Search found 33 matches

by 405335722
Fri Nov 08, 2019 11:08 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Water molecules
Replies: 8
Views: 250

Re: Water molecules

Water molecules use both hydrogens for hydrogen bonding.

But always remember, hydrogen bonding is always with the elements F, O, and N

F, O, and N always have to have a lone pair for there to be any hydrogen bonding
by 405335722
Fri Nov 08, 2019 11:06 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability vs Polarizing Power
Replies: 15
Views: 53

Re: Polarisability vs Polarizing Power

Also, a trend that goes with it.

Atoms that are larger (and therefore have more electrons) are more Polarizable.

Atoms that are smaller (and have fewer electrons) have more Polarizing Power.
by 405335722
Fri Nov 08, 2019 11:04 am
Forum: Formal Charge and Oxidation Numbers
Topic: Which lewis structure will make the dominant contribution to a resonance hybrid?
Replies: 5
Views: 27

Re: Which lewis structure will make the dominant contribution to a resonance hybrid?

Structures with a charge are more likely to contribute to a resonance hybrid because the electrons are delocalized in resonance hybrids.
by 405335722
Fri Nov 08, 2019 11:03 am
Forum: Octet Exceptions
Topic: Lewis Acids and Bases?
Replies: 11
Views: 47

Re: Lewis Acids and Bases?

Michelle Xie 3A wrote:A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.

What is the acid/base name for the definition that says it donates/accepts protons? Is that a Bronsted acid/base?
by 405335722
Fri Nov 08, 2019 11:00 am
Forum: Administrative Questions and Class Announcements
Topic: Homework
Replies: 2
Views: 19

Re: Homework

Yes, I believe it can be. Whatever we are doing in class is allowed for homework problems.
by 405335722
Fri Nov 08, 2019 10:58 am
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 6
Views: 24

Re: Polarizability

Yes! You are correct. Polarizability increases as molecular mass increases because, as molar mass increases so does the number of electrons in an atom. The more electrons there are, the more polarizability an atom has.
by 405335722
Tue Nov 05, 2019 3:35 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic vs Molecular Spectroscopy
Replies: 1
Views: 23

Atomic vs Molecular Spectroscopy

what is the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)?
by 405335722
Fri Nov 01, 2019 2:21 pm
Forum: Trends in The Periodic Table
Topic: Noble Gases
Replies: 10
Views: 20

Re: Noble Gases

noble gasses are just, VERY special :)
by 405335722
Fri Nov 01, 2019 2:20 pm
Forum: Octet Exceptions
Topic: More than 8 e-
Replies: 3
Views: 15

Re: More than 8 e-

having an EMPTY d shell allows for an expanded octet because there is space for more electrons. In contrast, atoms without an empty d orbital cant form expanded octets because there are no shells for the electrons to go in
by 405335722
Fri Nov 01, 2019 2:18 pm
Forum: Ionic & Covalent Bonds
Topic: Transition Metals
Replies: 3
Views: 16

Re: Transition Metals

a lot of them have different charges so usually, they will specify in the problem

like iron has a +2 +3 and +4 charge it just depends on the reaction
by 405335722
Fri Nov 01, 2019 2:11 pm
Forum: Lewis Structures
Topic: Expanded Valence Shells
Replies: 4
Views: 17

Re: Expanded Valence Shells

it depends on how many empty d or p orbitals there are to determine how many times it can expand an octet.

I dont think it is only empty d orbitals because sulfur can become an expanded octet and it deosnt have an empty d orbital only a p orbital to "tap into"
by 405335722
Fri Nov 01, 2019 2:09 pm
Forum: Trends in The Periodic Table
Topic: Calculating Ionization Energy
Replies: 1
Views: 17

Re: Calculating Ionization Energy

Work function is also known as threshold energy which is the amount of energy needed to remove an electron from a metal. So, it is similar to ionization energy but ionization energy is with elements in the gas ohase while this equation with work function is with metals
by 405335722
Fri Nov 01, 2019 2:07 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 4
Views: 33

Re: Resonance

They are also more reactive beacuse the electrons have so many possibilities of where they could be at one time. The fancy word for it is delocalization but it makes more sense to me by thinking of it as in we just dont know where they could be because there are multiple favorable structures
by 405335722
Fri Oct 25, 2019 11:32 am
Forum: Trends in The Periodic Table
Topic: Electron Affinty
Replies: 5
Views: 18

Re: Electron Affinty

As you move across a period, atoms have higher electron affinity because they want to fill their valence shell. For example, Lithium is less likely to gain an electron because they want to "get rid of" the one they already have in their 2s shell versus Fluorine that wants an electron to co...
by 405335722
Fri Oct 25, 2019 11:28 am
Forum: Lewis Structures
Topic: Exceptions to the Octet Rule
Replies: 2
Views: 18

Re: Exceptions to the Octet Rule

Phosphorus, Chloride, and Sulfur are all exceptions to the Octet Rule and can all, therefore, have an expanded octet.
This is because, they have that 2p orbital to "tap into" unlike elements such as Oxygen, Nitrogen, and Flouride.
by 405335722
Fri Oct 25, 2019 11:25 am
Forum: Lewis Structures
Topic: Bond strength
Replies: 7
Views: 31

Re: Bond strength

ionic bonds are stronger than covalent bonds

but, covalent network bonds are the strongest of all bonds and include compounds like diamond and graphite
by 405335722
Fri Oct 25, 2019 11:19 am
Forum: Resonance Structures
Topic: Delocalization
Replies: 2
Views: 22

