CHEMISTRY COMMUNITY

alyssawhite1L

In an endothermic reaction, heat is absorbed and can therefore be thought of as basically a reactant. Therefore increasing the temp would cause the reaction to favor the products. Decreasing the temp would cause the rxn to favor the reactants. For exothermic reactions, heat is released. Therefore he...

alyssawhite1L

On the back of the Practice Midterm, I was not sure how to do question 2. Its a 2 step reaction that produces hydrogen from methane and water. I got the correct answer by solving for the limiting reactant (CH4) of the first reaction and using that to solve for the amount of H2 produced in the first ...

alyssawhite1L

The ligands should be in alpabetical order according to their names, ignoring the prefixes (bi, tri, tetra, etc.). HOWEVER, when you use the other prefixes, (Bis, tris, tetris, etc) you order those (and only those) in alphabetical order according to all the prefixes.

alyssawhite1L

They are meant to be in alphabetical order, ignoring the prefixes. However, I heard in a study session that you should take into account the prefixes bis, tris, etc in the alphabetical order. Is this true?

alyssawhite1L

it applies to dien and edta the same was as en because they all contain prefixes (di, tri, etc). However it would not apply to oxo because it does not have a prefix.

alyssawhite1L

are there any other elements where the latin name is different from the name we know, other than iron?

alyssawhite1L

so therefore a full set or full octet needs 4 pairs of electrons. so a full set could never contain a radical

alyssawhite1L

Its less that the radical goes to the least electronegative ion, and more that the MOST electronegative atom is going to attract the maximum amount of electrons possible, which for those that obey the octet is 8.

alyssawhite1L

There was a question that asked us to compare the bond lengths of different molecules. In part a it had us compare a single to double to triple bond. However, in part b, it had us compare a molecule that had 1 single bond and one double bond, and a molecule that had 2 single bonds and one double bon...

alyssawhite1L

How do you know which atom in a molecule will have the radical, for example like in ClO

alyssawhite1L

Or even better, what are the exceptions for EA and atomic radii?

alyssawhite1L

So to clarify, the group 15/16 exception only applies to the trends of IE, and not EA and Radii? Why is this?

alyssawhite1L

It would also be helpful if someone could explain why these exceptions exist for each trend it applies to

alyssawhite1L

In discussion, I became a bit confused about the exceptions to the trends the relative E.A, I.E, and radii as you move down and across the periodic table. For example, group 15 has a higher ionization level than group 16? Can someone please clarify if this exception applies to all 3 of these trends?

alyssawhite1L

This question is largely why Lavelle would prefer we use the equation E = -hR/n^2 and couple it with the equation ΔE=Efinal-Einitial. This way you never have to be concerned about whether or not to use the higher energy level. You only have to know which energy level it started at (initial) and whic...

alyssawhite1L

For the P-orbital, we use the subscripts x,y, and z. In class, he said something about how these only work if we explicitly define each level as x, y, and z. Does this mean we can use other symbols instead of these to define the different sets of electrons?

alyssawhite1L

In discussion, we talked about how each orbital shape is representative of probability. Can someone please explain what this means?

alyssawhite1L

In section 1.2, it states that "As a light ray passes an electron, its electric field pushes the electron first in one direction and then pulls in the opposite direction" creating the oscillating field shown in 1.7. My question is why would the electric field first push and then pull? Why ...

alyssawhite1L

I believe that that section is simply proposing a trick to facilitate counting sig figs when you are only dealing with numbers with decimal places, ex. .10 + .024 = .12. However when you are adding a whole number to a decimal, 12 + .123, you can use this rule, with your answer thus being rounded to ...

alyssawhite1L

Here is the problem: Aluminum metal reacts with chlorine gas to produce aluminum chloride. In one preparation, 255g of aluminum is placed in a container holding 535 g of chlorine gas. After reaction ceases, it is found that 300g of aluminum chloride has been produced. (a) Write the balanced equation...

CHEMISTRY COMMUNITY

Search found 20 matches

Re: Endothermic v. Exothermic Reactions

Re: Practice Test Fall 2017 [ENDORSED]

Re: 17.31 c and d confusion

Re: Order of Ligands

Re: Naming Complexes

Re: Iron v ferrate in coordination compound naming

Re: Radical Question

Re: Radical Question

Bond Lengths [ENDORSED]

Re: Radicals

Re: Exceptions to trends [ENDORSED]

Re: Exceptions to trends [ENDORSED]

Re: Exceptions to trends [ENDORSED]

Exceptions to trends [ENDORSED]

Re: Rydberg Equation [ENDORSED]

P-Orbital

Orbitals as Probability

Fig. 1.7 [ENDORSED]

Re: Sig Figs- Addition and Subtraction [ENDORSED]

M. 15 Fundamentals