CHEMISTRY COMMUNITY

kellyz_1C

In the textbook on page 469, it says that usually oxides formed with the metalloid group are usually amphoteric but it also includes beryllium. I wasn't sure if the textbook meant boron instead as I have never learned Be to be a metalloid. Online, it says that Be is classified as a metal but has met...

kellyz_1C

strong acids and bases dissociate completely in water while weaker acids/ bases do not.

kellyz_1C

conjugate acids and bases are just the forms of the acids/ bases that accepted or donated protons to the other.

kellyz_1C

There are 7 strong acids that we should know and all others can be considered weak acids.
strong acids: HCl, HI, HBr, H2SO4, HN03, HClO3, HCl04

kellyz_1C

Electrons move around a lot so there could be small moments in time where all the electrons are on one side of the atom and none on the other side making one side partially negative and the other side partially positive. These partial charges can induce another atom to have partial charges as well, ...

kellyz_1C

You have to take in the electronegativities of the atoms and the structure of the molecule to see which dipole vectors cancel out and which do not.

kellyz_1C

I don't think the lengths are as clear-cut as that. Double bonds are shorter than single bonds (a triple shorter than double) because it has to do with how the electron orbitals overlap and to what extent

kellyz_1C

it is just a tool that helps you convert units when a problem gives you confusing/ nonconventional units

kellyz_1C

I remember learning in high school that breaking bonds actually takes energy and forming bonds releases energy but I can't remember why. Can anyone explain/ did we ever go over it?

kellyz_1C

a ligand is just a molecule or atom that binds to the central atom

kellyz_1C

a ligand can bind where a lone pair can be found (on the metal)

kellyz_1C

My TA went over an example in a discussion where a chelate was formed but only between three atoms and then said that it is usually between 5+ atoms. How are we to know when a chelate forms between less than 5 atoms?

kellyz_1C

it is related to how many bonds the molecules can make with the central atom

kellyz_1C

How can you tell when a molecule is polydentate vs monodentate? ie; why isn't cyanide polydentate

kellyz_1C

How about the chemical workers… are they unionized?

kellyz_1C

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.

kellyz_1C

Did you know that you can cool yourself to -273.15˚C and still be 0k?

kellyz_1C

If two atoms are isoelectronic how does that affect their characteristics? Do they still follow the relative trends of the periodic table? (ie; electronegativity, electron affinity, size, etc...)

kellyz_1C

I'm still a bit confused on how size affects these traits. Does it have something to do with electron shielding?

kellyz_1C

How do you tell when a molecule is resonant versus when it's just moving around in space? When drawing some of the resonance structures I could not tell

kellyz_1C

atoms that are in an ionic bond do not share electrons. covalent bonds do share electrons but the partial charges come from when the electrons are not equally shared (due to differing electronegativities)

kellyz_1C

In biology, we learned that covalent bonds are stronger than ionic bonds, but in chemistry, it is the opposite. How can this be?

kellyz_1C

not sure what you mean by this question. lone pairs take up more space than regular bonds and are found on the central atom.

kellyz_1C

Are there any exceptions (of elements) that we will have to know that do not follow the general trends of electronegativity/ electron affinity?

kellyz_1C

you should place the lone pairs in locations that maximize the space between them since they take up a lot of space.

kellyz_1C

it's helpful to look at the symmetry of a molecule when determining if it's polar or nonpolar. most symmetrical molecules are nonpolar and the opposite is also true. however differing electronegativities can also have an effect on the polarity of a molecule

kellyz_1C

How can you tell the difference between molecules that are trigonal planar vs trigonal pyramidal?

kellyz_1C

Do we need to know how to identify hybrid orbitals that contain orbitals past the d orbital?

kellyz_1C

Hello, the professor went over pi and sigma bonds but I'm still unsure of how to differentiate between the two/ what the difference is. How do we identify them on a diagram?

kellyz_1C

How can you tell when a molecule has resonant structures? Also, the book mentions how resonance lowers the energy of a molecule (along with delocalization) and I am a bit confused on how that is possible.

kellyz_1C

Hello this question asks to predict which atoms could be in an excited or ground state based off of its electron configurations. Are we expected to know the electron configurations for atoms that are in the excited state? Or should we just be able to recognize when atoms are not in their ground state?

kellyz_1C

I'm conufsed on how to start this question. Can anyone help me?

kellyz_1C

The question is this: A student prepared a solution of sodium carbonate by adding 2.111 g of solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (a) 2.15 mm Na+...

CHEMISTRY COMMUNITY

Search found 33 matches

Is BeO amphoteric?

Re: Strength between 2 weak/strong acids/bases

Re: Conjugate Acids and Bases

Re: Weak vs strong acids [ENDORSED]

Re: Dipole induced Dipole interaction

Re: determining dipole moment

Re: Bond Length

Re: unit box

Breaking/ Forming Bonds

Re: Ligands

Re: Ligand binding

Chelate

Re: coordination number=polydentate number?

Polydentate

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Isoelectronic elements and their characteristics

How does size affect polarizing power/ polarizability

How to tell when an molecule is resonant?

Re: Ionic and Covalent Bonds

Ionic Bonds vs Covalent Bonds

Re: lone pairs

Periodic Trends

Re: Confusion about lone pair placement

Re: polar and nonpolar molecules

Trigonal Planar vs Trigonal Pyramidal

Hybrid Orbitals

How to identify pi and sigma bonds

Resonance

HW Problem 2.39

HW Problem 1.27

Fundamentals G.5 (part a)