CHEMISTRY COMMUNITY

Mansi_1D

You would use them to name the ligands if the ligand already contains a di-, tri-, and so on. For example if you have (en)3 which is ethylenediammine, you would write it as trisethylenediammine to show that there is three of those since there is already a di- in the actual molecule.

Mansi_1D

You would look at what the highest energy shell is for the atom. So for carbon it's n = 2 shell. You would write the shell number and the hybridization for the atom for sigma bonds (carbon = 2sp3) . It would be the same thing for pie bonds but you would only include the p subshell when you write the...

Mansi_1D

I think you would get the point if you right either or, but if it has lone pair it would be a better to write Square Planer.

Mansi_1D

The strength increases in the following order: London/induced-dipole < dipole-dipole < hydrogen < ionic. Covalent bond is stronger than ionic bond if the ionic compounds are in water.

Mansi_1D

If you are just determining the conjugate base or acid for one compound, then yes, it would always have water.

Mansi_1D

How do you determine if a ligand is monodentate, tridentate and so on?

Mansi_1D

I understand that coordination number is the points at which the ligands attach to the central atom, but do ligands ever double bond with the central atom? If so, would you count the double bond at one point for coordination # or 2?

Mansi_1D

B12 is a nutrient needed for the healthy function of nerve tissues, brain function, and the procdution of red blood cells.

Mansi_1D

For number 19 part c in Focus 6C, it asks which of the two pairs, HBrO2 and HClO2 is a stronger acid. The corrected answer is HClO2 and I wanted to why HClO2 is stronger because Br and Cl are in the same group so wouldn't you look at the bond strength/ atom size to determine acid strength? Br is lar...

Mansi_1D

How can you tell if a compound would be completely or incompletely ionized in water to determine if it's a weak/strong acid or base?

Mansi_1D

Strong bases are completely ionized in water. They are usually the Alkali metals (oxides and hydroxides). Weak bases are not completely ionized in water and any compound with nitrogen is a weak base.

Mansi_1D

I'm not completely sure but I think it's because trichloroacetic acid has a greater electronegativity since it has chlorine than acetic acid.

Mansi_1D

Strong acids produce more protons in solution than a weak acid. Strong acids are completely ionized in solution whereas weak acids are incompletely ionized.

Mansi_1D

Acetic acid is a weak acid because it doesn't dissociate very much in solution, meaning there are many more whole molecules of acetic acid (many CH3COOH molecules) than separate acetate and hydrogen ions.

Mansi_1D

A compound is amphoteric if it can act as both an acid and a base. It can donate protons and also accept protons.

Mansi_1D

I'm confused when an acid is a proton donor or acceptor. On one of the lecture slides it said Lewis bases are proton donors and Lewis acids are acceptors. However, then in the next lecture, for the descriptions of acids, it said acids are proton donors. So is there a difference between Lewis bases &...

Mansi_1D

The first bond that forms between atoms is always a sigma bond and any other bonds are pie bonds. So if there is a double bond, one of them is sigma bond and the other is pie bond. If it's a triple bond, one of them is a sigma bond and the other two bonds are pie bonds, and so on.

Mansi_1D

Bases are proton acceptors and acids are proton donor.

Mansi_1D

Yes, it takes more energy to break stronger attractions, and therefore the melting point is higher.

Mansi_1D

We are still having lecture since we didn't have class on one of the Mondays due to the Getty fire. Dr.Lavelle sent an email about it last week.

Mansi_1D

Yes, if there is a lone pair, they push down on the atom because they have greater repulsion than bonding pairs, and thus greater impact.

Mansi_1D

The shape of Xenon Tetrafluoride was square planer. It has four bonding pairs and 2 lone pairs.

Mansi_1D

There is linear shape, trigonal planer, tetrahedral, trigonal bi-pyramidal, octahedral, trigonal pyramidal, seesaw, and square planer.

Mansi_1D

I think we will have to know the prefixes such as tetra-, hexa and etc and name compounds based on that, but I don't think they would be super hard ones.

Mansi_1D

Focus 2E is about different shapes for different molecules, but Dr. Lavelle hasn't talked about them yet. I'm pretty sure we will need to know them for the final tho. He might talk about it in the next lecture.

Mansi_1D

A newly designed laser pointer with a certain frequency is pointed at a sodium metal surface. An electron is ejected from the metal surface with wavelength 1.10 nm. What is the frequency of the light from the laser pointer? The work function of sodium is 150.6 kJ∙mol-1. Can someone walk me through t...

