CHEMISTRY COMMUNITY

Chudi Onyedika 3A

Yes, Kw is a constant.

Chudi Onyedika 3A

There is such a small difference between each unit that it is ok to make 1 bar equal to 1 atm.

Chudi Onyedika 3A

You must choose the appropriate R value by looking at the units. Each R value is provided on the equations sheet.

Chudi Onyedika 3A

Yes, they are calculated the same way. You do not need to convert unless it is requested.

Chudi Onyedika 3A

You would use it when you want the Kc of the reverse reaction.

Chudi Onyedika 3A

You should stick with Kelvin as the unit of temperature in this equation.

Chudi Onyedika 3A

If you are using concentrations, then use Kc. If you are using pressures, then use Kp.

Chudi Onyedika 3A

K will simply become the inverse of the reaction.

Chudi Onyedika 3A

You should use Kelvin for the Ideal Gas Law and other temperature equations.

Chudi Onyedika 3A

Hi! I'm not sure about this, but I think the answer sheet specifically mentions NO2 since it has the largest concentration out of the 4 molecules. Typically, I think you just have to make sure that the root chosen is positive and is not a value greater than any of the initial concentrations. Hope t...

Chudi Onyedika 3A

Why is the concentration of NO2 used specifically to determine the root of choice?

Chudi Onyedika 3A

Ligands are Lewis bases that donate a lone pair each to form a coordination compound with a transition metal.

Chudi Onyedika 3A

Water can be either an acid or a base. It can accept a proton or donate a proton.

Chudi Onyedika 3A

I am confused as to why something that is more electronegative would result in the formation of a weaker acid. Would the H+ not be more attracted to Cl- if it is so electronegative, thus making it harder to break away and therefore an overall weaker acid? When there are more than two other atoms in...

Chudi Onyedika 3A

Yes, carbonic acid will be formed.

Chudi Onyedika 3A

It is the name for iron if its compound has a negative charge.

Chudi Onyedika 3A

We do not need to know how to identify. The only thing that we must remember is the amount of bonds that are formed.

Chudi Onyedika 3A

You need to factor the chlorine that is outside of the brackets as well when determining the oxidation number for Cobalt.

Chudi Onyedika 3A

It is just an abbreviation for ethylenediamine

Chudi Onyedika 3A

You would place in alphabetical order then put the TM

Chudi Onyedika 3A

It is because auqa pentacyanocobaltate has a negative charge. Ate- is applied for TM compounds with negative charges.

Chudi Onyedika 3A

If an ion of opposite charge came up to the atom and it was selective towards a side, then the molecule would be polar. If not, then it would be nonpolar.

Chudi Onyedika 3A

There are 5 regions of electron density: 4 atoms and 1 lone pair. The axial plane has 90 degree angles and the equatorial plane has 120 degree angles.

Chudi Onyedika 3A

A sigma bond is stronger than a pi bond

Chudi Onyedika 3A

120 in the equatorial plane, and 90 in the axial plane

Chudi Onyedika 3A

The two lone pairs would require more than 90 degrees

Chudi Onyedika 3A

Bending is typically the result of lone pairs pushing against bonded pairs.

Chudi Onyedika 3A

The space taken by the two lone pairs results in the hydrogen atoms being pushed downwards.

Chudi Onyedika 3A

If there are only two atoms in the bond, it is linear.

Chudi Onyedika 3A

It must be experimentally determined. However, Lewis structures and models can help approximate.

Chudi Onyedika 3A

Lone pairs have more freedom and are able to occupy more space compared to bonded electrons.

Chudi Onyedika 3A

The valence electrons would become more loosely held, giving the bond more distortion. This is a covalent character.

Chudi Onyedika 3A

Yes, because electrons will have uneven distribution that results in a temporary dipole.

Chudi Onyedika 3A

Yes, Lewis bases donate their electrons when forming coordinate covalent bonds.

Chudi Onyedika 3A

Ideally, you would want each atom to have no charge. If there are charges, then you should select the structure that has the least amount. You should also select the structure that has negative charges on the electronegative atoms.

Chudi Onyedika 3A

Sulfur is in the 3rd energy level, which gives it access to the d-orbital. The d-orbital gives room for more electrons.

Chudi Onyedika 3A

Atoms with lower ionization energy can create more bonds because they have fewer valence electrons.

