CHEMISTRY COMMUNITY

Delour Haj 3J

Is there ever a time when one should take the coefficient that is in front of a reactant in an equation, and use it as an exponent for that reactant in the equation's rate law? Is there a rule regarding taking the coefficients and using them as the exponent as well?

Delour Haj 3J

Want to hear a joke about Sodium Hypobromite?
NaBrO.

Delour Haj 3J

During lecture on Friday, under the section of naming cycloalkanes, I was confused as to how the numbering of the carbons occurred in the case where there are 2 substituents on a ring. How does one decide when to start numbering off the carbons? I understand that it starts at a substituent molecule,...

Delour Haj 3J

The optimist sees the glass half full. The pessimist sees the glass half empty. The chemist sees the glass completely full, half with liquid and half with air.

Delour Haj 3J

Chemistry is like cooking- just don't lick the spoon!

Delour Haj 3J

In this question, the solutions say that the number of orientations for BH2F is 3, but I am unsure as to how this value was gotten. How does one figure out the orientations of the molecule to use that value in calculating the residual entropy?

Delour Haj 3J

How does one know when to add H+ into a cell diagram? What should we look for when writing a cell diagram to tell us what to put in it other than the species involved in the reaction?

Delour Haj 3J

In problems in the homework, when there is calculations for the enthalpy of a reaction and the calculation for Gibb's Free energy, the molecule O2 was not included in the calculation, however, in the entropy calculations, I noticed that O2 is included. Is this because it is a diatomic molecule? Why ...

Delour Haj 3J

Why did the white bear dissolve in water?
Because it was polar.

Delour Haj 3J

I understand the equation for calculating degeneracy is W=2^N, however, in which cases will this equation be used? What exactly is W signifying and telling us?

Delour Haj 3J

In this example, the reaction is Br2(l) + CH3CH=Ch2(g) --> CH3CHBrCH2Br(l). I am confused as to how in the textbook, they say that two reactant bonds are broken, specifically the Br2 and double bond in CH3CH=Ch2, and three bonds are formed in the product, C-C and two C-Br. However, when I drew out t...

Delour Haj 3J

How do you distinguish the stoichiometric point, the halfway stoichiometric point, and the pKa value from looking at a titration graph? Also, how do you know from a titration graph what two things are being reacted (strong base/strong acid, strong base/weak acid, strong acid/weak base, weak acid/wea...

Delour Haj 3J

In my notes, I have written that Ka1>Ka2>Ka3... as it is harder to lose H+ from a negatively charged ion, as they are more stable. However, I do not understand what Ka2 and Ka3 and so on are, Ka1 would be found by taking the initial products and reactants in an equation, but what changes in the equa...

Delour Haj 3J

What is the effect of an increase in pressure, and an increase in expansion on an equilibrium equation with more moles of reactant on the left side of the equation as compared to moles of product? Why is this the case?

Delour Haj 3J

What is the correct order to fill an M.O. diagram for atoms with total electrons less that 8 and more than 8? Also, if there is a homonuclear compound, then the M.O. is symmetric on both sides, and you would follow the order to fill as given, but what changes when it is a heteronuclear compound, and...

Delour Haj 3J

In molecules where the Lewis structure is three elements put together, how do we know whether the molecular shape for those molecules is linear or bent? For instance, ClO2+ has a structure with Cl being the center atom with a lone pair and two Oxygens double bonding to it, how can one know why it ha...

Delour Haj 3J

What exactly is an antibonding orbital, and how exactly does a molecular orbital energy level diagram show how an antibonding orbital has less energy than a bonding orbital? Also, what is the purpose of figuring out the bond order, is it just to know how many bonds are made in a molecule?

Delour Haj 3J

What exactly is electron distortion, and how does this lead to ionic bonds having covalent bond characteristics? What does it mean when an ion has a high distortion, and thus has a high polarizing power, and how are these concepts related to the fact that ionic bonds have slightly covalent character...

Delour Haj 3J

Looking over my notes, I noticed and remembered from lecture that there are exceptions to the octet rule. I understood the exception for Hydrogen, Helium, Lithium, and Beryllium, but am confused for the exception regarding those in the third period (and especially how they can have more than 8 valen...

Delour Haj 3J

In the lecture, the concept of assigning spin (positive or negative) to states of atoms was discussed. However, it is still unclear to me how to actually write in the spin orientation for different states. I do not know, for instance, how to take a Neon atom, and analyze its states and assign the el...

Delour Haj 3J

In my notes from today's lecture, I wrote a statement that says: the energy of light that is absorbed or emitted matches the energy difference of an electron moving from one principal quantum level to the other. Can someone clarify and further explain this concept? Does this mean that the energy tha...

CHEMISTRY COMMUNITY

Search found 21 matches

Coefficients in rate laws

Re: Post All Chemistry Jokes Here

Selecting the name with the lowest number

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Midterm 2012 Question 3A

Cell Diagram

Why O2 is not counted in Enthalpy and Gibb's Free Energy Calculations [ENDORSED]

Re: Post All Chemistry Jokes Here

Calculating Degeneracy

Example 8.13 in Textbook

Stoichiometric Point, Halfway Stoichiometric Point from graph

Ka1,2,3... Significance

Pressure/Expansion effect on products and reactants

Order of Filling and Removing Electrons in M.O. Diagrams

Linear vs. Bent Molecular Shape

Bond Order and Antibonding Orbitals

Electron Distortion and Chemical Bonds

The Octet Rule (and exceptions)

Assigning Spin to States

Energy Absorption and Emission for Electrons