CHEMISTRY COMMUNITY

Alondra Loera 1A

How do we determine the hybridization of organic molecules? By the shape? In the fall 2011 Final, Question 6C, the Nitrigen atom seems to be triton all planar but the hybridization is sp3 not sp2

Alondra Loera 1A

There is a note in the course reader that says He2 is unstable, why is this?
When I completed the molecular orbital diagram all the orbitals are filled and it is diamagnetic.

Alondra Loera 1A

If we are given that the temperature is 100 degrees celsius should our answer only have 1 significant figure or do the significant figures of temperature not matter when trying to figure out how many significant figures our answer should have?

Alondra Loera 1A

If a molecular structure has dipole charges that do not cancel each other out does that mean that it is polar?

Alondra Loera 1A

Significant figures are the number of digits in an answer relative to the numbers in the problem. 11.2 has 3 significant figures 11.20 has 4 significant figures 0.011 has 2 significant figures with decimals, the significant figures are counted after the first integer so for 0.011, 1 and anything aft...

Alondra Loera 1A

Since molarity is the moles of solute per liter of solution it does not matter if she used moles in the ICE chart as long as long as the unit of moles is consistently used and at the end the number of moles is divided by the volume to get the molarity/concentration of the solutions at equilibrium

Alondra Loera 1A

Can somebody explain how to get the electron configuration of molecular orbitals and how this relates to typical electron configuration?

Alondra Loera 1A

When filling out an ICE chart can moles be used instead of molarity for the concentration, if we calculate the molarity at the end? I saw a video in which moles was used instead of molarity and am not sure if this was actually just an error.

Alondra Loera 1A

This is an overview on filling out and ICE chart. I - Initial Concentration C - Change in Concentration E - Equilibrium Concentration For I - All the known concentrations should be filled in, for the products it will typically be 0 because no products have been formed. Many equilibrium problems give...

Alondra Loera 1A

So this is kind of an overview when filling out an ICE chart with X ... Note that the equation will shift in only one direction. Then indicate an amount, x, that it shifts and write the stoichiometric coefficient in front of x and put a minus sign in front of any species for which the concentration ...

Alondra Loera 1A

This was very helpful, thank you for breaking down the different parts of the equation and the steps in the problem.

Alondra Loera 1A

To determine the steric number of an atom, first count the number of bonds to that element; secondly count the number of lone pairs of electrons. Add the two numbers, and the result is the steric number. For ex: the O in water H2O has a steric number of 4: 2-H atoms and 2-lone pairs.NH3 also has a s...

Alondra Loera 1A

Just to clarify photons are wave particles and according to special relativity, light is constantly traveling with speed c. Therefore photons are never at rest and do not have a rest mass but because they have energy they do have a mass. Particles such as electrons and protons do have a rest mass .

Alondra Loera 1A

Yes you're right! Lone pairs e- are very repulsive (even more than bonded e-) they also have a very large effect on the actual shape of the molecule. For ex. If there are lone pairs of e- around the central atom, the bonds around the central atom will be repulsed and will move away...so the bond ang...

Alondra Loera 1A

I think this is most of them, hope this helps. Also do not forget -ous is -ic when there are more protons.
Cuprous ion Cu+

Ferrous ion Fe2+

Mercuric ion Hg2+

Plumbous ion Pb2+

Stannous ion Sn2+

Chromous ion Cr2+

Manganous ion Mn2+

Cobaltous ion Co2+

Alondra Loera 1A

Do as you typically would so, for example, if you are given the following numbers 544.60 6.005 0.00343 Multiplying or dividing using these numbers results in three sig. figs because 544.60 --> 5 sig.figs 6.005 --> 4 sig.figs 0.00343 --> 3 sig.figs Your answer would have to be XX.X % with only 3 sig....

Alondra Loera 1A

Personally limiting reagents is a concept I have struggle to understand but I think I have finally understood it and I hope this helps anybody still struggling with this. The limiting reagent is a reactant that determines the amount of product produced, it is also necessary in determining the final ...

Alondra Loera 1A

Just like the pH, the pKa tells you of the acid or basic properties of a substance. pKa <2 means strong acid pKa >2 but <7 means weak acid pKa >7 but <10 means weak base pKa >10 means strong base pKa1 is when an acid can undergo more than 1 ionization the pka1 is the disassociation constant for the ...

Alondra Loera 1A

I would use either the number of sig. figs. in the constant used or round to the thousandth decimal because it is better to be precise.

Alondra Loera 1A

A question can also be asked regarding how to reach the end point of titration and you could answer this by reasoning that the final point is greater than the volume of the titrant at stoich. and that the point would have to be at the flat are of the curve to because stoich. has been reached. You mi...

CHEMISTRY COMMUNITY

Search found 20 matches

Organic [ENDORSED]

He2

Temperature [ENDORSED]

Dipole and Polarity [ENDORSED]

Re: Significant figures [ENDORSED]

Re: Finding Chemical Equilibrium Concentrations

Electron Configuration

Moles or molarity in an ICE chart

HOW TO: ICE CHARTS

Re: ICE charts

Re: Video: DeBroglie Equation

Re: steric number

Re: Kinetic Energy 1.23 c

Re: Clarification of lone pairs

Re: latin names

Re: Percentages Sig Figs? [ENDORSED]

Limiting Reactants Explained

Re: pKa v. pKa1 and pKa2

Re: Sig Figs in Quantum Questions

Re: Titrations