Search found 33 matches

by kellyz_1C
Wed Jun 13, 2018 9:38 pm
Forum: Amphoteric Compounds
Topic: Is BeO amphoteric?
Replies: 2
Views: 415

Is BeO amphoteric?

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...
by kellyz_1C
Thu Jun 07, 2018 8:59 pm
Forum: Lewis Acids & Bases
Topic: Strength between 2 weak/strong acids/bases
Replies: 5
Views: 291

Re: Strength between 2 weak/strong acids/bases

strong acids and bases dissociate completely in water while weaker acids/ bases do not.
by kellyz_1C
Thu Jun 07, 2018 8:57 pm
Forum: Lewis Acids & Bases
Topic: Conjugate Acids and Bases
Replies: 4
Views: 147

Re: Conjugate Acids and Bases

conjugate acids and bases are just the forms of the acids/ bases that accepted or donated protons to the other.
by kellyz_1C
Thu Jun 07, 2018 8:55 pm
Forum: Lewis Acids & Bases
Topic: Weak vs strong acids [ENDORSED]
Replies: 7
Views: 364

Re: Weak vs strong acids [ENDORSED]

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
by kellyz_1C
Thu Jun 07, 2018 8:48 pm
Forum: Dipole Moments
Topic: Dipole induced Dipole interaction
Replies: 2
Views: 170

Re: Dipole induced Dipole interaction

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, ...
by kellyz_1C
Thu Jun 07, 2018 8:43 pm
Forum: Dipole Moments
Topic: determining dipole moment
Replies: 3
Views: 229

Re: determining dipole moment

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.
by kellyz_1C
Thu Jun 07, 2018 8:41 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 9
Views: 378

Re: Bond Length

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
by kellyz_1C
Thu Jun 07, 2018 8:38 pm
Forum: Bond Lengths & Energies
Topic: unit box
Replies: 3
Views: 193

Re: unit box

it is just a tool that helps you convert units when a problem gives you confusing/ nonconventional units
by kellyz_1C
Thu Jun 07, 2018 8:37 pm
Forum: Bond Lengths & Energies
Topic: Breaking/ Forming Bonds
Replies: 2
Views: 152

Breaking/ Forming Bonds

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?
by kellyz_1C
Thu Jun 07, 2018 8:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 120

Re: Ligands

a ligand is just a molecule or atom that binds to the central atom
by kellyz_1C
Thu Jun 07, 2018 8:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand binding
Replies: 4
Views: 143

Re: Ligand binding

a ligand can bind where a lone pair can be found (on the metal)
by kellyz_1C
Thu Jun 07, 2018 8:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 1
Views: 55

Chelate

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?
by kellyz_1C
Thu Jun 07, 2018 8:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number=polydentate number?
Replies: 5
Views: 150

Re: coordination number=polydentate number?

it is related to how many bonds the molecules can make with the central atom
by kellyz_1C
Thu Jun 07, 2018 8:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 5
Views: 257

Polydentate

How can you tell when a molecule is polydentate vs monodentate? ie; why isn't cyanide polydentate
by kellyz_1C
Wed Jun 06, 2018 12:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011277

Re: Post All Chemistry Jokes Here

How about the chemical workers… are they unionized?
by kellyz_1C
Wed Jun 06, 2018 12:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011277

Re: Post All Chemistry Jokes Here

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
by kellyz_1C
Wed Jun 06, 2018 12:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011277

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0k?
by kellyz_1C
Wed Jun 06, 2018 12:54 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic elements and their characteristics
Replies: 2
Views: 246

Isoelectronic elements and their characteristics

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...)
by kellyz_1C
Wed Jun 06, 2018 12:48 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: How does size affect polarizing power/ polarizability
Replies: 3
Views: 284

How does size affect polarizing power/ polarizability

I'm still a bit confused on how size affects these traits. Does it have something to do with electron shielding?
by kellyz_1C
Wed Jun 06, 2018 12:41 pm
Forum: Resonance Structures
Topic: How to tell when an molecule is resonant?
Replies: 7
Views: 331

How to tell when an molecule is resonant?

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
by kellyz_1C
Wed Jun 06, 2018 12:37 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 2
Views: 185

Re: Ionic and Covalent Bonds

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)
by kellyz_1C
Wed Jun 06, 2018 12:34 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds vs Covalent Bonds
Replies: 7
Views: 186

Ionic Bonds vs Covalent Bonds

In biology, we learned that covalent bonds are stronger than ionic bonds, but in chemistry, it is the opposite. How can this be?
by kellyz_1C
Wed Jun 06, 2018 12:33 pm
Forum: Ionic & Covalent Bonds
Topic: lone pairs
Replies: 2
Views: 145

Re: lone pairs

not sure what you mean by this question. lone pairs take up more space than regular bonds and are found on the central atom.
by kellyz_1C
Tue Jun 05, 2018 2:00 am
Forum: Electronegativity
Topic: Periodic Trends
Replies: 8
Views: 215

Periodic Trends

Are there any exceptions (of elements) that we will have to know that do not follow the general trends of electronegativity/ electron affinity?
by kellyz_1C
Tue Jun 05, 2018 1:52 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Confusion about lone pair placement
Replies: 2
Views: 120

Re: Confusion about lone pair placement

you should place the lone pairs in locations that maximize the space between them since they take up a lot of space.
by kellyz_1C
Tue Jun 05, 2018 1:51 am
Forum: Determining Molecular Shape (VSEPR)
Topic: polar and nonpolar molecules
Replies: 5
Views: 172

Re: polar and nonpolar molecules

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
by kellyz_1C
Tue Jun 05, 2018 1:48 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar vs Trigonal Pyramidal
Replies: 5
Views: 2603

Trigonal Planar vs Trigonal Pyramidal

How can you tell the difference between molecules that are trigonal planar vs trigonal pyramidal?
by kellyz_1C
Tue Jun 05, 2018 1:46 am
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 5
Views: 212

Hybrid Orbitals

Do we need to know how to identify hybrid orbitals that contain orbitals past the d orbital?
by kellyz_1C
Thu May 31, 2018 3:43 am
Forum: Hybridization
Topic: How to identify pi and sigma bonds
Replies: 4
Views: 157

How to identify pi and sigma bonds

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?
by kellyz_1C
Thu May 24, 2018 3:47 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance
Replies: 7
Views: 264

Resonance

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.
by kellyz_1C
Wed May 09, 2018 3:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Problem 2.39
Replies: 2
Views: 136

HW Problem 2.39

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?
by kellyz_1C
Wed Apr 25, 2018 5:35 pm
Forum: Einstein Equation
Topic: HW Problem 1.27
Replies: 1
Views: 168

HW Problem 1.27

I'm conufsed on how to start this question. Can anyone help me?
by kellyz_1C
Tue Apr 10, 2018 8:19 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals G.5 (part a)
Replies: 1
Views: 93

Fundamentals G.5 (part a)

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+...

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