Search found 81 matches

by Diana_Diep2I
Wed Jan 22, 2020 8:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Acids and Bases
Replies: 6
Views: 36

Re: Acids and Bases

No we don't. Dr. Lavelle said that polyprotic acids required multiple steps for each time the acid donates a proton.
by Diana_Diep2I
Wed Jan 22, 2020 8:23 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6D 15b
Replies: 2
Views: 7

Re: 6D 15b

Ka should be in a table in the book. This problem tests 14A material. You're supposed to know that Al3+ can serve as a metal cation that can have multiple bonds (coordination compounds)
by Diana_Diep2I
Wed Jan 22, 2020 8:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 2
Views: 4

Re: Approximation

You can check the percent protonation to see if it's less than 5%. You can also check the Ka/Kb value. if the value is less than 10^-3, you can almost safely approximate.
by Diana_Diep2I
Wed Jan 22, 2020 8:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Box vs just solving
Replies: 2
Views: 10

Re: ICE Box vs just solving

Use the ICE box for when the problem asks for something like the pH or pOH of a weak acid/base and you have to find the concentration of the H3O+/OH-. Or, when the problem asks for the equilibrium compositions of the reaction. Then you'd have to find the concentrations for the reactants using the IC...
by Diana_Diep2I
Wed Jan 22, 2020 8:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G5
Replies: 1
Views: 9

5G5

Can someone explain the difference between the third and fourth flask in this problem?
by Diana_Diep2I
Tue Jan 21, 2020 9:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 1
Views: 17

Re: Autoprotolysis

If [H3O+] < 10^-7, then the solution is considered neutral because we know that autoprotolysis generates 10^-7 M H3O+
by Diana_Diep2I
Thu Jan 16, 2020 5:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Negative pH
Replies: 6
Views: 18

Re: Negative pH

You get a negative pH when the concentration provided is greater than 1
by Diana_Diep2I
Thu Jan 16, 2020 5:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: weak acids and weak bases
Replies: 3
Views: 11

Re: weak acids and weak bases

I'm not exactly sure what kind of calculations you are talking about You would have to use an ICE chart, with Ka and Kb. The problem would most likely ask for the pH/pOH and the concentrations of H3O+/OH-.
by Diana_Diep2I
Tue Jan 14, 2020 6:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and exothermic reactions
Replies: 11
Views: 33

Endothermic and exothermic reactions

Can someone explain why endothermic reactions favor product formation while exothermic reactions favor reactant formation? I don't understand how the graphs and delta H relate to the concept when explaining product/reactant formation.
by Diana_Diep2I
Tue Jan 14, 2020 4:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.16
Replies: 2
Views: 23

Re: 5I.16

Yeah, I was wondering if K would just equal to the total pressure (7.68) bar? Since solids and liquids are not included in the constant expression?
by Diana_Diep2I
Tue Jan 14, 2020 4:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5l.13
Replies: 2
Views: 39

Re: 5l.13

Create an ICE chart for the reaction Cl2-->2Cl (it's in the table 5G2). You will find the equilibrium compositions of Cl2 and Cl using the given Kc at 1000 K. Do the same thing for F2. Compare the concentrations you find between Cl2 and Cl/F2 and F. If the concentration of the reactant is greater th...
by Diana_Diep2I
Tue Jan 14, 2020 4:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B.9 Hw problem
Replies: 3
Views: 39

Re: 6B.9 Hw problem

I think we get that when the pH scale exceeds 14. This usually occurs when the molarity or concentration of H3O+ or OH- is greater than 1.
by Diana_Diep2I
Fri Jan 10, 2020 10:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Today's Lecture
Replies: 3
Views: 22

Re: Today's Lecture

The proper explanation was the comparison of Q to K, where the concentration doubled due to the volume being halved. When the concentration doubled and we found Q(this is before we wait for the system to return to equilibrium), we found that Q<K. And when Q<K, the reaction shifts to the right.
by Diana_Diep2I
Fri Jan 10, 2020 9:50 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: predicting effects
Replies: 8
Views: 23

Re: predicting effects

I think because it's on the products side, removing one of the products would increase the production of both compounds (NO and SO3)?
by Diana_Diep2I
Thu Jan 09, 2020 12:57 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q vs K
Replies: 8
Views: 45

Re: Q vs K

Q is for when the reaction isn't at equilibrium. K is for when the reaction is at equilibrium.
by Diana_Diep2I
Thu Jan 09, 2020 12:55 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K expression
Replies: 6
Views: 30

