Search found 63 matches

by PriscillaLi_3G
Sat Dec 07, 2019 4:11 pm
Forum: Significant Figures
Topic: Logarithm sigfigs with O
Replies: 2
Views: 54

Logarithm sigfigs with O

If there is a 0 after the decimal point of a logarithmic calculation, does that count?

for example if pH=0.02, does that count as one sigfig or two?
by PriscillaLi_3G
Sat Dec 07, 2019 11:29 am
Forum: Properties of Electrons
Topic: Wave-particle duality
Replies: 1
Views: 42

Wave-particle duality

Do electrons also have wave-particle duality properties?
by PriscillaLi_3G
Sat Dec 07, 2019 2:53 am
Forum: Bronsted Acids & Bases
Topic: HW 6.21
Replies: 2
Views: 58

HW 6.21

I am confused for this question The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many pro- tons can this base accept?' For part a, why can't the lone pairs on oxygen accept ...
by PriscillaLi_3G
Sat Dec 07, 2019 2:27 am
Forum: Lewis Acids & Bases
Topic: HW 6.5
Replies: 1
Views: 31

HW 6.5

How can you tell which is the Lewis acid and Lewis base between H2O2 and H2SO5?
by PriscillaLi_3G
Sat Dec 07, 2019 1:26 am
Forum: Bronsted Acids & Bases
Topic: Stability and electronegativity
Replies: 1
Views: 21

Stability and electronegativity

Why does a higher electronegativity cause the charge to be distributed more evenly? I thought the more electronegative, the more an electron would be pulled to one side?
by PriscillaLi_3G
Sat Dec 07, 2019 12:49 am
Forum: Bronsted Acids & Bases
Topic: 6C.17
Replies: 1
Views: 27

6C.17

I'm confused on how we're supposed to go about this problem:

Which is the stronger base, the hypobromite ion, BrO2, or morphine, C17H19O3N? Justify your answer.

Thanks!
by PriscillaLi_3G
Thu Dec 05, 2019 10:37 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelate
Replies: 2
Views: 37

chelate

can a chelate be made up of bidentate ligands or is it only polydentate ligands?
by PriscillaLi_3G
Thu Dec 05, 2019 10:28 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Hemoglobin
Replies: 1
Views: 31

Hemoglobin

Why is hemoglobin a polydentate?
by PriscillaLi_3G
Thu Dec 05, 2019 12:24 am
Forum: Bronsted Acids & Bases
Topic: Strong Bases
Replies: 3
Views: 30

Strong Bases

What are the strong bases that we should know?
by PriscillaLi_3G
Wed Dec 04, 2019 8:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate Potential
Replies: 2
Views: 32

Re: Polydentate Potential

How do you know if a ligand can be polydentate? I know that the metal can bond to the lone pairs but for example in Oxalate (C2O4 2-), it can be bidentate, but why is it not tetradentate? If you draw the lewis structure and do the formal charges, you will notice that there are only 2 atoms in which...
by PriscillaLi_3G
Wed Dec 04, 2019 8:16 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 5
Views: 62

Chelate

What do we have to know about chelates?
by PriscillaLi_3G
Wed Dec 04, 2019 4:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape
Replies: 2
Views: 25

Shape

Which shapes do we need to know for the class?
by PriscillaLi_3G
Mon Dec 02, 2019 4:29 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic
Replies: 3
Views: 56

Re: Isoelectronic

There isn't necessarily a trend. However you can apply the cation/anion trends to isoelectronic atoms.
by PriscillaLi_3G
Mon Dec 02, 2019 4:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 275
Views: 108633

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle,

Thank you for putting in so much effort in providing us resources to learn chemistry! Also, I appreciate the memes:)

Priscilla
by PriscillaLi_3G
Mon Dec 02, 2019 4:25 pm
Forum: Electronegativity
Topic: Atom size
Replies: 16
Views: 227

Re: Atom size

Electronegativity does not affect the size of an atom.
by PriscillaLi_3G
Mon Dec 02, 2019 4:23 pm
Forum: Bond Lengths & Energies
Topic: Boiling point
Replies: 11
Views: 106

Re: Boiling point

Higher molar masses mean that there are more electrons, which means more e- e- repulsion and shielding. This makes the distortion easier, which would increase the dipole moment, thus requiring a higher boiling point to break the bonds.
by PriscillaLi_3G
Mon Dec 02, 2019 4:20 pm
Forum: Dipole Moments
Topic: Hydrogen Bonding
Replies: 17
Views: 245

Re: Hydrogen Bonding

PranaviKolla3G wrote:Can hydrogen bonding only occur if an H atom is bonded with a N, O, or F atom?


