CHEMISTRY COMMUNITY

Hannah Morales 1D

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!

Hannah Morales 1D

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...

Hannah Morales 1D

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?

Hannah Morales 1D

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)?

Hannah Morales 1D

What are chelating ligands( diff between a reg ligand?) and what do they have to do with coordination compounds?

Hannah Morales 1D

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...

Hannah Morales 1D

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?

Hannah Morales 1D

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.

Hannah Morales 1D

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?

Hannah Morales 1D

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...

Hannah Morales 1D

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...

Hannah Morales 1D

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...

Hannah Morales 1D

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...

Hannah Morales 1D

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!

https://www.youtube.com/watch?v=YeSuQm7KfaE

Hannah Morales 1D

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.

Hannah Morales 1D

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 ...

Hannah Morales 1D

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...

Hannah Morales 1D

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 ...

Hannah Morales 1D

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.

Hannah Morales 1D

What did he say about the trends for ionization energy and electronegative energy trends? And what exactly do they measure?

Hannah Morales 1D

No, there is no exceptions to the periodic trends. There are exceptions though to things like how the orbitals are filled.

Hannah Morales 1D

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)

Hannah Morales 1D

Yes the v in this equation is frequency

Hannah Morales 1D

I think it might be everything we’ve learned up till the quiz. So quantum and bonds might be on there.

Hannah Morales 1D

If you didn’t know the Rydberg formula is in
En = -hR/n^2 or frequency= -R( 1/n1^2 - 1/n2^2)

Hannah Morales 1D

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)

Hannah Morales 1D

Can there ever be an unidentified solid/gas and you would do the same thing Or willl we only ever come across unidentified metals?

Hannah Morales 1D

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!

Hannah Morales 1D

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...

Hannah Morales 1D

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...

Hannah Morales 1D

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 ...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: Bonds

When creating and acid-base equation [ENDORSED]

6th edition #12.19 [ENDORSED]

6th ed: Fundamentals J.1

Chelating ligands, ligands, and coordination compounds

If a ligand has a name with...

Bronsted vs. Lewis

Re: Test 3

How to state bond angles.

Central atoms in Lewis Structure

Re: Double bond question

Re: Pi Bonds

Calculate the Ionization energy... midterm Q3B

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

Re: Bond Length and Bond Strength

Re: Interaction Potential Energy equation

Re: 2.43 6th Edition

Re: Drawing orbitals

Re: Resonance Structures

Periodic table

Re: Periodic Trends

Re: Lewis Structures

Re: Energy Equations

Re: Test 2

Re: Rydberg formula

Re: Going from empirical to Molecular formula

Re: Fundamentals E.15

Quiz 1- Addition to what we should know?

Problem G.25

Re: knowing how many sig figs to use

Total Mass