CHEMISTRY COMMUNITY

Germar G 4F

Vy Lu 3A wrote:In some answers, H2O is written as OH2 because we want to emphasize that the oxygen atom in the water molecule is the partially negative part of the ligand that binds to the metal central atom in the coordination compound.

Got it, thank you!

Germar G 4F

Can someone explain the difference between these two?

Germar G 4F

In some answers from the HW, for example 17.31 6th edition, they write H2O as OH2. Is there a reason for that? If so, when do we write it OH2?

Germar G 4F

Not sure if this is the right topic/section to ask this question, but why is it that NH3 will displace H20 in a coordination compound?

Germar G 4F

Can someone explain why having a higher Ka makes a stronger acid?

Germar G 4F

pH measures the concentration of H+/H30+ concentration, while pOH measures the amount of OH-.

Germar G 4F

How does electronegativity affect the strength of an acid/base? I don't understand exactly why a higher electronegativity means a stronger acid. Can someone explain this please?

Germar G 4F

The strength of an acid or base is defined by the extent of dissociation it has in water. So if it is completely dissociated, then it can be considered a strong base/acid. However, if it is partially dissociated, then it will be a weak acid/base.

Germar G 4F

MadisonB Lec 1 Dis 1K wrote:You could also look at the problems on past tests or previous review sessions.

where can you find these?

Germar G 4F

So if monodentates can only form one interaction with a metal ion, does this mean that in order for a molecule to be considered a monodentate ligand, it needs to have only 1 lone pair? Is this true for all monodentates?

Germar G 4F

Polar covalent bonds share electrons unequally which allow for partial charges to occur. An ion, however, forms ionic bonds, which involve the transfer of electrons, not sharing. Thus, ionic bonds can't have dipoles/partial charges like polar covalent bonds. They have a set charge. We don't really d...

Germar G 4F

XeF2 is linear because every time you have 3 lone pairs on the central atom and 2 bonded pairs, it will result in a linear shape. (AX2E3) The three lone pairs on the central atom will equally space out around it, and will repel/push the bonded pairs into a linear structure.

Germar G 4F

Polarizing power is basically an atom's ability to distort or effect an electron cloud around another atom. Ions have the highest polarizing power because they contain strong charges that have a high potential to distort other atoms. A smaller atomic radius means and a higher ion charge are usually ...

Germar G 4F

Why does CH4 have a lower boiling point than CCl4? In other words, why is CCl4 more tightly held compared to CH4? What does the difference in amount of electrons have to do with boiling temperature?

Germar G 4F

Why is F2 a gas and I2 a solid at room temperature? Can someone explain why this is?

Germar G 4F

TeCl4 has different bond angles because of its molecular geometry. It has seesaw geometry, since it has 4 single bonds and one lone pair. All seesaw geometries will have 90, 120, and 180 degree angles in their 3-D shape. If you look at a picture of "seesaw geometry" you can see each of the...

Germar G 4F

How do you determine the polarity of a molecule from its molecular shape? What's an example of a non-polar molecular shape and a polar molecular shape?

Germar G 4F

The shape of a molecule directly influences the strength of interactions by attractive/repulsive forces. Dr. Lavelle used the rod-shaped vs. spherical shape example in lecture, where the rod-shaped molecules have a stronger bond/higher boiling point because the dipole-dipole attractions were closer ...

Germar G 4F

Yes, all molecules with four bonding pairs and no lone pairs will be tetrahedral.

Germar G 4F

When comparing bond strengths in lecture, Dr. Lavelle said that HI would be the strongest acid in comparison to HF, HCl, and HBr. Can someone explain why having the weakest bond means it will be a strong acid?

Germar G 4F

Why is the dissociation energy of a covalent bond, like N2, 932 kJ/mol and an ionic bond's, like NaCl, is -250 kJ/mol? (I wrote these down on my notes from the lecture). Since ionic bonds are stronger, wouldn't it have a much higher dissociation energy than N2? Why is it's dissociation energy negati...

Germar G 4F

Lewis structures are a good starting point in finding the 3-D structure of a molecule, because they help us find an approximate location of binding e- and lone pair e-, which is what we need to determine the shape of a molecule (for example, if it's bent(H20) or linear (CO2)).

Germar G 4F

The number of nodal planes in an orbital is equal to the value of the angular momentum quantum number (l).

