Search found 86 matches

by 305572629
Tue Feb 23, 2021 12:22 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: ΔS total= 0
Replies: 5
Views: 43

Re: ΔS total= 0

this scenario occurs in a reversible reaction! Since reversible reactions in real life occur slowly, the system has time to regain the heat lost by work, so the overall change in entropy of the universe is = to 0.
by 305572629
Tue Feb 23, 2021 12:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G and G naught
Replies: 37
Views: 91

Re: Delta G and G naught

Delta G by itself is the free energy of a particular system; Delta G naught is the standard conditions of free energy for a system.
by 305572629
Tue Feb 23, 2021 12:19 pm
Forum: Balancing Redox Reactions
Topic: e- in Redox Reactions
Replies: 11
Views: 30

Re: e- in Redox Reactions

Oxidation is loss of electrons in a half-reaction, so they should be on the product side.
by 305572629
Tue Feb 23, 2021 12:17 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: State property
Replies: 19
Views: 52

Re: State property

Heat and work are not considered state properties because they are affected by the paths that they take and are changed by them.
by 305572629
Tue Feb 23, 2021 12:16 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Isolated System
Replies: 9
Views: 23

Re: Isolated System

Yes- there are more limited ways to change an isolated system but it is still possible!
by 305572629
Sun Feb 14, 2021 4:11 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta G
Replies: 9
Views: 31

Re: delta G

The questions are usually pretty clear about which delta G to look for or calculate, but remember that delta G naught is change in gibbs free energy of a reaction under standard conditions, but delta G can change with each different reaction you are looking at.
by 305572629
Sun Feb 14, 2021 4:09 pm
Forum: Phase Changes & Related Calculations
Topic: Entropy of vaporization
Replies: 7
Views: 24

Re: Entropy of vaporization

David Jen 1J wrote:Another question, why is it that the greater the Svap, the more ordered it is?


According to Sapling, "A larger molar entropy of vaporization, which correlates to a greater increase in disorder, indicates a more ordered arrangement of the molecules in the liquid state".
by 305572629
Sun Feb 14, 2021 4:07 pm
Forum: Phase Changes & Related Calculations
Topic: Entropy of vaporization
Replies: 7
Views: 24

Re: Entropy of vaporization

Divide enthalpy (delta h) by the temperature given
by 305572629
Sun Feb 14, 2021 4:02 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Sapling 3
Replies: 13
Views: 68

Re: Sapling 3

When delta h is positive, heat is being absorbed by the system (endothermic), and when something is absorbing heat it is going from solid to liquid, liquid to gas, or solid to gas. Gases have the highest entropies since they have the most room for disorder and the most possible microstate positions,...
by 305572629
Sun Feb 14, 2021 4:00 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Entropy trends from 4H
Replies: 7
Views: 14

Re: Entropy trends from 4H

Larger molecules have more room for higher disorder, which means the entropy would be higher.
by 305572629
Sun Feb 14, 2021 3:58 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy: kJ or J?
Replies: 30
Views: 82

Re: Entropy: kJ or J?

Standard entropy is usually in Joules, but especially when calculating gibbs free energy make sure you convert that to kJ so that the units align with enthalpy.
by 305572629
Sun Feb 07, 2021 1:46 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal (reversible) vs. Irreversible
Replies: 5
Views: 32

Re: Isothermal (reversible) vs. Irreversible

If Pext (external pressure) and Pint (internal pressure) are the same, the system is most likely under irreversible expansion (constant pressure). And if they are different, the system is most likely under reversible (isothermal) expansion.
by 305572629
Sun Feb 07, 2021 1:44 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Sapling #16
Replies: 6
Views: 30

Re: Sapling #16

All you have to do is get all units converted to kj, and then subtract the heat value (q, which is negative since heat is released) and add the work value (which is a positive since work is done ON the system) in order to get delta E, or U (change in internal energy).
by 305572629
Sun Feb 07, 2021 1:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Sapling Week 3/4 #19
Replies: 6
Views: 63

Re: Sapling Week 3/4 #19

There were some questions similar to 19 in previous questions of this assignment. You have to divide the heat released by the calorimeter (q) by the change in temperature to find the heat capacity (c). Then, you take that c and use it for the next given values. Since delta T is given, you are lookin...
by 305572629
Sun Feb 07, 2021 1:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Sapling 20
Replies: 10
Views: 56

