Search found 56 matches

by Ying Yan 1F
Fri Jan 10, 2020 5:32 pm
Forum: Ideal Gases
Topic: K value
Replies: 14
Views: 58

Re: K value

A large K value indicates that there are more prouducts present in the reaction while a small K value indicates that there are less product (and thus more reactant) present in the reaction.
by Ying Yan 1F
Fri Jan 10, 2020 5:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K expression involving solids/liquids
Replies: 7
Views: 37

Re: K expression involving solids/liquids

Solid and pure liquids cannot really react effectively with other substances and doesn't have a concentratio, therefore they are not included in the equilibrium constant equation.
by Ying Yan 1F
Fri Jan 10, 2020 5:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Le Chatelier's Principle
Replies: 7
Views: 30

Re: Le Chatelier's Principle

As the previous posts stated, Le Chatelier's principle just means that a reaction will adjust in order to go back to equilibrium.
by Ying Yan 1F
Fri Jan 10, 2020 5:20 pm
Forum: Ideal Gases
Topic: Chatelier’s Principle
Replies: 8
Views: 36

Re: Chatelier’s Principle

Le Chatelier's principle means that a reaction will adjust itself to keep its equilibrium (constant K).
by Ying Yan 1F
Thu Jan 09, 2020 11:46 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 2
Views: 12

Equilibrium Constant

This is sort of a dumb question, but what is the purpose of an equilibrium constant? Why are they useful? Thank you!
by Ying Yan 1F
Sat Dec 07, 2019 11:16 am
Forum: Hybridization
Topic: what are terminal atoms?
Replies: 2
Views: 32

what are terminal atoms?

I read from the textbook that terminal atoms are not regarded as hybridized. (i.e. the Cl molecules in PCl5) What are the definition of terminal atoms? Thank you!
by Ying Yan 1F
Fri Dec 06, 2019 7:30 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Titrations
Replies: 2
Views: 31

Re: Titrations

^Exactly, if I remember correctly, we will only start doing calculations for titrations in 14B or 14BL.
by Ying Yan 1F
Fri Dec 06, 2019 7:28 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HF
Replies: 4
Views: 41

Re: HF

^Furthermore, because F is so electronegative, the H-F bond is shorter, and make it harder for the H+ ion (aka proton) to dissociate from the HF molecule.
by Ying Yan 1F
Fri Dec 06, 2019 7:24 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH vs. pOH
Replies: 17
Views: 125

Re: pH vs. pOH

pH calculates is the amount of H+ in a solution while pOH calculates the amount of OH-. Both utilizes -log to determine their concentration, however, for pOH, you must subtract the value you get from the -log[OH-] to get the correct answer. I hope that helped!
by Ying Yan 1F
Fri Dec 06, 2019 7:20 pm
Forum: Polyprotic Acids & Bases
Topic: polyprotic v. bronsted
Replies: 3
Views: 40

Re: polyprotic v. bronsted

Yes they are, polyprotic acids/bases are simply bronsted acids/bases that can donate/accept more than one proton.
by Ying Yan 1F
Fri Dec 06, 2019 7:09 pm
Forum: Polyprotic Acids & Bases
Topic: How can you tell if an acid/base is polyprotic?
Replies: 5
Views: 56

Re: How can you tell if an acid/base is polyprotic?

Usually, if a molecule has more than one hydrogen molecule, it means it is polyprotic (I.e. H2SO4) since it shows that they are able to donate more than one proton. As for polyprotic bases, they are able to accept more than one protons, therefore, you can look out for those when you see a molecule w...
by Ying Yan 1F
Fri Dec 06, 2019 7:05 pm
Forum: Polyprotic Acids & Bases
Topic: Defintion
Replies: 11
Views: 327

Re: Defintion

Usually, if a molecule has more than one hydrogen molecule, it means it is polyprotic (I.e. H2SO4) since it shows that they are able to donate more than one proton. Hope that helps!
by Ying Yan 1F
Fri Dec 06, 2019 7:00 pm
Forum: Conjugate Acids & Bases
Topic: Homework 6.A.1 #3: Polyprotic Acids
Replies: 1
Views: 25

Re: Homework 6.A.1 #3: Polyprotic Acids

I had that same question when I was doing the homework too! I believe unless specified otherwise, I would do a monoprotic proton transfer. (But technically, you are wrong! The two molecules are polyprotic.)
by Ying Yan 1F
Fri Dec 06, 2019 6:56 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids/Bases vs. Lewis Acids/Bases
Replies: 3
Views: 28

Re: Bronsted Acids/Bases vs. Lewis Acids/Bases

805097738 wrote:So bronsted and lewis acids and bases are the same thing just described differently based off of e- or H+ action?