Re: K expression

There technically isn't a concentration for a solid b/c it doesn't make sense. We're measuring the change in concentration of compounds in K. As for pure liquids, the concentration isn't changed much. The change is negligible it's practically 0. So if we put something like the concentration of water...
by Diana_Diep2I
Thu Jan 09, 2020 12:51 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G3
Replies: 8
Views: 24

5G3

Do we include H2O in the gas phase? I know we don't include it in the liquid phase but I am unsure about gas.
by Diana_Diep2I
Thu Jan 09, 2020 12:50 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K being small or large
Replies: 4
Views: 19

Re: K being small or large

Like the post above me said, the reaction favors the reactants if K is small. The reactants are more stable. If K is big, the reaction favors the products and the products are more stable.
by Diana_Diep2I
Sat Dec 07, 2019 2:09 pm
Forum: Dipole Moments
Topic: Dipole Moments Cancel in Tetrahedral?
Replies: 5
Views: 36

Re: Dipole Moments Cancel in Tetrahedral?

If you draw the tetrahedral lewis structure in its actual shape, you would see that they would not cancel due to the vectors pointing upwards or downwards. The structure does not have bond angles of 90º. There would be a net dipole going up or down. For example, CH2Cl2 would still be polar and like ...
by Diana_Diep2I
Tue Dec 03, 2019 8:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles of compounds with different atoms
Replies: 2
Views: 23

Re: Bond angles of compounds with different atoms

I'm not sure if it has what I'm asking. I'm asking if having different atoms surrounding the central atom affects the bond angles?
by Diana_Diep2I
Tue Dec 03, 2019 12:15 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles of compounds with different atoms
Replies: 2
Views: 23

Bond angles of compounds with different atoms

What would the bond angle of COH3 be? I know that it is a tetrahedral structure, but would the bond angle be any different due to the oxygen atom?
by Diana_Diep2I
Mon Dec 02, 2019 10:56 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Oxides of main group elements
Replies: 2
Views: 26

Oxides of main group elements

Are oxides of main group elements considered bases? Or do they have to react with water to form bases/acids? For example, Na2O has to react with H2O to form NaOH. Is Na2O considered a base? Or is it the NaOH?
by Diana_Diep2I
Mon Dec 02, 2019 10:11 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: HW 6D11
Replies: 2
Views: 45

Re: HW 6D11

Sorry I forgot to mention that you should look for the strong conjugate acids/bases that come from weak acids/bases. Like for example in a) NH4Br, Br- is a weak conjugate base of the strong acid HBr so it doesn't affect the pH and you shouldn't pay attention to that. NH4+ on the other hand, is a str...
by Diana_Diep2I
Mon Dec 02, 2019 10:05 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: HW 6D11
Replies: 2
Views: 45

Re: HW 6D11

In c), F- is the anion of a weak acid (HF). In lecture today we learned that the conjugate base of a weak acid will raise the pH of the solution by removing protons from water to generate OH-. As a result, the pH will be >7. e) Al3+ is the transition metal that is hydrated and has strong e- withdraw...
by Diana_Diep2I
Fri Nov 29, 2019 2:34 pm
Forum: Hybridization
Topic: #2F16
Replies: 1
Views: 14

#2F16

In problem 2F16, it asks if the N2px orbital participates in hybridization for NH2+ and NH2- if the 2px orbital is lying perpendicular to the plane of the molecule. I am not quite sure as to how to answer this question. How do I know if a particular orbital participates in a hybridization?
by Diana_Diep2I
Wed Nov 27, 2019 4:08 pm
Forum: Biological Examples
Topic: EDTA
Replies: 8
Views: 51

Re: EDTA

It is ethylene-diamine-tetra-acetate and it removes metals from the blood by chelating or binding to cations, aka metals. It has six binding sites(2 amino-nitrogen atoms and 4 carboxylic groups)
by Diana_Diep2I
Wed Nov 27, 2019 4:04 pm
Forum: Naming
Topic: OH2 vs H2O Coordination Complex Chemical Formula
Replies: 3
Views: 21

Re: OH2 vs H2O Coordination Complex Chemical Formula

There really is no difference between the two as both are water, but it is most likely to show that it is oxygen that binds to the complex and not the hydrogen. The formula OH2 gives a more accurate depiction of the structure just like how Dr. Lavelle reversed NH3 and H3N during lecture.
by Diana_Diep2I
Wed Nov 27, 2019 3:51 pm
Forum: Naming
Topic: 9C.3
Replies: 6
Views: 47

