CHEMISTRY COMMUNITY

Yilun Ding

It actually a T- shaped molecule.

Yilun Ding

A joke about Helium.

Yilun Ding

A joke about photon.

Yilun Ding

Cyanido is the new name for cyanide, also, when the complex is negatively charged, the metal cation will need to add ate. Iron is an exception that it will change its name to ferrate.

Yilun Ding

Yilun Ding

By reference to the periodic table, the Group 1 metals are more likely to lose an electron to become octet, then it has +1 oxidation state. However, because of relatively high ionization energy, the Group 7 non-metals will not lose electrons, instead, they usually gain an electron to become octet. T...

Yilun Ding

Yilun Ding

I think we should remember them.

Yilun Ding

There is a double bond which consists of a pi and a sigma bonds present in C and O. For the sigma bond, since there are three electron densities, its hybirdization should be C2sp2-O2sp2. For the pi bond, since there is a unused electron in its 2p orbital, it will form a pi bond with C2p and O2p.

Yilun Ding

Some questions in the final may come from the homework, like midterm.

Yilun Ding

How many bonds can an edta ligand bond to a metal cation?

Yilun Ding

This is because that increase the molecular mass will increase the number of electrons present in a molecule, its electron clouds will be more likely to be distorted(polariziability) which will lead to greater attraction.

Yilun Ding

First, we count the electron densities which is 5 (4 bonding pairs and 1 lone pair). It has the electron geometry of trigonal bipyramidal. However, instead having this structure, having 4 bonding pairs and 1 lone pair is called seesaw.

Yilun Ding

Only polar bonds have dipoles, and only dipoles form the hydrogen bonds will form.

Yilun Ding

Heisenberg was caught speeding. The cops pulled him over and asked "do you know how fast you were going? " Heisenberg says "No, but I can tell you exactly where I was!" The cops were like " you were going 120 mph in 80 mph zone!" Heisenberg says " Great! Now I am l...

Yilun Ding

never trust atoms, they make up everything.

Yilun Ding

When a chemist dies, they barium.

Yilun Ding

Both answers are acceptable since both models have total electrons of 16, and each atoms in both models is being octet. I am not sure about which one has the priority, but in the case of formal charge, both central atom N have formal charge of +1 ,the first model has a -1 charge on oxygen and the se...

Yilun Ding

For the molecule on the left, each nitrogen atom with lone pair can form hydrogen bond with water, also each hydrogen bonded with nitrogen with partial positive charge (due to the electronegativity) will form hydrogen bond with oxygen atom in water. There are 5 nitrogen atoms with lone pair and part...

Yilun Ding

No, we don't have to know.

Yilun Ding

We need to identify the shape by using the models mentioned in class. For centain type of model, we have to name the angles of its typical examples. Therefore, we should be able to name the shape and some basic angles.

Yilun Ding

A lone pair is also an electron density. Therefore, a molecule with 3 bonding pairs and 1 lone pair should have 4 electron densities.

Yilun Ding

First, a polar molecule must contain polar bonds. Then, if all polar bonds can cancel out it can be a nonpolar molecules, if cannot, it will become a polar molecule. To figure out whether all the dipoles can cancel out completely, you can use a vector diagram to see it clearly.

Yilun Ding

For a double bond, there will be one pi and one sigma, and one triple bond consists of two pi bonds and one sigma bond.

Yilun Ding

I think that the lewis structure cannot be used to demostrate the ionic bond because the "-----" represents the sharing of electrons (it is the characteristic of the covalent bonding). However, we can still use the dots in lewis diagram to represents gaining or losing electrons for ions.

Yilun Ding

Polarizing power is determined by the strength which a cation distorts the electron clould in the anion, and with greater polarizing power, that ionic compound would have more covalent characteristics.

Yilun Ding

In this case, the kinetic energy can just be calculated from 1/2mv2 since we already have velocity and mass (from the constant booklet)

Yilun Ding

Using the mass to calculate the moles of cisplatin first, then use the moles to divide the molarity ti get the volume. Next time you can figure out the relations by units.

Yilun Ding

I believe that the professor doesn’t expect us to know in our course, but after we learn these compounds, the name should be known

Yilun Ding

It is the lowest temperature we can reached

CHEMISTRY COMMUNITY

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Re: Angles

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edta

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