Search found 90 matches

by Jonathan Pai 2I
Mon Feb 18, 2019 8:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 4
Views: 15

Re: Gibbs Free Energy

yeah it's the equilibrium constant
by Jonathan Pai 2I
Mon Feb 18, 2019 8:43 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity and exothermic reactions
Replies: 3
Views: 9

Re: Spontaneity and exothermic reactions

All chemical things want to go to a lower energy, so exothermics release energy, that is why it is spontaneous.
by Jonathan Pai 2I
Mon Feb 18, 2019 8:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: reversible and irreversible processes
Replies: 5
Views: 26

Re: reversible and irreversible processes

reversible happens slowly so heat change can occur and the pressure usually is changing
by Jonathan Pai 2I
Mon Feb 18, 2019 8:35 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G a state function?
Replies: 13
Views: 39

Re: Delta G a state function?

yes, it involves enthalpy and temperature
by Jonathan Pai 2I
Mon Feb 18, 2019 8:33 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal energy (U) of an isolated system
Replies: 11
Views: 46

Re: Internal energy (U) of an isolated system

isolated system transfers no matter or energy, so deltaU is 0, however U can have a specific value.
by Jonathan Pai 2I
Mon Feb 18, 2019 8:32 pm
Forum: Calculating Work of Expansion
Topic: Units for R
Replies: 9
Views: 21

Re: Units for R

using which R depends on if the answer is looking for joules or looking for something else, like liters per mol. But, you can always convert after using 101.325 to get the correct units and value
by Jonathan Pai 2I
Mon Feb 18, 2019 8:30 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: standard Gibbs Free Energy
Replies: 4
Views: 7

Re: standard Gibbs Free Energy

the numerical values will have the little dot showing it is standard
by Jonathan Pai 2I
Mon Feb 11, 2019 10:19 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: General entropy question
Replies: 9
Views: 43

Re: General entropy question

complexity of the molecule effects entropy
by Jonathan Pai 2I
Mon Feb 11, 2019 10:18 am
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 10
Views: 42

Re: Reversible vs Irreversible

irreversable needs to occur slowly for heat to equal out and pressure
by Jonathan Pai 2I
Sat Feb 09, 2019 10:29 am
Forum: Calculating Work of Expansion
Topic: Reversible and constant pressure
Replies: 2
Views: 17

Reversible and constant pressure

I thought the main point of reversible was a changing pressure, but a homework problem asks us to solve a reversible at constant pressure. Can you explain the relationship between reversible and pressure.
by Jonathan Pai 2I
Wed Feb 06, 2019 4:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Calorimeter and Heat
Replies: 1
Views: 25

Calorimeter and Heat

Why does q=(C)(deltaT) for the q of a calorimeter. Why can we omit moles, n, from the equation when dealing with heat transfer with the calorimeter.
by Jonathan Pai 2I
Sun Feb 03, 2019 10:48 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant numbers
Replies: 4
Views: 35

Re: Constant numbers

We are provided the constants and equations. Ones specific for this chapter are the ideal gas constants, ideal gas law, heat, the two work equations, etc.
by Jonathan Pai 2I
Sat Feb 02, 2019 7:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy & Constant Pressure and Volume
Replies: 2
Views: 30

Enthalpy & Constant Pressure and Volume

Why does deltaH=q at constant pressure?

Why does deltaH=q at constant volume?

Thanks CC
by Jonathan Pai 2I
Wed Jan 30, 2019 8:24 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Engine and Body Open system
Replies: 3
Views: 23

Engine and Body Open system

Why is a motor engine and a body considered open systems?
by Jonathan Pai 2I
Sun Jan 27, 2019 3:43 pm
Forum: Phase Changes & Related Calculations
Topic: Why are phase changes endothermic?
Replies: 11
Views: 49

Re: Why are phase changes endothermic?