Re: 9C.3

The order in which you put your ligands does not matter, but the naming process matters because then you have to take into account alphabetical order.
by Diana_Diep2I
Wed Nov 27, 2019 3:46 pm
Forum: Naming
Topic: HW 9c.9
Replies: 4
Views: 31

Re: HW 9c.9

6 because en has two binding sites. Because it is a bidentate and there are two of them, it binds at four sites. Add the four to the two Cl sites and you get 6.
by Diana_Diep2I
Wed Nov 27, 2019 3:16 pm
Forum: Lewis Acids & Bases
Topic: Bronsted and Lewis Acids
Replies: 4
Views: 24

Bronsted and Lewis Acids

What is the difference between Bronsted and Lewis acids and bases?
by Diana_Diep2I
Sat Nov 23, 2019 2:59 pm
Forum: Naming
Topic: #9C3 d
Replies: 2
Views: 48

#9C3 d

How come bisoxalato comes before diaqua in the name? For reference, the name of the complex is sodium bisoxalato(diaqua)ferrate(III). I thought we were supposed to ignore the greek prefixes and only pay attention to the ligand itself?
by Diana_Diep2I
Wed Nov 20, 2019 6:56 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F.19
Replies: 5
Views: 41

Re: 3F.19

doesn't the strength of london disperson forces take priority over dipole-dipole forces when determining which compound has a higher boiling point? Not really. You have to first compare IMF strength before comparing different London dispersion force factors like size or number of electrons. In this...
by Diana_Diep2I
Tue Nov 19, 2019 12:05 am
Forum: Dipole Moments
Topic: 2E30
Replies: 1
Views: 25

2E30

Question 2E30b asks which molecule has the largest dipole moment and I am conflicted between 1 and 3. Can someone help? Thanks!
by Diana_Diep2I
Mon Nov 18, 2019 10:34 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: ion dipole interactions
Replies: 3
Views: 25

Re: ion dipole interactions

Yes. The phrase "like dissolves like" basically means that polar molecules dissolve in polar molecules, or anything with a charge basically. Because Cl- ion has a negative charge, it will be hydrated. But something like C6H6 cannot dissolve in water or polar substances because it is a nonp...
by Diana_Diep2I
Mon Nov 18, 2019 10:32 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: hydrogen bonds
Replies: 4
Views: 17

Re: hydrogen bonds

Yes they are considered a special dipole-dipole interaction. For example, (HF interacting with NH). However, it is considered stronger than other dipole-dipole interactions.
by Diana_Diep2I
Sat Nov 16, 2019 8:17 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Size and Electronegativity difference
Replies: 3
Views: 43

Size and Electronegativity difference

When do we look at size and when do we look at electronegativity difference when it comes to checking to see which molecule has the higher boiling point? For example, H2S vs H2Se or SiH4 vs SiF4. Do I look at the electronegativity or the size/polarizability of the molecule?
by Diana_Diep2I
Sat Nov 16, 2019 7:56 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Potential energy
Replies: 1
Views: 22

Potential energy

Can someone explain to me what exactly potential energy is between interacting molecules?
by Diana_Diep2I
Thu Nov 14, 2019 11:53 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Polar Vs Nonpolar
Replies: 7
Views: 44

Polar Vs Nonpolar

How can we tell if a molecule is polar or nonpolar? For example: CH2Cl2. How would I be able to find the forces that occur between that molecule besides London forces?
by Diana_Diep2I
Thu Nov 14, 2019 11:43 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion-Dipole
Replies: 2
Views: 36

Re: Ion-Dipole

I get what the post above is saying, but what does "extent of hydration" mean? Is it like how many H2O molecules the ion attracts?
by Diana_Diep2I
Thu Nov 14, 2019 11:40 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: question concerning london dispersion forces and molecular formula
Replies: 2
Views: 19

Re: question concerning london dispersion forces and molecular formula

The "increase in mass" actually refers to the increase in C and H atoms because an increase in mass means an increase in the number of electrons. So actually it does not have much to do with the actual mass but rather the increase in the number of electrons when you add C and H. This cause...
by Diana_Diep2I
Thu Nov 14, 2019 11:01 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Electronegativity and Diplole Moments
Replies: 2
Views: 13

Re: Electronegativity and Diplole Moments

In addition to the post above me, this gives rise to intermolecular interactions. The partial charges on the molecules can induce dipoles on other molecules.
by Diana_Diep2I
Thu Nov 14, 2019 10:59 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: London vs Dipole induced dipole
Replies: 2
Views: 14