Yes!
by PriscillaLi_3G
Wed Nov 27, 2019 1:01 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids
Replies: 13
Views: 140

Re: Acids

Jessica Tran_3K wrote:I think knowing the 7 common acids would be helpful! They are:
hydrochloric acid. HCL.
hydrobromic acid. HBr.
Hydroiodic acid. HI.
Nitric acid. HNO3.
Perchloric acid. HClO4.
Sulfuric acid. H2SO4.
Chloric acid. HClO3


These are the 7 main ones you should definitely know!
by PriscillaLi_3G
Wed Nov 27, 2019 1:00 pm
Forum: Polyprotic Acids & Bases
Topic: Defintion
Replies: 11
Views: 400

Re: Defintion

Ethan Breaux 2F wrote:Is water then polyprotic?



Water is not a polyprotic acid because you would start considering it from H2O and not OH-
by PriscillaLi_3G
Wed Nov 27, 2019 12:57 pm
Forum: Amphoteric Compounds
Topic: Amphoteric characteristics
Replies: 3
Views: 32

Amphoteric characteristics

What differentiates amphoteric compounds from acids and bases?
by PriscillaLi_3G
Wed Nov 27, 2019 12:56 pm
Forum: Bronsted Acids & Bases
Topic: Acids vs Bases
Replies: 5
Views: 41

Acids vs Bases

What differentiates an acid from a base?
by PriscillaLi_3G
Wed Nov 27, 2019 12:53 pm
Forum: Amphoteric Compounds
Topic: Amphoteric
Replies: 8
Views: 69

Re: Amphoteric

You can tell by the location of the atoms on the periodic table. Be, Al, Ga, Sn, Pb, and Sb form amphoteric compounds. Anything to the left of them on the period table forms bases, and anything to the right forms acids. Was this the diagonal line on the periodic table he was trying to explain in le...
by PriscillaLi_3G
Mon Nov 18, 2019 11:47 am
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 470

Re: Test 2 Topics

It is not cumulative.
by PriscillaLi_3G
Mon Nov 18, 2019 11:46 am
Forum: Resonance Structures
Topic: Bond length
Replies: 5
Views: 69

Bond length

So are bond lengths always the same for all molecules due to resonance?
by PriscillaLi_3G
Mon Nov 18, 2019 11:46 am
Forum: Octet Exceptions
Topic: Antioxidants
Replies: 9
Views: 119

Re: Antioxidants

What is the significance of antioxidants?
by PriscillaLi_3G
Mon Nov 18, 2019 11:45 am
Forum: Lewis Structures
Topic: Oxygen
Replies: 9
Views: 114

Re: Oxygen

Oxygen can have either double or triple bonds depending on the molecule.
by PriscillaLi_3G
Mon Nov 18, 2019 11:43 am
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi
Replies: 11
Views: 83

Re: Sigma vs Pi

Do we have to know Sigma and Pi bonds for the test?
by PriscillaLi_3G
Mon Nov 11, 2019 5:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum numbers
Replies: 13
Views: 161

Re: Magnetic Quantum numbers

It goes from -l to l, with all the numbers in between.
by PriscillaLi_3G
Mon Nov 11, 2019 5:28 pm
Forum: DeBroglie Equation
Topic: Velocity
Replies: 13
Views: 192

Re: Velocity

It would be considered unreasonable.
by PriscillaLi_3G
Mon Nov 11, 2019 5:27 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 6
Views: 83

