topic: final?
Replies: 5
Views: 111

Re: final?

What lecture did we go over this for fall 2019 quarter?
by Katherine Brenner 3H
Fri Dec 06, 2019 7:12 pm
Forum: Conjugate Acids & Bases
Topic: how to figure out?
Replies: 12
Views: 126

Re: how to figure out?

When you add a H+ to a base then it becomes a conjugate acid and vice versa.
by Katherine Brenner 3H
Fri Dec 06, 2019 7:11 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 10
Views: 134

Re: Dipole Moment

Does Dipole Moments indicate polarity also?
by Katherine Brenner 3H
Fri Dec 06, 2019 7:11 pm
Forum: Naming
Topic: Naming Cont
Replies: 3
Views: 31

Naming Cont

How do we know which compound goes first and last when naming?
by Katherine Brenner 3H
Mon Nov 25, 2019 7:53 pm
Forum: Bond Lengths & Energies
Topic: Boiling point
Replies: 11
Views: 172

Re: Boiling point

Molar mass and boiling point are positivley correlated.
by Katherine Brenner 3H
Mon Nov 25, 2019 7:52 pm
Forum: Ionic & Covalent Bonds
Topic: Intra vs Inter molecular forces
Replies: 7
Views: 86

Intra vs Inter molecular forces

Hello

Can someone explain the difference between intra and intermolecular forces and what forces would go under each one?
Thanks
by Katherine Brenner 3H
Mon Nov 25, 2019 7:51 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 10
Views: 134

Re: Dipole Moment

Can an individual molecule be dipole- dipole. Or would we just say that this is a dipole moment within 1 molecule?
by Katherine Brenner 3H
Mon Nov 25, 2019 7:37 pm
Forum: *Crystal Field Theory
Topic: Crystal Field Theory
Replies: 5
Views: 753

Re: Crystal Field Theory

I dont remember ever hearing about this so I dont think we need to know it for the final.
by Katherine Brenner 3H
Mon Nov 25, 2019 7:35 pm
Forum: Naming
Topic: Naming for Final
Replies: 3
Views: 40

Naming for Final

What will we need to know for the final for this outline. I dont think we covered it that much in class?
by Katherine Brenner 3H
Fri Nov 22, 2019 4:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Notation used in VSEPR
Replies: 8
Views: 59

Re: Notation used in VSEPR

Rebekah Alfred 1L wrote:
Katherine Brenner 3H wrote:Can someone explain how we get that formula?

For example, NH3 will have a VSEPR formula of AX3E because it has three bonded atoms and one lone pair. CH3Cl will have a VSEPR formula of AX4 because it has four bonded atoms and no lone pairs.

Thanks!
by Katherine Brenner 3H
Fri Nov 22, 2019 4:08 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Bond Length
Replies: 3
Views: 110

Dissociation Bond Length

Will we ever be asked to calculate the dissociated bond length(it is inside textbook but I dont remember it from class)?
by Katherine Brenner 3H
Fri Nov 22, 2019 4:08 pm
Forum: Naming
Topic: Naming
Replies: 6
Views: 68

Re: Naming

Anyone have a tip for how to memorize all of these compounds!
by Katherine Brenner 3H
Fri Nov 22, 2019 4:07 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 14
Views: 281

Re: Midterm

Will we ever have to calculate the full shrodinger equation for a test?
by Katherine Brenner 3H
Fri Nov 22, 2019 4:06 pm
Forum: *Particle in a Box
Topic: TEST 2
Replies: 13
Views: 269

Re: TEST 2

Do we need to know anything about this equation(particle in a box) for the final? I dont remeber covering this topic in class nor was it on the midterm.
by Katherine Brenner 3H
Fri Nov 22, 2019 4:05 pm
Forum: Hybridization
Topic: hybridizing d orbitals
Replies: 7
Views: 48

Re: hybridizing d orbitals

How do we know when something has a 2 in front of it? IE 2dsp^2
by Katherine Brenner 3H
Fri Nov 22, 2019 4:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity and melting and boiling points
Replies: 3
Views: 23

Polarity and melting and boiling points

Could someone explain the relationship between polarity and melting and boiling points?