Exactly! Lewis and Bronsted acids/bases are kind of like the inverse of each other. I.e. Lewis acids are electron acceptors, bronsted acids are proton donors.
by Ying Yan 1F
Fri Dec 06, 2019 6:53 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Lewis Acid
Replies: 4
Views: 57

Re: Lewis Acid

Lewis acids are election acceptors, therefore since Ag+ and BF3 have the ability to accept electron, they are lewis acids. (Whereas electron donors are lewis bases.) Hope that helped!
by Ying Yan 1F
Thu Dec 05, 2019 5:13 pm
Forum: Naming
Topic: Question 9C1
Replies: 1
Views: 12

Question 9C1

In the coordinating compound [Fe(CN)6]4-, why is the name Hexacyanoferrate and not instead Hexacyano"iron-ate"?
by Ying Yan 1F
Fri Nov 22, 2019 5:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of bent
Replies: 17
Views: 84

Re: Bond Angle of bent

It really depends on how many lone pair the molecule have. If there is only one lone pair, then the angle will be slightly-less-than 120 degrees, if there are two lone pairs, then the angle will be slighty-less-than 109.5 degrees.
by Ying Yan 1F
Fri Nov 22, 2019 5:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Density Isosurface [ENDORSED]
Replies: 1
Views: 17

Density Isosurface [ENDORSED]

Is it necessary to know how density isourface and electrostatic potential surface works? (They were discussed in the textbook) Thanks!
by Ying Yan 1F
Fri Nov 22, 2019 5:22 pm
Forum: Hybridization
Topic: Valance Bond Theory
Replies: 2
Views: 21

Valance Bond Theory

Can someone please explain the valance bond theory? Thank you!
by Ying Yan 1F
Fri Nov 22, 2019 5:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped v. Trigonal pyramid
Replies: 9
Views: 58

T-shaped v. Trigonal pyramid

Just for clarification, T-shaped is 3 atoms with 2 lone pair and trigonal pyramidal is 3 atoms with 1 lone pair, correct? Thanks!
by Ying Yan 1F
Fri Nov 22, 2019 5:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bent v. angular
Replies: 20
Views: 105

Re: bent v. angular

Bent and angular is the same shape :)
by Ying Yan 1F
Wed Nov 20, 2019 1:12 pm
Forum: Hybridization
Topic: pi bond orientation
Replies: 4
Views: 33

Re: pi bond orientation

The region of electron density for an pi bond is not actually on the bond axis, but rather parallel "on top" and "below" it, creating a bean-shaped region of e- density. Therefore, if the bond rotates, the bean-shape will break because the regions of electron density are no longe...
by Ying Yan 1F
Wed Nov 20, 2019 12:57 pm
Forum: Hybridization
Topic: Test 2
Replies: 6
Views: 51

Re: Test 2

Yes, Dr. Lavell confirmed that hybridization will not be on test two :)
by Ying Yan 1F
Wed Nov 20, 2019 12:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference between Electorn arrangement and VSEPR
Replies: 5
Views: 30

Re: Difference between Electorn arrangement and VSEPR

I was confused about this too, but I later realized that the key way to distinguish between the two is that e- arrangement takes into consider the numbers of lone e- pairs and shared e- paired (aka bonds) to determine the name while VSEPR only take into consideration on the number of atoms around th...
by Ying Yan 1F
Wed Nov 20, 2019 12:48 pm
Forum: Sigma & Pi Bonds
Topic: Resonance and Sigma/Pi Bonds
Replies: 3
Views: 49

Resonance and Sigma/Pi Bonds

Someone asked this question in my lecture a few days ago, but I would like to ask about it again: What kind of bond would a resonace bond be classified as? For instance, would a molecule with a double bond resonance consider to have a pi bond or sigma bond? Thanks!
by Ying Yan 1F
Wed Nov 13, 2019 11:47 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 116

Molecular Shape Name

Is it necessary to remember the names of all the molecular shapes? I know linear, triangular planarm, tetrahedral are very common molecular shapes so it's good to remember them, but what about the other shapes such as trigonal bipyramidal, square pyramidal, etc.? Thank you!
by Ying Yan 1F
Tue Nov 12, 2019 8:55 pm
Forum: Octet Exceptions
Topic: incomplete octet
Replies: 6
Views: 50

Re: incomplete octet

Kaylee Sepulveda 3C wrote:Usually, the elements that do this are B, Al, Li, and H. B and Al will usually form compounds where they only have six electrons instead of a complete octet.

