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?
Search found 63 matches
- Sat Dec 07, 2019 4:11 pm
- Forum: Significant Figures
- Topic: Logarithm sigfigs with O
- Replies: 2
- Views: 380
- Sat Dec 07, 2019 11:29 am
- Forum: Properties of Electrons
- Topic: Wave-particle duality
- Replies: 2
- Views: 290
Wave-particle duality
Do electrons also have wave-particle duality properties?
- Sat Dec 07, 2019 2:53 am
- Forum: Bronsted Acids & Bases
- Topic: HW 6.21
- Replies: 3
- Views: 391
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 ...
- Sat Dec 07, 2019 2:27 am
- Forum: Lewis Acids & Bases
- Topic: HW 6.5
- Replies: 1
- Views: 228
HW 6.5
How can you tell which is the Lewis acid and Lewis base between H2O2 and H2SO5?
- Sat Dec 07, 2019 1:26 am
- Forum: Bronsted Acids & Bases
- Topic: Stability and electronegativity
- Replies: 1
- Views: 167
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?
- Sat Dec 07, 2019 12:49 am
- Forum: Bronsted Acids & Bases
- Topic: 6C.17
- Replies: 1
- Views: 165
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!
Which is the stronger base, the hypobromite ion, BrO2, or morphine, C17H19O3N? Justify your answer.
Thanks!
- Thu Dec 05, 2019 10:37 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelate
- Replies: 2
- Views: 225
chelate
can a chelate be made up of bidentate ligands or is it only polydentate ligands?
- Thu Dec 05, 2019 10:28 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hemoglobin
- Replies: 1
- Views: 188
Hemoglobin
Why is hemoglobin a polydentate?
- Thu Dec 05, 2019 12:24 am
- Forum: Bronsted Acids & Bases
- Topic: Strong Bases
- Replies: 3
- Views: 298
Strong Bases
What are the strong bases that we should know?
- Wed Dec 04, 2019 8:22 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate Potential
- Replies: 2
- Views: 237
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...
- Wed Dec 04, 2019 8:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate
- Replies: 5
- Views: 392
Chelate
What do we have to know about chelates?
- Wed Dec 04, 2019 4:18 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Shape
- Replies: 2
- Views: 244
Shape
Which shapes do we need to know for the class?
- Mon Dec 02, 2019 4:29 pm
- Forum: Trends in The Periodic Table
- Topic: Isoelectronic
- Replies: 3
- Views: 404
Re: Isoelectronic
There isn't necessarily a trend. However you can apply the cation/anion trends to isoelectronic atoms.
- Mon Dec 02, 2019 4:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 633224
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
Thank you for putting in so much effort in providing us resources to learn chemistry! Also, I appreciate the memes:)
Priscilla
- Mon Dec 02, 2019 4:25 pm
- Forum: Electronegativity
- Topic: Atom size
- Replies: 22
- Views: 3359
Re: Atom size
Electronegativity does not affect the size of an atom.
- Mon Dec 02, 2019 4:23 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling point
- Replies: 11
- Views: 1229
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.
- Mon Dec 02, 2019 4:20 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonding
- Replies: 20
- Views: 1188
Re: Hydrogen Bonding
PranaviKolla3G wrote:Can hydrogen bonding only occur if an H atom is bonded with a N, O, or F atom?
Yes!
- Wed Nov 27, 2019 1:01 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids
- Replies: 13
- Views: 1613
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!
- Wed Nov 27, 2019 1:00 pm
- Forum: Polyprotic Acids & Bases
- Topic: Defintion
- Replies: 39
- Views: 2681
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-
- Wed Nov 27, 2019 12:57 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric characteristics
- Replies: 3
- Views: 305
Amphoteric characteristics
What differentiates amphoteric compounds from acids and bases?
- Wed Nov 27, 2019 12:56 pm
- Forum: Bronsted Acids & Bases
- Topic: Acids vs Bases
- Replies: 5
- Views: 414
Acids vs Bases
What differentiates an acid from a base?
- Wed Nov 27, 2019 12:53 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric
- Replies: 8
- Views: 410
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...
- Mon Nov 18, 2019 11:47 am
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 2365
Re: Test 2 Topics
It is not cumulative.
- Mon Nov 18, 2019 11:46 am
- Forum: Resonance Structures
- Topic: Bond length
- Replies: 5
- Views: 446
Bond length
So are bond lengths always the same for all molecules due to resonance?
- Mon Nov 18, 2019 11:46 am
- Forum: Octet Exceptions
- Topic: Antioxidants
- Replies: 9
- Views: 732
Re: Antioxidants
What is the significance of antioxidants?
- Mon Nov 18, 2019 11:45 am
- Forum: Lewis Structures
- Topic: Oxygen
- Replies: 9
- Views: 784
Re: Oxygen
Oxygen can have either double or triple bonds depending on the molecule.
- Mon Nov 18, 2019 11:43 am
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs Pi
- Replies: 11
- Views: 754
Re: Sigma vs Pi
Do we have to know Sigma and Pi bonds for the test?
- Mon Nov 11, 2019 5:30 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Magnetic Quantum numbers
- Replies: 13
- Views: 836
Re: Magnetic Quantum numbers
It goes from -l to l, with all the numbers in between.
- Mon Nov 11, 2019 5:28 pm
- Forum: DeBroglie Equation
- Topic: Velocity
- Replies: 13
- Views: 962
Re: Velocity
It would be considered unreasonable.
- Mon Nov 11, 2019 5:27 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy
- Replies: 6
- Views: 410
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...
- Mon Nov 11, 2019 5:10 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 10
- Views: 541
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.