Think of how we looked at endothermic reactions in equilibrium and boiling water. If you boil water (add heat), what happens. Water vapor is formed (product), so the added heat from the stove created more products, which is the characteristic of an endothermic reaction. H2O(l) + heat <> H2O(g) , shi...
by Jonathan Pai 2I
Sun Jan 27, 2019 3:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa values
Replies: 3
Views: 21

Re: pKa values

A table will be given in the book. Sometimes though it will give us the K value for the conjugate base/acid, so we would need to manipulate Kw=Ka*Kb.
by Jonathan Pai 2I
Sun Jan 27, 2019 3:37 pm
Forum: Ideal Gases
Topic: Approximations for ICE
Replies: 13
Views: 44

Re: Approximations for ICE

When the k value is small, 10^-3 , because so little of the reactants go to products it is negligable.
by Jonathan Pai 2I
Mon Jan 21, 2019 2:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Aluminum Conjugate
Replies: 1
Views: 32

Aluminum Conjugate

In 6D15, why does the AlCl3 become Al(H2O)^6 in the chemical equation, why doesn't it just become Al^3+, and why would it get 6 water molecules? And where was the Ka value provided? Thanks.
by Jonathan Pai 2I
Mon Jan 21, 2019 2:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Conjugates
Replies: 2
Views: 28

Re: Conjugates

If it contains one more or less H, and the other atoms are the same. in the 6C1 table, they are there, the conjugate would be slightly different and would have the other Ka or Kb, depending if it is a conjugate acid or base.
by Jonathan Pai 2I
Sun Jan 20, 2019 8:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gases
Replies: 7
Views: 37

Re: Inert Gases

There is no equilibrium change because the concentration of the gases at interest have not changed. Neither the n nor V have changed.
by Jonathan Pai 2I
Sun Jan 20, 2019 8:45 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure
Replies: 8
Views: 54

Re: Pressure

The K value is same though.
by Jonathan Pai 2I
Sun Jan 20, 2019 8:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: The Conjugate Seesaw
Replies: 13
Views: 74

Re: The Conjugate Seesaw

Ka*Kb = Kw

Kw is always 1.0x10^-14, so is one value increases, the other decreases.
by Jonathan Pai 2I
Sun Jan 20, 2019 8:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 10
Views: 55

Re: Q and K

K uses only equilibrium concentrations. Q can use any concentration at any time, which tells us where the reaction will go.
by Jonathan Pai 2I
Sun Jan 13, 2019 2:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 5
Views: 22

Re: Kc and Kp

Use the one your given, don't use the one your not given.
by Jonathan Pai 2I
Sun Jan 13, 2019 2:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic Reactions
Replies: 9
Views: 68

Re: Exothermic Reactions

Stability also relates to exo or endo, such as the HW question using a halogen, which makes us have to know that halogens are stable diatomically, so dissociating to monotomic would have to be endothermic.
by Jonathan Pai 2I
Sun Jan 13, 2019 2:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in Partial Pressure
Replies: 5
Views: 49

Re: Changes in Partial Pressure

Everything is assumed to remain the same unless it is explicitly stated.
by Jonathan Pai 2I
Sat Dec 08, 2018 2:55 pm
Forum: Naming
Topic: confusion name to formula
Replies: 4
Views: 41

Re: confusion name to formula

It has -ate either because the hexcyanidochromate(III) part, the complex, is negative or because the chromium had just eaten.
by Jonathan Pai 2I
Fri Dec 07, 2018 1:31 pm
Forum: Lewis Acids & Bases
Topic: Determining Factors
Replies: 2
Views: 21

Re: Determining Factors

Lone pairs or unfilled octet. Or if it's got extra H's or OH's.
by Jonathan Pai 2I
Fri Dec 07, 2018 1:29 pm
Forum: Conjugate Acids & Bases
Topic: Water as an Acid/Base
Replies: 8
Views: 34

Re: Water as an Acid/Base

Depends if it loses or accepts and H.
by Jonathan Pai 2I
Fri Dec 07, 2018 1:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizing Power for Na+, Mg2+, Li+, Be2+
Replies: 4
Views: 28

Re: Polarizing Power for Na+, Mg2+, Li+, Be2+

Lit is smaller so it has stronger polarizing power. You might be confusing poloarizing power with polarizability.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Bond Angles
Replies: 6
Views: 4319

Re: Seesaw Bond Angles

Nah
by Jonathan Pai 2I
Mon Nov 26, 2018 7:52 pm
Forum: Hybridization
Topic: Atomic Orbitals
Replies: 2
Views: 18

Re: Atomic Orbitals

It means hybridization comes from atomic orbitals.

