Search found 92 matches

by Trent Yamamoto 2J
Sun Feb 16, 2020 10:59 pm
Forum: Balancing Redox Reactions
Topic: Oxygen
Replies: 9
Views: 34

Re: Oxygen

Mitchell Koss 4G wrote:The same elements usually have the same oxidation numbers. The periodic table also has trends.


Can someone explain the periodic trends please?
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:58 pm
Forum: Balancing Redox Reactions
Topic: Seperating Redoz RXNS
Replies: 7
Views: 15

Re: Seperating Redoz RXNS

By separating the redox reactions, this means that the oxidation half is separated from the reduction half
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:53 pm
Forum: Balancing Redox Reactions
Topic: Electrochemisty
Replies: 10
Views: 34

Re: Electrochemisty

In a chemical reaction, there is an electric current that is produced and vice versa (such as when recharging a battery).
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:50 pm
Forum: Balancing Redox Reactions
Topic: oxidation vs reduction
Replies: 18
Views: 45

Re: oxidation vs reduction

By definition, oxidation is when there is a loss of electrons (oxidation increases) and reduction is when there is a gain of electrons (oxidation decreases)
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:46 pm
Forum: Van't Hoff Equation
Topic: Enthalpy, Entropy, and Gibbs Free Energy
Replies: 7
Views: 33

Re: Enthalpy, Entropy, and Gibbs Free Energy

Delta G will not be constant because it is dependent on temperature and the temperatures will be different.
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:44 pm
Forum: Van't Hoff Equation
Topic: T1 and T2
Replies: 7
Views: 23

Re: T1 and T2

Since K is influenced by temperature, this is why there are separate K values for differing T values
by Trent Yamamoto 2J
Sun Feb 16, 2020 10:42 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff's Equation
Replies: 3
Views: 10

Re: Van't Hoff's Equation

The Van't Hoff Equation is used to find the temperature dependence of K and can be used to calculate K at a different temperature if delta H is known. Additionally, the difference between two Van't Hoff Equations can be evaluated to find lnK2-lnK1 (given that delta s and delta h are both constant).
by Trent Yamamoto 2J
Mon Feb 10, 2020 2:34 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Heat capacity
Replies: 6
Views: 17

Re: Heat capacity

Based on today's lecture, Professor Lavelle said that it will be given either on the equation sheet or in the question
by Trent Yamamoto 2J
Mon Feb 10, 2020 12:29 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: q rev
Replies: 9
Views: 33

Re: q rev

Q is the heat released/absorbed and rev refers to the fact that the reaction is reversible
by Trent Yamamoto 2J
Mon Feb 10, 2020 12:22 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Spontaneous vs Favorable
Replies: 8
Views: 32

Re: Spontaneous vs Favorable

They both mean the same thing, that is the reaction will occur on its own without additional energy
by Trent Yamamoto 2J
Mon Feb 10, 2020 12:18 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp v.Cv
Replies: 6
Views: 29

Re: Cp v.Cv

Cp is used when there is constant pressure while Cv is used when there is constant volume
by Trent Yamamoto 2J
Sat Feb 08, 2020 7:41 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Constant T,P,V
Replies: 4
Views: 21

Constant T,P,V

In what instances will we know when temperature, pressure, or volume are held constant when calculating the change in entropy?
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:52 pm
Forum: Phase Changes & Related Calculations
Topic: ∆H
Replies: 17
Views: 54

Re: ∆H

Delta H is the easiest to determine if a reaction is positive or negative
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:50 pm
Forum: Phase Changes & Related Calculations
Topic: Relevance of Phase Changes
Replies: 9
Views: 32

Re: Relevance of Phase Changes

A phase change would mean that you would have to add the energy required for that phase change in order to calculate the overall enthalpy
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:46 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause burns?
Replies: 29
Views: 108

Re: Why does steam cause burns?

