Search found 38 matches
- Sun Jun 10, 2018 10:59 pm
- Forum: Limiting Reactant Calculations
- Topic: Question M8
- Replies: 3
- Views: 691
Re: Question M8
Can you specify what you need assistance on?
- Sun Jun 10, 2018 8:40 pm
- Forum: Dipole Moments
- Topic: Dipole Moment understanding
- Replies: 5
- Views: 2105
Re: Dipole Moment understanding
a dipole moment is a direction of the arrow moving from a partially positive to a partially negative atom. a dipole moment can exist linearly. for example, in HCl, H is partially positive and Cl is partially negative so the dipole moment points toward Cl. Dipole moments can also be drawn on structur...
- Sun Jun 10, 2018 8:33 pm
- Forum: Lewis Acids & Bases
- Topic: j.3 neutralization page F84
- Replies: 2
- Views: 445
Re: j.3 neutralization page F84
Oh okay, I understand now. Thank you!
- Sun Jun 10, 2018 5:45 pm
- Forum: Lewis Acids & Bases
- Topic: j.3 neutralization page F84
- Replies: 2
- Views: 445
j.3 neutralization page F84
At the bottom of the section J.3, the textbook states that HCN is a weak acid. The book proceeds to show the reaction between HCN (weak acid) and OH- ( a base). The reaction shows the transfer of H+ from HCN to OH- to form H2O. HCN becomes fully deprotonated because it donates its only Hydrogen atom...
- Thu Jun 07, 2018 2:53 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs. Angular
- Replies: 11
- Views: 1184
Re: Bent vs. Angular
Thank you!
- Thu Jun 07, 2018 2:52 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: formal charge and VSEPR
- Replies: 8
- Views: 1061
Re: formal charge and VSEPR
"This is somewhat unrelated, but does VSEPR just refer to the notation? Like AXE4?"
yes, AXE is the VSEPR formula
yes, AXE is the VSEPR formula
Oxidation
Maybe naming of structures won't be in the final, but I would like to know how to find the oxidation number. Can someone explain how to find an oxidation number, including those in ion structures?
- Tue Jun 05, 2018 11:32 pm
- Forum: Hybridization
- Topic: The number before the sp
- Replies: 3
- Views: 483
Re: The number before the sp
I think that just refers to the energy level.
- Sat Jun 02, 2018 5:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: formal charge and VSEPR
- Replies: 8
- Views: 1061
formal charge and VSEPR
when figuring molecular shape, I've noticed that the textbook has Lewis structures that do not have the lowest formal charge. I know it does not matter as much because we can still figure out the shape. For the final do we draw the Lewis structure according to formal charge before figuring VSEPR sha...
- Thu May 31, 2018 10:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs. Angular
- Replies: 11
- Views: 1184
Bent vs. Angular
Can we use the terms "bent" and "angular" interchangeably?
- Tue May 22, 2018 4:32 pm
- Forum: Lewis Structures
- Topic: problem 3.57 part b
- Replies: 1
- Views: 335
Re: problem 3.57 part b
I double-checked...I see what you're saying. You're saying when sulfur is surrounded by three single bonds and two e-, can't hydrogen be bonded to any other oxygen by a single bond? I think you can. I just drew more than 4 resonance structures.
- Tue May 22, 2018 4:26 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bond Definition
- Replies: 14
- Views: 1864
Re: Coordinate Covalent Bond Definition
That sounds like the correct definition. You can also find the definition of coordinate covalent bond on page 89.
- Tue May 22, 2018 3:19 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: self-test 3.13B
- Replies: 1
- Views: 533
self-test 3.13B
Q: In which of the compounds CaS and CaO do the bonds have greater covalent character? My question: I noticed that Ca loses it's two electrons to both O and S, turning into Ca2+. therefore, both compounds will have the same polarizing cation. Why does CaS have a greater covalent character if its str...