- Mon Nov 11, 2019 5:08 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18580
Re: E=hv [ENDORSED]
E represents the energy of one photon
- Mon Nov 11, 2019 5:08 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Equation
- Replies: 3
- Views: 292
Re: Formal Charge Equation
just count the number electrons and dashes and subtract it from the atom's number of valence electrons
- Mon Nov 11, 2019 5:07 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Determine Formal Charge
- Replies: 3
- Views: 279
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.
- Mon Nov 11, 2019 5:06 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 16
- Views: 955
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.
- Tue Nov 05, 2019 9:15 pm
- Forum: Einstein Equation
- Topic: e=hv used for particles?
- Replies: 10
- Views: 1460
e=hv used for particles?
Can E=hv be used only for electromagnetic radiation? Or can it also be applied to particles?
- Tue Nov 05, 2019 8:47 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Lyman
- Replies: 1
- Views: 179
Lyman
In the Lyman series, is the final n =1 or is initial n=1?
- Sat Nov 02, 2019 5:08 pm
- Forum: Electronegativity
- Topic: Definition
- Replies: 2
- Views: 119
Definition
What exactly does electronegativity mean?
- Sat Nov 02, 2019 5:07 pm
- Forum: Bond Lengths & Energies
- Topic: Single bond vs double bond
- Replies: 14
- Views: 920
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.
- Sat Nov 02, 2019 5:04 pm
- Forum: Dipole Moments
- Topic: Definition
- Replies: 5
- Views: 265
Definition
What exactly is a dipole moment?
- Sat Nov 02, 2019 5:00 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Minimize formal charge of whole molecule?
- Replies: 7
- Views: 361
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?
- Sat Nov 02, 2019 4:53 pm
- Forum: Resonance Structures
- Topic: Drawing Resonance Structures
- Replies: 3
- Views: 299
Drawing Resonance Structures
On the test, are we supposed to draw all the resonance structures even if it is not stated in the question?
- Wed Oct 23, 2019 11:22 am
- Forum: DeBroglie Equation
- Topic: Velocity
- Replies: 13
- Views: 962
Re: Velocity
You should assume that a velocity > 3x10^8 is unreasonable
- Wed Oct 23, 2019 11:21 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Atomic Radius
- Replies: 18
- Views: 681
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%...
- Wed Oct 23, 2019 11:19 am
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 8
- Views: 342
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
- 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: 797
Re: s, p, d, f orbitals
so at each energy level, are there s- p- d- f- orbitals?
- Wed Oct 23, 2019 11:17 am
- Forum: *Black Body Radiation
- Topic: What is it?
- Replies: 6
- Views: 644
Re: What is it?
It won't be tested!
- Wed Oct 23, 2019 11:15 am
- Forum: *Shrodinger Equation
- Topic: Wave functions
- Replies: 9
- Views: 381
Re: Wave functions
So is the wave function related to the quantum numbers n, l, and ml?
- Wed Oct 16, 2019 3:35 pm
- Forum: Einstein Equation
- Topic: Units
- Replies: 17
- Views: 1815
Re: Units
Is it necessary that we put in the units while showing our work?
- Wed Oct 16, 2019 3:33 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18580
Re: E=hv [ENDORSED]
E represents the energy of the photon.
- Wed Oct 16, 2019 3:31 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect
- Replies: 5
- Views: 221
Re: Photoelectric effect
Different metals will require different levels of energy to break the electron away from the metal atom.
- Wed Oct 16, 2019 3:26 pm
- Forum: Properties of Light
- Topic: Constant for Speed of Light
- Replies: 14
- Views: 626
Re: Constant for Speed of Light
Lavelle generally uses 3.0 x 10^8 in class so I believe that is fine.
- Wed Oct 16, 2019 3:25 pm
- Forum: Photoelectric Effect
- Topic: Particle vs. Wave Model
- Replies: 5
- Views: 292
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?
- Fri Oct 11, 2019 11:32 am
- Forum: Empirical & Molecular Formulas
- Topic: Decimals to Whole Numbers
- Replies: 6
- Views: 571
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?
- Fri Oct 11, 2019 11:30 am
- Forum: Balancing Chemical Reactions
- Topic: Fractions
- Replies: 34
- Views: 1497
Re: Fractions
Don't leave the coefficients as fractions.
- Fri Oct 11, 2019 11:29 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy and Precision
- Replies: 8
- Views: 451
Accuracy and Precision
Why is the accuracy vs. precision concept relevant to the chemistry we are learning right now?
- Fri Oct 11, 2019 11:28 am
- Forum: Significant Figures
- Topic: Answer being a tad bit off
- Replies: 8
- Views: 570
Re: Answer being a tad bit off
How far off is too far off?
- Fri Oct 11, 2019 11:27 am
- Forum: Significant Figures
- Topic: Sig Figs in % Yield
- Replies: 10
- Views: 6567
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.
- Thu Oct 03, 2019 9:53 pm
- Forum: Significant Figures
- Topic: No numbers in problem?
- Replies: 3
- Views: 215
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?
- Thu Oct 03, 2019 9:50 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number?
- Replies: 16
- Views: 969
Re: Avogadro's Number?
How do you know when to multiply using Avogadro's number and when to divide?
- Thu Oct 03, 2019 9:45 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Gaseous Mixtures
- Replies: 2
- Views: 223
Re: Gaseous Mixtures
I take it that the term "gaseous solution" just isn't correct terminology.
- Thu Oct 03, 2019 9:41 pm
- Forum: SI Units, Unit Conversions
- Topic: Question about Showing Work
- Replies: 22
- Views: 1101
Re: Question about Showing Work
I think show your work in case you can get partial credit?
- Thu Oct 03, 2019 9:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Homework Week 1
- Replies: 18
- Views: 833
Re: Homework Week 1
Am I supposed to choose the 5 problems so that I do one from each topic?