Unlike boiling water, steam experiences a phase change when it comes into contact with skin and thus releases a larger amount of heat that causes severe burns.
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:45 pm
Forum: Phase Changes & Related Calculations
Topic: Pressure in an Open Beaker
Replies: 10
Views: 21

Re: Pressure in an Open Beaker

For an open beaker, you are assuming that the only pressure against it would be constant air pressure (1atm)
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess’ Law
Replies: 10
Views: 35

Re: Hess’ Law

Hess's Law establishes that the total enthalpy change for the reaction is the sum of all changes.
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:43 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating q
Replies: 5
Views: 30

Re: Calculating q

Check to see what you are given. Based on whether you are solving for specific heat capacity or q, then you would know whether or not to use the mass
by Trent Yamamoto 2J
Sun Feb 02, 2020 10:41 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Value of q
Replies: 11
Views: 56

Re: Value of q

n a perfect system, q lost/gained by system = q gained/lost by surroundings. <--- may be negative
by Trent Yamamoto 2J
Tue Jan 28, 2020 2:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 11
Views: 38

Re: Hess's Law

Hess's Law states that the enthalpy change at each step can be added to give the total enthalpy change, so you would use this when given the Delta H rxn is given for the different steps.
by Trent Yamamoto 2J
Tue Jan 28, 2020 2:05 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Best Method of the 3 Given?
Replies: 7
Views: 25

Best Method of the 3 Given?

Given that there are 3 different methods to calculate the Delta H of a Reaction, which would be the most commonly used?
by Trent Yamamoto 2J
Tue Jan 28, 2020 2:01 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Test 2
Replies: 7
Views: 46

Re: Test 2

Should just be from all material after the midterm, similar to 14a
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:59 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Bomb calorimetry
Replies: 3
Views: 11

Re: Bomb calorimetry

Bomb calorimeters would be used when you want to keep the volume constant. This would result in a pressure build up.
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:54 pm
Forum: Phase Changes & Related Calculations
Topic: Change in Temperature
Replies: 10
Views: 20

Re: Change in Temperature

Temperature is the only condition that will alter the K value. In an exothermic reaction, where heat is released, your constant will decrease. If the reaction is endothermic, where heat is absorbed, your constant will increase.
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE
Replies: 20
Views: 70

Re: ICE

You would set up an ICE table when given some significant value (ie. pH, pOH, K, etc.) and want to find the concentrations of the reactants and products in a chemical reaction. Usually questions tend to ask for the equilibrium concentrations after giving a K value and one initial concentration.
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:48 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Kc Vs Kp
Replies: 18
Views: 86

Re: Using Kc Vs Kp

You would use Kc when given molar concentrations of solutions in any state and Kp when you're given partial pressures only in the gas state
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's principle
Replies: 7
Views: 26

Re: Le Chatelier's principle

Le Chatelier's Principle helps determine how a chemical equilibrium will adjust in order to minimize the effects of a certain change in a condition. For example, if the temperature increases in an endothermic reaction, there will be a shift towards the products in order to compensate.
by Trent Yamamoto 2J
Tue Jan 28, 2020 1:43 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic reaction
Replies: 18
Views: 44

Re: Exothermic reaction

In an exothermic reaction, since heat is being released as a result of the reactants, increasing the temperature would shift towards those reactants. Vice versa for the products: decreasing temperature would shift towards the products.
by Trent Yamamoto 2J
Mon Jan 20, 2020 3:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6.B.9
Replies: 1
Views: 13

6.B.9

Can pH be negative and can pH/pOH be a number greater than 14?
by Trent Yamamoto 2J
Sun Jan 19, 2020 9:33 pm
Forum: Ideal Gases
Topic: When to use this equation
Replies: 14
Views: 69

Re: When to use this equation

PV=nRT is used to convert from a pressure of a gas back into a concentration
by Trent Yamamoto 2J
Sun Jan 19, 2020 9:31 pm
Forum: Ideal Gases
Topic: R Constant
Replies: 7
Views: 20

Re: R Constant

The R values are different depending on the temperature used in the reaction
by Trent Yamamoto 2J
Sun Jan 19, 2020 9:29 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5% rule
Replies: 10
Views: 41