Thanks
by Katherine Brenner 3H
Fri Nov 15, 2019 7:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: varying VSEPRs
Replies: 7
Views: 62

Re: varying VSEPRs

The shape will not vary because we use the most stable molecule.
by Katherine Brenner 3H
Fri Nov 15, 2019 7:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Notation used in VSEPR
Replies: 8
Views: 59

Re: Notation used in VSEPR

Can someone explain how we get that formula?
by Katherine Brenner 3H
Fri Nov 15, 2019 7:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR SHAPES
Replies: 1
Views: 33

VSEPR SHAPES

Could some please write out the different kinds of shapes in the VSEPR and how many bonds and lone pairs that accompany it.
by Katherine Brenner 3H
Fri Nov 15, 2019 7:54 pm
Forum: Dipole Moments
Topic: Hydrogen bonds
Replies: 17
Views: 128

Re: Hydrogen bonds

Hydrogen bonds are when a hydrogen bonds with a Nitrogen, Oxygen, or Fluorine.
by Katherine Brenner 3H
Fri Nov 15, 2019 7:53 pm
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 8
Views: 114

Re: Octet Exception

There is a couple exceptions including some with an expanded octet like Phosphorus and Sulfur. Also other elements have a smaller octect like Hydrogen.
by Katherine Brenner 3H
Fri Nov 15, 2019 7:52 pm
Forum: Dipole Moments
Topic: Do lone pairs repel more?
Replies: 5
Views: 49

Re: Do lone pairs repel more?

Yes lone pairs do repel more :)
by Katherine Brenner 3H
Fri Nov 15, 2019 7:51 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 93

Re: Formal Charge

It is important to know that you will only be calculating the formal charge of one element at a time. I made this mistake for a while and it confused me :)
by Katherine Brenner 3H
Thu Nov 07, 2019 8:32 am
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 165

Re: Trend of Electronegativity

I think of the trend going in a diagonal arrow up to the upper right side. Toward Flourine.
by Katherine Brenner 3H
Thu Nov 07, 2019 8:30 am
Forum: Hybridization
Topic: Pi bonds
Replies: 8
Views: 346

Re: Pi bonds

When you have a double bond, you have 2 pi bonds and 1 sigma bond. When you find the hybridization level, you only count the the number of sigma bonds or hybrid bonds.
by Katherine Brenner 3H
Tue Nov 05, 2019 10:30 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm
Replies: 6
Views: 125

Re: Midterm

I think that we will be asked about certain concepts regarding the midterm because the ones he showed in class from last years midterm had a lot of conceptual questions as well as calculations.
by Katherine Brenner 3H
Tue Nov 05, 2019 10:29 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 23
Views: 1407

Re: De Broglie Wavelength

I believe that everything larger than 10^-12 is a detectable way.
by Katherine Brenner 3H
Tue Nov 05, 2019 10:27 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 2561

Re: Rydberg equation [ENDORSED]

I would just watch the video module on our class website for this. It is about 1 hr long but super helpful in understanding how to do the calculations and understanding of the concept as well.
by Katherine Brenner 3H
Tue Nov 05, 2019 10:26 pm
Forum: Resonance Structures
Topic: Formal charge and resonance
Replies: 5
Views: 67

Re: Formal charge and resonance

I believe that resonance structures normally have the same formal charges.
by Katherine Brenner 3H
Tue Nov 05, 2019 10:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Covalent Character
Replies: 5
Views: 58

Re: Polarizability and Covalent Character

I believe that polarizability refers to the ability to be able to easily loose or gain electrons. Is this correct?
by Katherine Brenner 3H
Tue Nov 05, 2019 10:23 pm
Forum: Dipole Moments
Topic: Dipole, midterm?
Replies: 7
Views: 103

Re: Dipole, midterm?

Can someone breifly explain what we will be expected to know about dipoles on our midterm?
by Katherine Brenner 3H
Tue Nov 05, 2019 10:23 pm
Forum: Octet Exceptions
Topic: Easy way to remember octet exceptions
Replies: 4
Views: 49

Easy way to remember octet exceptions

Hello

Is there any easy way to remember the octet exceptions?
by Katherine Brenner 3H
Fri Nov 01, 2019 5:20 pm
Forum: Properties of Electrons
Topic: Speed of electromagnetic radiation
Replies: 2
Views: 64

Speed of electromagnetic radiation

Is the speed of electromagnetic radiation always constant?- even when frequency decreases or wavelength decreases?
by Katherine Brenner 3H
Fri Nov 01, 2019 3:30 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons?
Replies: 15
Views: 129

Re: Valence Electrons?

Can someone describe the difference for the number of valence electrons in different metals/nonmetals and in the akalines?
by Katherine Brenner 3H
Fri Nov 01, 2019 3:28 pm
Forum: Administrative Questions and Class Announcements
Topic: 10/28 Updates due to Fire [ENDORSED]
Replies: 14
Views: 939

Re: 10/28 Updates due to Fire [ENDORSED]

Does anyone know when the midterm review sessions are for next week? ( week of midterm).
by Katherine Brenner 3H
Fri Nov 01, 2019 3:28 pm
Forum: Properties of Light
Topic: Midterm Exam
Replies: 21
Views: 229