The orbitals hybridize so they can have more orbitals and a different shape that is necessary to form a bond.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:50 pm
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 1
Views: 33

Re: Bond Lengths

For example, if molecule X has 2 double bonds and 1 single and molecule Y has 1 double bond and 2 single bonds, Molecule Y is longer because the averages are longer.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:47 pm
Forum: Hybridization
Topic: bond angles
Replies: 2
Views: 19

Re: bond angles

For sure
by Jonathan Pai 2I
Mon Nov 26, 2018 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Location of Lone Pairs
Replies: 2
Views: 24

Re: Location of Lone Pairs

Octahedral is 90* between any atom, that's why it doesn't matter. But Trig Bipyr has angles of 90*(axial to equatorials) and 120*(trig planar atoms), that's why LP placement matters in Trig Bipyr.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Dipole Moment
Replies: 3
Views: 29

Re: Dipole Moment

A good reminder is the tail of the arrow having a perpendicular line to represent the addition symbol, +, thus showing that is the positive side going towards the negative part.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:36 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: Boiling Point
Replies: 3
Views: 58

Re: Boiling Point

Yes it depends on IMF's.

From those it looks like LiCl is ionic, C3H7OH is H Bonding, C4H8 is nonpolar Londons, and N2 is also nonpolar but I think weaker than C4H8 because it has less electrons, so less London strength.

Correct me if I'm wrong.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:33 pm
Forum: Sigma & Pi Bonds
Topic: Resonance structure
Replies: 2
Views: 30

Re: Resonance structure

I believe Sigma and Pie bonds aren't meant to describe the actual thing, such as resonance being an average of the bond lengths, but instead describing how we describe bonded molecules as single, double, triple bonds.
by Jonathan Pai 2I
Mon Nov 26, 2018 7:28 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: Intermolecular forces and melting/boiling points
Replies: 4
Views: 35

Re: Intermolecular forces and melting/boiling points

Dipole Dipole is molecules having a concentration of charge in a certain area due to polarity, which allows for greater attraction with another molecule that has its charges concentrated in certain areas. Hydrogen bonding is just super strong Dipole Dipole because of the Hydrogen with very electrone...
by Jonathan Pai 2I
Sun Nov 25, 2018 6:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs pi bonds
Replies: 7
Views: 34

Re: Sigma vs pi bonds

Sigma's bond along the same orientation axis. Pie bonds don't, so there is no rotation. Pie bonds are weaker than Sigma bonds because they don't have overlap, so weaker attraction
by Jonathan Pai 2I
Sun Nov 25, 2018 6:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Arrangement vs. Molecular Shape
Replies: 2
Views: 31

Electron Arrangement vs. Molecular Shape

What is the difference? What terms are used to describe each one?
by Jonathan Pai 2I
Sun Nov 25, 2018 6:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 2
Views: 39

Re: Seesaw

If it was in axial position, it would be repelling with 3 atoms at 90 degrees, because all 3 equatorial atoms would be there. Because it is in the equatorial position, it is only 90 degrees with 2 atoms, the axial ones.
by Jonathan Pai 2I
Sat Nov 24, 2018 7:40 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: Intermolecular energy
Replies: 3
Views: 39

Re: Intermolecular energy

I think it's Potential Energy of the London interaction between different molecules. The potential energy decreases very rapidly with distance increase because it is r^6.
by Jonathan Pai 2I
Sat Nov 24, 2018 7:18 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 5
Views: 56

Re: Sigma and Pi bonds

Qualitative differences prob. Maybe why a double bond isn't twice as strong as a single bond, because Pie bond is weaker than Sigma bond.
by Jonathan Pai 2I
Sat Nov 24, 2018 7:15 pm
Forum: Hybridization
Topic: double bonds
Replies: 14
Views: 105

Re: double bonds

Because Pie bonds don't overlap like Sigma bonds, they are weaker than Sigma bonds. That's why double bonds are less than twice as strong as single bond.
by Jonathan Pai 2I
Sat Nov 24, 2018 7:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structure N2O
Replies: 4
Views: 40

Re: Lewis Structure N2O

Formal charge wouldn't work out either
by Jonathan Pai 2I
Sat Nov 24, 2018 7:05 pm
Forum: Electronegativity
Topic: Arrows showing charge
Replies: 4
Views: 59

Re: Arrows showing charge

Some arrows have a plus sign, +, on the tail showing positive and then point of arrow is going to negative
by Jonathan Pai 2I
Sat Nov 24, 2018 6:35 pm
Forum: Ionic & Covalent Bonds
Topic: Determining the Difference between Ionic and Covalent Bonds
Replies: 6
Views: 72