- Sun May 20, 2018 6:30 pm
- Forum: Octet Exceptions
- Topic: Self-Test 3.10A
- Replies: 1
- Views: 335
Self-Test 3.10A
Pg. 88 gives the Lewis structure for XeF4 along with the number of electrons in the expanded shell. Xe has its 4d, 5s, and 5p orbits full. The structure on pg 88 shows Xe with 12 electrons. Why does XeF4 expand to 12 electrons and not 10 electrons?
Thanks!
Thanks!
- Sun May 20, 2018 3:12 pm
- Forum: Student Social/Study Group
- Topic: Spring 2018 Class Celebration
- Replies: 2
- Views: 672
- Tue May 15, 2018 2:07 pm
- Forum: Trends in The Periodic Table
- Topic: 2.6B
- Replies: 2
- Views: 446
Re: 2.6B
Thank you, that makes much more sense!
- Mon May 14, 2018 10:06 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Spherical polar coordinates
- Replies: 2
- Views: 408
Re: Spherical polar coordinates
Thank you!
- Mon May 14, 2018 10:05 pm
- Forum: Trends in The Periodic Table
- Topic: 2.6B
- Replies: 2
- Views: 446
2.6B
Q: Account for the large decrease in third ionization energy between beryllium and boron. the answer is: in the third ionization of Be, the electron is removed from the noble gas-core; however, in the third ionization of B, the electron is removed from the valence shell. core electrons are closer to...
- Sun May 13, 2018 10:30 pm
- Forum: Resonance Structures
- Topic: Resonance Structure Problems
- Replies: 3
- Views: 512
Re: Resonance Structure Problems
If you're asked for all resonance structures, you should give all of them. If a question is asking for just "a" resonance structure, just give write one. This is what I would do. The wording in the textbook can be tricky, tbh.
- Sun May 13, 2018 10:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Paramagnetic vs Diamagnetic
- Replies: 2
- Views: 434
Re: Paramagnetic vs Diamagnetic
Also, pair electrons must be shown by half arrows in opposite directions of each other.
- Sun May 13, 2018 4:29 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Spherical polar coordinates
- Replies: 2
- Views: 408
Spherical polar coordinates
must we be familiar with spherical polar coordinates? From chapter 2.2
- Sun May 06, 2018 11:39 pm
- Forum: Student Social/Study Group
- Topic: Midterm Study Group
- Replies: 1
- Views: 377
Re: Midterm Study Group
awesome, thanks!
- Sun May 06, 2018 11:36 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Difference between the quantum number for particle and electron
- Replies: 3
- Views: 507
Re: Difference between the quantum number for particle and electron
Isn't the quantum number just the energy level, so it would be the same for both? I am also confused by this.
- Sun May 06, 2018 10:11 pm
- Forum: Empirical & Molecular Formulas
- Topic: Test 1/ Question 8 [ENDORSED]
- Replies: 6
- Views: 1030
Re: Test 1/ Question 8 [ENDORSED]
you can find the molecular formula very easily by just counting how many of each element is present in the compound. to find the empirical formula, just simplify. if you can't simplify from the molecular formula, the molecular formula is also the empirical formula.
- Sun May 06, 2018 10:11 pm
- Forum: Empirical & Molecular Formulas
- Topic: Test 1/ Question 8 [ENDORSED]
- Replies: 6
- Views: 1030
Re: Test 1/ Question 8 [ENDORSED]
you can find the molecular formula very easily by just counting how many of each element is present in the compound. to find the empirical formula, just simplify. if you can't simplify from the molecular formula, the molecular formula is also the empirical formula.
- Tue May 01, 2018 1:30 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1.55 part b
- Replies: 2
- Views: 324
Re: 1.55 part b
the question states they express energy in terms of v/c with units cm^-1. cm^-1 is basically 1/cm, right? so in order to get cm/1, c in v/c must be brought up to the numerator, thus v*c.
- Tue May 01, 2018 1:11 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.37
- Replies: 2
- Views: 353
Re: 2.37
I don't recall professor Lavelle speaking about Zeff in class. However, he did speak about electrostatic attraction, where the electrons closer to the nucleus shield the nucleus' charge from outer electrons.
- Tue May 01, 2018 1:03 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals in Relation to Periodic Table
- Replies: 2
- Views: 270
Re: Orbitals in Relation to Periodic Table
Can you be a little more specific?