Re: 5% rule

The 5% Rule essentially means you can approximate the value for x on an ice table because the value is so small it doesn't make a significant change in the concentration. For example, Professor Lavelle talked about how a millionaire giving away $1,000 would barely notice the difference.
by Trent Yamamoto 2J
Sun Jan 19, 2020 9:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Q
Replies: 14
Views: 31

Re: K vs Q

Usually the question will ask you to find the reaction quotient Q, which you will then compare to the given K to see if the reaction is already at equilibrium or if the reactants/products are favored.
by Trent Yamamoto 2J
Sun Jan 19, 2020 9:22 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 175

Re: Topics on Test 1

In my discussion my TA said we should know everything regarding chemical equilibrium and acids/bases
by Trent Yamamoto 2J
Sun Jan 19, 2020 4:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.I.11/13
Replies: 2
Views: 20

5.I.11/13

Just confirming, when calculating for K or Q, the concentrations will have to be converted into moles/liter if the concentrations given are in mmol correct?
by Trent Yamamoto 2J
Sat Dec 07, 2019 10:21 pm
Forum: Air Pollution & Acid Rain
Topic: Acid rain
Replies: 2
Views: 67

Re: Acid rain

This is the chemical equation that you should know

H2O + CO2 --> H2CO3
by Trent Yamamoto 2J
Sat Dec 07, 2019 10:16 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Which is the stronger acid?
Replies: 3
Views: 34

Re: Which is the stronger acid?

Having more one more O will increase stability because the negative charge is dispersed more, which increases stability.
by Trent Yamamoto 2J
Sat Dec 07, 2019 10:14 pm
Forum: Conjugate Acids & Bases
Topic: how to figure out?
Replies: 12
Views: 80

Re: how to figure out?

A conjugate base is what is left of an acid when a proton is removed
by Trent Yamamoto 2J
Sat Dec 07, 2019 10:09 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic
Replies: 7
Views: 45

Amphiprotic

What is the significance of an amphiprotic compound?
by Trent Yamamoto 2J
Sat Dec 07, 2019 10:08 pm
Forum: Conjugate Acids & Bases
Topic: what materials to cover for final
Replies: 2
Views: 31

Re: what materials to cover for final

You can go down the outlines on his website as well, understanding those concepts will be important
by Trent Yamamoto 2J
Sun Dec 01, 2019 11:08 pm
Forum: Amphoteric Compounds
Topic: Identifying Them?
Replies: 12
Views: 62

Re: Identifying Them?

An amphoteric compound can either accept or donate protons/hydrogen atoms.
by Trent Yamamoto 2J
Sun Dec 01, 2019 11:07 pm
Forum: Bronsted Acids & Bases
Topic: Final
Replies: 13
Views: 81

Re: Final

I believe that he will also be doing practice problems this week that should help prepare us for the final
by Trent Yamamoto 2J
Sun Dec 01, 2019 11:03 pm
Forum: Biological Examples
Topic: Vitamin B12
Replies: 3
Views: 39

Vitamin B12

What should we know about Vitamin B12 for the final?
by Trent Yamamoto 2J
Sun Dec 01, 2019 11:02 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 12
Views: 93

Re: Cisplatin

Cisplatin is a chemotherapy drug that stops cell division by forming a coordination compound with DNA by bonding with the N7 Guanine lone pair. It is important to note that Transplatin does not have the same effect because the Cl's are on opposite sides.
by Trent Yamamoto 2J
Sun Dec 01, 2019 10:59 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition metals
Replies: 4
Views: 30

Re: Transition metals

Transition metals are located in the d-block (groups 3-12)
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Molecular shape vs Electron Configuration
Replies: 4
Views: 22

Re: Molecular shape vs Electron Configuration

Electron configuration is the arrangement of the electrons in a molecule. However, the molecular shape doesn't necessarily follow the electron configuration (though it is influenced by it). For example, a molecule could have a tetrahedral electron configuration but if it has a lone pair, that means ...
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:39 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Use of Bronsted or Lewis Definitions
Replies: 7
Views: 39

Use of Bronsted or Lewis Definitions

In regards to our class, should we use the Bronsted definition or Lewis definition?
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:35 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition Metals
Replies: 1
Views: 31

Transition Metals

Why do transition metal cations specifically form complexes?
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:33 pm
Forum: Biological Examples
Topic: Ring structure
Replies: 2
Views: 22

Re: Ring structure

A ring structure forms when a chelate forms a ring of atoms around the central metal atom. Another example would be [CoN4(CH2)4].
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What is a coordinate number?
Replies: 3
Views: 16

Re: What is a coordinate number?