Re: Determining the Difference between Ionic and Covalent Bonds

It's good to know about the 2 and 1.5 values, but understanding why is a better plan. Given ionic bonds have large electronegativity differences, of course they'll be greater than 2, so knowing bonds that are of an atom on the left and right of periodic table, thus large electronegativity difference...
by Jonathan Pai 2I
Sun Nov 18, 2018 9:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 3
Views: 49

Re: Trigonal Bipyramidal

Trigonal Bipyramidal is like a totally blended version of linear, axial, and trigonal planar, equatorial.
by Jonathan Pai 2I
Sun Nov 18, 2018 9:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar/Nonpolar
Replies: 3
Views: 41

Polar/Nonpolar

Why is CH2Cl2 polar, I was thinking them H's would cancel each other and them Cl's would cancel each other. This problem 2E25D.

Thanks CC squad!
by Jonathan Pai 2I
Sun Nov 18, 2018 9:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T Shaped
Replies: 3
Views: 43

Re: T Shaped

T-Shape is formed by 5 regions of electron density, which is the trigonal bipyramidal. Trigonal Bipyramidal is 3 equatorial bonds, 120* apart essentially making a trigonal planar, and 2 axial bonds, forming the top point of each pyramid and 90* from each of the equatorial atoms. The reason it forms ...
by Jonathan Pai 2I
Thu Nov 15, 2018 5:47 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 57

Re: Dipole Moments

dipole is a concentration of charge, thus unbalancing the charge in an atom.
by Jonathan Pai 2I
Thu Nov 15, 2018 5:38 pm
Forum: Bond Lengths & Energies
Topic: bond energy clarification
Replies: 4
Views: 42

Re: bond energy clarification

I think energy of breaking the bonds
by Jonathan Pai 2I
Wed Nov 14, 2018 11:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing structures
Replies: 4
Views: 36

Re: Drawing structures

Yes, because it has the same 3 Dimensional shape as a tetrahedral, however because of the lone pair, its shape is "Trigonal Pyramidal"
by Jonathan Pai 2I
Wed Nov 14, 2018 11:16 pm
Forum: Electronegativity
Topic: Homework Question 2D.11
Replies: 1
Views: 25

Re: Homework Question 2D.11

Sarah, you're right that N3- is bigger than O2-, which is why it has more polarizability, because there is more space for charge to concentrate in. You may be confusing the concept of polarizing power, which is question 2D9.
by Jonathan Pai 2I
Wed Nov 14, 2018 11:13 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polar vs nonpolar
Replies: 6
Views: 91

Re: polar vs nonpolar

If charges favor a certain area more than any other area, it is polar. So usually if there is a lone pair hanging out polarity may occur because the lone pair pushes the bonds away more than a typical bond, thus the charges from the bonds are in a tighter local, thus not as equally spread out.
by Jonathan Pai 2I
Wed Nov 14, 2018 11:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 4
Views: 35

Re: Molecular Shape

Google it, Or Bing it ;), what an octahedron looks like. Outside atoms form the points of an octahedron.
by Jonathan Pai 2I
Wed Nov 14, 2018 11:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 21

Re: Bond Angles

The wide balloon effect of Lone Pairs may help you visualize why it pushes the bonds closer, thus decreasing the angles.
by Jonathan Pai 2I
Sat Nov 10, 2018 8:48 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 6
Views: 45

Re: Bond Lengths

Whip out your ruler and check.

We don't need to how to get bond lengths, just understand the relationship between strength, length, and single, double, triple, or james bonds.
by Jonathan Pai 2I
Sat Nov 10, 2018 8:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Lewis Structures with VSPER
Replies: 5
Views: 56

Re: Drawing Lewis Structures with VSPER

Lewis structures do not have to be drawn like its shape because in the complex shapes it would be difficult and pointless to try to replicate the 3D shape in 2D. That's why knowing the name and bond angle is important in order to specify.
by Jonathan Pai 2I
Sun Nov 04, 2018 1:32 pm
Forum: Resonance Structures
Topic: Resonance [ENDORSED]
Replies: 2
Views: 44

Re: Resonance [ENDORSED]

Resonance shows where the least concentration of charge will look like. But in reality, resonance structures are "averaged out". For example a thing with 2 single and 1 double bond is actually like 3 1.33 bonds.
by Jonathan Pai 2I
Mon Oct 22, 2018 10:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Frequency Condition
Replies: 2
Views: 35