Re: Ionization energy

Nitrogen has a half-full shell, which is more stable, so it would be harder to remove an electron, thus increasing the ionization energy. In addition, the 4th electron in the oxygen atom has an electron-electron repulsion with the other electron in the orbital, thus making it easier to remove the el...
by PriscillaLi_3G
Mon Nov 11, 2019 5:10 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 10
Views: 73

Re: Expanded Octet

Some elements (such as period 3) have empty d orbitals that can accommodate more electrons, and so we can overlook the octet rule for those atoms.
by PriscillaLi_3G
Mon Nov 11, 2019 5:08 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 2643

Re: E=hv

E represents the energy of one photon
by PriscillaLi_3G
Mon Nov 11, 2019 5:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 3
Views: 31

Re: Formal Charge Equation

just count the number electrons and dashes and subtract it from the atom's number of valence electrons
by PriscillaLi_3G
Mon Nov 11, 2019 5:07 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Determine Formal Charge
Replies: 3
Views: 27

Re: Determine Formal Charge

You should give the negative formal charge to the most electronegative element because they want the electron to complete their shells and become more stable.
by PriscillaLi_3G
Mon Nov 11, 2019 5:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 107

Re: Formal charge

Second best option is to get the formal charges of each atom as close to zero as possible. Give the negative formal charges to the atoms with higher electronegativity.
by PriscillaLi_3G
Tue Nov 05, 2019 9:15 pm
Forum: Einstein Equation
Topic: e=hv used for particles?
Replies: 3
Views: 77

e=hv used for particles?

Can E=hv be used only for electromagnetic radiation? Or can it also be applied to particles?
by PriscillaLi_3G
Tue Nov 05, 2019 8:47 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman
Replies: 1
Views: 44

Lyman

In the Lyman series, is the final n =1 or is initial n=1?
by PriscillaLi_3G
Sat Nov 02, 2019 5:08 pm
Forum: Electronegativity
Topic: Definition
Replies: 2
Views: 28

Definition

What exactly does electronegativity mean?
by PriscillaLi_3G
Sat Nov 02, 2019 5:07 pm
Forum: Bond Lengths & Energies
Topic: Single bond vs double bond
Replies: 14
Views: 144

Re: Single bond vs double bond

Angstrom is a unit of length, so the numbers represent the bond length between the two atoms. I believe the reason Professor Lavelle cared to specify the lengths of the bonds is to show that single bonds are longer than double bonds.
by PriscillaLi_3G
Sat Nov 02, 2019 5:04 pm
Forum: Dipole Moments
Topic: Definition
Replies: 5
Views: 67

Definition

What exactly is a dipole moment?
by PriscillaLi_3G
Sat Nov 02, 2019 5:00 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Minimize formal charge of whole molecule?
Replies: 7
Views: 48

Minimize formal charge of whole molecule?

When drawing lewis structures, is the goal to have the formal charges of each atom add up as closely as possible to zero? Or for the formal charge of each individual atom to be as close to zero as possible?
by PriscillaLi_3G
Sat Nov 02, 2019 4:53 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 3
Views: 44

Drawing Resonance Structures

On the test, are we supposed to draw all the resonance structures even if it is not stated in the question?
by PriscillaLi_3G
Wed Oct 23, 2019 11:22 am
Forum: DeBroglie Equation
Topic: Velocity
Replies: 13
Views: 192

Re: Velocity

You should assume that a velocity > 3x10^8 is unreasonable
by PriscillaLi_3G
Wed Oct 23, 2019 11:21 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Atomic Radius
Replies: 18
Views: 137

Re: Atomic Radius

A visual of the atomic radius trend in the periodic table: https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwiqvKfK_7LlAhXEIjQIHTMEBPIQjRx6BAgBEAQ&url=https%3A%2F%2Fcourses.lumenlearning.com%2Fcheminter%2Fchapter%2Fperiodic-trends-atomic-radius%...
by PriscillaLi_3G
Wed Oct 23, 2019 11:19 am
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 8
Views: 79

Re: Ionization Energy

As you take away an electron, you have the same positive energy power holding onto less electrons, so each electron gets a stronger pull, which makes it harder to take away a second, third, etc. electron
by PriscillaLi_3G
Wed Oct 23, 2019 11:18 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s, p, d, f orbitals
Replies: 15
Views: 126

Re: s, p, d, f orbitals

so at each energy level, are there s- p- d- f- orbitals?
by PriscillaLi_3G
Wed Oct 23, 2019 11:17 am
Forum: *Black Body Radiation
Topic: What is it?
Replies: 6
Views: 117

Re: What is it?

