Search found 69 matches

by Alison Trinh 1E
Sun Jan 26, 2020 11:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Signs for enthalpy
Replies: 8
Views: 13

Re: Signs for enthalpy

Positive enthalpies are equivalent to endothermic reactions that take up heat. Enthalpies can be expressed as negative when a reaction is exothermic and therefore releases heat and warms the surroundings.
by Alison Trinh 1E
Sun Jan 26, 2020 11:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: The 3 methods
Replies: 4
Views: 20

Re: The 3 methods

Why is it necessary to know all three methods?
by Alison Trinh 1E
Sun Jan 26, 2020 11:45 pm
Forum: Phase Changes & Related Calculations
Topic: ∆H
Replies: 15
Views: 37

Re: ∆H

What does DeltaH represent?
by Alison Trinh 1E
Sun Jan 26, 2020 11:40 pm
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 6
Views: 20

State Property

Can someone define state property for me please? Thank you.
by Alison Trinh 1E
Thu Jan 23, 2020 7:41 pm
Forum: Student Social/Study Group
Topic: Sapling Learning
Replies: 3
Views: 14

Sapling Learning

To anyone who has the Sapling Learning supplement, what are your thoughts on it and how has it helped you?
by Alison Trinh 1E
Sun Jan 19, 2020 10:09 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Base Concentration
Replies: 3
Views: 15

Acid and Base Concentration

Can we determine whether an acid or base is weak or strong by calculating their concentrations?
by Alison Trinh 1E
Sun Jan 19, 2020 9:57 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Quadratic Equation
Replies: 8
Views: 24

Quadratic Equation

When/why do we use the quadratic equation in terms of chemical equilibrium?
by Alison Trinh 1E
Sun Jan 19, 2020 9:46 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Test 1
Replies: 6
Views: 23

Re: Test 1

What would you say are the best ways to practice for the test?
by Alison Trinh 1E
Sun Jan 19, 2020 9:40 am
Forum: Ideal Gases
Topic: PV=nRT
Replies: 13
Views: 50

PV=nRT

When would we use this equation in relation to chemical equilibrium?
by Alison Trinh 1E
Sun Jan 19, 2020 9:38 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases Ice Box
Replies: 5
Views: 25

Re: Acids and Bases Ice Box

What is the purpose of an ICE Box?
by Alison Trinh 1E
Sun Jan 12, 2020 10:42 pm
Forum: Ideal Gases
Topic: ICE Table
Replies: 9
Views: 54

Re: ICE Table

What is an ICE table?
by Alison Trinh 1E
Sun Jan 12, 2020 10:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration
Replies: 6
Views: 22

Concentration

Why do we not use units for concentration?
by Alison Trinh 1E
Sun Jan 12, 2020 10:02 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Partial Pressure
Replies: 19
Views: 48

Re: Partial Pressure

What exactly is partial pressure and how does it relate to chemical equilibrium?
by Alison Trinh 1E
Sun Jan 12, 2020 10:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q
Replies: 10
Views: 25

Q

What is the purpose of finding Q? Is it just to determine the direction of the reaction?
by Alison Trinh 1E
Sun Jan 12, 2020 9:59 pm
Forum: Ideal Gases
Topic: Law of Mass Action
Replies: 3
Views: 32

Law of Mass Action

In the textbook, it discusses the law of mass action and how it relates to equilibrium, but I can't seem to grasp the idea. Could someone clarify what the law is and how it relates to chemical equilibrium?
by Alison Trinh 1E
Sun Dec 08, 2019 5:42 am
Forum: Student Social/Study Group
Topic: Study tips
Replies: 7
Views: 47

Re: Study tips

I have also found that Khan Academy is good for review and studying.
by Alison Trinh 1E
Sun Dec 08, 2019 5:40 am
Forum: Student Social/Study Group
Topic: Grades
Replies: 14
Views: 152