Chudi Onyedika 3A

A lone pairs are valence electrons around an atom that are not participating or needed in the particular bond.

Chudi Onyedika 3A

Covalent bonds have "ionic character" when it consists of an highly electronegative atom bonded with an atom that is not as electronegative. Electrons will gravitate towards the electronegative atom in the covalent bond more, giving that atom a partial negative charge and giving the other ...

Chudi Onyedika 3A

The bond with more electrons will result in the positively-charged nuclei of the atoms being pulled in closer because opposites attract.

Chudi Onyedika 3A

Yes, a salt is a chemical compound containing an anion and a cation. Molecules are held by covalent bonds.

Chudi Onyedika 3A

P represents the momentum of an object. It is calculated by multiplying the mass by the velocity. You should only be applied when an object has those two factors.

Chudi Onyedika 3A

The 3d orbital must be filled prior to entering the 4s orbital.

Chudi Onyedika 3A

The closer an atom is to having a complete valence shell (a shell containing either 2 or 8 electrons), the more it will want electrons. This is electronegativity.

Chudi Onyedika 3A

There are 6 valence electrons in sulfur (6e-). There are also 6 valence electrons in oxygen (6e-). In Sulfate, there are 4 oxygen atoms and 1 sulfur atom. If you multiply 4 oxygen atoms by the number of electrons in each, that would equal 24 electrons. If you multiply 1 sulfur atom by the number of ...

Chudi Onyedika 3A

Dr. Lavelle multiplied the number of oxygen atoms by 4 because there are 4 oxygen atoms in sulfate. In ammonium, there are 4 hydrogen atoms and only one nitrogen atom, which is why he multiplied the number of atoms in hydrogen by 4.

Chudi Onyedika 3A

The electron density distribution is the probability of finding an electron in a specific space

Chudi Onyedika 3A

Silver's configuration ends at 4d9. However, when an orbital is not completed or halfway completed, it is typically unstable. In order to stabilize the atom, you would need to take an electron from the 5s orbital (which is ok because it will become 5s1, half of the orbital) and add it to 4d9 to make...

Chudi Onyedika 3A

Dr. Lavelle was referring to a silver atom in its ground state (5s), the number 5 being the energy level and s referring to the orbital.

Chudi Onyedika 3A

Won't the mass of the electron need to be given in order to solve A) of this problem? This might be kinda obvious, but kinetic energy only applies to electrons right? So whenever we use the equation KE = \frac{1}{2}mv^{2} the m will always represent the mass of an electron? The kinetic energy equat...

Chudi Onyedika 3A

When increasing the intensity of light, the number of photons are increased.

Chudi Onyedika 3A

The Work Function and the Threshold Energy are the same. The word "work" in this instance refers to energy.

Chudi Onyedika 3A

Energy level is dependent on an electron's placement outside of the nucleus. It is based on the distance of the electron orbital from the nucleus of an atom. The higher the energy level, the more distance the electron orbital is.

Chudi Onyedika 3A

Light intensity is proportional to the number of photons. Light frequency is the number of waves that passes a point within a certain amount of time.

Chudi Onyedika 3A

Light absorption, reflection, and diffraction are all examples of light behaving like a wave.

Chudi Onyedika 3A

I would recommend using a calculator. It is important to remember converting between appropriate units when doing so.

Chudi Onyedika 3A

The unit "mmol" is known as a millimole; it is equivalent to 1 mol multiplied by 1000.

Chudi Onyedika 3A

When a property is extensive, it is dependent on quantity. When a property is intensive, then it is not dependent on quantity. Volume is extensive because it is a measure of an object's size. Density is intensive because an increase in a object's size or amount does not directly result in an increas...

Chudi Onyedika 3A

If zeros are trailing without being after a decimal point, then they are not significant figures. Any non-zero number is a significant figure. Zeros between non-zero numbers are significant figures as well.

Chudi Onyedika 3A

There are 3 significant figures; 7 is a significant figure because it is a non-zero number, and the 2 zeros are significant figures as well because they trail after a decimal point.

Chudi Onyedika 3A

Professor Lavelle mentioned that Kelvin (K) would mainly be used in this class.

Chudi Onyedika 3A

Since you have balanced Fe, move on to another element. There are clearly less O atoms on the product side. Place a different coefficient by the CO2 and analyze how that changes the total number of C and O atoms on each side. If one side has more atoms than the other side, then place a coefficient o...

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