Are you not sure how the orbitals correlate with the periodic table?
Are you not sure how the orbitals correlate with the periodic table?
- Sat Apr 28, 2018 3:35 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Quiz #2 Question #2 B
- Replies: 5
- Views: 1909
Re: Quiz #2 Question #2 B
going from n=5 to n=3, the electron is moving 2 energy levels. whereas moving from m=4 to n=3, the electron is only moving one energy level. also remember, as an electron is going down energy levels, light is emitted. so it only makes sense that more energy in light form is emitted when moving from ...
- Sun Apr 22, 2018 11:19 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1619
Re: Study Group
Hello :)!!
I would like to be part of the study group session. Are any of you meeting on a different day besides Thursday?
I would like to be part of the study group session. Are any of you meeting on a different day besides Thursday?
- Sun Apr 22, 2018 11:13 pm
- Forum: Einstein Equation
- Topic: Joules unit conversion [ENDORSED]
- Replies: 2
- Views: 358
Re: Joules unit conversion [ENDORSED]
Joules is kg*(m^2/s^2) or kg*m^2*(s^2)^-1. remember, when you have a negative 1 exponent such as in m*s^-1, all it is saying is "m" over "s" (m/s)
- Sun Apr 22, 2018 11:08 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Memorizing spectrum
- Replies: 5
- Views: 765
Re: Memorizing spectrum
The chem PLF shared this funny phrase during a session to help us memorize the order: "Really man, I see you, ex genius".
Really = Radiowaves
man = microwaves
I = Infa-red
see = visible light (because you can SEE visible light)
you = ultra-violet
ex = x-rays
genius = gamma rays
Really = Radiowaves
man = microwaves
I = Infa-red
see = visible light (because you can SEE visible light)
you = ultra-violet
ex = x-rays
genius = gamma rays
- Sun Apr 22, 2018 10:59 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 4
- Views: 1008
Re: Work Function
The SI unit for the work function is Joules (J). If you're given e-volts, then you would have to convert the unit to joules.
- Mon Apr 16, 2018 12:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 262469
Re: Tutoring? [ENDORSED]
To know if you are eligible for AAP, go to Campbell hall front desk and check if you are (:
- Sun Apr 15, 2018 11:46 pm
- Forum: Balancing Chemical Reactions
- Topic: Trick to balance?
- Replies: 5
- Views: 812
Re: Trick to balance?
a trick that I learned in high school was to make a chart, as such. I count all the number of elements there are in the unbalanced equation and I try to have both the R (reactants) and P (products) equal to each other in the chart. E is for the element. It is sort of like a puzzle to me, which is go...
- Sun Apr 15, 2018 11:31 pm
- Forum: Balancing Chemical Reactions
- Topic: Practice Worksheet Week 1 Question 3 [ENDORSED]
- Replies: 3
- Views: 500
Re: Practice Worksheet Week 1 Question 3 [ENDORSED]
the molar mass of the compound should be 179.62 g.mol^-1: Sr: 1 * 87.62 N: 2 * 14.00 O: 4 * 16.00 when an equation has a compound multiplied by a subscript outside the parenthesis, make sure you distribute through multiplication the value of the subscript to each element inside the (____). so, in th...
- Sun Apr 15, 2018 11:22 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Molecular X
- Replies: 9
- Views: 1004
Re: Finding Molecular X
For combustions problems, you most likely need to use Avogadro's constant to find mols before proceeding to find the mass percentage. Also, if you haven't already, sign up for peer learning sessions with AAP. We went over this last week.
- Mon Apr 09, 2018 8:01 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Equations With Rational Coefficients [ENDORSED]
- Replies: 3
- Views: 557
Re: Balancing Equations With Rational Coefficients [ENDORSED]
The fractions are quite confusing. In the video, he does mention that he does not want to use "6.5" because it is not a whole number. by writing 6.5 as a fraction, 13/2, we are able to remove the 2 from the fraction through multiplication. Because we multiply by 2 on the reactant side, we ...