A coordinate number represents the number of bonds with ligands attached to the central atom. For example, [Fe(CN)6]^4- has a coordination # of 6.
by Trent Yamamoto 2J
Sun Nov 24, 2019 5:23 pm
Forum: Biological Examples
Topic: cisplatin
Replies: 6
Views: 49

Re: cisplatin

Cisplatin forms a coordination compound with DNA, which stops the rapid and controllable cell division of cancer cells. However, it does not single out cancer cells specifically, and can stop the division of normal cells as well
by Trent Yamamoto 2J
Mon Nov 18, 2019 11:11 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: 3.F.1 c and d
Replies: 1
Views: 20

3.F.1 c and d

Can someone explain why there are dipole-dipole forces present in 3.F.1 c and d?
by Trent Yamamoto 2J
Sun Nov 17, 2019 6:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Grading
Replies: 7
Views: 71

Re: Grading

From what I've read the curve occurs after the final, but usually it doesn't deviate too much from the standard 70% C, 80% B, and 90% A scale.
by Trent Yamamoto 2J
Sun Nov 17, 2019 6:35 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 82

Re: Test 2 Topics

Dr. Lavelle also explicitly said Hybridization would not be on Test 2
by Trent Yamamoto 2J
Sun Nov 17, 2019 6:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: repulsion strength
Replies: 5
Views: 22

Re: repulsion strength

lone pair - lone pair has the strongest repulsion, lone pair - atom has the second strongest repulsion, and atom -atom has the least strongest repulsion.
by Trent Yamamoto 2J
Sun Nov 17, 2019 6:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Prediction of Angles
Replies: 4
Views: 25

Re: Prediction of Angles

The bond angles usually follow the same sort of pattern based on regions of electron concentration. It is important to keep in mind the lone pairs though, because these will decrease the expected bond angle.
by Trent Yamamoto 2J
Sun Nov 17, 2019 6:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dispersion
Replies: 5
Views: 40

Re: Dispersion

I do also know that Dr. Lavelle said that he would focus on covering sigma and pie bonds on Monday, so if he doesn't mention those then I would go over them anyways
by Trent Yamamoto 2J
Mon Nov 11, 2019 10:46 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 24

Re: Dipole Moments

Andrea_3F wrote:So can dipole moments be temporary or all they all permanent?


I believe dipole moments are permanent
by Trent Yamamoto 2J
Mon Nov 11, 2019 10:43 am
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 6
Views: 33

Re: Dipole Moment

I believe you can also recognize a dipole moment when there is a polar covalent bond, which by definition is when electrons in a covalent bond are not equally shared.
by Trent Yamamoto 2J
Mon Nov 11, 2019 10:39 am
Forum: Bond Lengths & Energies
Topic: London Forces
Replies: 6
Views: 45

Re: London Forces

Yes, there are electrons in every atom and these cause these forces
by Trent Yamamoto 2J
Mon Nov 11, 2019 10:37 am
Forum: Bond Lengths & Energies
Topic: Van Der Waals BP
Replies: 6
Views: 41

Van Der Waals BP

Which intermolecular force increases boiling point the most?
by Trent Yamamoto 2J
Mon Nov 11, 2019 10:32 am
Forum: Dipole Moments
Topic: Dissociation Energies
Replies: 3
Views: 17

Dissociation Energies

Why is dissociation energy, which is required to break a bond, always positive?
by Trent Yamamoto 2J
Sun Nov 03, 2019 11:43 pm
Forum: Electronegativity
Topic: Electronegativity Ex.
Replies: 2
Views: 24

Electronegativity Ex.