Re: Grades

I have heard that if you receive 250 points out of the 500 you should be able to pass the class with a C-
by Alison Trinh 1E
Sun Dec 08, 2019 5:38 am
Forum: Student Social/Study Group
Topic: Practice Final
Replies: 17
Views: 233

Re: Practice Final

The marshmallow review session and going over old tests would be a good way to review since there was no practice final.
by Alison Trinh 1E
Sun Dec 08, 2019 5:36 am
Forum: Student Social/Study Group
Topic: Study tips
Replies: 7
Views: 47

Re: Study tips

Using the Marshmallow and Dino Nuggets review problems have also been helpful for me.
by Alison Trinh 1E
Sun Dec 08, 2019 5:35 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Strong Acids
Replies: 2
Views: 22

Strong Acids

How can you tell whether an acid is strong or weak? Would you consider relative acidity to do so?
by Alison Trinh 1E
Sun Dec 01, 2019 11:56 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: seesaw
Replies: 4
Views: 40

seesaw

What exactly is the conjugate seesaw and why is it important?
by Alison Trinh 1E
Sun Dec 01, 2019 11:53 pm
Forum: Polyprotic Acids & Bases
Topic: ligands
Replies: 4
Views: 44

ligands

In what ways are ligands relevant to the topic of acids and bases?
by Alison Trinh 1E
Sun Dec 01, 2019 11:52 pm
Forum: Identifying Acidic & Basic Salts
Topic: Relative Acidity
Replies: 2
Views: 20

Relative Acidity

Why is it that the resulting anion after a strong acid easily loses an H+ must be stable?
by Alison Trinh 1E
Sun Dec 01, 2019 11:50 pm
Forum: Identifying Acidic & Basic Salts
Topic: identifying acids and bases
Replies: 4
Views: 38

Re: identifying acids and bases

An acid is considered a Lewis acid if an electron pair can be accepted. A Lewis base would be considered an electron pair donor.
by Alison Trinh 1E
Sun Dec 01, 2019 11:48 pm
Forum: Identifying Acidic & Basic Salts
Topic: How to tell
Replies: 3
Views: 25

Re: How to tell

To further elaborate, Bronsted acids are considered proton donors. It is a Lewis acid if an electron pair is accepted. A Bronsted base is considered a proton receptor. A Lewis base is considered an electron pair donor.
by Alison Trinh 1E
Sun Dec 01, 2019 11:45 pm
Forum: Identifying Acidic & Basic Salts
Topic: Neutralization
Replies: 3
Views: 183

Re: Neutralization

What is the purpose of neutralization?
by Alison Trinh 1E
Sun Nov 24, 2019 11:45 pm
Forum: Naming
Topic: polydentate?
Replies: 7
Views: 40

Re: polydentate?

What exactly does the suffix "-dentate" refer to?
by Alison Trinh 1E
Sun Nov 24, 2019 11:40 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: coordination compound
Replies: 2
Views: 202

Re: coordination compound

What does a coordination compound refer to and why are they necessary?
by Alison Trinh 1E
Sun Nov 24, 2019 11:37 pm
Forum: Conjugate Acids & Bases
Topic: Cojugate Acids and Bases
Replies: 10
Views: 341

Re: Cojugate Acids and Bases

Can someone clarify what a conjugate acid or conjugate base is exactly?
by Alison Trinh 1E
Sun Nov 24, 2019 11:35 pm
Forum: Lewis Acids & Bases
Topic: When does a complex become a chelate?
Replies: 3
Views: 24

Re: When does a complex become a chelate?

