Search found 30 matches

by 604656370
Mon Dec 10, 2018 12:57 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Boiling Point
Replies: 4
Views: 424

Re: Boiling Point

You should look at the bond length. Longer bond length means weaker bonds which can be broken with lower energy (lower boiling point). Smaller bond lengths are stronger and thus require more energy (higher boiling point).
by 604656370
Mon Dec 10, 2018 12:54 am
Forum: Properties of Light
Topic: Snail velocity final problem
Replies: 3
Views: 294

Re: Snail velocity final problem

Do you remember the exact wording of the question? What info was given about the gamma ray? Would it have been possible to find E(photon) using E=hv and then using that as the Ek for the snail?
by 604656370
Mon Dec 10, 2018 12:41 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why HClO2 is a stronger acid than HBrO2?
Replies: 6
Views: 6105

Re: Why HClO2 is a stronger acid than HBrO2?

Does this apply to HNO3 and HNO2 as well? I said HNO3 is stronger because the extra oygen in the molecule helps stabilize the charge from the lone pair.
by 604656370
Mon Dec 10, 2018 12:35 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strengths of H2S vs H2Se
Replies: 4
Views: 308

Re: Strengths of H2S vs H2Se

LDF is found in every bond because its the most basic form of molecular attraction. Since electrons are constantly moving, at any given time, one atom will be more electronegative than the other atom. Thus, there will always be some degree of induced dipole-induced dipole (also known as LDF).
by 604656370
Mon Dec 10, 2018 12:18 am
Forum: Administrative Questions and Class Announcements
Topic: Discussion Posts
Replies: 2
Views: 205

Discussion Posts

How many of these discussion posts do we need to have? And does this week count towards them?
by 604656370
Mon Dec 10, 2018 12:16 am
Forum: Biological Examples
Topic: Cisplatin
Replies: 4
Views: 175

Re: Cisplatin

Its a Platinum atom bonded to two Cl atoms and 2 NH3 atoms. The cis also implies that the Cl are on the same side. At least that's what my TA said.
by 604656370
Sun Nov 25, 2018 10:31 pm
Forum: Hybridization
Topic: Test 3
Replies: 7
Views: 135

Re: Test 3

Do you know what topics will be covered? I know VSEPR, hybridization, bond angles & shapes will be on the test but am I missing anything else?
by 604656370
Sun Nov 25, 2018 10:23 pm
Forum: Properties of Light
Topic: Speed of light
Replies: 13
Views: 232

Re: Speed of light

I've been using 3.0X10^8 m/s but just to be safe, use the constants he provides on the formula sheet.
by 604656370
Sun Nov 25, 2018 10:18 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 2
Views: 170

Re: Radicals

From what I remember, my TA said it shouldn't matter for this class. Just place the unpaired electron in a way that the formal charge is as close to 0 as possible.
by 604656370
Sun Nov 18, 2018 9:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Types of Bonds
Replies: 4
Views: 71

Re: Types of Bonds

Sigma bonds are the initial and strongest bonds formed between two atoms, whereas pi bonds are the subsequent bonds (2nd and 3rd) formed between the same atoms. For example, in O2 (double bond), the first bond created would be a sigma bond and the second one would be a pi bond. In N2 (triple bond), ...
by 604656370
Sun Nov 18, 2018 8:58 pm
Forum: Hybridization
Topic: Sigma/Pi bonds
Replies: 6
Views: 138

Re: Sigma/Pi bonds

Identifying the bonds allows you to determine bond strengths and lenghts (not the exact number but relative to other molecules/bonds).
by 604656370
Sun Nov 11, 2018 10:49 pm
Forum: Electronegativity
Topic: Greater Ionic character
Replies: 3
Views: 83

Re: Greater Ionic character

Since sulfur is a period below oxygen, it is less electronegative than oxygen. Therefore, the difference in electronegativity between carbon and oxygen will be greater than that of carbon and sulfur.
by 604656370
Sun Nov 11, 2018 5:42 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi Bonds
Replies: 3
Views: 75

Re: Sigma vs. Pi Bonds

Sigma bonds are the initial and strongest bonds formed between two atoms, whereas pi bonds are the subsequent bonds formed between the same atoms. For example, in O2 (double bond), the first bond created would be a sigma bond and the second one would be a pi bond. In N2 (triple bond), the first woul...
by 604656370
Sun Nov 11, 2018 5:32 pm
Forum: Bond Lengths & Energies
Topic: 3.119 6th ed
Replies: 2
Views: 55

Re: 3.119 6th ed

Draw the lewis structure for both molecules and look at what kind of bonds are created (single, double, triple). Based on this you can figure out which bonds are longer and weaker or shorter and stronger; remember, triple bonds are the shortest and strongest because they involve the sharing of more ...
by 604656370
Sun Nov 04, 2018 11:57 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energies
Replies: 13
Views: 233

