CHEMISTRY COMMUNITY

Emily 1E

The question is "In a nanotechnology lab you might have the capability to manipulate individual atoms. The atoms on the left are gallium atoms (molar mass 70 g/mol), those on the right are atoms of astatine (molar mass 210 g/mol). How many astatine atoms would the pan on the right have to conta...

Emily 1E

The question is: Noting that the bond angle of an sp3 hybridized atom is 109.5 and that of an sp2 hybridized atom is 120, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased? What exactly does this mean? What is the s-charac...

Emily 1E

For the reaction 2HI + CaO -> CaI2 + H2O how do you know which is the acid and which is the base?

Emily 1E

Toolbox 17.1 is also about naming coordination complexes, so I assume that's not needed as well

Emily 1E

It's a central metal atom attached to ligands in a ring/cyclical structure. The ring structure can only be created with polydentate ligands, that can form coordinate bonds with more than one other atom/molecule. In most cases, the metal atom is bonded to a ligand, which is bonded to another ligand w...

Emily 1E

Do lone pairs have an effect on overall polarity of a molecule? For example the answers say SF4 is polar, even though all the atoms around the central atom are the same and exhibit the same dipole moments that should cancel out. Is it because the lone pairs effects the shape of the structure and pus...

Emily 1E

VSPER theory is only concerned with the regions of electron density around the central atom. Lone pairs on non central atoms don't count as regions of electron density

Emily 1E

CFCl3 does exist. I think it is slightly polar. In general, if a central atom has more than 3 atoms around it and the 3 atoms are not all the same, the dipole moments don't completely cancel. In this case, the electronegativity different in C-F is slightly large than that of C-Cl, so there is a resu...

Emily 1E

Will we have to memorize bond angles for the final? How much detail will we have to know about them?

Emily 1E

Correct me if I'm wrong, but I don't think that is an explicit rule, I think it just depends on which atoms are bonding to which, and how many electrons (both bonding and lone pair) you need to draw into the Lewis Structure. For example, oxygen tends to form double bonds in both large and small mole...

Emily 1E

The question asks to draw the Lewis structure of ClO, which is a radical. How to you know whether the single lone electron goes on the Cl molecule or the O molecule?

Emily 1E

Although in general they have 3+ charges, it also depends on which atom(s) they are bonding with. If an element, like Bi, is bound to a more electronegative element it will have a 3+ positive charge. However, if Bi was the more electronegative atom in a molecule it would likely gain electrons to bec...

Emily 1E

This question may have an obvious answer, but why does Bismuth have a 3+ charge as opposed to a 3- charge? Arsenic is in the same group as bismuth and has a 3- charge, yet bismuth can bond with 3 F- to create a neutrally charge molecule (BiFe3).

Emily 1E

Non-polar covalent bonds are when a bond is formed when electrons are equally shared between two atoms (usually nonmetals belongs to p-block in the periodic table). The difference in electronegativity (tendency to accept bond pair of electrons towards itself) is negligible. So there no separation of...

Emily 1E

A radicals is a atom/molecule with a single unpaired valence electron. They contain an orbital valence orbital that only has one electron, not two. Radicals are highly reactive.

Emily 1E

Hydrogen generally can only formed one covalent bond, because of its single valence electron. Therefore, in molecules made up of 3 or more atoms, it would never be in the center because it can only bond with one other atom, as it can only share its singular electron in a covalent bond.

Emily 1E

What's the difference between the energy and the intensity of photons/light?

Emily 1E

Chromium is an example of the half filled exception. Instead of being Cr = [Ar] 4s^2 3d^4 as expected following the usual rules, it is 4s^1 3d^5. Because the 3d sub shell is more energetically stable if it has one electron in each of its 5 orbitals, that if it were to have only 4.

Emily 1E

B is also false because if the value of l is 0, then the value of ml must be 0 as well

Emily 1E

Part b) of this question where you have to determine whether the statements are true or false is: Electrons in an s-orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge because an electron in an s-orbital can penetrate to the nucleus of the ato...

Emily 1E

How many electrons can have the following quantum numbers in an atom: (c) n = 2?
The answer says 8 electrons, but wouldn't n = 2 be a p orbital, which has 6 electrons? Where do the other 2 electrons come from?

Emily 1E

Incident light means the same thing as the photon used to eject the electron in this context, and E = hv is used to convert the energy of the incident light to the frequncy

Emily 1E

It is given by the equation energy supplied by a photon - kinetic energy of the ejected electron, or hv - (1/2)mv^2

Emily 1E

"What is the minimum uncertainty in the speed of an electron confined to within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom." What does the second part of the question mean? What's the significance of havin...

Emily 1E

Energy = (planck's constant x speed of light)/wavelength
So the larger the wavelength, the greater the denominator and the lower the energy.

Emily 1E

In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series, Lyman series, Paschen series), as shown in Figs. 1.10 and 2.1. What is common to the lines within a series that makes grouping them together logical? The answers ...

Emily 1E

Also, what does the electric field in this context refer to?

CHEMISTRY COMMUNITY

Search found 27 matches

E3

4.43

J11c

Re: Final

Re: Chelate

4.25d - Lone Pairs

Re: Regions of electron density

Re: Polar Vs. Nonpolar

Remembering Bond Angles

Re: Double bonds

3.59a

Re: 3.25

3.25 e

Re: Nonpolar covalent bonds

Re: radicals [ENDORSED]

Re: Why can't hydrogen be a central atom? [ENDORSED]

Energy vs Intensity

Re: Half filled exception

Re: Question 2.41

2.37

2.29

Re: Photoelectric effect post-quiz 17-19 [ENDORSED]

Re: What is work function? [ENDORSED]

1.43 [ENDORSED]

Re: Homework Problem 1.5

Question 1.11

Re: HW 1.3 [ENDORSED]