Re: Sapling 20

Since the system is held at constant volume, we know that the system is unable to perform work, so the w term is equal to zero. Therefore, delta U (change in internal energy) is equal to the same value of q (heat).
by 305572629
Thu Feb 04, 2021 4:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Entropy (residual)
Replies: 3
Views: 32

Re: Entropy (residual)

Positional/residual entropy also ignores thermal motion and entropy, which is confusing to me because I thought that thermal motion was important to entropy of any system. Why are they different?
by 305572629
Thu Feb 04, 2021 4:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work
Replies: 39
Views: 106

Re: Work

If the system does work by itself, the value will be more negative since energy is required for it to do so. However, when the surroundings do work on the system, they expend their own energy so the work value of the system is positive because it is gaining that energy.
by 305572629
Thu Feb 04, 2021 4:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Sapling Week 3/4 #20
Replies: 5
Views: 50

Re: Sapling Week 3/4 #20

It is important for #20 that you draw out the molecular geometry (with electron lone pairs included!) so that you know which values in the table given to use. For example, in a question similar to this, if you are given something like a Carbon atom (C), you would have to use the molar heat capacity ...
by 305572629
Thu Feb 04, 2021 4:33 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: qreaction
Replies: 3
Views: 9

Re: qreaction

Q of the reaction can be positive or negative, depending on whether the reaction is endothermic (+) or exothermic (-). So whatever amount of heat that the reaction absorbs or releases is taken away from or added to the heat of the calorimeter.
by 305572629
Thu Feb 04, 2021 4:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: W
Replies: 14
Views: 65

Re: W

N is the total number of molecules or particles in the system, so even though there are only two components of each CO molecule, there are 2 CO molecules meaning that there are 4 total components to the system.
by 305572629
Thu Feb 04, 2021 4:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: W
Replies: 14
Views: 65

Re: W

N is the total number of molecules or particles in the system, so even though there are only two components of each CO molecule, there are 2 CO molecules meaning that there are 4 total components to the system.
by 305572629
Sun Jan 24, 2021 11:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy
Replies: 26
Views: 381

Re: Enthalpy

State functions do not rely on the path taken to get from an initial to final value.
by 305572629
Sun Jan 24, 2021 11:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Given in Problems
Replies: 6
Views: 13

Re: Temperature Given in Problems

I think we’re supposed to just assume temperature is 25 degrees Celsius because our calculations don’t really involve temperature right now.
by 305572629
Sun Jan 24, 2021 11:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed system
Replies: 43
Views: 275

Re: closed system

They don’t allow for matter to be exchanged inside and outside of the system!
by 305572629
Sun Jan 24, 2021 11:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use ICE box
Replies: 23
Views: 109

Re: When to use ICE box

Use when given info on a weak acid or base to compare initial and final concentrations.
by 305572629
Sun Jan 24, 2021 11:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Neutral, unknown, or charged?
Replies: 6
Views: 36

Re: Neutral, unknown, or charged?

When pH<pKa for an acid that acid is neutral. In an acid when pH>pKa it is charged.
by 305572629
Sun Jan 24, 2021 11:35 pm
Forum: Phase Changes & Related Calculations
Topic: when to assume x is insignificant
Replies: 83
Views: 193

Re: when to assume x is insignificant

Assume that x is irrelevant in an ICE table when the equilibrium constant is less than 10^-4
by 305572629
Sun Jan 17, 2021 9:18 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 46
Views: 191

Re: Q and K

Q is the reaction quotient and K is the equillibrium constant. If Q>K the reaction will shift left, and if Q<K the reaction will shift right.
by 305572629
Sun Jan 17, 2021 9:15 pm
Forum: Ideal Gases
Topic: Kp?
Replies: 30
Views: 114

Re: Kp?

yes- in some tricky problems liquids and aqueous components may be included, but just emit them since partial pressure can only apply to gases.
by 305572629
Sun Jan 17, 2021 9:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What makes a weak acid?
Replies: 11
Views: 41

Re: What makes a weak acid?

