Search found 38 matches

by Jaquelinne Rodriguez-Lopez 1L
Sun Jun 10, 2018 10:59 pm
Forum: Limiting Reactant Calculations
Topic: Question M8
Replies: 3
Views: 261

Re: Question M8

Can you specify what you need assistance on?
by Jaquelinne Rodriguez-Lopez 1L
Sun Jun 10, 2018 8:40 pm
Forum: Dipole Moments
Topic: Dipole Moment understanding
Replies: 5
Views: 340

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...
by Jaquelinne Rodriguez-Lopez 1L
Sun Jun 10, 2018 8:33 pm
Forum: Lewis Acids & Bases
Topic: j.3 neutralization page F84
Replies: 2
Views: 147

Re: j.3 neutralization page F84

Oh okay, I understand now. Thank you!
by Jaquelinne Rodriguez-Lopez 1L
Sun Jun 10, 2018 5:45 pm
Forum: Lewis Acids & Bases
Topic: j.3 neutralization page F84
Replies: 2
Views: 147

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...
by Jaquelinne Rodriguez-Lopez 1L
Thu Jun 07, 2018 2:53 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 352

Re: Bent vs. Angular

Thank you!
by Jaquelinne Rodriguez-Lopez 1L
Thu Jun 07, 2018 2:52 am
Forum: Determining Molecular Shape (VSEPR)
Topic: formal charge and VSEPR
Replies: 8
Views: 261

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
by Jaquelinne Rodriguez-Lopez 1L
Thu Jun 07, 2018 2:50 am
Forum: Naming
Topic: Oxidation
Replies: 3
Views: 215

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?
by Jaquelinne Rodriguez-Lopez 1L
Tue Jun 05, 2018 11:32 pm
Forum: Hybridization
Topic: The number before the sp
Replies: 3
Views: 149

Re: The number before the sp

I think that just refers to the energy level.
by Jaquelinne Rodriguez-Lopez 1L
Sat Jun 02, 2018 5:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: formal charge and VSEPR
Replies: 8
Views: 261

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...
by Jaquelinne Rodriguez-Lopez 1L
Thu May 31, 2018 10:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 352

Bent vs. Angular

Can we use the terms "bent" and "angular" interchangeably?
by Jaquelinne Rodriguez-Lopez 1L
Tue May 22, 2018 4:32 pm
Forum: Lewis Structures
Topic: problem 3.57 part b
Replies: 1
Views: 97

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.
by Jaquelinne Rodriguez-Lopez 1L
Tue May 22, 2018 4:26 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond Definition
Replies: 14
Views: 658

Re: Coordinate Covalent Bond Definition

That sounds like the correct definition. You can also find the definition of coordinate covalent bond on page 89.
by Jaquelinne Rodriguez-Lopez 1L
Tue May 22, 2018 3:19 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: self-test 3.13B
Replies: 1
Views: 198

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...
by Jaquelinne Rodriguez-Lopez 1L
Sun May 20, 2018 6:30 pm
Forum: Octet Exceptions
Topic: Self-Test 3.10A
Replies: 1
Views: 111

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!
by Jaquelinne Rodriguez-Lopez 1L
Tue May 15, 2018 2:07 pm
Forum: Trends in The Periodic Table
Topic: 2.6B
Replies: 2
Views: 162

Re: 2.6B

Thank you, that makes much more sense!
by Jaquelinne Rodriguez-Lopez 1L
Mon May 14, 2018 10:05 pm
Forum: Trends in The Periodic Table
Topic: 2.6B
Replies: 2
Views: 162

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...
by Jaquelinne Rodriguez-Lopez 1L
Sun May 13, 2018 10:30 pm
Forum: Resonance Structures
Topic: Resonance Structure Problems
Replies: 3
Views: 146

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.
by Jaquelinne Rodriguez-Lopez 1L
Sun May 13, 2018 10:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Paramagnetic vs Diamagnetic
Replies: 2
Views: 165

Re: Paramagnetic vs Diamagnetic

Also, pair electrons must be shown by half arrows in opposite directions of each other.
by Jaquelinne Rodriguez-Lopez 1L
Sun May 13, 2018 4:29 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spherical polar coordinates
Replies: 2
Views: 140

Spherical polar coordinates

must we be familiar with spherical polar coordinates? From chapter 2.2
by Jaquelinne Rodriguez-Lopez 1L
Sun May 06, 2018 11:39 pm
Forum: Student Social/Study Group
Topic: Midterm Study Group
Replies: 1
Views: 175

Re: Midterm Study Group

awesome, thanks!
by Jaquelinne Rodriguez-Lopez 1L
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: 192

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.
by Jaquelinne Rodriguez-Lopez 1L
Sun May 06, 2018 10:11 pm
Forum: Empirical & Molecular Formulas
Topic: Test 1/ Question 8 [ENDORSED]
Replies: 6
Views: 383

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.
by Jaquelinne Rodriguez-Lopez 1L
Sun May 06, 2018 10:11 pm
Forum: Empirical & Molecular Formulas
Topic: Test 1/ Question 8 [ENDORSED]
Replies: 6
Views: 383

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.
by Jaquelinne Rodriguez-Lopez 1L
Tue May 01, 2018 1:30 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.55 part b
Replies: 2
Views: 97

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.
by Jaquelinne Rodriguez-Lopez 1L
Tue May 01, 2018 1:11 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.37
Replies: 2
Views: 90

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.
by Jaquelinne Rodriguez-Lopez 1L
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: 85

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?
by Jaquelinne Rodriguez-Lopez 1L
Sat Apr 28, 2018 3:35 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Quiz #2 Question #2 B
Replies: 5
Views: 276

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 ...
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 22, 2018 11:19 pm
Forum: Student Social/Study Group
Topic: Study Group
Replies: 10
Views: 637

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?
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 22, 2018 11:13 pm
Forum: Einstein Equation
Topic: Joules unit conversion [ENDORSED]
Replies: 2
Views: 119

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)
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 22, 2018 11:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorizing spectrum
Replies: 5
Views: 170

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
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 22, 2018 10:59 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 4
Views: 183

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.
by Jaquelinne Rodriguez-Lopez 1L
Mon Apr 16, 2018 12:01 am
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53539

Re: Tutoring? [ENDORSED]

To know if you are eligible for AAP, go to Campbell hall front desk and check if you are (:
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 15, 2018 11:46 pm
Forum: Balancing Chemical Reactions
Topic: Trick to balance?
Replies: 5
Views: 316

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...
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 15, 2018 11:31 pm
Forum: Balancing Chemical Reactions
Topic: Practice Worksheet Week 1 Question 3 [ENDORSED]
Replies: 3
Views: 209

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...
by Jaquelinne Rodriguez-Lopez 1L
Sun Apr 15, 2018 11:22 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 338

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.
by Jaquelinne Rodriguez-Lopez 1L
Mon Apr 09, 2018 8:01 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations With Rational Coefficients [ENDORSED]
Replies: 3
Views: 129

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 ...

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