Why does B and Al exhibit this behaviour (where they don't form a complete octet)?
by Ying Yan 1F
Tue Nov 12, 2019 8:49 pm
Forum: Resonance Structures
Topic: Formal Charge Question
Replies: 15
Views: 94

Re: Formal Charge Question

For all molecular structures the atoms should have a formal charge where the molecule equal zero or equal to the charged the molecule is assigned. I hope that helps!
by Ying Yan 1F
Tue Nov 12, 2019 8:44 pm
Forum: Dipole Moments
Topic: Ep Meaning
Replies: 4
Views: 30

Re: Ep Meaning

Please correct me if I am wrong, but does VE also stand for potential energy? Thanks!
by Ying Yan 1F
Tue Nov 12, 2019 8:38 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 9
Views: 35

Re: Dissociation Energy

^ Dissociation energy is positive because energy is need to break the bond. On the other hand, when bonds are formed, energy is release and that value of energy is negative.
by Ying Yan 1F
Tue Nov 12, 2019 11:37 am
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 146

Re: Week 7 Homework

I am pretty sure we can still do homework in the Chemical Bond section, as long as it is from 2E-2F.
by Ying Yan 1F
Fri Nov 01, 2019 11:02 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 8
Views: 29

Re: Electron Affinity

Electron affinity has a similar trend to ionization energy, where it increases up and to the right. Hope that helps!
by Ying Yan 1F
Fri Nov 01, 2019 10:58 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What is the x, y, z?
Replies: 4
Views: 33

Re: What is the x, y, z?

The xyz helps to identify what position the subshell that the electron are located are in. (i.e. 2px the subshell is horizontal, 2py diagonal, and 2pz vertical) Hope that sort of helped!
by Ying Yan 1F
Fri Nov 01, 2019 10:52 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing electron configuration
Replies: 7
Views: 32

Writing electron configuration

When reaching the d block, which is the correct way to the write the electron configuration, 3d 4s or 4s 3d? I've noticed it written both ways, and it made me kind of confused. Thank you!
by Ying Yan 1F
Fri Nov 01, 2019 10:44 am
Forum: Lewis Structures
Topic: Central atom
Replies: 6
Views: 23

Central atom

When drawing lewis structures, how should I go about determining the central atom? I noticed on a lot of molecules that even though Oxygen has the higher ionization energy, Carbon or Sulfur is the central atom. Thanks!
by Ying Yan 1F
Fri Nov 01, 2019 10:41 am
Forum: Coordinate Covalent Bonds
Topic: Distinguishing a coordinate covalent bond
Replies: 5
Views: 41

Distinguishing a coordinate covalent bond

How can I distinguish that a molecule is bonded by a coordinate colvalent bond? Thanks!
by Ying Yan 1F
Thu Oct 24, 2019 1:26 pm
Forum: Resonance Structures
Topic: bond lengths
Replies: 4
Views: 40

Re: bond lengths

The bond length was 1.24 Angstrom because that molecules was exhibits resonance. The 1.24 Angstrom means that the bonds in the NO3 molecule are hybrid between a double bond and a single bond. Hope that helps!
by Ying Yan 1F
Thu Oct 24, 2019 1:20 pm
Forum: Lewis Structures
Topic: Electronegativity
Replies: 5
Views: 43

Re: Electronegativity

I believe an atom's electronegativity is relative to their ionization energy (increases from left to right and down to up of the periodic table) , so I would just follow the trend for ionization energy to determind an atom's electronegativity.
by Ying Yan 1F
Thu Oct 24, 2019 1:14 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v.covalent bonds
Replies: 7
Views: 40

Ionic v.covalent bonds

Just to clarify, the way we distinguish between whether a compund is bonded "covalently" or "ionically" is to see if the atoms in the compound are bonded metals to nonmetal(ionic) or nonmetal to nonmetal (covalent)? Sorry this is such a terribly worded question, I hope you guys c...
by Ying Yan 1F
Thu Oct 24, 2019 1:09 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 75

Re: Electronegativity

Jorge Ramirez_4H wrote:Is electronegativity important when doing electron configurations?

Not particularly, electronegativity is important for determining the bond that will form between atoms, so for drawing lewis structures but not electron configurations.
by Ying Yan 1F
Thu Oct 24, 2019 1:05 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 75

Re: Electronegativity

Electronegativity is an atom's ability to hold on to an electron. Therefore, it increases across a period because the ionization energy of an atom also increases across a period, meaning the atom is able to "hold on" to its electron better.
by Ying Yan 1F
Fri Oct 18, 2019 11:56 am
Forum: Photoelectric Effect
Topic: Spectrum of light
Replies: 6
Views: 31

Re: Spectrum of light

sbottomley3a wrote:A helpful mnemonic device to remember the order is "I saw my Grandma's X-rated Underpants Visible In My Room" (Gamma, x-ray, uv, visible, infrared, micro, radio). It's a little wacky, but it works!