Weak acids consist of all acids besides the 7 strong acids. Additionally, it may help to remember that the conjugate acid of a strong base is a weak acid in some cases.
by 305572629
Sun Jan 17, 2021 9:12 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Kw usage
Replies: 5
Views: 25

Re: Kw usage

It is safe to assume that the Kw value will = 10^-14 in all equilibrium systems at 25 degrees Celsius.
by 305572629
Sun Jan 17, 2021 9:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 19
Views: 134

Re: Le Chatelier's Principle

Le Chatelier's principle states that a system at equilibrium reacts in a way/shifts in the direction that minimizes the stress applied to that system.
by 305572629
Sun Jan 10, 2021 7:35 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 74
Views: 515

Re: PV=nRT

P= pressure (atm); V= volume (Liters); n=moles; R=gas constant (no units needed); T=temperature (Kelvin)
by 305572629
Sun Jan 10, 2021 7:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Disregarding X
Replies: 3
Views: 11

Re: Disregarding X

k must be a very small quantity, as mentioned above, in order to disregard x. If K is greater than 10^-4 and you disregard x, it can throw off your answers and your values of final and initial concentrations of x may be incorrect.
by 305572629
Sun Jan 10, 2021 7:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: increasing total pressure in equilibria
Replies: 11
Views: 67

Re: increasing total pressure in equilibria

When there is an increase in pressure, the equilibrium will shift to whichever side of the equation has fewer moles of gas.
by 305572629
Sun Jan 10, 2021 10:20 am
Forum: Ideal Gases
Topic: PV=nRT and concentration
Replies: 27
Views: 131

Re: PV=nRT and concentration

molarity, usually in brackets [] like when we try to calculate K or Q by dividing concentration (molarity) of products / concentration (molarity) of reactants, is a measure of moles per liter of chemicals in these reactions. So for the purpose of K and Q problems, the molarity and moles are usually ...
by 305572629
Sun Jan 10, 2021 10:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 13
Views: 57

Re: Q and K

Yes. Q is used as a tool to decipher whether the system is at equilibrium, tends towards the product side of the reaction (Q>K), or tends towards the reactant side of the reaction (Q<K).
by 305572629
Sun Dec 06, 2020 10:14 am
Forum: Resonance Structures
Topic: Stability
Replies: 13
Views: 113

Re: Stability

Delocalized electrons lower the overall energy of the molecule in a resonance structure making it more stable
by 305572629
Sun Dec 06, 2020 9:32 am
Forum: Lewis Acids & Bases
Topic: Water
Replies: 62
Views: 545

Re: Water

It depends on the situation- it can act as either wherever necessary because it is made up of an acidic component (H+) and a basic component (OH-)!
by 305572629
Sun Dec 06, 2020 9:31 am
Forum: Identifying Acidic & Basic Salts
Topic: 6D.11
Replies: 3
Views: 14

Re: 6D.11

That's a great question! don't think too much on this one- just know that one of the 6 H2Os from the left side of the equation has to give up an H to the lone water molecule on the left in order to create the H3O+ on the right side (since this is an acid-base reaction). So, you just remove one of th...
by 305572629
Sun Dec 06, 2020 9:29 am
Forum: Amphoteric Compounds
Topic: Memorization?
Replies: 10
Views: 202

Re: Memorization?

Yes I would definitely recommend memorizing the amphoteric oxide compounds (oxides and the other molecules)
by 305572629
Sun Dec 06, 2020 9:26 am
Forum: General Science Questions
Topic: State of a molecule
Replies: 6
Views: 67

Re: State of a molecule

No- we shouldn't have to know that for this course! If anything, assume normally that the diatomic molecules N2 and O2 and common molecules like CO2 are in their gaseous state, and that metals are solids, but other than that I don't believe we are responsible for knowing states of molecules.
by 305572629
Sun Dec 06, 2020 9:24 am
Forum: Hybridization
Topic: pi bonds
Replies: 6
Views: 104

Re: pi bonds

There would be two pi bonds in CH3CN since there is a triple bond between the second carbon and the nitrogen atom in the lewis structure. You can find unhybridized orbitals from an electron configuration first by drawing the normal electron configuration, then combining (hybridizing) the highest ene...
by 305572629
Sun Dec 06, 2020 9:16 am
Forum: Naming
Topic: Oxidation State
Replies: 16
Views: 77

