CHEMISTRY COMMUNITY

Vivian Wang 3J

Axial bonds point up/down and are referred to accordingly. Equatorial bonds only point slightly up/down and are referred to accordingly. Start with the carbon to carbon bonds. Think of how those are arranged according to the conformations. For chair conformation of cyclohexane, "each carbon ato...

Vivian Wang 3J

The answer shows \Delta S to not equal 0. There is also change in volume. The changes in volume occurs for each gas. For Argon, from 7.60L to 12.90L, and for Neon, from 5.30L to 12.90L. Though the final volumes are the same, the initial volume of each gas is not, which must be considered when calcul...

Vivian Wang 3J

Vivian Wang 3J

A nucleophile (electron rich) is Lewis base, which means it is a reactant that provides a pair of electrons to form a new covalent bond. When the nucleophile donates a pair of electrons to a proton, it’s called a Brønsted base, or simply, “base”. An electrophile, or a Lewis acid, is a species that a...

Vivian Wang 3J

Increasing the concentration of B by the ratio $\frac{3.02}{1.25}$ (from experiments 2 and 3) increases the rate by $\left ( \frac{3.02}{1.25} \right )^{2}$ .

Therefore, the reaction is second order in B.

Vivian Wang 3J

Vivian Wang 3J

Periodic Table of Candy Elements

Vivian Wang 3J

\Delta G = 0 only when the system is at equilibrium. For a phase change, that means that the reaction is taking place under conditions at which the two phases are at equilibrium. For example, when liquid water freezes, the ice must be formed at 0 C\degree and 1 bar pressure, where the reactants and...

Vivian Wang 3J

A reversible process can be reversed because the conditions under which it is carried out are very controlled. For the piston example in the textbook (page 265), the pressure of the confined gas and the external pressure are matched to keep the system in thermodynamic equilibrium. At equilibrium, th...

Vivian Wang 3J

It is reasonable to say that the pressure is decreasing because the gas is expanding.

Vivian Wang 3J

This may or may not be helpful. It is already Saturday.

Good luck.

Vivian Wang 3J

Table 11.2 contains the K values for the following equations at 300 K: H 2 (g) + Cl 2 (g) <==> 2HCl (g) , K 1 = 4.0 x 10 31 = \frac{(P_{H_{2}})(P_{Cl_{2}})}{(P_{HCl})^{2}} 2BCl (g) <==> Br 2 (g) + Cl 2 (g) , K 2 = 377 = \frac{&#...

Vivian Wang 3J

Higher electronegativity means lower energy level. Removing an electron from oxygen would require less energy than removing an electron from nitrogen.

Vivian Wang 3J

I would make the molecular orbital for NO first, then just take away two from the orbitals. That is, make this first (NO): http://2012books.lardbucket.org/books/principles-of-general-chemistry-v1.0/section_13/79fe2d438dfbad163cc8119628add7e9.jpg And then just take away two electrons (one from π* 2px...

Vivian Wang 3J

The atoms will bond where there are unshared electron pairs. OH 2 is written that way because it is just more convenient to show that the H 2 O is oriented that direction in order to bond to the central atom. The central atom always attaches to the oxygen atom in H 2 O because that is where the unsh...

Vivian Wang 3J

No, at office hours, he said you do not need to draw the ethylenes. Just draw a line connecting the nitrogens to represent the spacers.

Vivian Wang 3J

Hello! Here is the electron configuration of Cu: [Ar] 3d10 4s1. Then, the ion has a 2+ charge so two electrons are removed. One is taken from the 4s sub-shell, the other from the 3d sub-shell. So the electron configuration of Cu2+ is: 1s2 2s2 2p6 3s2 3p6 3d9. The noble gas electron configuration is...

Vivian Wang 3J

What would Cu^2- look like?

Electron configuration of Cu: [Ar]3d¹⁰4s¹

Vivian Wang 3J

"Ionic and covalent character represent points along a continuum."

Based on this statement, we can assume that as ionic character of a bond increases, covalent character of the same bond decreases.
And, as covalent character of a bond increases, ionic character of that bond decreases.

Vivian Wang 3J

Ionic and covalent character describe the nature of the bond between atoms. For example, a molecule with a higher ionic character than covalent character means that the atoms have more of a give-and-take relationship for the electrons that bond them. If the bond were described to have higher covalen...

Vivian Wang 3J

Only the material on the quiz to be handed in will be more reflective of the actual quiz. Previous years' has stuff we haven't covered yet and will not be on the upcoming quiz.

Vivian Wang 3J

http://bio1151.nicerweb.com/Locked/media/ch02/02_13IonicBonding.jpg Since Na wants to lose that electron to make an octet, it will, becoming Na+. Cl gains an electron with the bond, becoming Cl-. It is the ionic bonding that causes them to change in atomic radius. If we were considering Na and Cl s...

Vivian Wang 3J

Chromium, Cr
[Ar] 3d⁵ 4s¹

Copper, Cu
[Ar] 3d¹⁰ 4s¹

When these two lose electrons, would they be removed from the 3d subshell or 4s subshell?

For example: Cr²⁺
Would become: [Ar] 3d³ 4s¹ ?
OR [Ar] 3d⁴ ?

Vivian Wang 3J

Each series has a specific energy level because those are the energy levels at either end of the jump producing a particular line in the spectrum. "For example, in the Lyman series, n is always 1. Electrons are falling to the 1-level to produce lines in the Lyman series. For the Balmer series, ...

Vivian Wang 3J

Moles of solute stays the same for diluting and molarity changes.
However, when you take a smaller volume of a solution, molarity stays the same, but moles of solute will decrease.

Vivian Wang 3J

It is the amount of energy. One photon removes one electron, provided that the photon has reached the threshold energy.

Vivian Wang 3J

In this problem, you are given initial volume (1.0 L) and initial molarity (0.20 M NH4NO3). When the florist adds 3.0 L of water, the solution is diluted, and therefore will have a new volume and new molarity. The new, or final, volume of this solution will be initial + addition water, which is: 1.0...

Vivian Wang 3J

Yes please.

Vivian Wang 3J

Most people find chemistry jokes funny; I find them prephosphorous.

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