CHEMISTRY COMMUNITY

Shione Nakahara 1F

Oxoacids more readily lose H+ if resulting anion is stabilized by electron withdrawing atoms which delocalize and stabilize the negative charge.

Shione Nakahara 1F

As you go down the group of the periodic table, acidity increases with the decrease of electronegativity (since the size of the atom increases). The smaller the atom, the shorter the bond and thus harder for them to dissociate in water. In my notes from class it says that HF<HCl<HBr<HI which goes fr...

Shione Nakahara 1F

Most acids are weak acids that dissociates incompletely. These acids have higher pKa than strong acids which release all there H+ when dissolved in water. Likewise, a weak base is a base that does not ionize fully in water and also has a lower pH compared to strong bases.

Shione Nakahara 1F

In my notes I have HF,HCl<HBr<HI. (less acidic to more acidic)

Shione Nakahara 1F

The strength of an acid determines its ability or tendency to lose a H+. A strong acid completes ionizes in a solution while a weak acid only partially dissociates. Stronger acids have a smaller pKa.

Shione Nakahara 1F

Bonding pairs take up less space because they are farther away from the central atom and is controlled by the sharing atoms, while a lone pair is closer to the nucleus and repels more strongly.

Shione Nakahara 1F

It usually helps to draw out the electron configuration diagram. For example, for Ti, its electron configuration is [Ar]4s^2 3d^2 so it would make sense for it to have 4 valence electrons from the outermost 4s electrons and the 3d electrons.

Shione Nakahara 1F

Yes, a sigma bond is stronger than a pi bond. This is because the length of a sigma bond is shorter than a pi bond, and it takes more energy to break a sigma bond.

Shione Nakahara 1F

A resonance structure has a greater importance if it fulfills the octet rule and if it has minimum charge separation. In addition, there should be no like charges on atoms that are next to each other.

Shione Nakahara 1F

The ability of a cation to distort an anion (or pull an electron away) is known as the polarizing power.

Shione Nakahara 1F

Delocalization is when electric charge is spread over more than one atom. If there are delocalized electrons, it increases the stability of the system compared to a similar system where electrons are localized.

Shione Nakahara 1F

The trends are basically the same, and the trend increases as you go across a period and up a group. Electronegativity is how likely the atom will attract electrons, while electron affinity is the amount of energy released when an electron is added to the atom.

Shione Nakahara 1F

Yes, for example, a molecule like NaOH. The Na+ ion is ionically bonded to the OH- ion, but for the OH- ion, the oxygen and hydrogen atoms are covalently bonded together.

Shione Nakahara 1F

I'm not sure if I understood your question correctly, but yes, there can be two pairs of elements sharing a bond in a linear structure like the previous poster said.

Shione Nakahara 1F

A lower electron affinity indicates that an atom does not accept electrons as easily.

Shione Nakahara 1F

Octet rule means that when atoms combine to form molecules, they each lose, gain, or share valence electrons until they attain/share eight electrons.

Shione Nakahara 1F

For chromium and copper, a completely full or half full d-sublevel is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to the 3d orbital.

Shione Nakahara 1F

I think you should know how electron affinity increases from left to right within a period (caused by the decrease in atomic radius) and how electron affinity decreases from top to bottom within a group (caused by the increase in atomic radius).

Shione Nakahara 1F

The main difference between them is that continuous spectrum contains no gaps whereas line spectrum contains many gaps.

Shione Nakahara 1F

FInd the elctron configuration first then draw the valence orbitals so you can look for the unpaired electrons.

Shione Nakahara 1F

Orbitals are region of space around the nucleus where we can find electrons with the largest probability.

Shione Nakahara 1F

I think Professer Lavelle used half arrows!

Shione Nakahara 1F

Yes, the energy of the photon has to overcome the threshhold energy, and any energy of the photon that is left over is converted to kinetic energy of the electron.

Shione Nakahara 1F

I would use the atomic mass on the periodic table he gives us, and round at the end.

Shione Nakahara 1F

Unless the question specifies otherwise, I would do liters

Shione Nakahara 1F

4 molecules of H20 has 8 atoms of hydrogen total

Shione Nakahara 1F

Assuming equal volume, technically yes. But, the different is negligible.

Shione Nakahara 1F

Its' not h. It's h bar which is the same thing as h/2pi

Shione Nakahara 1F

Count the atoms to get the molecular formula. The empricial formula is the simplified ratio!

Shione Nakahara 1F

I usually look for an element that appears only once on both sides of the equation and balance that first :) Make sure the amount of different elements on both sides are equal. But it also might help to balance the polyatomic molecules first!

Shione Nakahara 1F

yes, use the de brogile's equation (lambda = h/mv). solve for v the velocity, because you were given the wavelength (lambda= 100picometers) in the problem , and both h (plancks constant) and m (mass of neutron) are constants. :)

CHEMISTRY COMMUNITY

Search found 31 matches

Re: Oxoacids

Re: Strength of an acid

Re: Strong or weak acids/ bases

Re: Strong Acids

Re: Weak vs strong acids [ENDORSED]

Re: Lone pairs

Re: Transition Metal Valence Electrons

Re: strength of sigma and pi bonds

Re: ranking

Re: Polarizing power

Re: Resonance

Re: Electronegativiry vs electron affinity [ENDORSED]

Re: Ionic versus Covalent Bonds [ENDORSED]

Re: Lewis Structure

Re: electron affinity [ENDORSED]

Re: OCTET RULE [ENDORSED]

Re: Exceptions for electron configuration

Re: Trends to Know

Re: The visible spectrum

Re: Unpaired Electrons [ENDORSED]

Re: The concept of Orbitals

Re: How to properly format your answers

Re: Photoelectric Effect

Re: Rounding atomic weight (general question) [ENDORSED]

Re: Units - L or mL? [ENDORSED]

Re: What do the coefficients/subscripts represent [ENDORSED]

Re: Molarity [ENDORSED]

Re: Using the uncertainty principle [ENDORSED]

Re: Finding Empirical and Molecular Formula [ENDORSED]

Re: Balancing Chemical Reactions

Re: 1.41 [ENDORSED]