How would you determine which bond has greater ionic character between HCl and HI?
by Trent Yamamoto 2J
Sun Nov 03, 2019 11:40 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond
Replies: 2
Views: 46

Coordinate Covalent Bond

Does a coordinate covalent bond only occur with Lewis acids and Bases? (I know Boron Trifluoride was given as an example)
by Trent Yamamoto 2J
Sun Nov 03, 2019 11:30 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 4
Views: 48

Expanded Octet

Lewis structures with expanded octets have lower energy than with the regular octet structure (comparing the formal charge), so is it more stable and therefore more favorable to draw structures with expanded octets?
by Trent Yamamoto 2J
Sun Nov 03, 2019 11:24 pm
Forum: Octet Exceptions
Topic: Period 3
Replies: 2
Views: 29

Period 3

Why can atoms in the third period or higher accommodate more than 8 valence electrons?
by Trent Yamamoto 2J
Sun Nov 03, 2019 11:02 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted e- as highly polarizable
Replies: 5
Views: 53

Distorted e- as highly polarizable

Why are highly distorted electrons described as being highly polarizable? Which characteristics result in the ionic bond being more covalent in character?
by Trent Yamamoto 2J
Sun Nov 03, 2019 10:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Kinetic Energy Uncertainty Conversion
Replies: 3
Views: 55

Re: Kinetic Energy Uncertainty Conversion

Kevin Antony 1J wrote:From what I gather, you know have energy per electron. We know there are 6.022 x 10^23 electrons in a mol. If you divide by Avagadro's number you should get energy per mol.


That makes sense, thank you!
by Trent Yamamoto 2J
Sun Nov 03, 2019 10:55 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 2
Views: 43

Drawing Resonance Structures

During my discussion, it was mentioned that when drawing resonance structures that if, let's say there's two double bonds, you can hold that one double bond constant and rotate the other around to other pairs. Would this account for all of the possible answers that would be required for a question a...
by Trent Yamamoto 2J
Sun Nov 03, 2019 8:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Kinetic Energy Uncertainty Conversion
Replies: 3
Views: 55

Kinetic Energy Uncertainty Conversion

In the Heisenberg Indeterminacy Module, question 22 asked for the uncertainty in kinetic energy (which I was able to calculate) and the conversion of that into moles. How would I do that?
by Trent Yamamoto 2J
Sun Nov 03, 2019 8:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Manipulating for the initial energy level
Replies: 2
Views: 36

Manipulating for the initial energy level

When we're solving for the initial energy level in a transition using E=hv and E= -hR/(n^2 final) + hR/(n^2 initial), should the manipulation to find the initial energy level be done at the beginning of the problem to isolate n initial or should you just plug in the values and solve for it algebraic...
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
Replies: 5
Views: 32

Re: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]

The x is in reference to the plane, among the x, y, and z planes
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:54 pm
Forum: Quantum Numbers and The H-Atom
Topic: Stern and Gerlach
Replies: 5
Views: 39

Re: Stern and Gerlach

My key takeaway from the experiment was that electrons have different spins (spin up vs. spin down), which create different electric fields.
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:42 pm
Forum: *Shrodinger Equation
Topic: Hamiltonian
Replies: 5
Views: 51

Re: Hamiltonian

A Hamiltonian is a second derivative (ie. d/dx[sinx]= cosx d/dx[cosx]= -sinx)
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 390

Re: Best Way To Study?

Hi! I've found it very helpful to take lecture notes on a notepad, then the following day condensing the notes into a separate notebook. I've found it really useful in helping the information stick and it makes referring to my notes so much easier. It'll also help having a notebook full of notes for...
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Incorrect Atom Model
Replies: 3
Views: 31

Incorrect Atom Model

What specifically makes the answer from the incorrect atom model's (electron located inside of the nucleus) application of the Heisenberg Equation 'unrealistic?'
by Trent Yamamoto 2J
Wed Oct 16, 2019 10:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Untrue PSI From Lecture
Replies: 2
Views: 36

