CHEMISTRY COMMUNITY

Sophia Eliopulos 2I

NO would have a higher residual entropy than BF3 because if you look at it, BF3 can have the fluorine atoms in 3 different places, but essentially they are the same molecule. However, flipping the N and O position across the double bond gives 2 different orientations which is why NO has higher resid...

Sophia Eliopulos 2I

I believe the -a- is simply there to make the name easier to say versus having two consonants together.

Sophia Eliopulos 2I

It is 4-ethyl,2,2-Dimethyl-hexane instead of 3-ethyl, 5,5-dimethyl-hexane because you always want the lowest possible number you can have. 2 is lower than 3 and 5 so this is why you would name it this way.

Sophia Eliopulos 2I

Yes, a catalyst can be included in a rate law. That's because, most reactions occur in a series of step and the rate is based on the "rate determining step", which is the slowest step. A catalyst may be a reactant in the rate determining step, and a product in a subsequent step. Therefore,...

Sophia Eliopulos 2I

Catalysts work by providing an alternative reaction pathway for the breaking and remaking of bonds. The activation energy for this new pathway is often less than the activation energy of the normal pathway. When a catalyst is present, one of the reactants reacts with the catalyst to form an intermed...

Sophia Eliopulos 2I

Many electrode reactions involve only ionic species, which typically consist of aqueous and gas. If neither of the electroactive species is a metal, some other metal must serve as a conduit for the supply or removal of electrons from the system; platinum is commonly used.

Sophia Eliopulos 2I

Hi!
It is also very important to remember the third law of thermodynamics which states that the entropies of all perfect crystals approach zero as the absolute temperature approaches zero (0 Kelvin). So, keeping this in mind, we also should look at the temperature these molecules are at.

Sophia Eliopulos 2I

If the reaction is isothermal then delta U (change in internal energy) is zero and because delta U= q + w, --> q= w. A reversible process has the same external and internal pressure while in an irreversible process, the internal and external pressure are different.

Sophia Eliopulos 2I

Heat capacity increases with molecular complexity because as more atoms are in the molecule, there are more possible bond variations that can absorb the added energy.

Sophia Eliopulos 2I

Getting in the spirit of chem...

Sophia Eliopulos 2I

It is probably a good idea to remember that indicators are weak acids that give a strong color change with pH. The popular indicator phenolphthalein in acid appears colorless, however in base appears pink. The H+ release results in a structural change so light is absorbed differently. The color chan...

Sophia Eliopulos 2I

Hopefully this can help! Kp and Kc are not the same because Kc refers to concentration while Kp refers to partial pressure.

Sophia Eliopulos 2I

pOH = -log[OH-]

the negative log of the hydroxide ion molarity

pKw = -log Kw

the negative log of the water ion product , Kw

pKa = -log Ka

the negative log of the acid dissociation constant, Ka

pKb = -log Kb

the negative log of the base dissociation constant, Kb

Sophia Eliopulos 2I

I would imagine we need to know how to draw heteronuclear molecular orbitals for the quiz, but we have to know how to draw it for the final anyways. Basically use the same outline for MO as homonuclear molecular orbitals with Z<8, except the more electronegative element has a lower energy level.

Sophia Eliopulos 2I

Saw this one coming...

Sophia Eliopulos 2I

Bonding: constructive interference; in-phase; orbital overlap; molecular stability & lower energy. Sigma has head to head overlap while pi bonds along a parallel plane or axis
Anti-Bonding: destructive interference; out-of-phase; no orbital overlap; molecular instability & higher energy.

Sophia Eliopulos 2I

cackled out loud when I saw this

Sophia Eliopulos 2I

Two exceptions to the octet rule are hydrogen and helium, which both have room for only two electrons in their valence shell. Because they both only have one shell, the first shell has only one s orbital and no p orbital, so it holds only two electrons (which is when helium and hydrogen are most sta...

Sophia Eliopulos 2I

It helps with practice, but basically you can tell which state it is in by the levels which are filled in an electron configuration. When in an excited state, the electrons "jump" to a higher level, which is not normally found in the ground state configuration of the atom. This jump causes...

Sophia Eliopulos 2I

I think its more a conceptual aspect. So if an electron is excited to a higher energy level, it can still exist in the same orbital as it was before (1s/2s), but now it also has the possibility of occupying a different orbital (2s/3p).

Sophia Eliopulos 2I

What would we do if we were given a problem that had addition or subtraction and multiplication or division in the same question? Are we supposed to do sig figs at each step as we work through the problem or do we just wait until the end?

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Higher Residual Entropy

Re: Naming alkenes [ENDORSED]

Re: Naming

Re: catalyst

Re: Catalyst

Re: Cell Diagrams

Re: Higher Entropy

Re: non isothermal processes

Re: Cpm vs Cvm [ENDORSED]

Re: Post All Chemistry Jokes Here

Re: Indicators

Re: Kp and Kc Same?

Re: pH and pOH

Re: Question regarding heteronuclear molecular orbitals

Re: Post All Chemistry Jokes Here

Re: Bonding vs. Anti-bonding

Re: Post All Chemistry Jokes Here

Re: Ionic Bonds of Octet Outliers

Re: Building-Up Principle [ENDORSED]

Re: Energy Level Changes in Orbitals

Sig Figs in a problem with addition & multiplication [ENDORSED]