CHEMISTRY COMMUNITY

Adriana_Bustamante_3L

This question is in reference to 14.5 the equation: O_3(aq)+Br^-(aq) \rightarrow O_2(g)+BrO_3^-(aq) O_3 is the oxidizing agent, but I'm having trouble seeing why because both O_3 and O_2 are neutral. Can somebody please explain to me why O_3 is the oxidizing agent? Is...

Adriana_Bustamante_3L

You can find all the given formulas for the exams on page 125 of your course reader, titled: Constants and Formulas

Adriana_Bustamante_3L

Where does the equation $\Delta H_freeze=-\Delta H_fus$ come from? This is used in example 9.10 when calculating the change in entry of the surroundings when mercury freezes at 224K and $\Delta H_fus=2.292kJ/mol$

Adriana_Bustamante_3L

Would reaction enthalpy (deltaH) multiply by 2 if you multiplied the entire equation by 2?
Would Gibbs do this?

Adriana_Bustamante_3L

When designing a battery and given two values when given Estandard values Ex. F2 (g) + 2H^+(aq) + 2 e^- -----> 2HF (aq) E standard=+3.03 V F2 (g) +2e^- -------> 2F^-(aq) E standard=+2.87 V Do we reverse any of the reactions to get negative E standard values? Or do we plug them in just the way they a...

Adriana_Bustamante_3L

Very helpful, thanks!

Adriana_Bustamante_3L

I don't understand where the SN1 and SN2 type of reactions are coming from. Where are they coming from? What do they apply to? Are they in the course reader? Are they talked about in the intro to OChem book? Please help!

Adriana_Bustamante_3L

I understand that parent chains are named last. However, I'm not sure if parent chains are supposed to receive the lowest numbering. For example, in Quiz 3 Prep1 Question 3, it asks for the name of CH3CH=C(CH3)CH(CH3)2 the answer gives 3,4-dimethyl-2-pentene.
I would have put 2,3-dimethyl-3-pentene.

Adriana_Bustamante_3L

Why is it that, in the introduction to OChem textbook, H3C--C^+H--CH3 has a middle carbon that is positively charged, but has six valence electrons? I thought that since Carbon typically has four valence electrons, six valence electrons would make it into a negative charge? Someone please explain. T...

Adriana_Bustamante_3L

Yes, thank you so much!!

Adriana_Bustamante_3L

So the first practice quiz, question 4, you are trying to get the final equation: 2A+D-->C using the equations 1) 2A+B-->3C+E 2) 2B-->A+D+E 3) E-->3B+C The workbook says the correct way to do it is by taking 1/2DH1-DH2-1/2DH3 (Where D is delta). I tried that, but I'm not getting the final equation. ...

Adriana_Bustamante_3L

Super helpful, thanks (:

Adriana_Bustamante_3L

I'm having trouble keeping the work of compression straight.

When gas in a system is compressed is the work done ON or BY the system?
Also, why is it that w and u are positive when gas in a system is compressed? Is it because the smaller volume encourages collisions?

Adriana_Bustamante_3L

You mostly have to have your VSPER shapes memorized, as you need to be able to recognize that something with four bonds is tetrahedral, whereas something with four bonds and two lone pairs is square planar (due to electron repulsion). For hybridization you can count the regions of electron density. ...

Adriana_Bustamante_3L

The question is asking why the lewis structure is wrong. So here, it is not allowed to violate the octet rule the way it does because it has an odd number of electrons around the central atom. Cl can, however violate the octet rule, by having an expanded octet, but that isn't the case here.

Adriana_Bustamante_3L

Yes. So, for example, if you have something like [ICl_2]+ , you should have two neutral chlorines singly bonded to an Iodine that is missing 1 electron, which makes the overall charge positive.

Adriana_Bustamante_3L

Why is it that HCl is more ionic in character than HI ?
I would think that the electronegativity difference between H and I is greater than H and Cl, which would make HI more ionic in character than HCl.

Adriana_Bustamante_3L

Is there a reason why the lewis structure for XeF_2 is drawn vertically rather than horizontally?

Adriana_Bustamante_3L

So: 339.20g Co metal is reacted with compressed F gas to produce a compound with a mass of 996.08g. What is the empirical formula of the new compound? (Atomic Masses: Co (58.93g/mol) F (19.00g/mol) ). I have absolutely no idea what to do first/ how to find the masses that are needed to convert to mo...

Adriana_Bustamante_3L

So, as you move down a group, the shielding effect increases which likewise increases the repulsion between electrons. Going down a group also places electrons in higher energy levels that are further away from the nucleus. With these two factors in mind, the effective nuclear charge is much lower o...

Adriana_Bustamante_3L

The question in the book asks: The frequency of violet light is 7.1x10^14Hz. What is the wavelength (in nanometers) of the violet light? So here's what I did: I used the equation λ = c / ν to find wavelength in meters which was 4.2x10^-7 . I'm having trouble converting to nanometers. Where the solut...

CHEMISTRY COMMUNITY

Search found 21 matches

Ozone as an oxidizing agent [ENDORSED]

Re: Molar Heat Capacities

Calculating the change in entropy of the surroundings

reaction enthalpy

Making a battery

Re: Transition States

Transition States

Parent chain -ENE numbering

Positively charged Carbon

Re: Adding equations to get a final equation (deltaH)

Adding equations to get a final equation (deltaH)

Re: Compression

Compression

Re: Lone Pair/Unpaired Electron

Re: explanation for ClO2 lewis structure (problem 67b)

Re: Formal charge

Ionic character and electronegativity

Lewis Structure XeF_2

Empirical formula with Co and F

Re: Electron Affininty

HW 1.7A