Untrue PSI From Lecture

At the end of today's lecture, Lavelle wrote some PSI values on the board and said that they were untrue. One of them was PSI (1, 1, 0, +1/2); can someone explain why this wouldn't be able to exist?
by Trent Yamamoto 2J
Sun Oct 13, 2019 9:14 pm
Forum: DeBroglie Equation
Topic: Concept of a wave
Replies: 7
Views: 82

Re: Concept of a wave

DeBroglie is used when detecting extremely small masses (unlike the car example in lecture).
by Trent Yamamoto 2J
Sun Oct 13, 2019 12:07 am
Forum: Properties of Light
Topic: e=hv
Replies: 7
Views: 73

Re: e=hv

e=hv is in regards to energy per photon, which directly relates to light.
by Trent Yamamoto 2J
Sun Oct 13, 2019 12:06 am
Forum: DeBroglie Equation
Topic: De Broglie's Equation
Replies: 13
Views: 78

Re: De Broglie's Equation

De Broglie is applied when we are solving for an object's wavelength, and the the resting mass is given. For example, it could be the baseball being hit or a car moving.
by Trent Yamamoto 2J
Sun Oct 13, 2019 12:01 am
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 956

Re: Speed of Light

The speed of light is a constant (3*10^8) and is always reflected as so on the constant sheet.
by Trent Yamamoto 2J
Sat Oct 12, 2019 11:59 pm
Forum: Photoelectric Effect
Topic: Wave-like Properties
Replies: 4
Views: 46

Re: Wave-like Properties

After seeing the use of the mass of the car example in lecture, you can see that the larger the mass the smaller the wavelength properties. This would make it not detectable.
by Trent Yamamoto 2J
Sat Oct 12, 2019 11:56 pm
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 106

Re: Frequency vs. Wavelength

The easiest way that I characterize frequency and wavelength is that they are inversely proportional to one another.
by Trent Yamamoto 2J
Sat Oct 12, 2019 11:53 pm
Forum: Photoelectric Effect
Topic: Mass of Electron
Replies: 6
Views: 46

Re: Mass of Electron

The mass of an electron is 9.10938 × 10-31 kg
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification
Replies: 7
Views: 104

Re: Clarification

Do the moles of a solute change when being diluted at all, in any instance? If not, why? The moles of a solute never change when being diluted. Imagine you're making a cup of hot cocoa by pouring in a packet of cocoa mixture into a mug of water. Even if you added more water to the mug, the amount of...
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question on F.1 Part B
Replies: 3
Views: 46

Re: Question on F.1 Part B

The number of atoms are given in the molecular formula, and since you are trying to get to the grams of that element divided by the molar mass in order to find the the mass percentage composition, you wouldn't have to use Avogadro's number.
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:39 pm
Forum: Empirical & Molecular Formulas
Topic: 100 gram Method?
Replies: 9
Views: 94

Re: 100 gram Method?

The "100 gram" trick makes it really easy when using the mass composition to get to the empirical formula. If the mass composition were given to you in a problem (say, 25% C 50% H and 25% O), it would be very convenient to imagine these percentages out of 100 grams. There would be 25g C, 5...
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:30 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 89

Re: Calculating Theoretical Yield

Usually the amount of the limiting reactant is given in the problem, but it can either be in moles or grams. After you figure out what the limiting reactant is, you can multiply that based on the mole ratio and molar mass of the product you're trying to find the theoretical yield for to get the actu...
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:26 pm
Forum: Balancing Chemical Reactions
Topic: Homework
Replies: 4
Views: 61

Re: Homework

I'm pretty sure right corner would be preferred. I put my name, UID, lecture, and discussion in the top right corner
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:22 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 8
Views: 132

Re: Avogadro's Number

Since Avogadro's number represents the number of atoms in 1 mole. On E7, you would divide 2.1 x 10^9 by Avogadro's number (6.022 x 10^23) to get the number of moles of Carbon.
by Trent Yamamoto 2J
Thu Oct 03, 2019 9:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: HW E. 1
Replies: 3
Views: 57

HW E. 1

For this question (Fundamentals E.1), I don't understand why 288pm was used instead of the given 144pm. How did they get to this unit of measure?

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