CHEMISTRY COMMUNITY

Louise Zhuang

Generally, a molecule with lone pairs on central atom will be electron donor which is Lewis base, and if the central atom has only six valence electrons it’s Lewis acid because it will be electron acceptor.

Louise Zhuang

What is electron withdrawing atoms which delocalize and stablize the negative charge? (What exactly does "withdrawing electron" means? What are some examples of such atoms?)

Louise Zhuang

(c) CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l)
Why isn't it an acid-base reaction?

Louise Zhuang

In 6th edition question 4.25, the answer key suggest that CH2Cl2 is polar. But if we draw the lewis structure in which the two Cl atoms are opposite to each other, wouldn't the charge cancel out and make the molecule nonpolar? How do we know which way to draw?

Louise Zhuang

Why is Sn an exception to the octet rule? (In SnCl2, Sn only has 2 single bonds and a lone pair)

Louise Zhuang

Could someone explain what is the interaction potential energy and what is polarizability? Is the potential always negative? Why?

Louise Zhuang

Is test 3 next Friday? Yeah I wonder what will be covered too.

Louise Zhuang

Do we have to remember the exact bond angle of shapes with lone pairs(e.g. bent) or we just have to say less than the bond angle with the respective shape without lone pairs?

Louise Zhuang

You can remember them by each electron geometries. For instance, start with AX6, which is octahedral in both electron and molecular geometry. Then replace one atom with lone pair(AX5E, which is square pyramidal, etc

Louise Zhuang

No, the bond angle is only associated with the molecular shape and number of lone electron pairs.

Louise Zhuang

Your explanation is basically right. The lone pair also has a strong negative charge, and there's nothing at the opposite side to cancel it out, making the molecule polar.

Louise Zhuang

What is the Lewis model and VSEPR formula for I3-?

Louise Zhuang

Because the VSEPR theory predicts that XeF₂ is linear, and Xe needs 3 lone pairs in order to maintain the linear structure of the molecule.

Louise Zhuang

The negative charge goes to the most electronegative atom and the positive charge goes to the least electronegative atom. The position doesn't really matter.

Louise Zhuang

Because bonding e- don't move around as much as lone pair e-, reducing the chance of getting closer to other e- and repel them. They have less energy too.

Louise Zhuang

Okay I get it now, it's because Cl reaches noble gas config this way. But it oxidation number the same as number of gained/lost electrons?

Louise Zhuang

The answer is +7, but I don't get the reason behind it.

Louise Zhuang

According to periodic trend, I.E. increases from left to right, but O is lower than N

Louise Zhuang

Give the notation for the valence-shell confi guration (including the outermost d-electrons) of (a) the alkali metals; (b) Group 15 elements; (c) Group 5 transition metals; (d) “coinage” metals (Cu, Ag, Au).

Can someone explain what does "notation" mean?

Louise Zhuang

For example, for the element Mn, when forming a +1 ion is electron removed from 3d or 4s orbital first? Why?

Louise Zhuang

Is the following statements true for multi-electron atoms? Why? -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 atom. Electrons having l = 2 are bet...

Louise Zhuang

Yes, when the wave function passes zero, its probability density(which is its derivative) is also zero, thus making it a nodal plane.

Louise Zhuang

You just need to understand its concept, not actually using it, so I think you should be fine.

Louise Zhuang

What is the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)?

Louise Zhuang

Can someone explain to me what is Balmer series and what does those lines represents? I kind of know how to use the equation to solve problems but I'm struggling conceptually. (I was working on Q1.57 on 6th edition)

Louise Zhuang

What is the minimum uncertainty in the speed of an electron confined to within a lead atom of diameter 350. pm?
Is the uncertainty in position 350. pm in this problem?

Louise Zhuang

Why is the square of the wavefunction(psi) the probability density? What is it exactly? (I read the textbook but it doesn't make a lot of sense to me...)

Louise Zhuang

What is KeV? When you see it as the unit of energy, do you use E=hv or lamba=h/p?

Problem: 1.23 The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.

Louise Zhuang

Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 = 105 m/s in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. How do you do this without knowing pro...

Louise Zhuang

Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n = 4 to n = 2.

What is Rydberg formula?

Louise Zhuang

Does this happen when the frequency of light decreases? Why?
(c) The extent of the change in the electrical field at a given
point decreases.

CHEMISTRY COMMUNITY

Search found 31 matches

Re: identify base/acid from lewis structure

Electron Withdrawing Atoms?

6th 12.9c

Polarity of CH2Cl2

SnCl2

Interaction Potential Energy and Polarizability

Re: Test 3

Bond angle

Re: Naming the Shape

Re: Resonance Structures and bond angles

Re: Polar molecules

Lewis and VSEPR for I3-

Re: Noble Gas Valence Electrons

Re: Poly-atomic Ions

Re: VSEPR theory

Re: What is the maximum oxidation number of chlorine? Why?

What is the maximum oxidation number of chlorine? Why?

Why is ionization energy of oxygen lower than nitrogen?

What is the notation for the valence-shell configuration?

Is electron removed from 3d or 4s first?

Shielding Question

Re: nodal/radial planes

Re: H(psi)=E(psi) Equation

atomic orbital and molecular orbital?

Balmer Series?

About Uncertainty in position

What is probability density?

6th HW 1.23 What is KeV?

6th Edition homework 1.37 wavelength of protons and neutrons

6th edition homework 1.13 Rydberg Formula

Homework Question 1.3, 6th Edition