CHEMISTRY COMMUNITY

Sarai Ventura 1L

Yes I think it would be helpful to know the charges to save time and I think you should know the common ones.

Sarai Ventura 1L

No, you do not need to memorize it because it should be given on the front page of the constant page but you should be able to know how to properly apply it and know the units so you won't get point taken off.

Sarai Ventura 1L

You should know the common strong acids used like HCl,HNO3, HBr, HI, HClO3.

Sarai Ventura 1L

To Hope_Pham_1G Pi bonds are usually weaker than sigma bonds.This is contrasted by sigma bonds which form bonding orbitals directly between the nuclei of the bonding atoms, resulting in greater overlap and a strong sigma bond. Pi bonds result from overlap of atomic orbitals that are in contact throu...

Sarai Ventura 1L

The main difference between the two is that the cis isomer is a polar molecule whereas the trans isomer is non-polar. Both of the isomers have exactly the same atoms joined up in exactly the same order. That means that the van der Waals dispersion forces between the molecules will be identical in bo...

Sarai Ventura 1L

For the final you should just remember the common bond angles and not the special cases bonds. You are welcome to review them but do not try to memorize them.

Sarai Ventura 1L

You do not need to know or try to memorize the exact electronegativity values you just have to know the general trend of the periodic table.

Sarai Ventura 1L

Molecular geometries can be specified in terms of bond lengths and bond angles. The bond length is defined to be the average distance between the nuclei of two atoms bonded together in any given molecule. A bond angle is the angle formed between three atoms across at least two bonds. The bond angles...

Sarai Ventura 1L

According to the book formal charge is the electric charge of an atom in a molecule assigned on the assumption that the bonding is nonpolar covalent. Formal Charge (FC)= number off valence electrons in the free atom-(number of lone pair electrons+1/2 x number of shared electrons). However, since the...

Sarai Ventura 1L

Resonance structures are two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure. Resonance occurs when electrons can flow through neighboring pi systems. It is also known as a mesomerism and it is a way of describing del...

Sarai Ventura 1L

Well you have to keep in mind which element is closest to Fluorine which is the most electronegative element, my TA showed us a helpful tip to remember, she uses FONCl which will go on to FOClBrISCHP (following the trend) this can help you remember the order of the electronegativities of the nonmeta...

Sarai Ventura 1L

A covalent chemical bond between two atoms that is produced when one atom shares a pair of electrons with another atom that lacks such a pair. Also known as a covalent bond in which both the shared electrons are contributed by one of the two atoms.

Sarai Ventura 1L

The hybridization of orbitals is also greatly favored because hybridized orbitals are lower in energy compared to their separated, unhybridized counterparts. This results in more stable compounds when hybridization occurs. For example, carbon has four unpaired electrons it can have four equal energy...

Sarai Ventura 1L

On Friday during lecture the TA's talked about radicals, can someone please explain when we are able to use them or the concept of radicals.
Thank You.

Sarai Ventura 1L

No because you have to keep in mind that noble gases have full outer shell of electrons. Helium has two electrons in its outer shell and the rest have eight electrons. Because of their full outer shells, they are very inert and stable. This means they don't tend to react with other elements to form ...

Sarai Ventura 1L

Hund's rule is that every orbital in a subshell must be occupied with one electron before any one orbital is doubly occupied.

Sarai Ventura 1L

Those with a negative charge are called anions and those with a positive charge are called cations. The way I remember is that anions have two n's for negative and cations have a "t" just like the plus sign for positive.

Sarai Ventura 1L

A nodal plane is a plane with the probability of finding a electron is zero. The 2s orbital has a nodal shell, whereas the 2pz orbital or 2p orbitals have a nodal plane.

Sarai Ventura 1L

Work function is the minimum quantity of energy that is required to remove an electron from a metal.

Sarai Ventura 1L

I do not think that you have to memorize that. All the conversions you need are usually given on the front page.

Sarai Ventura 1L

I think only constants and formulas would be given on the front page. Information like ranges of high to low frequency and wavelength would not be given but it would be helpful to know.

Sarai Ventura 1L

I think it would be helpful to know the order how large the electromagnetic wave is.It would help to know the increasing wavelengths and frequency just remember that they are inverse to one another

Sarai Ventura 1L

It does not make a big difference I know that the professor uses 3.0x10^8 while the textbook uses 2.998x10^8. If the test has the constant formula on the front page then use what they give you and if not just use one that you prefer.

Sarai Ventura 1L

A photon is a particle that represents a quantum of light or other electromagnetic radiation. It also carries energy proportional to the radiation frequency.

Sarai Ventura 1L

According to the textbook, the amplitude represents the height of the wave above the center line.

Sarai Ventura 1L

The notation for molar mass is a capital M, just remember to pay attention to the units the molar mass unit is (g/mol).

Sarai Ventura 1L

Homework is everything we have covered in class until now. The homework is basically on the review section and perhaps you can do a couple of problems on chapter one just do not do the same ones from last week. Yes, it is on personal reference how you want to do it.

Sarai Ventura 1L

Option A is incorrect because the speed is constant. Option C is correct because the longer the wavelength is causes the slope to decrease.

Sarai Ventura 1L

I believe that sig figs are important in measurements because it allows to have a more accurate and precise calculation.They also let us know when it is okay to round.

Sarai Ventura 1L

(a)Determine the mass of anhydrous copper(II) sulfate that must be used to prepare 250mL of 0.20M CuSO4 (aq). (b) Determine the mass of CuSO4x5H20 that must be used to prepare 250mL of 0.20 M CuSO4(aq).

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Charge of ligands

Re: Memorization

Re: Strong Acids

Re: How to identify pi and sigma bonds

Re: cis and trans

Re: Bond Angles

Re: Question for Exams [ENDORSED]

Re: Bond Angle

Re: Formal charge?

Re: How does a resonance structure work?

Re: Carbon and Sulfur electronegativity?

Re: Coordinate Covalent Bonds

Re: Hybrid orbitals

Radicals

Re: Valence shell on Noble gases

Re: Hund's Rule [ENDORSED]

Re: cation vs anion

Re: Nodal Planes- what are they exactly? [ENDORSED]

Re: What is work function? [ENDORSED]

Re: converting from keV to joules

Re: Information Provided on Exam

Re: Memorizing Wavelengths [ENDORSED]

Re: Speed of Light which is more accurate? [ENDORSED]

Re: still don't uderrsatnd what a photon is [ENDORSED]

Re: wavelength description [ENDORSED]

Re: What is the notation for molar mass?

Re: Homework? [ENDORSED]

Re: HW 1.3 [ENDORSED]

Re: Why are sig figs important?

Homework Problem G17