CHEMISTRY COMMUNITY

Anmol Dhaliwal 2C

For those, look at the main chain of the carbons, then where the double bond is in the structure. Look at the two biggest molecules on the bond and identify if they are both going in the same direction (up or down). If they are, it would be a cis structure. If the two biggest molecules on the bond a...

Anmol Dhaliwal 2C

I believe the #s would be written separately because they are different halides and this way they would not be confused with each other in the naming (even if they are on the same carbon).

Anmol Dhaliwal 2C

You would get the longest chain for that is a hexane and then there are two methyl substituents (the ones at the top branching off). I believe that is what is giving it the name 2,3-dimethlyhexane because you are trying to get the biggest counting chain meaning if you count the branch off of the 2nd...

Anmol Dhaliwal 2C

I believe since the reading was assigned, it is possible that we will get questioned on this but probably not completely in depth. As you mentioned, it will probably only be because its relation to the Arrhenius equation. I am pretty sure material assigned in readings but not completely covered in c...

Anmol Dhaliwal 2C

Q: Why do chemistry students do well when working with ammonia?
A: Because it's pretty basic stuff.

Anmol Dhaliwal 2C

You can use both equations for any situation in which you can use the Nernst equation. They should both get you the same answer. It is just a matter of preference and log is usually used when the numbers given for concentrations is to the 10s (.1 or .001) because it is easier to find the log of such...

Anmol Dhaliwal 2C

Both ln and log can be used for the Nernst equation but log is used over ln for simplicity. Using ln instead of log should give you the same answer. In that specific problem, I believe they used log because it is just an alternate form of the same equation but usually log is used in place of ln when...

Anmol Dhaliwal 2C

Q: What did the cell need when it was dying and could not breathe?

A: Cellular respiration!

Anmol Dhaliwal 2C

In the back of the course reader, I noticed that the prep quizzes don't have the answers. Is there an answer key for them so we can check our answers?

Anmol Dhaliwal 2C

Most of the common unit conversions are on the back of the periodic table given to us (the laminated one with the course reader) and for the quizzes so if it is on the back of the laminated periodic table, it is on the periodic table we get during the quizzes. I'm pretty sure we will be told if ther...

Anmol Dhaliwal 2C

Can someone explain why in the solutions manual, 50g is added twice when trying to find the heat of the ice cube (once when converted into moles and then again when multiplied to numbers 4.184 J*C^(-1)*g^(-1)?

Anmol Dhaliwal 2C

The phase state of the system does affect whether work is done on/by the system, such as in a) work is done by the system because there is expansion from a solid to a liquid (liquids are more dispersed in a sense and therefore there is expansion). It is also okay to assume that w is positive when wo...

Anmol Dhaliwal 2C

You start from the valence orbital of the electron configuration because you are only counting in the valence electrons when using the MO theory. For instance, for C (carbon) you would start at 2s because it is in period 2 of the periodic table and then increase to 2p from there. Hope this helps!

Anmol Dhaliwal 2C

It would be worded usually from negative to positive. I don't believe it technically matters which order you put it in, but generally the rule for L is -L to postive L so it would be better to word it from negative to positive values of the L.

Anmol Dhaliwal 2C

I'm pretty sure that means to derive a formula such as the formula for Henderson Hasselbalch. So we will not have to know how to derive that formula or any formulas such as that.

Anmol Dhaliwal 2C

The Ka and Kb values are going to be given in the problem when you solve it so we don't need to know them. We won't need to know any of them offhand.

Anmol Dhaliwal 2C

The stoichiometric point is below the ph of 7 because acids have a pH lower than 7. If you add a weak base and a strong acid, the acid has a stronger affect on the stoichiometric point therefore lowering the pH below 7. Basically, after you mix the strong acid and weak base together, the solution is...

Anmol Dhaliwal 2C

The weaker bases have a smaller Kb which makes them have a greater pKb (this is the same for Ka and pKa). That means, the smaller the pKb is, the bigger the Kb is and therefore it would be a stronger base. For instance, methylamine has a Kb of 3.6x10^-4 and the pKb is 3.44 (low) which makes it more ...

Anmol Dhaliwal 2C

For question 12.9b it asks which reactions can be classified as reactions between Bronsted acids and bases and to identify the acid and base for the ones that can. part b has the equation NH4I (s) ----> NH3 (g)+ HI (g) and in the solutions manual it lists NH4+ as the acid and I- as the base. Can som...

Anmol Dhaliwal 2C

Q: What do you call a very small piece of iron?
A: A FEtus!

Anmol Dhaliwal 2C

Could someone please explain part b) of the question? In the solutions manual it says [OH-]=[H3O+], that is because the temperature of both are the same in the question yes?

Anmol Dhaliwal 2C

Can someone please explain how to name compounds (with an example) that would include the bis-, tris-, or tetrakis-? I don't really understand when that would apply to a complex. Also for the charges, does the overall charge of a complex have any affect on the oxidation number put in the name of the...

Anmol Dhaliwal 2C

In the structure, there is 2 Nitrogens and each have 3 bonds connected to it but Nitrogen's valence electrons is 5 not 3 so it would take a lone pair for both Nitrogens to fill their valence electrons (Thats 2 lone pairs). The 2 Oxygens connected only have 2 electrons connected to each and the valen...

Anmol Dhaliwal 2C

You use frequency= speed of light/wavelength for 350 nm and 425 nm and solve for frequency and then multiply each frequency by planck's constant (E=hv) (you get v= 7.058x10^14 for 425 nm and multiply by planck's to get 4.67x10^-19 J and you get v=8.57x10^14 for 350 nm and multiply by planck's to get...

Anmol Dhaliwal 2C

I live in C1! I'd love to come!

CHEMISTRY COMMUNITY

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Re: Z and E how to tell the difference

Re: 2.16

Re: Self-Test 1.3A [ENDORSED]

Re: Collision Theory & Transition State Theory

Re: Post All Chemistry Jokes Here

Re: Nernst Equation Versions [ENDORSED]

Re: Nernst Equation (ln vs log) [ENDORSED]

Re: Post All Chemistry Jokes Here

Quiz Preparation

Re: Unit conversions

Homework Problem 8.41

Re: Expansion work done by/on the system - Problem 8.17

Re: molecular orbital electron configuration [ENDORSED]

Re: Finding the "Highest L value for the e-" [ENDORSED]

Re: Derivations [ENDORSED]

Re: Common Acids and Bases

Re: weakbase-strong acid question

Re: pKb and pKa

Question 12.9b

Re: Post All Chemistry Jokes Here

Question 12.23

Naming Complexes

Re: Fall 2015 Practice Midterm

Re: Quiz 1, Question 5

Re: MIDTERM REVIEW IN SUNSET VILLAGE