It won't be tested!
by PriscillaLi_3G
Wed Oct 23, 2019 11:15 am
Forum: *Shrodinger Equation
Topic: Wave functions
Replies: 9
Views: 85

Re: Wave functions

So is the wave function related to the quantum numbers n, l, and ml?
by PriscillaLi_3G
Wed Oct 16, 2019 3:35 pm
Forum: Einstein Equation
Topic: Units
Replies: 17
Views: 702

Re: Units

Is it necessary that we put in the units while showing our work?
by PriscillaLi_3G
Wed Oct 16, 2019 3:33 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 2643

Re: E=hv

E represents the energy of the photon.
by PriscillaLi_3G
Wed Oct 16, 2019 3:31 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect
Replies: 5
Views: 63

Re: Photoelectric effect

Different metals will require different levels of energy to break the electron away from the metal atom.
by PriscillaLi_3G
Wed Oct 16, 2019 3:26 pm
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 109

Re: Constant for Speed of Light

Lavelle generally uses 3.0 x 10^8 in class so I believe that is fine.
by PriscillaLi_3G
Wed Oct 16, 2019 3:25 pm
Forum: Photoelectric Effect
Topic: Particle vs. Wave Model
Replies: 5
Views: 45

Particle vs. Wave Model

I was confused about how both the particle and wave models come together to model light. Is it that light is a particle and the flow of the particles (photons) are in a wave?
by PriscillaLi_3G
Fri Oct 11, 2019 11:32 am
Forum: Empirical & Molecular Formulas
Topic: Decimals to Whole Numbers
Replies: 6
Views: 154

Re: Decimals to Whole Numbers

How far away from the whole number can the number be to still be able to round? Like, if I got 1.89, could I round that to 2?
by PriscillaLi_3G
Fri Oct 11, 2019 11:30 am
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 20
Views: 243

Re: Fractions

Don't leave the coefficients as fractions.
by PriscillaLi_3G
Fri Oct 11, 2019 11:29 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy and Precision
Replies: 8
Views: 114

Accuracy and Precision

Why is the accuracy vs. precision concept relevant to the chemistry we are learning right now?
by PriscillaLi_3G
Fri Oct 11, 2019 11:28 am
Forum: Significant Figures
Topic: Answer being a tad bit off
Replies: 8
Views: 211

Re: Answer being a tad bit off

How far off is too far off?
by PriscillaLi_3G
Fri Oct 11, 2019 11:27 am
Forum: Significant Figures
Topic: Sig Figs in % Yield
Replies: 10
Views: 192

Re: Sig Figs in % Yield

When I am solving a problem, do I have to keep in mind the sigfigs throughout all the calculations? Or just keep the right sigfigs for the final answer.
by PriscillaLi_3G
Thu Oct 03, 2019 9:53 pm
Forum: Significant Figures
Topic: No numbers in problem?
Replies: 3
Views: 71

No numbers in problem?

How many sig figs would you put if the original problem had no numbers in it to base your sig figs off of?
by PriscillaLi_3G
Thu Oct 03, 2019 9:50 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 232

Re: Avogadro's Number?

How do you know when to multiply using Avogadro's number and when to divide?
by PriscillaLi_3G
Thu Oct 03, 2019 9:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: Gaseous Mixtures
Replies: 2
Views: 53

Re: Gaseous Mixtures

I take it that the term "gaseous solution" just isn't correct terminology.
by PriscillaLi_3G
Thu Oct 03, 2019 9:41 pm
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 278

Re: Question about Showing Work

I think show your work in case you can get partial credit?
by PriscillaLi_3G
Thu Oct 03, 2019 9:40 pm
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 252

Re: Homework Week 1

Am I supposed to choose the 5 problems so that I do one from each topic?

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