Search found 55 matches
- Sun Dec 08, 2019 9:47 pm
- Forum: Air Pollution & Acid Rain
- Topic: Options to reduce acid rain
- Replies: 8
- Views: 626
Re: Options to reduce acid rain
use slacked lime or quick lime
- Sun Dec 08, 2019 9:46 pm
- Forum: General Science Questions
- Topic: 50 post grade
- Replies: 25
- Views: 1886
Re: 50 post grade
not sure, but I know this post is going to count as one!
- Sun Dec 08, 2019 9:37 pm
- Forum: Student Social/Study Group
- Topic: Practice Final
- Replies: 17
- Views: 1416
Re: Practice Final
Unfortunately not, but the homework problems would help
- Sun Dec 08, 2019 9:33 pm
- Forum: Student Social/Study Group
- Topic: heme complex
- Replies: 5
- Views: 649
heme complex
how many ligands does a heme complex have
- Sun Dec 08, 2019 9:33 pm
- Forum: Student Social/Study Group
- Topic: stoichiometric point and titrations
- Replies: 2
- Views: 314
stoichiometric point and titrations
I didn't see titrations on the syllabus, but it was on the final. If I remember correctly, we were told that titrations wouldn't be emphasized. How were we supposed to know it would be on the final??
- Sun Dec 08, 2019 9:25 pm
- Forum: Student Social/Study Group
- Topic: thoughts on final exam
- Replies: 4
- Views: 451
thoughts on final exam
Feel free to use this thread to talk about the final...
- Sun Dec 08, 2019 9:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 1
- Views: 198
final
can carbon monoxide bind to a heme complex?
- Sat Dec 07, 2019 3:20 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: solutions of weak acids and bases
- Replies: 1
- Views: 151
solutions of weak acids and bases
Can someone answer this learning objective from the acids and bases section?
"Why do salts of weak bases produce acidic solutions and salts of weak acids produce basic solutions?"
"Why do salts of weak bases produce acidic solutions and salts of weak acids produce basic solutions?"
- Sat Nov 30, 2019 11:34 am
- Forum: Naming
- Topic: ethelynediaminetetraaceto
- Replies: 2
- Views: 256
ethelynediaminetetraaceto
What is the chemical formula for the ligand ethelynediaminetetraaceto?
- Fri Nov 29, 2019 11:56 am
- Forum: Bronsted Acids & Bases
- Topic: Difference between bronsted and lewis acid/base?
- Replies: 6
- Views: 358
Re: Difference between bronsted and lewis acid/base?
bronsted refers to an exchange of protons. Lewis refers to an exchange of electrons
- Fri Nov 29, 2019 11:23 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: cis platinum
- Replies: 6
- Views: 423
cis platinum
What is the importance of cisplatinum?
- Fri Nov 29, 2019 11:12 am
- Forum: Naming
- Topic: charge of trnasition metal
- Replies: 4
- Views: 301
charge of trnasition metal
Is the charge of the transition metal always going to be given to us? If not, how do we know it?
- Sat Nov 23, 2019 11:08 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: ligand
- Replies: 3
- Views: 276
ligand
What is a ligand??
- Mon Nov 18, 2019 9:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Boiling point Pbr3 and PF3
- Replies: 1
- Views: 603
Boiling point Pbr3 and PF3
Why does PBr3 have a higher boiling point than PF3? I thought since the bonds in PF3 are stronger (smaller atoms--> shorter bond length --> stronger bond) it would have a much higher boiling point than PBr3. The solutions manual says that since PBr3 has more electrons, it has a higher boiling point....
- Sun Nov 17, 2019 1:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: vapor pressure
- Replies: 4
- Views: 339
vapor pressure
Do we have to know vapor pressure for test 2? If so what is it?
- Sat Nov 16, 2019 10:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: dipole-dipole
- Replies: 3
- Views: 256
dipole-dipole
How does NH2OH have a dipole-dipole intermolecular force? That means that NH2OH would have to be a polar molecule, but the electronegativity difference between all the elements is very small. Could someone please explain this? Maybe a picture showing the dipole moment if you could find one?
- Fri Nov 15, 2019 8:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: regions of electron density
- Replies: 7
- Views: 569
regions of electron density
What can classify as a region of electron density in a molecule?
- Fri Nov 15, 2019 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: seesaw
- Replies: 9
- Views: 672
seesaw
What is the seesaw shape?
- Fri Nov 15, 2019 8:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: test 2
- Replies: 13
- Views: 746
test 2
Do we have to know hybridization for test 2?