Re: Frequency Condition

The second is a simplified version of the deltaE version of the first one. DeltaE being it is set up as final-initial. The first one shows how the energy is related to the concept, the second one does not.
by Jonathan Pai 2I
Mon Oct 22, 2018 10:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition
Replies: 2
Views: 34

Re: Bohr Frequency Condition

No, it the photon just passes right through. This can be understood through conservation of energy. The "input" photon which excites the electron must be the same value of the "output" photon when the electron drops. So it won't happen if it's 2.5, where 2 will input and the .5 w...
by Jonathan Pai 2I
Mon Oct 22, 2018 9:52 am
Forum: Einstein Equation
Topic: Rydberg Equation
Replies: 2
Views: 75

Re: Rydberg Equation

The Rydberg equation is just a derivation from that formula, but the Rydberg doesn't show how it relates to energy and energy levels. You can use the E=hR/(n2) by doing a deltaE equation, doing a E=hR/(n2final) - hR/(n2initial). You can use this equation to find the energy level by isolating an n va...
by Jonathan Pai 2I
Sun Oct 21, 2018 2:27 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Velocity +/- Values
Replies: 3
Views: 67

Velocity +/- Values

A homework problem gave us the velocity which was 5+/-5, so the delta v was 10. What if the velocity is 57+/-4, is delta v 8, 53, or 61? Is it just the +/-(uncertainty) that is the delta v value?
by Jonathan Pai 2I
Sun Oct 21, 2018 2:15 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: real life application of using the uncertainty principle
Replies: 1
Views: 34

Re: real life application of using the uncertainty principle

Trying to find where an electron is at a certain moment, or the speed(technically momentum) of an electron at a certain moment.
by Jonathan Pai 2I
Sun Oct 21, 2018 2:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Equal sign?
Replies: 1
Views: 24

Re: Equal sign?

In that case, the equal sign shows the minimum uncertainty is equal to that value. If you get the greater than or equal to sign, then the minimum uncertainty is that value, but there could also be more uncertainty(any values higher than that value.)
by Jonathan Pai 2I
Sun Oct 21, 2018 2:03 pm
Forum: DeBroglie Equation
Topic: DeBroglie wavelike properties question
Replies: 4
Views: 52

Re: DeBroglie wavelike properties question

A homework de Broglie question gave us the velocity and asked to find wavelength. When I first tried it, I tried finding KE but it did not work out. Then I used de Broglie which was much easier, but my question is is that when we are given a velocity, how can we decipher if it is KE question of de B...
by Jonathan Pai 2I
Sat Oct 20, 2018 4:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: dz^2 Orbital
Replies: 1
Views: 42

Re: dz^2 Orbital

the dz2 orbital has its lobes going through/along the z axis
by Jonathan Pai 2I
Sat Oct 20, 2018 4:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4th quantum number question [ENDORSED]
Replies: 3
Views: 47

Re: 4th quantum number question [ENDORSED]

You do not need to figure out which spin it is, you just need to know there are two spins. So when it is asking about electrons, if you know n, l, and ml- there are two electrons, one with up spin and one with down spin.

Ex) electron 1-(3,2,-2, +.5), electron 2-(3,2,-2,-.5)
by Jonathan Pai 2I
Sat Oct 20, 2018 4:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 6
Views: 44

Re: orbitals

Madeline, the orbitals are based off the axes, so there would be no v or w, only x, y, and z. In the d orbital, there is xy, xz, yz, x^2y^2, z^2. If you see the pictures in the books, the xy, xz, yz ones have the little orbitals in between those stated axes. So for xy, you can see that the 4 globs a...
by Jonathan Pai 2I
Sat Oct 20, 2018 4:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 6
Views: 44

Re: orbitals

Danny, l can be any number lower than n-1. For example, if n=4, l is not automatically 3. l can still be 0, 1, 2, or 3.
by Jonathan Pai 2I
Sat Oct 20, 2018 4:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shielding [ENDORSED]
Replies: 14
Views: 246

Re: Shielding [ENDORSED]

The terms are subshell and orbital, not suborbital. shell(n)>>subshell(l)>>>orbital(ml) Yes you are correct. The n value, for example 2 in 2s and 2p, provides a small "range" of energy levels. In that range of n=2, s orbital is closer than p orbital, so the p orbital does experience less a...
by Jonathan Pai 2I
Sat Oct 20, 2018 1:38 pm
Forum: Quantum Numbers and The H-Atom
Topic: ml Quantum Number
Replies: 4
Views: 50

Re: ml Quantum Number

When it says ml=(-l, l-1,...l), it is giving the range of ml values DEPENDENT upon what the l value is, basically saying the range is -l to +l.