Germar G 4F

This situation usually happens with Zn 2+. Since we want to avoid having two half-filled orbitals when there are 2 electrons that could be used in the outer 4s shell, we take the electrons from s2 and give them to d8, so that this way the orbital is at fully filled with electrons (d10).

Germar G 4F

The central atom is always the one with the lowest ionization energy/electronegativity. An easier way to tell which is the central atom, however, is by seeing which atom we have the least of. For example, for CH4 C would be in the middle since there is only one C atom.

Germar G 4F

5p1 represents an electron. Since an electron is negatively charged, and with In+ you are losing an electron, taking away the 5p1 accomplishes that in electron configuration notation. Same concept applies to N: if it is N^-3, then making 5p3 to 5p6 represents the three electrons that are gained by N.

Germar G 4F

If the momentum is large, meaning that the mass is large, then the wavelength will be more certain because a larger mass is obviously more noticeable than a smaller mass. Also, large objects like a baseball (speaking in relation to quantum world) have super small wavelengths and act more like a part...

Germar G 4F

Main differences are that covalent bonds share electrons, while ionic bonds (being far too electronegative) transfer electrons, which results in two oppositely charged ions (creation of cations and anions). Covalent bonds are also between two non-metals and are relatively weaker than ionic bonds (ex...

Germar G 4F

In lecture he said we would only need to know the concept behind it and that we wouldn't be doing any calculations (since multi-electron atoms are hard to work with).

Germar G 4F

Yeah, my TA told us we would need to know the Rydberg's Equation for this test.

Germar G 4F

Can someone explain what "orientation of the lobes" means? Is it just the position of the shape relative to the x, y or z axes?

Germar G 4F

Increasing the intensity of light helps does release more photons, but what matters is if each photon has enough energy to make an electron move. By changing the frequency, the energy of each photon is increased. So theoretically, there could be a situation where the light intensity is low, but the ...

Germar G 4F

The "work function" of a metal is the least amount of energy it takes in order for an electron to be bounced from that specific metal. So think of it as the threshold frequency, except that it is referring to energy. So a photon must be equal or greater than the work function in order to m...

Germar G 4F

This problem isn't asking you for the molecular formula, it's asking for the empirical formula. Note that they ask "In what atom ratios are the atoms present in vanillin?" implying that they are not looking for the exact amount of atoms in vanillin, but just the ratios. There is also no gi...

Germar G 4F

There is a list of diatomic elements, which means they get a subscript of 2 every time you write them in a chemical equation. The diatomic elements are Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, and Bromine. Remember them with this mnemonic:

Have No Fear Of Ice Cold Beer

Germar G 4F

Yeah, you can pick any 7 from the list of problems under the first section "Chemical & Physical Principles" on the syllabus.

Germar G 4F

Sorry guys, just realized this problem isn't even on the HW list. Wow lol. Anyway, thanks for the help!!

Germar G 4F

A metal M forms an oxide with the formula M2O, for which the mass percentage of the metal is 88.8%. (a) What is the molar mass of the metal? (b) Write the name of the compound. How would we go about to solve part a) of this problem? So far, I understand that the ratio of the mystery metal "M&qu...

CHEMISTRY COMMUNITY

Search found 38 matches

Re: OH2 vs H2O

Amphiprotic vs Polyprotic

OH2 vs H2O

NH3 vs H20

Ka calculations

Re: ph vs pOH

Electronegativity

Re: Weak Acid/Base vs. Strong

Re: More practice

Monodentates

Re: Polar covalent vs. polar ionic bonds

Re: Week 7 Step Up WS Question D

Re: Polar Power

CH4 vs CCl4

Relationship between atomic size and attractive forces

Re: Multiple different bond angles

Polarity and Molecular Shape

Re: Molecular shape

Re: Shapes

Relation between strong acid and weak bond

Dissociation Energy

Re: Molecule Shape

Re: Nodal planes

Re: s vs d orbital

Re: How to decide central atom?

Re: Cations/Anions

Re: Uncertainty Equation

Re: Difference Between Ionic and Covalent Bonds

Re: Coulomb's Law

Re: Test #2

Homework Problem 2.13

Re: Photons

Re: Work Function

Re: Molecular Formulas

Re: chemical formulas

Re: Homework Problems

Re: HW Problem F.7

Problem F.7