Re: Oxidation State

The oxidation states of groups 1 and 2 are usually the cations they create,and the oxidation states of groups 3-8 are the anions they create (ex: Oxygen is -2) but transition metals can very so we have to find them based on the oxidation states of elements that we already know.
by 305572629
Sun Nov 29, 2020 7:42 pm
Forum: Student Social/Study Group
Topic: Expanded Octet
Replies: 4
Views: 37

Re: Expanded Octet

I usually draw out the lewis structure first, and if it seems to not make sense in any other way than adding lone pairs to the octet of the central atoms, that is how I know it can have an expanded octet (so long as it is in group 3a or after)
by 305572629
Sun Nov 29, 2020 7:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: non polar bonds/polar molecules
Replies: 6
Views: 23

Re: non polar bonds/polar molecules

Nonpolar molecules can have polar bonds and still be nonpolar; polar molecules must have polar bonds to be polar.
by 305572629
Sun Nov 29, 2020 7:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to determine negative poles? (Week 8 Sapling Q10)
Replies: 9
Views: 72

Re: How to determine negative poles? (Week 8 Sapling Q10)

From what I understood, whichever molecules/bonds have the strongest dipole moments are where the poles of the molecule are the most negative.
by 305572629
Sun Nov 29, 2020 7:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H20 Shape
Replies: 17
Views: 125

Re: H20 Shape

The two lone pairs have strong repulsion forces and cause the two hydrogen atoms attached to the oxygen central atom to be bent at an angle, so it is not linear molecular geometry.
by 305572629
Sun Nov 29, 2020 7:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Molecular Shape
Replies: 9
Views: 52

Re: Determining Molecular Shape

No- only lone pairs will affect molecular shape/geometry
by 305572629
Sun Nov 22, 2020 4:40 pm
Forum: Resonance Structures
Topic: Resonance Structures and Energy
Replies: 21
Views: 127

Re: Resonance Structures and Energy

More spread out charges and preferably charges that are not on the center (least electronegative) atom are the most energetically favorable resonance structures.
by 305572629
Sun Nov 22, 2020 4:38 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 33
Views: 240

Re: Covalent Character

the greater the covalent character, the smaller the difference in electronegativity which means the atoms are closer to equally sharing those electrons!
by 305572629
Sun Nov 22, 2020 4:36 pm
Forum: Bond Lengths & Energies
Topic: Bond Length vs Size of Molecule
Replies: 14
Views: 149

Re: Bond Length vs Size of Molecule

bond length generally increases as atomic radius increases (down the periodic table and towards the left)
by 305572629
Sun Nov 22, 2020 4:34 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Best Formal Charge Equations
Replies: 24
Views: 142

Re: Best Formal Charge Equations

the equation that I use is "valence electrons on the periodic table - lines - dots"
by 305572629
Sun Nov 22, 2020 4:32 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 114
Views: 606

Re: Exercising Our Minds and Bodies

I like to watch pop pilates videos on youtube and do long distance running!
by 305572629
Sun Nov 15, 2020 11:51 pm
Forum: Student Social/Study Group
Topic: Midterm 2 content
Replies: 20
Views: 168

Re: Midterm 2 content

I think the best prep for this midterm is definitely all of the lecture notes and textbook problems because it is less math and more practicing structures to be prepared for what we may see.
by 305572629
Sun Nov 15, 2020 11:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Transition Metal Electrons
Replies: 3
Views: 52

Re: Transition Metal Electrons

Don't worry about the transition metals as much, for now. There are a lot of exceptions and we are mainly focusing on the s and p shells when looking at bonding for right now.
by 305572629
Sun Nov 15, 2020 11:44 pm
Forum: Octet Exceptions
Topic: octet rule
Replies: 8
Views: 77

Re: octet rule

Cl can expand its octet, but it actually only has 7 valence electrons normally. It has 17 electrons total, and to complete its octet it tries to obtain one more electron normally.
by 305572629
Sun Nov 15, 2020 11:43 pm
Forum: Student Social/Study Group
Topic: Class grade
Replies: 18
Views: 160