Re: Midterm Exam

Is anyone in a study group that I could join for the midterm exam? It could be helpful to have peer input when trying to study for the midterm.
by Katherine Brenner 3H
Fri Nov 01, 2019 3:26 pm
Forum: Trends in The Periodic Table
Topic: Studying techniques
Replies: 3
Views: 39

Studying techniques

Does anyone have any easy to remember studying techniques for remembering trends in the periodic table?
by Katherine Brenner 3H
Fri Nov 01, 2019 3:25 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 76

Re: Lone Pairs

Will you have lone pairs during an ionic bond?
by Katherine Brenner 3H
Fri Nov 01, 2019 3:23 pm
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 5
Views: 54

Octet Exception

What elements are an exception to the octet rule?
by Katherine Brenner 3H
Fri Oct 25, 2019 11:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 4
Views: 39

Re: Formal Charge

Does anyone know where we could find an example of this in the textbook (please post a page number if possible)?

Thanks
by Katherine Brenner 3H
Fri Oct 25, 2019 11:11 pm
Forum: Lewis Structures
Topic: Denoting charge on ions
Replies: 2
Views: 24

Re: Denoting charge on ions

I believe that this is more for formatting reasons. I think that this helps separate the element from the electrons count. Also, keep in mind that noble gases are also bracketed.
by Katherine Brenner 3H
Fri Oct 25, 2019 11:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Calculating Subshells
Replies: 3
Views: 46

Re: Calculating Subshells

Would someone mind breaking down the steps to calculating subshells because i am seeming to have difficultly with it?

Thanks
by Katherine Brenner 3H
Fri Oct 25, 2019 11:08 pm
Forum: Electronegativity
Topic: Nonmetals?
Replies: 6
Views: 275

Re: Nonmetals?

The answer to both of your questions are yes- nonmetals are closer to acheiving and octet. This is because of this position on the periodic table.
by Katherine Brenner 3H
Fri Oct 25, 2019 11:06 pm
Forum: Ionic & Covalent Bonds
Topic: Meaning of Brackets
Replies: 7
Views: 64

Re: Meaning of Brackets

Brackets indicates something is a noble gas. I was originally confused on this as well so dont worry!
by Katherine Brenner 3H
Thu Oct 17, 2019 8:43 am
Forum: Einstein Equation
Topic: Equations and their purpose
Replies: 3
Views: 56

Re: Equations and their purpose

Same Haley!

Thank you so much to everyone who responded because now it makes sense.
by Katherine Brenner 3H
Tue Oct 15, 2019 8:56 am
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra!!
Replies: 2
Views: 34

Re: Atomic Spectra!!

How do we tell what level an electron typically ends up in? (IE n=1, n=3)
by Katherine Brenner 3H
Tue Oct 15, 2019 8:55 am
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 16
Views: 233

Re: Atomic Radius

Could someone explain when an electron will move up to an excited energy state?
by Katherine Brenner 3H
Tue Oct 15, 2019 8:52 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 30
Views: 1109

Re: Wavelength Plausibility

Does that mean that the larger an electrons wavelength is, the more wave-like properties it possesses?
by Katherine Brenner 3H
Tue Oct 15, 2019 8:49 am
Forum: Photoelectric Effect
Topic: Threshold and activation energy
Replies: 3
Views: 49

Re: Threshold and activation energy

So a molecule uses activation energy to start making collisions but runs out of energy and thus uses threshold energy?
by Katherine Brenner 3H
Tue Oct 15, 2019 8:47 am
Forum: Properties of Light
Topic: Quantum Unit length
Replies: 2
Views: 22

Re: Quantum Unit length

I believe the Quantum world is a long unit- that what Proff said in lecture on the first day. I think this chapter will last until next week.
by Katherine Brenner 3H
Tue Oct 15, 2019 8:43 am
Forum: Photoelectric Effect
Topic: Question about Energy Threshold
Replies: 7
Views: 75

Re: Question about Energy Threshold

If there is not enough energy to bounce the electron off the metal surface, then the photoelectric effect will not happen.
by Katherine Brenner 3H
Tue Oct 15, 2019 8:40 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Indeterminancy In Class
Replies: 7
Views: 57

Re: Indeterminancy In Class

Hello

He just went over this last Monday. We just need to understand the equation and have a general idea of the characteristics and ideas that led to him creating the equation.
by Katherine Brenner 3H
Tue Oct 15, 2019 8:37 am
Forum: Properties of Light
Topic: Homework
Replies: 11
Views: 70

Re: Homework

As long as it is from the right topic then its fine. IE right now we are in "Quantum World" topic. My TA said it would be good to have a mix of different problems from different sections assigned but I think that is just prefer that way the TAs know you are doing all of the homework. Howev...
by Katherine Brenner 3H
Tue Oct 08, 2019 8:50 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding
Replies: 12
Views: 243

