## Search found 31 matches

Sun Dec 09, 2018 3:13 am
Forum: Bond Lengths & Energies
Topic: Bonds
Replies: 1
Views: 292

### Re: Bonds

I would think F2 has a stronger bond because the other two structures would be radicals since there is an uneven amount of electrons. I tried drawing the other two but couldn’t come up with anything other than radicals. Sorry and I hope this helps!
Sun Dec 09, 2018 3:03 am
Forum: Bronsted Acids & Bases
Topic: When creating and acid-base equation [ENDORSED]
Replies: 1
Views: 363

### When creating and acid-base equation[ENDORSED]

I am confused on when forming an equation, how do I know as to what is formed from the reactants? Is there a general guideline as to how something will be produced in bronsted acids/bases? I understand that bronsted base will accept a proton while bronsted acid will donate a proton and what conjugat...
Sun Dec 09, 2018 2:55 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6th edition #12.19 [ENDORSED]
Replies: 1
Views: 135

### 6th edition #12.19[ENDORSED]

The concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the difference in the pH values of the two solutions?

In the solutions manual it has

DeltapH = -log(.12[HCl]/[HCl])
How do you know as to cancel out HCl as shown above?
Sun Dec 02, 2018 2:22 pm
Forum: Bronsted Acids & Bases
Topic: 6th ed: Fundamentals J.1
Replies: 4
Views: 232

### 6th ed: Fundamentals J.1

How do you determine whether a compound is a bronsted base or acid?
a) NH3 b) HBr c)KOH d) H2SO3, e) Ca(OH)2

Are there any tips when deciding whether something is an acid or base (Bronsted)?
Sun Dec 02, 2018 11:40 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating ligands, ligands, and coordination compounds
Replies: 1
Views: 132

### Chelating ligands, ligands, and coordination compounds

What are chelating ligands( diff between a reg ligand?) and what do they have to do with coordination compounds?
Sun Dec 02, 2018 11:19 am
Forum: Naming
Topic: If a ligand has a name with...
Replies: 5
Views: 151

### If a ligand has a name with...

In Week 9 Wednesday's lecture, Dr. Lavelle put in his lectures if ligand has a name with Di-, Tri-, Tetra-, or Polydentate then use prefixes Bis-, Tris-, tetrakis-, pentakis- but what does that mean? What is an example of using a prefix like this? Is there a table that we can use that states when/ h...
Sun Dec 02, 2018 11:09 am
Forum: Lewis Acids & Bases
Topic: Bronsted vs. Lewis
Replies: 3
Views: 113

### Bronsted vs. Lewis

What is an example (problem) where we are using a Bronsted Acid/ Base or a Lewis Acid/Base?

Can Bronsted acid/base be in a same problem(chemical reaction equation) as lewis acids/ bases? When would I know to label something as a bronsted acid/base or lewis acid/base?
Sat Nov 24, 2018 2:59 pm
Forum: Hybridization
Topic: Test 3
Replies: 13
Views: 387

### Re: Test 3

Test 3 covers: End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure (see Syllabus and Outlines for details).

So I believe that You are right about what was covered right after the midterm and right before we left for break but I’m not entirely sure.
Sat Nov 24, 2018 2:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to state bond angles.
Replies: 7
Views: 285

### How to state bond angles.

During any test do we have to give an approximate bond angle, for instance “107.5 degrees” or can we just put “slightly less than 109.5 degrees” for the answer?
Sat Nov 24, 2018 2:33 pm
Forum: Lewis Structures
Topic: Central atoms in Lewis Structure
Replies: 1
Views: 114

### Central atoms in Lewis Structure

I need a refresher on which atom should be the central atom and if there is any special cases? I was doing some VSPR questions earlier that asked me to draw the Lewis structure but I kept putting oxygen as the central atom when it was suppose to be Cl as the central atom. Why would Cl be the central...
Sat Nov 17, 2018 1:53 pm
Forum: Sigma & Pi Bonds
Topic: Double bond question
Replies: 1
Views: 111

### Re: Double bond question

As for the double bonds I just think that as you increase in bonds you have this pattern: 1 bond: 1 sigma bond Double bond: 1 sigma bond and 1 pi bond Triple bond: 1 sigma bond and 2 pi bond. (Found on the internet) This is because the extra orbitals are so close together ( triple bonds shorter than...
Sat Nov 17, 2018 1:38 pm
Forum: Sigma & Pi Bonds
Topic: Pi Bonds
Replies: 1
Views: 94

### Re: Pi Bonds

So as the definition states a pi bond is two orbitals, each with 1 e- overlap side-by-side. As a visualization I think of two vertical dumbbells with the orbits clashing together. As for the double bonds I just think that as you increase in bonds you have this pattern: 1 bond: 1 sigma bond Double bo...
Sat Nov 17, 2018 12:08 pm
Forum: Photoelectric Effect
Topic: Calculate the Ionization energy... midterm Q3B
Replies: 1
Views: 447

### Calculate the Ionization energy... midterm Q3B

Calculate the ionization energy or a rubidium atom, given that radiation of a wavelength 58.4 no produces electrons with a speed of 2450 km*s^-1, recall that 1J= 1kg*m^2*s^-2 So I am a bit confused on this question because what I did was that Frequency= c(speed of light)/wavelength( 58.4*10^-9m) The...
Thu Nov 08, 2018 1:46 am
Forum: Dipole Moments
Topic: Helpful Sum up Video on bonds, van der waals, dipole moments, etc.
Replies: 1
Views: 123

### Helpful Sum up Video on bonds, van der waals, dipole moments, etc.

Hey everyone! So I noticed quite a few questions in regards to bondings, electronegativity and etc, so I just wanted to share this quick cartoon video that I found really helpful!

I Hope this helps you too!