- Fri Nov 15, 2019 8:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: London dispersion forces and vander waals
- Replies: 5
- Views: 540
London dispersion forces and vander waals
Could someone please give me an example to explain london dispersion forces and vanderwaals.
- Fri Nov 15, 2019 8:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: clouds of electrons
- Replies: 3
- Views: 222
clouds of electrons
In SO2, for the oxygen that has a single bond to the sulfur atom, could we count the 3 lone pairs on the oxygen atom to be its own region of electron density? Or would we count those three lone pairs and the electrons bonded between the sulfur tom as one region of electron density?
- Fri Nov 15, 2019 8:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bent v. straight shape
- Replies: 3
- Views: 289
bent v. straight shape
On exercise 2E.1, it shows 2 ball-stick models. One of them is a bent shape the other is a linear shape. It asks which model would have lone pairs. How would I know which model would or would not have lone pairs based on the ball and stick shapes?
- Mon Nov 11, 2019 12:47 pm
- Forum: Sigma & Pi Bonds
- Topic: Chemical Bonds in chemistry
- Replies: 3
- Views: 254
Re: Chemical Bonds in chemistry
covalent, ionic and metallic are the 3 types of atomic bonds.
- Mon Nov 11, 2019 12:46 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9190
Re: Rydberg equation [ENDORSED]
The Ryberg equation measures energy levels
- Mon Nov 11, 2019 12:45 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: nomenclature
- Replies: 3
- Views: 280
Re: nomenclature
Lavelle hasn't formally discussed nomenclatures yet, so I don't think we should worry about it until it comes up. But it's nice to now basic prefixes like tri- means three and so on.
- Mon Nov 11, 2019 12:42 pm
- Forum: Octet Exceptions
- Topic: More then 8 electrons
- Replies: 5
- Views: 434
Re: More then 8 electrons
If the highest energy level is a d orbital, then yes, the atom can hold up to 10 valence electrons.
- Mon Nov 11, 2019 12:39 pm
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12809
Re: Noble Gases
Noble gases have no electronegativity because they already have a full octet
- Mon Nov 11, 2019 12:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole moment
- Replies: 4
- Views: 296
Dipole moment
Can someone please define what a dipole moment is?
- Sun Nov 03, 2019 3:45 pm
- Forum: Properties of Light
- Topic: MeV
- Replies: 2
- Views: 110
MeV
What does MeV mean?
- Sun Nov 03, 2019 3:45 pm
- Forum: Resonance Structures
- Topic: moving an electron
- Replies: 4
- Views: 265
moving an electron
Does a resonance structure just mean moving an electron around?
- Sun Nov 03, 2019 3:44 pm
- Forum: Dipole Moments
- Topic: Dipole moment
- Replies: 2
- Views: 112
Dipole moment
How do you calculate the dipole moment if we are not given the electronegativity values?
- Sun Nov 03, 2019 3:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: middle atom
- Replies: 13
- Views: 548
middle atom
How do we pick the central atom for a lewis dot structure of a molecule?
- Sun Nov 03, 2019 3:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: observed bond length
- Replies: 2
- Views: 150
observed bond length
What is an observed bond length and what does it have to do with resonance structures?
- Mon Oct 28, 2019 12:08 pm
- Forum: Bond Lengths & Energies
- Topic: Bond length strength
- Replies: 6
- Views: 318
Re: Bond length strength
In general, bonding strength and length is proportional to one another. And bond length is always given by experiemental data.
- Sat Oct 26, 2019 9:32 am
- Forum: Quantum Numbers and The H-Atom
- Topic: ionization energy and electron affinty
- Replies: 3
- Views: 181
ionization energy and electron affinty
What's the difference between electron affinity and ionization energy?
- Sat Oct 26, 2019 9:30 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: oribital numbers
- Replies: 7
- Views: 268
oribital numbers
How do I know how many oribitals there are in s,p,d,f?
- Sat Oct 26, 2019 9:25 am
- Forum: Trends in The Periodic Table
- Topic: atomic radius
- Replies: 3
- Views: 191
atomic radius
What is an atomic radius and how do we calculate it?
- Sat Oct 26, 2019 9:25 am
- Forum: Trends in The Periodic Table
- Topic: ionic radius
- Replies: 3
- Views: 137
ionic radius
What is an ionic radius and how do we calculate it?
- Sat Oct 26, 2019 9:23 am
- Forum: *Shrodinger Equation
- Topic: Schrodinger's equation
- Replies: 2
- Views: 298
Schrodinger's equation
Can someone explain the relationship between schrodingers equation, wave functions and orbitals?