Re: Rounding

The number of significant figs in the question is the amount we are supposed to be using in our answer. For example if the question has 1.34 grams co2 then our answer should be 3 sig figs such as 8.23 x 10^28
by Katherine Brenner 3H
Tue Oct 08, 2019 8:47 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 1997

Re: Ionic vs Covalent

It should be noted that water can weaken an ionic bond so in that case a covalent bond may be stronger.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:47 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 1997

Re: Ionic vs Covalent

It should be noted that water can weaken an ionic bond so in that case a covalent bond may be stronger.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:43 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 2317

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

Hi Nate

Dimensional analysis is the way we solve problems and use the multiplication techniques such as 21 grams 1mole/107 grams and the units cancel out.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:40 am
Forum: Properties of Light
Topic: Planck's Law
Replies: 4
Views: 67

Re: Planck's Law

Hello

Can someone please explain to me what Pancks law means in terms of quanta and photons. Im confused.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:39 am
Forum: Einstein Equation
Topic: Wavelengths
Replies: 5
Views: 110

Re: Wavelengths

Hello

This was the same problem Dr. Lavelle worked out in class. wavelength= hc/E is the equation he used in class by rearranging E=hv
by Katherine Brenner 3H
Tue Oct 08, 2019 8:33 am
Forum: Properties of Light
Topic: Light intensity
Replies: 10
Views: 96

Re: Light intensity

I am also confused on the correlation between light intensity and frequency. Would someone mind explaining the difference between the wave vs light model.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:30 am
Forum: Properties of Light
Topic: Posts Per Week
Replies: 6
Views: 87

Re: Posts Per Week

Im pretty sure that the grades will be posted on ccle the following week.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:29 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 1997

Re: Ionic vs Covalent

Ionic bonds are stronger than covalent bonds because covalent bonds share an electron.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:25 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 3506

Re: Test 1 [ENDORSED]

I do not think that we need a bluebook for the exam.
by Katherine Brenner 3H
Tue Oct 08, 2019 8:23 am
Forum: SI Units, Unit Conversions
Topic: Test 1
Replies: 9
Views: 160

Re: Test 1

I think because it was assigned as HW, we should definitely know how to do it. It says on the syllabus that 1 out of 8 homework problems will be on the exam so it is important to know Molarity.
by Katherine Brenner 3H
Tue Oct 01, 2019 6:22 pm
Forum: Empirical & Molecular Formulas
Topic: Compound Formulas
Replies: 2
Views: 60

Re: Compound Formulas

I think that we will need to know the nomenclature compounds. I would not worry about this too much as we will probably use this alot in this course so we will probably know the most common ones without memorizing!
by Katherine Brenner 3H
Tue Oct 01, 2019 6:19 pm
Forum: Limiting Reactant Calculations
Topic: Aqueous Solutions
Replies: 3
Views: 28

Re: Aqueous Solutions

This is a great question. I think for the sake of this class we should probably be careful to always assume that water will be the excess reactant, although in the real scientific world that would make a lot of sense.
by Katherine Brenner 3H
Tue Oct 01, 2019 6:17 pm
Forum: SI Units, Unit Conversions
Topic: Calculator Question
Replies: 13
Views: 220

Re: Calculator Question

Just a scientific calc should be good! I dont think we will be needing anything that has to do with graphing for the exam.
by Katherine Brenner 3H
Tue Oct 01, 2019 6:14 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution when it comes to percentage
Replies: 3
Views: 65

Re: Dilution when it comes to percentage

Im pretty sure that you could just assume 100 grams like we do when we calculate the empirical and molecular formulas.
by Katherine Brenner 3H
Tue Oct 01, 2019 6:10 pm
Forum: Significant Figures
Topic: Sig figs confusion
Replies: 8
Views: 147

Re: Sig figs confusion

Hello

I am having the same problem- Im never really sure how many sig figs to use in each question. I normally just use the amount that they give inside the question (if they give a specific number).
by Katherine Brenner 3H
Tue Oct 01, 2019 6:08 pm
Forum: Balancing Chemical Reactions
Topic: Tips for Balancing Chemical Equations [ENDORSED]
Replies: 14
Views: 222

Re: Tips for Balancing Chemical Reactions [ENDORSED]

I always balance the element that comes up the least first. I have noticed that writing the amount of each element below it while I am balencing can be very helpful.
by Katherine Brenner 3H
Tue Oct 01, 2019 6:06 pm
Forum: SI Units, Unit Conversions
Topic: Naming Compounds?
Replies: 10
Views: 248

Re: Naming Compounds?

Section D is really helpful for that in the textbook. I do think that we will need to know what some of the compounds are like for nitrite. I think that as the course goes on you will become more familiar with certain compounds so there will not need to be much memorizing because we will be using th...

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