London vs Dipole induced dipole

I know in lecture that Dr. Lavelle said that London interactions and dipole-induced dipoles were similar and interchanged, but the book says that London forces are between nonpolar molecules while dipole-induced dipoles were between a polar molecule and a nonpolar molecule. Which is it?
by Diana_Diep2I
Fri Nov 08, 2019 9:55 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Water molecules
Replies: 9
Views: 280

Re: Water molecules

It uses both of its hydrogens to form hydrogen bonds with other water molecules but keep in mind that these are not actual bonds. They are interactions between the oxygen atom and the hydrogen atom.
by Diana_Diep2I
Fri Nov 08, 2019 9:51 am
Forum: Photoelectric Effect
Topic: Midterm 1
Replies: 9
Views: 109

Re: Midterm 1

Emily_4B wrote:Do you guys know if we’ll get the midterm back or be able to look at it in office hours to review this question?

I was told that we would get our midterm back next Wednesday during lecture.
by Diana_Diep2I
Fri Nov 08, 2019 9:46 am
Forum: Hybridization
Topic: Pi bonds
Replies: 8
Views: 273

Re: Pi bonds

605110118 wrote:What is the difference between pi and sigma?

sigma is all single bonds and pi is the second bond in a double bond
by Diana_Diep2I
Fri Nov 08, 2019 9:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge
Replies: 9
Views: 473

Re: Formal Charge

VioletKo3F wrote:What's the equation for the formal charge?

V-(L+S/2) where V is for valence electrons, L is for number of lone electrons, and S is for number of shared electrons.
by Diana_Diep2I
Fri Nov 08, 2019 9:41 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability vs Polarizing Power
Replies: 15
Views: 110

Re: Polarisability vs Polarizing Power

To add to the replies above, a large anion is usually polarizable because the outer electrons are further from the nucleus and are more likely to feel less of an effective nuclear charge. Meanwhile, a small cation has more polarizing power because of its stronger nuclear charge.
by Diana_Diep2I
Fri Nov 08, 2019 9:36 am
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 107

Re: Double bond

How would a double bond help stabilize a structure? In most cases, it would help reduce the formal charge of the atom to 0. For example, oxygen with a single bond and 3 lone pairs has a formal charge of -1. But if you change its bond to a double bond with two lone pairs, it will have a formal charg...
by Diana_Diep2I
Sat Nov 02, 2019 2:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Help Calculating
Replies: 3
Views: 57

Re: Help Calculating

1) manipulate your equation so that you are solving for ΔX. 2) ΔP is equal to mΔv because mass is constant and velocity is the only thing that changes. Set up the equation Δp=mΔv on the side to solve for Δp. 3) multiply your given velocity by 2 so that you get the entire error and not just one part ...
by Diana_Diep2I
Thu Oct 31, 2019 10:56 am
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 107

Re: Double bond

Yes, like the answer above me said, you use double bonds to get the formal charge to 0. For example, if you have an oxygen atom bonded by a single atom with three lone pairs, you would not have a formal charge of 0 for oxygen. What you can do to fix that is change the single bond to a double bond an...
by Diana_Diep2I
Thu Oct 31, 2019 10:54 am
Forum: Resonance Structures
Topic: C4H4
Replies: 2
Views: 19

C4H4

In C4H4, the book says to arrange the carbon atoms in a square, but why can't we draw them in a carbon line? The formal charges are the same in the square molecule and the chain.
by Diana_Diep2I
Thu Oct 31, 2019 10:50 am
Forum: Lewis Structures
Topic: Structures of bigger compounds
Replies: 1
Views: 42

Structures of bigger compounds

Are we going to be expected to know how to arrange the more complicated molecules like C(NH2)3+ and H2C(NH2)COOH? I know the basic rule is to arrange them as symmetrically as possible and to arrange the atoms according to how they're grouped in the molecule, but this is just a question for the midte...
by Diana_Diep2I
Thu Oct 31, 2019 10:45 am
Forum: Properties of Light
Topic: All the formulas
Replies: 5
Views: 61

Re: All the formulas

Not sure if this is what you're looking for but... c = \lambda \nu E(photon) = h \nu \frac{1}{2} m* v^{2} = E(photon) - \phi \lambda = h/p Could you explain wavelength = h/p to me please? That is de Broglie's wavelength equation, where he states that anything with a mass exhibits wavelike behavior....
by Diana_Diep2I
Thu Oct 31, 2019 10:19 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Work function units
Replies: 5
Views: 38