Re: Class grade

What are the benefits to changing it to pass/no pass or does it hurt our GPA in any way?
by 305572629
Sun Nov 15, 2020 11:41 pm
Forum: Resonance Structures
Topic: bond length
Replies: 37
Views: 191

Re: bond length

no- all bond lengths in specific numbers should be given to us. If we ever have to figure out a bond length, just use a general periodic trend to make an estimate.
by 305572629
Sun Nov 15, 2020 11:29 pm
Forum: Resonance Structures
Topic: Resonance of Hydrogen phosphate
Replies: 2
Views: 16

Re: Resonance of Hydrogen phosphate

The reason the Oxygen bonds and stays with the Hydrogen atom through the different resonance structures is that the oxygen is meant to bind to the hydrogen atom and have it instead of another lone pair of electrons. There are also intramolecular forces at play having to do with electronegativity tha...
by 305572629
Sun Nov 08, 2020 11:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: Are there subshells past f?
Replies: 28
Views: 177

Re: Are there subshells past f?

There are higher subshells past f, but we will not be learning about them in this intro to chemistry class!
by 305572629
Sun Nov 08, 2020 11:56 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 199

Re: Forming Virtual Study Group

Me too! my email is suttonsellars22@ucla.edu
by 305572629
Sun Nov 08, 2020 11:55 pm
Forum: Student Social/Study Group
Topic: Test Anxiety
Replies: 62
Views: 357

Re: Test Anxiety

The exam was really stressful so it would be great to study with a group before the next one to avoid any test anxiety- support really helps.
by 305572629
Sun Nov 08, 2020 11:55 pm
Forum: Lewis Structures
Topic: Shape
Replies: 3
Views: 12

Re: Shape

Go in order from lowest energy level up!
by 305572629
Sun Nov 08, 2020 11:54 pm
Forum: Octet Exceptions
Topic: specific exceptions
Replies: 3
Views: 11

Re: specific exceptions

I think that for now, we need to assume that every element follow the octet rule.
by 305572629
Sun Nov 01, 2020 9:53 pm
Forum: Trends in The Periodic Table
Topic: positive and negative ion
Replies: 14
Views: 79

Re: positive and negative ion

The above statements are true, but remember to look at the element's location on the periodic table because as you go closer and closer to the bottom left corner, the radius gets bigger, then you must remember to consider whether or not it is an ion (positive or negative).
by 305572629
Sun Nov 01, 2020 9:51 pm
Forum: Properties of Electrons
Topic: question about diffraction
Replies: 4
Views: 39

Re: question about diffraction

The electrons must bend in order to go through the slits in this experiment because they cannot go straight through, as particles would. This means they must have wavelike properties as well as particle-like properties.
by 305572629
Sun Nov 01, 2020 9:42 pm
Forum: Photoelectric Effect
Topic: N initial vs. N final
Replies: 7
Views: 107

Re: N initial vs. N final

Make sure to read the question several times to make 100% sure that you know if it's giving you N initial or N final. One way you may find out if you use the wrong one is if you get a non-whole number or a negative number.
by 305572629
Sun Nov 01, 2020 9:41 pm
Forum: Properties of Light
Topic: How to remember what v is in equations
Replies: 46
Views: 276

Re: How to remember what v is in equations

Tip: if something says Hertz or cycles per second, it is talking about frequency. Velocity is also a regular lowercase v and frequency is a cursive-looking v in equations.
by 305572629
Sun Nov 01, 2020 9:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin state
Replies: 25
Views: 205

Re: Spin state

In order to check yourself and determine the correct spin state, draw out the diagram for each quantum number
by 305572629
Sun Nov 01, 2020 9:21 pm
Forum: Photoelectric Effect
Topic: Lyman Series
Replies: 30
Views: 220

Re: Lyman Series

Always remember: Lyman series N1 is 1 and Balmer series N1 is 2.
by 305572629
Sun Nov 01, 2020 9:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm scores
Replies: 15
Views: 119

Re: Midterm scores

Does anyone know if the next midterm and final exam will be multiple choice?
by 305572629
Sun Nov 01, 2020 9:18 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 10
Views: 172