Haha! This is great! Thanks for the mnemonic device
by Ying Yan 1F
Fri Oct 18, 2019 11:52 am
Forum: Properties of Light
Topic: Black Body Radiation
Replies: 2
Views: 21

Black Body Radiation

I know we've disscussed this topic a a few weeks back, but can someone clarify the idea of black body radiation? Thanks in advance!
by Ying Yan 1F
Fri Oct 18, 2019 11:47 am
Forum: Einstein Equation
Topic: why do we use these equations?
Replies: 5
Views: 58

Re: why do we use these equations?

Just from doing some problems, I believe the reason we combined the two equtions is solely dependent on the amount of information given in the problem. For instance, when we are solving for the energy of the photon, we have to combine the equation because we need/ were given wavelenght and thus need...
by Ying Yan 1F
Thu Oct 17, 2019 10:36 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 233

Re: What are the units of hertz

cycle .s-1
by Ying Yan 1F
Thu Oct 17, 2019 9:55 pm
Forum: Properties of Light
Topic: 1A.9 Energy of Photon
Replies: 12
Views: 76

1A.9 Energy of Photon

On question 1A.9 I understand that the key equation is C=(wavelength)(frequency), however the question also asks for the energy of photon, how do I calculate for that? Thank you!
by Ying Yan 1F
Fri Oct 11, 2019 6:18 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 6
Views: 90

Re: Black Body Radiation

If this helps, I associate black bodies with black holes, where, as the previous comments have already explained it emits and absorbs all frequencies of radation, just like how a black hole absorbs light and both the black holes and the black bodies are invisible. :)
by Ying Yan 1F
Fri Oct 11, 2019 6:11 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 370

Re: Ionic vs Covalent

Ionic bonds are much stronger since electrons from one atom is given to another and the two atoms basically are glued together through the bond. On the other hand, in covalent bonds the atoms are merely 50/50 sharing the electrons, therefore not as strong as an ionic bond.
by Ying Yan 1F
Fri Oct 11, 2019 6:07 pm
Forum: Properties of Light
Topic: Circular Standing Waves and electrons
Replies: 2
Views: 36

Circular Standing Waves and electrons

Can anyone clarify why circlular standing waves around the nucleus illustrates why electrons have qunatized energy states in atoms? Thank you!
by Ying Yan 1F
Fri Oct 11, 2019 5:59 pm
Forum: Significant Figures
Topic: %Mass Composition
Replies: 12
Views: 124

Re: %Mass Composition

Yeah I agree with the previous few answers, look at number that has the least amount of significant figures in the problem, but usually it is just four or five sig figs.
by Ying Yan 1F
Fri Oct 11, 2019 5:11 pm
Forum: SI Units, Unit Conversions
Topic: Showing work/ rearranging equations
Replies: 8
Views: 85

Re: Showing work/ rearranging equations

To reaffirm the previous comments, just work out the porblem in the way you are comfortable with. As long as you show how you did it, I'm sure points will be given. :)
by Ying Yan 1F
Tue Oct 01, 2019 10:32 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 455

Re: Balancing Equations [ENDORSED]

I think I can confidently say yes, since stoichiometric coefficients must be whole numbers.
by Ying Yan 1F
Tue Oct 01, 2019 10:29 pm
Forum: Balancing Chemical Reactions
Topic: Tips on what number to multiply the entire equation if needed
Replies: 8
Views: 112

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

Sorry this is reptitive of other posts, and I actually didn't know to do this before myself(!), but the best way to balance a non whole number stoichometric coefficient is to write the coeifficient in improper fractions and multiply both the reactant and product compounds by the denominator of the f...
by Ying Yan 1F
Tue Oct 01, 2019 10:17 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution and Molarity Questions
Replies: 8
Views: 51

Re: Dilution and Molarity Questions

Personally, the dilution/molarity problems that confuses me are ones with more than two compounds, and in those cases, the key to solving the problem is to find the ratios of those ions/compouds in relation tto either the other ions/elements.
by Ying Yan 1F
Tue Oct 01, 2019 9:56 pm
Forum: Significant Figures
Topic: Sig Fig Rules
Replies: 3
Views: 63

Re: Sig Fig Rules

From what I remembered, for + and -, you look at the sig figs AFTER the decimal point (i.e. 1.36 + 3.5 = 4.9 [1 sig fig after decimal point]) , while for multiplication and division, you look at the entire numbers to evaluate the sig figs (i.e. 2.51 x 6.111 = 15.3 [3 sig figs]).
by Ying Yan 1F
Tue Oct 01, 2019 9:06 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Naming Compounds (F13)
Replies: 7
Views: 81

Re: Naming Compounds (F13)

The Chlorine is actually already a compoud itself with the name Cl 2 , while chloride is the actual element Cl. So from how I interpret it, I think you would use chloride instead of chlorine in that problem is because the compoud is PCl 5 . Since the subscript on Cl is 5, we could eliminate chlorine...

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