Work function units

Are work function units always supposed to be in Joules? So we convert if we're given kJ/mol like in the practice midterm questions right?
by Diana_Diep2I
Thu Oct 31, 2019 10:17 am
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 3
Views: 24

Re: Octet Exception

No you don't have to memorize all the octet exceptions, but you should have a good idea of which atoms need to form an octet and which ones don't. Just know that elements in the 3p group can have more than 8 electrons bc they now have space in the d block. Prof. Lavelle also specifically mentioned t...
by Diana_Diep2I
Sat Oct 26, 2019 9:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Pd electron configuration
Replies: 1
Views: 7

Pd electron configuration

How come the electron configuration for Palladium is [Kr]4d10 and not [Kr]4d8 5s2? And how come platinum's (same group as palladium) electron configuration is [Xe]4f14 5d9 6s1? Is there a rule that we are supposed to follow for these configurations?
by Diana_Diep2I
Wed Oct 23, 2019 1:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for Cerium
Replies: 2
Views: 14

Electron configuration for Cerium

Why is the electron configuration for Cerium [Xe]4f15d16s2? Isn't it the second element in the f block?
by Diana_Diep2I
Wed Oct 23, 2019 1:24 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 4
Views: 30

Bond lengths

I don't understand the different bond lengths not existing as actual different bond lengths? So does it mean that hypothetically the bonds in NO3- should be 1.20 A and 1.40 A, but in real life the bond lengths of the resonance structures are 1.24 A? Does the molecule exist as a kind of superposition...
by Diana_Diep2I
Wed Oct 23, 2019 1:15 pm
Forum: DeBroglie Equation
Topic: Velocity
Replies: 13
Views: 135

Re: Velocity

You should double check when you have an unreasonable velocity. But like we did in the example problem, it could indicate that the atom's size was too small because the entire point of that problem was to show that there was a limit to how small an atom could be. Usually, atoms have a diameter of 10...
by Diana_Diep2I
Wed Oct 23, 2019 1:11 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 5
Views: 26

Re: Electron affinity

The elements in the top right easily accept electrons due to them having the tendency to become more stable (8e-). So if fluorine has 7e- it would easily accept an additional e- bc having 8e- would make it more stable. Whereas elements like Na+ would have a lower electron affinity because adding an ...
by Diana_Diep2I
Tue Oct 22, 2019 2:20 pm
Forum: Photoelectric Effect
Topic: Intensity of Light
Replies: 4
Views: 34

Re: Intensity of Light

This is shown in the equation, E=hv. Energy of the photon is affected by the frequency and not the intensity. If there is not enough energy (frequency is not high enough) then e- wouldn't be emitted.
by Diana_Diep2I
Sat Oct 19, 2019 3:06 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisengberg Uncertainty Equation Meaning
Replies: 7
Views: 38

Re: Heisengberg Uncertainty Equation Meaning

In the Heisenberg equation, what number would you plug in for delta X? and what does X stand for? The delta X would be the space that the electron is confined in, so its position could be anywhere within that space. For example, in problem 1B25, it gives us the info where the diameter of the lead a...
by Diana_Diep2I
Wed Oct 16, 2019 2:39 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.25
Replies: 4
Views: 52

Re: 1B.25

Sydney Myers 4H wrote:I'm confused about this one as well, particularly on how a one-dimensional box can even exist?? Boxes are two-dimensional right?

I think the box is drawn as a square, hence 1 dimensional.
by Diana_Diep2I
Tue Oct 15, 2019 12:08 am
Forum: *Shrodinger Equation
Topic: Hamiltonian
Replies: 1
Views: 17

Hamiltonian

Do we take into account the negative values for double derivatives? Prof. Lavelle said the double derivative of sin(theta) was sin(theta), but isn't there a negative?
by Diana_Diep2I
Tue Oct 15, 2019 12:06 am
Forum: *Shrodinger Equation
Topic: Wave Function
Replies: 2
Views: 26

Wave Function

What did Prof. Lavelle mean when he said that the psi sign was a wave function? So the psi is representative of an equation that we haven't learned yet?
by Diana_Diep2I
Tue Oct 15, 2019 12:04 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.25
Replies: 2
Views: 17