Re: Delocalization

Electrons are delocalized when there is resonance in the structure of the molecule. Delocalization means the electron isn't bound to stay in one subshell, instead it can "move around" from subshell to subshell per se. That is why we draw all the possible structures when we draw resonance b...
by 405335722
Fri Oct 25, 2019 11:14 am
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 12
Views: 72

Re: Resonance

Their delocalized electrons also give them a lower activation energy which makes them more stable.
by 405335722
Fri Oct 18, 2019 11:44 am
Forum: Properties of Light
Topic: Where to find equations?
Replies: 5
Views: 31

Re: Where to find equations?

what I always do in the back of my notebook is write down all the equations we learn because some aren't on the constants sheet!:)
by 405335722
Fri Oct 18, 2019 11:42 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 53
Views: 189

Re: Best Way To Study?

2 words...

KAHN. ACADEMY.

especially for equilibrium and acids and bases!!
by 405335722
Fri Oct 18, 2019 11:35 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin State
Replies: 6
Views: 37

Re: Spin State

So, spin states depend on how many electrons you have in one orbital. for example, lets say we are dealing with the P orbital which has 3 basically domains (Px, Py, and Pz) each electron can be in. When adding electrons to a system, one must distribute each electron to Px Py and Pz BEFORE adding 2 e...
by 405335722
Fri Oct 18, 2019 11:28 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum number n, l, m
Replies: 13
Views: 69

Re: quantum number n, l, m

Can someone please explain what Px, Py, Pz are and how they relate to -1,0,1? Px Py and Pz are the different parts of an orbital that an electron can occupy. the quantum number "m" refers to the specific electrons within an orbital shell. they are basically the same thing so -1,0,1 is the...
by 405335722
Fri Oct 18, 2019 11:25 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: p- and d- orbitals and zero e- density
Replies: 5
Views: 19

Re: p- and d- orbitals and zero e- density

To explain the symmetry aspect (I am confused about the density part as well), the s orbital has symmetry because it is in the shape of a sphere so any way you cut it/look at it, it will be the same meaning the electrons will be in that vicinity the p and d orbitals do not have symmetry because thei...
by 405335722
Thu Oct 10, 2019 8:55 pm
Forum: Limiting Reactant Calculations
Topic: percent yield
Replies: 10
Views: 89

Re: percent yield

Hi!

You can only do percent yield problems if they give you the experimental data so if they give it to you I would do it just in case.

Remember percent yield is,

100(actual yield/theoretical yield)= percent yield.
by 405335722
Thu Oct 10, 2019 8:47 pm
Forum: Student Social/Study Group
Topic: Pen or Pencil for Homework Problems?
Replies: 8
Views: 59

Re: Pen or Pencil for Homework Problems?

Because we have to take tests in pen I do homework and notes in pen so I get used to working around mistakes. It also makes me do my work slower and more diligently since I don't want to mess up in pen
by 405335722
Thu Oct 10, 2019 8:43 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 66
Views: 926

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

KatherineValdez_4B wrote:So we can get partial credit if we show our work and we have the right idea, but mess up the calculations?


yes I remember my TA saying we get partial credit for calculations and showing work.
by 405335722
Thu Oct 10, 2019 8:40 pm
Forum: Limiting Reactant Calculations
Topic: Test 1 Calculator
Replies: 6
Views: 71

Re: Test 1 Calculator

There are also lots of calculators that have periodic tables inside and different chemistry programs with conversions.
by 405335722
Thu Oct 10, 2019 8:38 pm
Forum: Properties of Electrons
Topic: Constructive and Destructive Interference
Replies: 4
Views: 49

Re: Constructive and Destructive Interference

Hello! Constructive interference occurs when two different waves are acting IN phase and the result is more energy. Destructive interference occurs when two different waves are acting OUT OF phase and the result is less energy. Waves are in phase when their troughs and peaks match up and they are ou...
by 405335722
Tue Oct 01, 2019 1:13 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 264

Re: Ionic vs Covalent

covalent network are the strongest (ex. diamond and graphite) are stronger than ionic however covalent bonds themselves are usually weaker than ionic bonds.
by 405335722
Tue Oct 01, 2019 1:11 pm
Forum: Significant Figures
Topic: Sig Fig Decimal
Replies: 10
Views: 74

Re: Sig Fig Decimal

They would be the same thing! Only if the number in the ones place was a zero would you need a decimal to include it in your sig figs.

ex.
114 - 3 sig figs
110 - 2 sig figs
110. - 3 sig figs
by 405335722
Tue Oct 01, 2019 1:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013915

Re: Post All Chemistry Jokes Here

I love to tell chemistry jokes!! But I only get a reaction periodically...
by 405335722
Tue Oct 01, 2019 1:07 pm
Forum: Balancing Chemical Reactions
Topic: Tips on what number to multiply the entire equation if needed
Replies: 8
Views: 79

Re: Tips on what number to multiply the entire equation if needed

It is easiest to write your decimal number as a fraction so you can just divide by the denominator and make every coefficient and integer! I hope this helps.
by 405335722
Tue Oct 01, 2019 1:06 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding [ENDORSED]
Replies: 12
Views: 109

Re: Rounding [ENDORSED]

Hello! I usually round with the consideration of sig figs. So, when multiplying or dividing, you always round to the least specific place (ex. 10.0/1 would just have one sig fig because "1" is the least specific). I usually round according to sig figs during the entire problem so I get in ...

Go to advanced search