Also, to add on to the previous comment, the central atom should be a central metal atom.
by Alison Trinh 1E
Sun Nov 24, 2019 11:31 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Ligands
Replies: 5
Views: 27

Re: Ligands

Can someone explain what exactly a ligand is?
by Alison Trinh 1E
Sun Nov 17, 2019 8:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Same Molecular Formula, Different Shape
Replies: 2
Views: 16

Same Molecular Formula, Different Shape

What causes a molecule to have a different molecular shape than another molecule with the same molecular formula such as in the case of pentane and 2, 2 dimethylpropane?
by Alison Trinh 1E
Sun Nov 17, 2019 8:01 pm
Forum: Hybridization
Topic: Hydrogen Bonding
Replies: 2
Views: 18

Hydrogen Bonding

My TA said hydrogen bonding would appear on Test 2. Could someone explain to me or give me and example of how this could appear on the test? Like what kind of problem should we expect on this topic?
by Alison Trinh 1E
Sun Nov 17, 2019 7:58 pm
Forum: Hybridization
Topic: VSEPR Models
Replies: 1
Views: 14

VSEPR Models

What is the difference between a VSEPR Model and a Lewis Structure?
by Alison Trinh 1E
Sun Nov 17, 2019 2:46 pm
Forum: Hybridization
Topic: Homework Outline for Test
Replies: 5
Views: 41

Homework Outline for Test

Which homework outlines should we be focusing on in preparation for Test 2?
by Alison Trinh 1E
Sun Nov 17, 2019 2:37 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 81

Test 2 Topics

Could someone please provide a list of what we should expect to be on Test 2? Thank you!
by Alison Trinh 1E
Fri Nov 08, 2019 2:34 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: Shape of Molecule
Replies: 5
Views: 25

Shape of Molecule

Just to clarify, differences in characteristics such as boiling point of two different molecules that have the same molecular formula can be attributed to their different shapes?
by Alison Trinh 1E
Sun Nov 03, 2019 8:08 pm
Forum: Sigma & Pi Bonds
Topic: Quantum Numbers
Replies: 9
Views: 62

Quantum Numbers

What is the importance/significance of knowing the quantum numbers of orbitals?
by Alison Trinh 1E
Sun Nov 03, 2019 8:05 pm
Forum: Electronegativity
Topic: which bond
Replies: 4
Views: 40

Re: which bond

If the electronegativity difference is between 1.5 and 2 then it is a mix of the two bonds.
by Alison Trinh 1E
Sun Nov 03, 2019 8:04 pm
Forum: Lewis Structures
Topic: Which element at center of the structure
Replies: 6
Views: 29

Re: Which element at center of the structure

The element with the lowest ionization energy or the element with the least electronegativity is the central atom.
by Alison Trinh 1E
Sun Nov 03, 2019 8:01 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 3
Views: 37

Re: Drawing Resonance Structures

I believe you can either draw all of the possible structures or draw the "actual structure", which is a hybrid of a molecule's resonance structures.
by Alison Trinh 1E
Sun Nov 03, 2019 7:57 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 9
Views: 52

Re: Electronegativity

It is also helpful to keep in mind that electronegativity increases as it gets closer to Flourine on the periodic table.
by Alison Trinh 1E
Mon Oct 28, 2019 4:36 pm
Forum: Administrative Questions and Class Announcements
Topic: 10/28 Updates due to Fire [ENDORSED]
Replies: 14
Views: 845

Re: 10/28 Updates due to Fire [ENDORSED]

Yes, that is the session I am referring to @Rebecca! Thank you so much!
by Alison Trinh 1E
Mon Oct 28, 2019 2:38 pm
Forum: Administrative Questions and Class Announcements
Topic: 10/28 Updates due to Fire [ENDORSED]
Replies: 14
Views: 845

Re: 10/28 Updates due to Fire [ENDORSED]

Is the midterm review session at 6 today also cancelled? Thank you!
by Alison Trinh 1E
Sun Oct 27, 2019 11:43 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 12
Views: 63

Re: Lone Pairs

Can lone pairs become bonds?
by Alison Trinh 1E
Sun Oct 27, 2019 11:39 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 77

Re: Covalent Bonds

Covalent bonds form between nonmetals whereas ionic bonds are formed when electrons transfer from metal to nonmetal. This is because nonmetals don't form cations and therefore share electrons to form covalent bonds.
by Alison Trinh 1E
Sun Oct 27, 2019 11:33 pm
Forum: Resonance Structures
Topic: Octet
Replies: 13
Views: 84