Re: Ionization Energies

How would you determine these trends for diagonal (non-adjacent) elements? For example, between Carbon and Sulfur.
by 604656370
Sun Nov 04, 2018 11:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ms quantum number relevancy on the midterm
Replies: 4
Views: 112

Re: Ms quantum number relevancy on the midterm

The Ms also helps with understanding Hund's Rule which states: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied. This question popped up on the practice midterm too.
by 604656370
Sun Nov 04, 2018 11:48 pm
Forum: Quantum Numbers and The H-Atom
Topic: Test Quantum Numbers
Replies: 4
Views: 122

Re: Test Quantum Numbers

Since n = 5 and l = 1 this would be the 5p orbital. And the p orbitals can hold 6 electrons. Therefore, 6 electrons can have those quantum numbers.
by 604656370
Mon Oct 29, 2018 12:00 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Transitions
Replies: 1
Views: 71

Re: Electron Transitions

Did you use this equation: ? If you use this, which is derived from
you should get the right answer.
by 604656370
Sun Oct 28, 2018 11:13 pm
Forum: Significant Figures
Topic: Sig Figs on MT
Replies: 2
Views: 2132

Re: Sig Figs on MT

Yes, that's correct. My TA mentioned that if we had the right answer but wrong sig figs, we would lose partial credit.
by 604656370
Sun Oct 28, 2018 11:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Heisenberg
Replies: 2
Views: 90

Re: Heisenberg

Yes, that is correct! The uncertainty in velocity is the aggregate unknown velocity. For instance, if the velocity is stated to be 1 m/s +/- 0.55 m/s then the velocity could be between 0.45 m/s and 1.55 m/s. Thus, the uncertainty would be 1.55 - 0.45 = 1.10 m/s (or 2 X 0.55).
by 604656370
Sun Oct 21, 2018 11:33 pm
Forum: Properties of Light
Topic: Quantum Equations
Replies: 3
Views: 70

Re: Quantum Equations

Based on the question, you can figure out what it's trying to ask and only use the necessary equation. A lot of questions are phrased similarly so doing enough will help you figure out which situations require which equations.
by 604656370
Sun Oct 21, 2018 11:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW problem 1E.1
Replies: 1
Views: 42

Re: HW problem 1E.1

The answers shouldn't be different for a Hydrogen atom - (a)-(d) should still increase. It might just be a trick question to see if you understand the concept.
by 604656370
Sun Oct 21, 2018 11:05 pm
Forum: Properties of Light
Topic: Visible Light
Replies: 5
Views: 68

Re: Visible Light

My TA mentioned that it's safe to assume visibe light is between 400-700nm.
by 604656370
Sun Oct 14, 2018 11:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion Points
Replies: 1
Views: 48

Re: Discussion Points

You need to post 3 times per week (1pt per post) with either questions or repsonses to questions by Sunday 11:59 PM.
by 604656370
Sun Oct 14, 2018 11:29 pm
Forum: Properties of Electrons
Topic: Wavelength Calculations
Replies: 5
Views: 116

Re: Wavelength Calculations

The both are constants. The first number, h, is Planck's constant whereas the second number, c, is the speed of light. And for reference, the formula is
by 604656370
Sun Oct 14, 2018 11:22 pm
Forum: Properties of Light
Topic: 1A.3 7th Edition Question
Replies: 4
Views: 84

Re: 1A.3 7th Edition Question

Exactly. Frequency and wavelength have an inverse relationship so as one increases, the other decreases. In this case, decreasing frequency means increasing wavelength. If you were to visualize this, it would mean the waves are getting elongated (less steep). Therefore, the slope decreases as well.
by 604656370
Sun Oct 07, 2018 10:01 pm
Forum: Limiting Reactant Calculations
Topic: Section L, #35
Replies: 2
Views: 71

Re: Section L, #35

I was stuck on this one too but figured out that you can add the three reactions. The result will give you: Fe + 2Br2 + Na2CO3 ---> NaBr + CO2 + Fe3O4 Using this equation, you would need to: 1. Balance the equation 2. Calculate the moles of NaBr given you have 2.5t 3. Using the moles of NaBr and the...
by 604656370
Sun Oct 07, 2018 9:42 pm
Forum: Limiting Reactant Calculations
Topic: Determine Limiting Reagent
Replies: 4
Views: 1128

Re: Determine Limiting Reagent

If I'm understanding your question correctly, I think the way the professor did it (and in my opinion the more intuitive way) is to calculate the moles of the reactants and then compare them using the equation. This method is pretty quick and sets you up to answer other questions the problem may pos...
by 604656370
Sun Oct 07, 2018 9:11 pm
Forum: Limiting Reactant Calculations
Topic: Question M11
Replies: 2
Views: 149

Re: Question M11

The first step woud be to find the number of moles of O2 and P4 in the reaction given that we have 5.77g of each. For example, since the molar mass of O2 is 32g/mol and we have a sample with 5.77g, there will be 5.77g / (32g/mol) = 0.180 mol of O2. Similarly, you can calculate that there are 0.0465 ...

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