Thu Nov 08, 2018 1:37 am
Forum: Bond Lengths & Energies
Topic: Bond Length and Bond Strength
Replies: 5
Views: 224

### Re: Bond Length and Bond Strength

Yup!
Also, single bonds are considered the weakest because they are the longest. Following the weakest in strength, would be double bonds, then triple bonds and etc. because each bond has more electrons to pull/ share the electrons between molecules/ atoms.
Thu Nov 08, 2018 1:31 am
Forum: Bond Lengths & Energies
Topic: Interaction Potential Energy equation
Replies: 2
Views: 141

### Re: Interaction Potential Energy equation

polarizability depends on the number of electrons and size of atom or molecule, while the distance (r) increases as interaction decreases. (I'm not entirely sure how you can find r, but I'm pretty sure if it was in a question it might just be given or you might have to estimate it based on periodic ...
Sun Nov 04, 2018 11:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.43 6th Edition
Replies: 1
Views: 145

### Re: 2.43 6th Edition

For a) it would actually be [Kr} 4d^10 5s^1 because it is in the second row of the transition metals ( d orbital section) your understanding of this concept however is correct in that it is more stable when it is half filled/ filled. e) it is because the pairing energy is less than the energy requir...
Sun Nov 04, 2018 11:37 am
Forum: Quantum Numbers and The H-Atom
Topic: Drawing orbitals
Replies: 4
Views: 756

### Re: Drawing orbitals

I believe that what your TA is trying to say by drawing 3px, 3py, and 3pz orbitals is by drawing a bell shaped on those axis. For instance, for 3px you will draw the bell shape on the x axis, 3py on the y axis, and 3pz on the z axis. These orbitals is where the electron will lie. After you draw the ...
Sun Nov 04, 2018 11:05 am
Forum: Octet Exceptions
Topic: Resonance Structures
Replies: 7
Views: 395

### Re: Resonance Structures

Usually, you want the formal charge to be on the outside atoms and not the central atom. So maybe just keep the resonance structures with the formal charge on the outside. Another rule that applies to formal charge is that the formal charge is found on the most electronegative atom of the molecule.
Mon Oct 29, 2018 7:00 am
Forum: Trends in The Periodic Table
Topic: Periodic table
Replies: 4
Views: 254

### Periodic table

What did he say about the trends for ionization energy and electronegative energy trends? And what exactly do they measure?
Mon Oct 29, 2018 6:54 am
Forum: Electronegativity
Topic: Periodic Trends
Replies: 8
Views: 326

### Re: Periodic Trends

No, there is no exceptions to the periodic trends. There are exceptions though to things like how the orbitals are filled.
Mon Oct 29, 2018 6:47 am
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 13
Views: 385

### Re: Lewis Structures

You put the one with lowest ionization level, but there are also some tricks that you can remember.

1) HS- hydrogen won’t be in the middle S will( hydrogen is never in the middle!)
2) CHO
Carbon is in the middle here (lower)
Wed Oct 17, 2018 5:51 pm
Forum: Einstein Equation
Topic: Energy Equations
Replies: 4
Views: 183

### Re: Energy Equations

Yes the v in this equation is frequency
Wed Oct 17, 2018 5:41 pm
Forum: *Shrodinger Equation
Topic: Test 2
Replies: 5
Views: 384

### Re: Test 2

I think it might be everything we’ve learned up till the quiz. So quantum and bonds might be on there.
Wed Oct 17, 2018 2:51 pm
Forum: Properties of Light
Topic: Rydberg formula
Replies: 8
Views: 328

### Re: Rydberg formula

If you didn’t know the Rydberg formula is in
En = -hR/n^2 or frequency= -R( 1/n1^2 - 1/n2^2)
Tue Oct 09, 2018 5:43 pm
Forum: Empirical & Molecular Formulas
Topic: Going from empirical to Molecular formula
Replies: 14
Views: 967

### Re: Going from empirical to Molecular formula

Yeah, it should be a whole number when you multiple it. If you get a decimal of some sort I believe it should be so close to a whole number value. Ex: 4.98-5.01 (would round up or round down respectively to get 5)
Tue Oct 09, 2018 5:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals E.15
Replies: 3
Views: 180

### Re: Fundamentals E.15

Can there ever be an unidentified solid/gas and you would do the same thing Or willl we only ever come across unidentified metals?
Tue Oct 09, 2018 5:30 pm
Forum: SI Units, Unit Conversions
Topic: Quiz 1- Addition to what we should know?
Replies: 5
Views: 325

### Quiz 1- Addition to what we should know?

Should we know the formula for certain anions/cations formulas for our quiz?

Ex:
should we know what acetate, etc is? or sulfate? would it be given to us?

Thanks!
Fri Oct 05, 2018 4:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem G.25
Replies: 1
Views: 131

### Problem G.25

So this problem was really easy at the beginning, but it quickly turned hard at the end. The question is " G.25 Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this ques...
Fri Oct 05, 2018 4:40 pm
Forum: Significant Figures
Topic: knowing how many sig figs to use
Replies: 17
Views: 991

### Re: knowing how many sig figs to use

I tend to think that with sig figs it is the smallest amount of units in a number from the question. So say if in a question the mass of something is 3.01g, you sig figs for your answer should be three units because in this instance, there is three units in the question. Sorry if that wasn't much he...
Fri Oct 05, 2018 4:36 pm
Forum: Limiting Reactant Calculations
Topic: Total Mass
Replies: 2
Views: 88

### Total Mass

For a problem, I was asked what fraction was the total mass due to oxygen? The solution manual said that you were supposed to do it a specific way but the way that I did it was as follows: E.29D) 1. I got the mol of H20 and multiplied the molar mass of oxygen to get 2.67 grams of oxygen. EX: 0.1668 ...