CHEMISTRY COMMUNITY

Julia_Gordon_2A

But will we have to know it if they both appear on the same structure?

Julia_Gordon_2A

Are we going to have to know how to name a structure with both a double and triple bond?

Julia_Gordon_2A

The problem asks to solve for the delta Hvap given a mass of 255 g, an initial temperature of 25 C a boiling point of 47 C, heat capacity of 5.4x10^-3 kJ/C/g and a q of 375 kJ. The problem says that have the mass boils away. The solution said that q=m*C*deltaT + (1/2)m*deltaHvap Why do we set up the...

Julia_Gordon_2A

When naming compounds with a functional group, say alcohol for example, do we start numbering at the site of the functional group since it gets highest priority?

Julia_Gordon_2A

When there are more than 2 substituents on a ring, should the bigger substituent be placed on the lowest number on the main chain?

Julia_Gordon_2A

On the bottom of page 6 in the organic textbook is the example of the structure of 3-Ethyl-3,5-dimethylheptane. I know that we are supposed to identify the longest chain as the root of the name, in this case heptane. However, how do we know that the second half of the chain (4,5,6,7 C) is not a subs...

Julia_Gordon_2A

In the course reader it gives a chart with the first 10 hydrocarbons, the name of the corresponding alkane and its formula. It also gives the name of the alkyl group and its corresponding formula. Could someone please clarify as to what an alkyl group is?
Thanks!

Julia_Gordon_2A

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.

Julia_Gordon_2A

But this would mean that Ecell=0.22-0.80=-0.58V

Why is the negative value accepted in this case?

Julia_Gordon_2A

In the textbook example 14.8 on page 586, the question asks to calculate the equilibrium constant at 25 degrees C for AgCl(s)--->Ag+(aq)+Cl-(aq). The two half reactions that are required to use are R: AgCl(s) + e- ---->Ag(s) +Cl-(aq) E=+0.22V L: Ag+(aq) +e- -----Ag(s) E=+0.80V It says that the secon...

Julia_Gordon_2A

Zn(s) + Cu(2+)(aq)--->Zn(2+)+Cu(s)

In example 14.3 where we are told to calculate Gibbs Free Energy using -nFE, it says that n=2 mols. Could someone please explain where 2 mols came from?

Thank you!

Julia_Gordon_2A

Could someone please explain why we use Platinum as an inert conductor and how we know when to do so? Also, if Pt is included in the cell diagram, is it also included in the half reactions?
Thanks!

Julia_Gordon_2A

When calculating the delta H of a reaction from the delta H of formation values, are gases included in the calculation? In question 9.59, the solution shows the calculation but omits the value for O2.

Julia_Gordon_2A

Making bad chemistry jokes because all the good ones Argon

Julia_Gordon_2A

Q. "Barium metal is produced by the reaction of aluminum metal with barium oxide. From the standard reaction enthalpies, 2Ba(s) + O2(g)--->2BaO(s) dH=-1107 kJ 2Al(s) + O2(g)---->Al2O3(s) dH=-1676 kJ calculate the rxn enthalpy for the production of metallic barium in the rnx 3BaO(s)+2Al(s)--->Al...

Julia_Gordon_2A

Could someone please explain to me why the first and second equations in #8.61 are reversed? I know that the objective is to get certain compounds to cancel, but I am still slightly confused because I thought you wanted to get the equations to resemble the original?
Thanks!

Julia_Gordon_2A

Is the main difference between heat capacity and specific heat capacity the fact that specific heat increases the temperature of 1 g by 1 degree C and that heat capacity is simply the heat supplied divided by the change in temperature?

Julia_Gordon_2A

When do we need to use "bis" and "tris" etc in naming coordination compounds and how do they differ from "di" "tri" etc..?

Julia_Gordon_2A

Is there a specific way to identify compounds as strong/weak acids/bases or is it based on general memorization and familiarity?
Thanks!

Julia_Gordon_2A

It says the oxidation state for that complex ion is +2. And wouldn't NH3 have a neutral charge?

Julia_Gordon_2A

I am slightly confused on how to find the coordination number and oxidation state for complex ions. Could someone please explain how to find both of those values for
[Pt(CN)(NH3)3]+ ?

Thank you!

Julia_Gordon_2A

To a certain extent, I believe. You need to know the "PV=nRT" equation for sure. Otherwise, it is everything up to page 135 in the Course Reader. Anything that he directly covered I think are fair game.

Julia_Gordon_2A

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.

Julia_Gordon_2A

When S has 4 bonds in SF4, is it considered trigonal by pyramidal instead of tetrahedral because S can hold more than 8 electrons. I believe SF4 was considered seesaw; could someone please explain why? Thank you!

Julia_Gordon_2A

Is there a way to know how many resonance structures are possible for a given compound? On the quiz will we just be asked to draw a specific amount?
Thanks!

Julia_Gordon_2A

Could someone please clarify how to approach question 47? It asks, "For each of the following ground state atoms, predict the type of orbital (1s, 2p,3d,4f,etc) from which an electron will be removed to form the +1 ion. a.) Ge b.) Mn c.) Ba d.) Au. Does this just asking for me to write out the ...

Julia_Gordon_2A

How many moles are in a guacamole?

Avocado's number.

Julia_Gordon_2A

Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now.

Julia_Gordon_2A

Are there specific rules when balancing equations regarding the state of a compound? Do the rules vary when you have a solid versus an aqueous, gas or liquid compound? Or do the same general rules for balancing equations apply across the board? Thank you!

Julia_Gordon_2A

I'd be interested too! Want to meet around 4 or so?

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Naming Alkenes/Alkynes

Naming Alkenes/Alkynes

Winter 2014 Final Q1C

Naming compounds with functional groups [ENDORSED]

More than 2 substituents on ring

Naming Example in Organic Textbook

First 10 Hydrocarbons Chart

Re: Post All Chemistry Jokes Here

Re: Calculating K for reaction using half reactions [ENDORSED]

Calculating K for reaction using half reactions [ENDORSED]

Example 14.3-Gibbs Free Energy [ENDORSED]

Inert Conductors

Calculating delta H of a reaction

Re: Post All Chemistry Jokes Here

Hess Law Problem 8.55

Hess' Law Problem #8.61

Heat Capacity vs Specific Heat Capacity

Naming Coordination Compounds

Identifying Strong/Weak Acids/Bases

Re: Finding Coordination Number and Oxidation State [ENDORSED]

Finding Coordination Number and Oxidation State [ENDORSED]

Re: Quiz 3 [ENDORSED]

Re: Post All Chemistry Jokes Here

Shape for Sulfur Tetrafluoride

Number of Resonance Structures

Textbook Question #2.47 [ENDORSED]

Re: Post All Chemistry Jokes Here

Chemistry Jokes

Balancing Equations

Re: Chem 14A Delta Terrace Study Group!