Mansi_1D

It would be safer to turn in homework from recent topics since its new material and we already turned in homework for others.

Mansi_1D

What does it means by electrons in resonance structures are delocalized?

Mansi_1D

Yes, that seems like it works!

Mansi_1D

My TA said that both the name and the chemical formula will be given, unless it's a very common one that we would all know.

Mansi_1D

You use Einstein's equation to the find energy of a photon using E= hv. De Broglie's equation, lamda = h/mv can be used to find the wavelength for a particle with a particular mass and momentum. This De Broglie's wavelength can then be used to find energy using the equation E=hc/lamda. Einstein said...

Mansi_1D

you look at the last digit in the group number for the elements. For example, carbon is in group 14, so it has four valence electrons.

Mansi_1D

Yes you need to show whether it's a cation or anion and how many electrons it gained of lost. You also need to that into account when your are drawing the lewis structure.

Mansi_1D

The atom that is more electronegative is in the middle because it's pulling more electrons to itself.

Mansi_1D

You can also use the rydberg number - 1.097x10^7 m to find the wavelength with only one equation: 1/lamda = R(1/nfinal - 1/ninitial). This way you wouldn't have to find the frequency first then use another equation to find wavelength.

Mansi_1D

It's negative when the electron is going from higher energy level (initial) to a lower energy level (final) which would make sense because energy is released when electron move from a higher energy level to a lower energy level. In the equation, you would subtract final - initial which would give yo...

Mansi_1D

To find the wavelength, you would use h/mv equation. The mass is 5.15 ounce and velocity is 92mph. However, the mass has to be in kg and the velocity in m/s when you plug it into the equation, so yes you would have to convert them first.

Mansi_1D

The values as electrons are going down to E=0 is negative because energy is being released. When energy is released, it is shown as a negative value. As electrons go from a higher energy level to a lower one, a photon (energy) is released.

Mansi_1D

Yes, delta x is 3.50 pm in the equation and you would need to convert it to meters because that's the SI unit for position.

Mansi_1D

You would use h/mv to find the wavelength because velocity is given and you know what h and m are.

Mansi_1D

No, one photon ejects only one electron. If the incoming light has a frequency greater than the threshold needed to eject the electron, the excess would be given off as the kinetic energy and energy of released electron would be the work function plus kinetic energy.

Mansi_1D

You would use the equation to find the maximum wavelength only when the temperature is given and vice versa. I don't think we will be using it if Lavelle doesn't talk about it.

Mansi_1D

After you find the molar mass of NH3, you don't need to convert it to grams because you are looking for grams of N2H4, not NH3. So convert NH3 to moles and multiply it by the molar ratio of NH3 to N2H4 which is 2 mol of NH3 for every 1 mol N2H4 based on the equation. Multiplying this will cancel out...

Mansi_1D

It's always been 3 so far for me for all the problems I have solved, so I would test 3 first. However, this doesn't have to be the case every time so you would just keep multiply until you get a whole number.

Mansi_1D

Electrons move up the energy level when they become excited which is when they absorb energy. When an atom is in an excited state, they are unstable so ideally they try to go back to their ground state, their lowest energy level which doesn't have to n=1. They do so by releasing energy in the form o...

Mansi_1D

To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20 m NH4NO3(aq) by adding 3.0 L of water. The florist then adds 100. mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive? Can some walk me through the steps to find the moles of nitrogen ato...

Mansi_1D

The first step is to find how many grams of tin (Sn) and Oxygen (O) are in the sample. The mass of Sn is already given which is 1.50 g. Since they tell you the mass of the crucible and product combined is 28.35 g, you can find out the mass of the product alone my subtracting the total mass from the ...

Mansi_1D

I think you can get to the final answer by adding up the molarities you calculate, but I'm not sure. The way I did is that I found the moles of K in each of given the compounds by diving the grams of each samples by its molar mass and multiply the molar ratio of K ions in one mole of each sample. I ...

Mansi_1D

To calculate the electron's uncertainty in kinetic energy, you can use the formula KE=1/2mv^2. Next, you can multiply the electron's uncertainty in KE you found by Avogadro's number to find the uncertainty in KE per mole of electrons.

Mansi_1D

Hi! Just to make sure, our first test next week will be on the fundamentals only right? Or is it going to include everything we cover in lecture till the test day including the quantum stuff?

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