So with d-orb, because d-orb is l=2, the ml values are -2,-1,0,1,2. And these 5 values are the orbitals, not the subshell. The subshell is d.
by Jonathan Pai 2I
Thu Oct 18, 2018 9:57 am
Forum: DeBroglie Equation
Topic: Wave properties
Replies: 3
Views: 40

Re: Wave properties

^^^Michael's post- it can't only be applied to small matter, but it is only useful for small matter.

What the de Broglie equation does is it combines the wave model and the particle model, displaying their relationship to each other.
by Jonathan Pai 2I
Thu Oct 18, 2018 9:55 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Absorption/atomic spectra
Replies: 3
Views: 63

Re: Absorption/atomic spectra

The photon energy is a positive energy into the electron, so in the system it can be thought of as negative and electron positive(conservation of energy), but the photon energy itself is positive,just depends if it's going in or out of the system(direction).
by Jonathan Pai 2I
Fri Oct 12, 2018 8:24 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E 27 Sixth Edition
Replies: 2
Views: 75

Re: E 27 Sixth Edition

Formula units mean atoms for an element or molecules for a compound. Use Avocado's number to get atom units from mols. For tests, the work function in the electric photoelectric effect can be given in joules/mol, which needs to be converted to joules/atom.
by Jonathan Pai 2I
Tue Oct 09, 2018 2:03 pm
Forum: Properties of Light
Topic: 1A question 3 7th edition
Replies: 1
Views: 19

Re: 1A question 3 7th edition

As frequency decreases, the wavelength increases, which means it sort of flattens out. That means the slopes decrease because the extent of change is not as strong if the wavelengths were small.
by Jonathan Pai 2I
Tue Oct 09, 2018 1:59 pm
Forum: Photoelectric Effect
Topic: Work Function, Kinetic Energy
Replies: 2
Views: 68

Work Function, Kinetic Energy

How do you find Kinetic Energy when you are provided only the Work Function and Velocity values? Where would we get the mass, because isn't that necessary for .5mv^2? What other equations are used in this situation.
by Jonathan Pai 2I
Sun Oct 07, 2018 8:51 pm
Forum: Properties of Light
Topic: Atomic Spectra
Replies: 1
Views: 20

Atomic Spectra

What's the deal with Rydberg and the series (Balmer, Lyman, etc.)? What purpose do they serve and what are they trying to show? Also are the n's energy levels? And why do the series have different n assignments, for example Balmer is n1=2 while Lyman is n1=1, what does that mean?

Gracias ;)
by Jonathan Pai 2I
Sun Oct 07, 2018 11:11 am
Forum: Significant Figures
Topic: Chemical Structure
Replies: 2
Views: 46

Re: Chemical Structure

The test topics is only Outline 1.
by Jonathan Pai 2I
Sat Oct 06, 2018 7:57 pm
Forum: Limiting Reactant Calculations
Topic: theoretical yield
Replies: 1
Views: 39

Re: theoretical yield

Percent yield is a ratio between how much mass was actually produced (given in question) to how much mass can ideally, theoretically be produced. So you need hydrazine mass values to compare. 1st you must balance the equation if necessary. Then you need to figure out how to get to N2H4 grams from NH...
by Jonathan Pai 2I
Tue Oct 02, 2018 8:30 pm
Forum: Empirical & Molecular Formulas
Topic: Molar Mass
Replies: 2
Views: 60

Re: Molar Mass

First, decide what you are looking for, which is some molar mass value. Avogadro's number will get you to how many molecules there are, so that will not help the situation. If you are given the percent compositions of metal X and the other elements of the compound, then you can try the 100 g rule. T...
by Jonathan Pai 2I
Tue Oct 02, 2018 8:16 pm
Forum: Molarity, Solutions, Dilutions
Topic: Confused about molarity concept
Replies: 4
Views: 69

Re: Confused about molarity concept

Calculation aside, M(i)V(i)=M(f)V(f) answers your question. Conceptually, knowing that the amount of solute remains the same, if you add more water (Volume is increasing), then even though the amount of solute is the same, it is less concentrated because it is now in a larger area/container/space (C...

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