- Wed Oct 16, 2019 11:33 pm
- Forum: Properties of Light
- Topic: Vacuum
- Replies: 3
- Views: 148
Vacuum
I know the speed of light is 3x 10^8 m/s in a vacuum, but what exactly is a vacuum?
- Wed Oct 16, 2019 11:30 pm
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 2153
What are the units of hertz
I know Hz is measured per second, but what per second??
- Wed Oct 16, 2019 11:29 pm
- Forum: Properties of Light
- Topic: Speed of light
- Replies: 13
- Views: 379
Speed of light
Why do we use the speed of light to calculate the wavelength and frequency of electromagnetic waves, like radiowaves?
- Wed Oct 16, 2019 11:22 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3572
Re: Best Way To Study?
I usually look at the outline and make sure I know every topic on there.
- Wed Oct 16, 2019 11:21 pm
- Forum: Properties of Electrons
- Topic: Momentum
- Replies: 11
- Views: 317
Momentum
How is momentum defined and is it different than velocity?
- Wed Oct 09, 2019 9:17 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Symbols for Molarity
- Replies: 8
- Views: 1305
Re: Symbols for Molarity
I would practice with just a symbol and be consistent with it. A lot of the workshops that I went to used problems that only use M as the symbol for molarity, so you may want to use that on your test.
- Wed Oct 09, 2019 9:15 pm
- Forum: SI Units, Unit Conversions
- Topic: Test 1_Supplies [ENDORSED]
- Replies: 5
- Views: 227
Re: Test 1_Supplies [ENDORSED]
We are also given a reference sheet that has equations, som unit conversions and constants on it.
- Wed Oct 09, 2019 9:13 pm
- Forum: Significant Figures
- Topic: %Mass Composition
- Replies: 12
- Views: 791
Re: %Mass Composition
The sig figs are determined by the numbers provided in the initial problem. I.e. if a problem included 2.15 then your answer would be 3 sig figs.
- Wed Oct 09, 2019 9:11 pm
- Forum: Significant Figures
- Topic: Range of Sig Figs
- Replies: 8
- Views: 537
Re: Range of Sig Figs
The number of sig figs are determined by the numbers mentioned in the inital problem.
- Wed Oct 09, 2019 9:09 pm
- Forum: Properties of Light
- Topic: Planck's constant
- Replies: 2
- Views: 109
Planck's constant
Can someone explain how Planck's constant is derived and its significance?
- Thu Oct 03, 2019 11:04 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Aqueous, solid, gas
- Replies: 11
- Views: 16563
Re: Aqueous, solid, gas
In most problems that we have seen so far it usually mentions what state the compound/ molecule/ element is in, so I wouldn't worry about it for now for his upcoming exam.
- Mon Sep 30, 2019 8:33 pm
- Forum: Significant Figures
- Topic: Rounding significant figures when it comes to elements of the periodic table
- Replies: 6
- Views: 333
Re: Rounding significant figures when it comes to elements of the periodic table
For tests and exams, I would refer directly to the periodic table that is given for the exam and not round numbers.
- Mon Sep 30, 2019 8:23 pm
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula
- Replies: 7
- Views: 417
Re: Empirical Formula
You only assume that the sample is 100g to make the calculations easier. For example if a CH4 sample contains 20% carbon but the sample itself is only 10 grams. You could assume for a second that the sample was 100 grams and 20 grams of that was carbon. Then you could use that ratio to say a 10 g sa...
- Mon Sep 30, 2019 8:19 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mole ratios
- Replies: 4
- Views: 258
Mole ratios
If you have 0.018 mol NaCl in a NaCl + H2O solution, you also have to have 1 mol of NaCl and 1 H2O because of the stoichiometric coefficients. How can this be possible if you only have 0.018 mol NaCl present in the solution, but you have to have at least 1 mol of NaCl for the solution?
- Fri Sep 27, 2019 6:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 32
- Views: 43813
Re: Ionic vs Covalent
Ionic bonds are usually stronger than covalent bonds. A defining characteristic of ionic bonds is that an electron from one atom is "taken" by another atom, whereas in covalent bonds, the electron is shared between the two atoms.
- Fri Sep 27, 2019 6:42 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Stoichiometric reactions
- Replies: 5
- Views: 3109
Re: Stoichiometric reactions
With stoichiometric problems, think about it as an equation. An equation such as 1=2 is simply not true. In chemistry, it's essentially the same concept. You have to have the same number of atoms on each side of the equation. So if you have N2 on one side you have to have N2 on the other side. The c...