CHEMISTRY COMMUNITY

Liam Maxwell 2E

Q: Why do chemists like nitrates so much? A: They're cheaper than day rates.

Liam Maxwell 2E

Q: Why do chemists call helium, curium, and barium the healing elements? A: Because if you can't helium or curium, you barium!

Liam Maxwell 2E

Q: What do you call Iron blowing in the wind? A: Febreeze.

Liam Maxwell 2E

Physical chemistry: the pitiful attempt to apply y=mx+b to everything in the universe

Liam Maxwell 2E

Why do chemistry professors like to teach about ammonia?
Because it's basic material.

Liam Maxwell 2E

Heisenberg is out for a drive when he's stopped by a traffic cop.
The cop says: " Do you know how fast you were going?"
Heisenberg replies: "No, but I know where I am".

Liam Maxwell 2E

In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.

When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate determining step”.

Liam Maxwell 2E

could someone explain why the slowest step in a rate reaction determines the overall rate of the reaction. thanks!

Liam Maxwell 2E

I was wondering which rate order correlates to the fastest rate, or is there no correlation. For example is a reaction that is first order always faster/slower than a rate at second order if all other variables remain the same?

Liam Maxwell 2E

I had a similar problem when calculating this problem I got n=2 because the balanced equation is H2=2H+ +2e but the solution manual said n=1

Liam Maxwell 2E

Also why in the solutions manual does it have AgBr before Br- in the galvanic cell. I thought since it was an anode Br- should go first since it has more electrons and is thus oxidized

Liam Maxwell 2E

Also why in the solutions manual does it have AgBr before Br- in the galvanic cell. I thought since it was an anode Br- should go first since it has more electrons and is thus oxidized

Liam Maxwell 2E

Two men walk into a restaurant. The First man orders, "I'd like H2O". The second man orders, "I'd like H2O too". The second man died.

Liam Maxwell 2E

Why was the electrochemical cell arrested?

Because he was convicted of battery.

Liam Maxwell 2E

Those are the formulas for constant volume, if asked for constant pressure add R to those values. This would give you Cp(monatomic)=5/2R and Cp(diatomic)=7/2R

Liam Maxwell 2E

This is somewhat of a broad question that I am not entirely sure how to phrase correctly. In some instances with calculations involving reactions it is necessary to include when a solid or liquid changes to a gas if the product it forms is also a gas, but sometimes you don't. When do you know when t...

Liam Maxwell 2E

Why is it that when there is an isothermal expanison, and thus deltaT=0, that deltaU also equals 0?

Liam Maxwell 2E

Is calculating G the only way to officially conclude spontaneity? Because based on the equation calculating merely entropy or enthalpy doesn't appear to be enough.

Liam Maxwell 2E

the question asks you to estimate the temperature at which it is thermodynamically possible for a reaction to occur. In the explanation it says when temp is increased there is a point where T= standardH/standardS. However in order for this to be true following the equation StandardG=StandardH-Tstand...

Liam Maxwell 2E

The book says that the higher the temperature the less positive the Gibbs free energy, but isn't that not 100% correct? Looking at the formula G=H-TS if H is positive and S is negative then a higher temperature would actually result in a higher value of G

Liam Maxwell 2E

Can someone explain what the textbook means when it says the standard Gibbs free energy of reaction is the difference between pure products and reactants, and therefore doesn't change over the course of a reaction as opposed to Gibbs free energy of reaction which does change over the course of a rea...

Liam Maxwell 2E

The example asks you to find the change in entropy when a gas is heated at a constant volume. You have to use the equation deltaS=C ln(T2/T1), but I was wondering why you don't have to account for a change in pressure... or is there no change in pressure?

Liam Maxwell 2E

is that because you have to cube the decimeter? because I am still confused as why everywhere I look online it says 1L=.001 cubic meters

Liam Maxwell 2E

I know the names of the endothermic phase changes (vaporization fusion and sublimation), but what are the names of their exothermic counterparts?

Liam Maxwell 2E

On the equations and constants sheet it says 1L=1dm^3 does the d mean deci?, because when I googled it it said 1L=.001 cubic meters.

Liam Maxwell 2E

In a review session we were going over things that were and were not state functions. What came up was q and w were not state functions. I understand work but could someone give an example as to why heat isn't a state function.

Liam Maxwell 2E

Can someone explain what the negative sign means on this equation?

Liam Maxwell 2E

Do we need to memorize the molar heat capacities of monatomic ideal gasses, specifically the values given for atoms, linear molecules and nonlinear molecules?