Re: 1B.25

They just used the shorthand with the slashed h. Otherwise, the problem setup is the same. 1)You set up Heisenberg's principle 2)divide change in position aka the diameter of the atom 3)it asks for uncertainty in velocity, so you change the p in momentum to mΔv 4)divide the mass by both sides to get...
by Diana_Diep2I
Sun Oct 13, 2019 2:46 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 6
Views: 77

Re: Photoelectric Effect

When the energy of the photon is exactly the same as the threshold energy, the electron is still ejected, but it has zero kinetic energy. To my understanding, the electron is able to be ejected, but there is no residual energy present for kinetic energy. So I suppose the electron would be ejected, ...
by Diana_Diep2I
Tue Oct 08, 2019 10:33 am
Forum: DeBroglie Equation
Topic: How to know which equation to use
Replies: 9
Views: 120

Re: How to know which equation to use

And isn't it also whatever value is given? Is there an example problem that you have?
by Diana_Diep2I
Tue Oct 08, 2019 10:27 am
Forum: DeBroglie Equation
Topic: How to know which equation to use
Replies: 9
Views: 120

Re: How to know which equation to use

We can only use v=c/wavelength if you're trying to find the frequency of light
by Diana_Diep2I
Tue Oct 08, 2019 10:22 am
Forum: Empirical & Molecular Formulas
Topic: Test 1 Outline Question
Replies: 4
Views: 74

Re: Test 1 Outline Question

Hi, can I ask where you got the Test 1 Outline from? Thanks!
by Diana_Diep2I
Tue Oct 08, 2019 10:19 am
Forum: *Black Body Radiation
Topic: Black Body
Replies: 5
Views: 50

Re: Black Body

A black body only absorbs. I think it's like being in a dark room, where you can't see anything because it is all black and nothing is reflected. A white body reflects
by Diana_Diep2I
Tue Oct 08, 2019 10:15 am
Forum: Properties of Light
Topic: Light intensity
Replies: 6
Views: 58

Re: Light intensity

I'm not sure if this is the answer you're looking for but in terms of wave properties, higher intensity means that the amplitudes of the waves are higher. However, wavelength remains the same compared to higher frequency, where the wavelength is decreased. And he also said that if light only had wav...
by Diana_Diep2I
Sat Oct 05, 2019 6:21 pm
Forum: Molarity, Solutions, Dilutions
Topic: G16
Replies: 1
Views: 28

G16

For problem G16, it gives us 0.033 g of CuSo4•5H2O but asks for the molarity of CuSO4. I was wondering if I should isolate and use the mass of CuSO4 in my calculations instead of the given mass of CuSo4•5H2O. There is hardly a difference in the answer, but should I isolate it for the sake of showing...
by Diana_Diep2I
Wed Oct 02, 2019 5:54 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Question
Replies: 4
Views: 28

Re: Limiting Reactant Question

There would be no limiting reactant then because you'd have exactly what you need.
by Diana_Diep2I
Wed Oct 02, 2019 5:49 pm
Forum: Properties of Light
Topic: Electromagnetic Radiation and Light
Replies: 2
Views: 42

Re: Electromagnetic Radiation and Light

Light IS electromagnetic radiation. It's on the EM radiation spectrum and is a small section that is visible to us (colors). And electromagnetic radiation is produced when the atom absorbs some form of energy like heat.
by Diana_Diep2I
Tue Oct 01, 2019 4:54 pm
Forum: Limiting Reactant Calculations
Topic: Aqueous Solutions
Replies: 3
Views: 28

Re: Aqueous Solutions

No, we cannot assume that water will always be the excess reactant. You always have to calculate for the limiting reactant because sometimes the solid does not have to dissolve completely in water. Imagine putting a little too much salt in water...you'd still have some solution and some solid at the...
by Diana_Diep2I
Tue Oct 01, 2019 4:45 pm
Forum: Significant Figures
Topic: Sig Figs for Tests/Quizzes
Replies: 7
Views: 77

Re: Sig Figs for Tests/Quizzes

I agree. Try to keep all of your calculations as accurate as possible until the last rounding for your answer. But I asked the sig fig question during my discussion and I was told that there would not really be a penalty when it comes to sig figs.
by Diana_Diep2I
Sun Sep 29, 2019 12:32 am
Forum: Significant Figures
Topic: Sig Figs in Scientific Notation
Replies: 5
Views: 89

Re: Sig Figs in Scientific Notation

Hi! To answer your question, the number of sig figs in your scientifically notated number would depend on the given numbers in your equations. If the least number of sig figs in the problem is 3 digits, then yes you would write 1.12x10^-3. If the least number of sig figs in the problem is 5, then it...

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