Re: Electronegativity

As valence electrons in a shell get higher and closer to 8, they want that last electron very strongly, making the electronegativity of that element strong. For example, Chlorine has a very high electronegativity because it has 7 valence electrons.
by 305572629
Sun Nov 01, 2020 9:16 pm
Forum: DeBroglie Equation
Topic: When to Use De Broglie
Replies: 16
Views: 130

Re: When to Use De Broglie

Make sure to be familiar with the De Broglie wavelength equation and the other equations for frequency and wavelength using the speed of light and Planck's constant so that you can interchange them easily.
by 305572629
Sun Nov 01, 2020 9:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling Question Number 20
Replies: 4
Views: 39

Re: Sapling Question Number 20

The periodic trend for ionization and electron affinity is the same: the closer to the top right of the periodic table, the stronger. For atomic radius: the closer to the bottom left, the larger the radius
by 305572629
Sun Oct 18, 2020 3:23 pm
Forum: Student Social/Study Group
Topic: studying for exams
Replies: 21
Views: 320

Re: studying for exams

Is anyone interested in forming a study group? We could find different practice problems from each section before midterms and exams and share them/work together on them!
by 305572629
Sun Oct 18, 2020 3:22 pm
Forum: DeBroglie Equation
Topic: Names of equations
Replies: 8
Views: 39

Re: Names of equations

In the past, my teachers have told me not to memorize equations but sometimes it is easier just to memorize them to save time on assessments, especially when you are timed. It also helps to feel more confident when answering questions.
by 305572629
Sun Oct 18, 2020 3:19 pm
Forum: Properties of Light
Topic: Example during lecture 6
Replies: 5
Views: 90

Re: Example during lecture 6

I wish I could help you with that- I didn't realize he removed the negative sign. Maybe the next equation had a negative in front of that variable and they cancelled out?
by 305572629
Sun Oct 18, 2020 3:18 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1384

Re: How are you studying?

I'm struggling with studying because although I have learned about all of these topics previously, they can become confusing and sometimes questions are worded difficultly. So, I am looking up a bunch of old practice problems for these topics that I used in AP Chemistry in high school just to make s...
by 305572629
Sun Oct 18, 2020 3:16 pm
Forum: Properties of Light
Topic: Energy from shorter wavelength
Replies: 5
Views: 47

Re: Energy from shorter wavelength

If the energy coming into the atom (electron) has a "higher energy," it means that the energy of each photon is higher, and also has a higher frequency, and therefore has a shorter wavelength of light energy.
by 305572629
Sat Oct 10, 2020 5:13 pm
Forum: Photoelectric Effect
Topic: Threshold Energy vs. Binding Energy
Replies: 3
Views: 13

Re: Threshold Energy vs. Binding Energy

Threshold energy is the energy that an electron must overcome to break away with the incoming energy of a photon, and binding energy is the energy that is keeping that electron in its place orbitting around its atom.
by 305572629
Sat Oct 10, 2020 5:12 pm
Forum: Student Social/Study Group
Topic: Study Group On Campus
Replies: 5
Views: 54

Re: Study Group On Campus

I am on campus too, and I would love to join a study group.
by 305572629
Sat Oct 10, 2020 5:09 pm
Forum: Photoelectric Effect
Topic: Question 31 on Module
Replies: 4
Views: 36

Re: Question 31 on Module

The same thing happened to me! I attempted the problem several different ways, but I could not reach the correct answer.
by 305572629
Sat Oct 10, 2020 5:07 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Hw 1 #10
Replies: 5
Views: 47

Re: Sapling Hw 1 #10

You actually don't need to write out the equation- just assume based on the "image" in the problem that the molar ratio for each molecule is 1, and you can use the values given to answer the question.
by 305572629
Sat Oct 10, 2020 5:03 pm
Forum: Properties of Light
Topic: Photoelectric Effect Post-Module Assessment #33
Replies: 4
Views: 59

Re: Photoelectric Effect Post-Module Assessment #33

Does anyone know how to know whether to use use the Ephoton equation versus the other energy/wavelength equations?
by 305572629
Sat Oct 10, 2020 4:57 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 199

Re: Forming Virtual Study Group

I would love to be a part of a virtual study group!

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