Liam Maxwell 2E

I am extremely confused on how to approach this problem. Can someone please explain to me what clue in the problem allowed them to realize they had to write combustion equations for the individual components of the given equation.

Liam Maxwell 2E

What exactly is enthalpy? I know that it is extremely important in thermochemistry but I am still a little shaky as to what it exactly is.

Liam Maxwell 2E

what actually constitutes the difference between an open and closed system?

Liam Maxwell 2E

Why do gasses have two different values for the molar heat capacity as opposed to solids and liquids only having one?

Liam Maxwell 2E

A little off topic but don't forget Copper and Chromium are exceptions for electron configuration

Liam Maxwell 2E

I think what you are referring to is the oxidation state. In which case you look at the charge of all the individual items attached to the metal. For example Cl has a -1 charge. Then you look at the overall charge of the compound. The oxidation state is the number that allows for the individual comp...

Liam Maxwell 2E

I am unsure of the coordination compound but the transition metal is iron

Liam Maxwell 2E

If you apply two double bonds none of the atoms will have a charge since sulfur can have two unpaired electrons due to its expanded octet

Liam Maxwell 2E

I was also unsure of this problem. If it weren't stated in the problem would there be any way to infer these compounds are ionic?

Liam Maxwell 2E

I am confused about part b. It is asking for the conjugate acid of NH2NH2. Both nitrogens have a lone pair, so could the hydrogen from H2O attach to either one?

Liam Maxwell 2E

4.81 is asking for the Lewis structure of the borazine (B3N3H6). the boron and nitrogen molecules alternate to form a hexagon core where each one is also attached to one hydrogen. In the solutions manual it has a double bond for every other bond in the hexagon. However, this means the nitrogen have ...

Liam Maxwell 2E

Why exactly aren't solids and liquids included in the equation to determine K. I vaguely remember in lecture Professor Lavelle touched on the point that they don't change in concentration, but what does that have to do with them being omitted from the equation.

Liam Maxwell 2E

If a ligand can function both as a polydentate and a monodenate, when naming it would you use the greek prefixes (bis, tris, etc.)?

Liam Maxwell 2E

A photon checks into a hotel. The manager at the front desks asks if he will be needing any help with luggage. The photon replies "no thank you I'm traveling light."

Liam Maxwell 2E

I'm not sure if this helps that much but when determining the shape of a molecule it is helpful to first plot out its electron arrangement to serve as a starting point. From the electron arrangement you can infer the shape.

Liam Maxwell 2E

yes that is correct. I was a little confused with this problem as well. Originally I put Br->Cl->N3->O2 because I thought this described the trend of largest anion radius to smallest. Why are does oxygen go before nitrogen?

Liam Maxwell 2E

This textbook question asks for trends in electropositivity for the first two groups of the periodic table. In the solutions manual it gives a list of the elements in order of increasing electropositivity. Within the list it states that Beryllium is more electropositive (more willing to give up elec...

Liam Maxwell 2E

Q: What is the name of 007's Eskimo cousin?
A: Polar Bond.

Liam Maxwell 2E

Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.

Liam Maxwell 2E

I am having a little trouble imagining what exactly happens to an electron when it is excited and moves up an energy level. An electron revolves around the nucleus in somewhat of an unpredictable way so when it is excited where exactly does it go? Does it move farther away from the nucleus?

Liam Maxwell 2E

I enrolled into the class late and was never formally emailed the password to the website. Someone had given it to me but I seem to have forgot it. Is there any way someone could send it to me?

Liam Maxwell 2E

In figure 1.19 on page 15 of the textbook an illustration depicting an experiment is shown. Waves of electromagnetic radiation are shot at a screen and pass through a pair of closely spaced slits, and as a result circular waves are generated on the other side of the screen. This figure is used to de...

Liam Maxwell 2E

Hello everyone,

I know lambda is what is used to represent wavelength however in Wien's law it represents intensity. To my knowledge these are completely different things, so is lambda used to represent both, or is intensity and wavelength related?

Liam Maxwell 2E

On the test on 10/6/17, I had trouble allotting enough time to answer all the questions and I believe it was mostly as a result of me taking my time thinking about what significant figures I should be using throughout my intermittent calculations. Are significant figures a crucial part to the test ...

Liam Maxwell 2E

This is sort of a general question more about the course, but does anyone know when the cycle for the two posts on chemistry community resets in terms of getting points?

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