CHEMISTRY COMMUNITY

Paul Wong1B

Yes, it is required to write the state of matter that the components are in. Usually, the solvent will be written as a liquid and the other substances are aqueous because they are mixed with the water.

Paul Wong1B

I think it just depends on what unit the question is asking for.

Paul Wong1B

Q: What is the chemical formula for "banana"?
A: BaNa2

Paul Wong1B

You divide the moles by 0.500 because you need to find the concentration of the various gases by using: concentration = moles/volume (liters).

Paul Wong1B

You only add "ion" when naming a ligand that is a coordinate covalent compound by itself as an ion without binding to a respective anion or cation.
For example, [Co(NH3)5Cl]+ would be labeled as pentaamminechlorocobaltate(II) ion.

Paul Wong1B

As Dr. Lavelle stated, the negative charge of the oxygen is stabilized more with the chlorine atoms in the compound because chlorine is a very electronegative atom.

Paul Wong1B

Two criteria that you can use to determine the relative acidity of acidic compounds is by looking at the length of the bonds and the stability of the resulting anion after the H+ atom is removed.

Paul Wong1B

What is the chemical formula for "coffee"?

CoFe2

Paul Wong1B

The order of the atoms in the molecular compound can also aid in the formation of the Lewis structure. For example, the COOH at the end of the formula illustrates that there will be a carboxylic acid attached to the nitrogen.

Paul Wong1B

For an atom such as Oxygen and Sulfur, a double bond is sometimes needed in order to satisfy a full bond and to achieve a 0 (most stable) formal charge.

Paul Wong1B

a) 4s
b) 3p
c) 3p
d) 4s

Paul Wong1B

Another exception would be when when an atom has too little electrons in a compound. BeCl2, for example, is a compound in which the central atom does not possess an octet.

Paul Wong1B

For the compounds that you listed in the problem, the cation is always written first whereas the anion is written second. When writing the anion, replace the end of the anion with the suffix, -ide. For example, chlorine would be written as chloride. For organic compounds such as CH4 or Methane, ther...

Paul Wong1B

Be sure that when removing electrons, the electrons from the ns state are removed first before removing those from the (n-1)d state. (e.g. 4s state electrons before 3d electrons)

Paul Wong1B

If a molecule has a charge of 3+, it means that the molecule has 3 less electrons than it normally does. This would mean that you use 3 electrons less on the diagram than you would if you were drawing the ground state diagram. On the other hand, if a molecule were to have a 3- charge, then it would ...

Paul Wong1B

1. Use 194 nm, convert it to meters, and solve for frequency using c=wavelength x frequency 2. Use E=hv and solve for the energy. This energy is the energy of a photon that is radiated onto the surface 3. Next, use the formula E(kinetic) = E(photon) - E(threshold) to solve for the kinetic energy Sin...

Paul Wong1B

The question is asking about how many electrons can have the quantum number of n=2, meaning the 2nd shell. Since the 2nd shell possesses only s and p subshells, those subshells are the only ones that can have the number n=2. We learned that s- subshells have one orbital and that each orbital can hol...

Paul Wong1B

In a mathematical sense, the limit of the function $\frac{1}{n}$ as n approaches infinity is 0 (same principle applies for $\frac{1}{n^{2}}$ ), so the energy (E) value will go to 0 when n approaches infinity.

Paul Wong1B

Wu is correct. When electrons in an atom move from a higher state to a lower one (when electromagnetic radiation is emitted), they emit energy; and thus, the energy of the atom does not increase but rather decreases. On the other hand, the energy of an atom increases when it absorbs electromagnetic ...

Paul Wong1B

I believe you are correct in that the speed of light is a constant so it should be the same for all photons regardless of the frequency. However, the case would be different with particles that have rest mass as De Broglie's equation includes velocity to solve for the wavelength of a particle, which...

Paul Wong1B

Ben's answer for number 5 is correct. Dr. Lavelle used C3HO4 as an example in the post when he divided the respective number of moles by the lowest value of moles.

Paul Wong1B

Additionally, the order that the respective elements are given in a molecular formula gives insight on the specific formation that the atoms are placed in.

Paul Wong1B

You would need to find the diameter of the atoms instead of the circumference because the question is asking for the length of the stringed atoms, which is found by adding the diameters, and not the circumference of all the atoms.

Paul Wong1B

The energy required to remove an electron is the value of sodium's work function, so the value would be 150.6 kj/mol.

Paul Wong1B

Dr. Lavelle said that he rounded the value of the speed of light (c) to 3.00x10^8 in his lecture slide, so I would assume that it would be okay to use the value.

CHEMISTRY COMMUNITY

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