Re: Octet

The octet rule refers to the covalent bonds that atoms share until a noble gas configuration is reached.
by Alison Trinh 1E
Sun Oct 27, 2019 11:31 pm
Forum: Resonance Structures
Topic: Resonance Structure meaning
Replies: 6
Views: 27

Re: Resonance Structure meaning

Resonance is a blending of structures with the same atom arrangement but different electron arrangements.
by Alison Trinh 1E
Sun Oct 27, 2019 11:27 pm
Forum: Lewis Structures
Topic: Lewis symbols
Replies: 5
Views: 28

Re: Lewis symbols

There should be a total number of 8 valence electrons (think octet rule).
by Alison Trinh 1E
Sun Oct 20, 2019 11:35 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 2
Views: 24

Re: Schrodinger's Equation

What does each variable in the Schrodinger equation shown above represent?
by Alison Trinh 1E
Sun Oct 20, 2019 11:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Multi-electron atoms
Replies: 7
Views: 31

Re: Multi-electron atoms

What additional factors effect electron energy in multi-electron atoms?
by Alison Trinh 1E
Sun Oct 20, 2019 11:28 pm
Forum: *Shrodinger Equation
Topic: Schrodinger equation
Replies: 4
Views: 35

Re: Schrodinger equation

How does the Schrodinger equation apply to orbitals?
by Alison Trinh 1E
Sun Oct 20, 2019 11:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 507

Re: Advice for studying

Rewatching Dr. Lavelle's video modules, doing the homework/practice problems, and attending step-up sessions have been very helpful for me in terms of studying and trying to really understand the material!
by Alison Trinh 1E
Sun Oct 20, 2019 11:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s-, p-, d- ,f- orbitals
Replies: 10
Views: 82

Re: s-, p-, d- ,f- orbitals

Just to clarify, why are s, p, d, and f orbitals categorized like this? Is it because of their differences in their nodal planes, number of orbitals, energy levels, etc.? Thank you!
by Alison Trinh 1E
Sat Oct 12, 2019 5:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Frequency
Replies: 15
Views: 141

Re: Frequency

Frequency and energy are directly proportional in that when frequency increases so does the kinetic energy. This causes electrons to be ejected.
by Alison Trinh 1E
Sat Oct 12, 2019 4:38 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 4
Views: 47

Re: Wave Properties of Electrons

Also, it was mentioned during lecture that electrons must have wavelike properties because they give rise to a diffraction pattern that result from interacting waves.
by Alison Trinh 1E
Sat Oct 12, 2019 4:30 pm
Forum: Properties of Electrons
Topic: Measuring wavelike properties
Replies: 3
Views: 32

Re: Measuring wavelike properties

The reason the cutoff is 10^-15m is simply because that is because wavelength properties that are anything less than that are not detectable.
by Alison Trinh 1E
Sat Oct 12, 2019 4:19 pm
Forum: Einstein Equation
Topic: Atomic Spectra
Replies: 2
Views: 53

Re: Atomic Spectra

The question may be similar to chemical yield questions asking how the theoretical yield compares to the actual yield. In this case, the question may be asking to compare spectroscopic results (similar to the theoretical yield or what the supposed results are) to what is actually calculated in the e...
by Alison Trinh 1E
Sat Oct 12, 2019 3:45 pm
Forum: Properties of Light
Topic: Intensity of Light
Replies: 4
Views: 42

Re: Intensity of Light

Increasing the intensity of light increases the number of photons. However, to eject an electron, the frequency needs to increase to increase the kinetic energy and thus release/eject the electron. The energy per photon has to be greater or equal to the energy needed to remove an electron.
by Alison Trinh 1E
Thu Oct 03, 2019 10:34 pm
Forum: Limiting Reactant Calculations
Topic: Clarification
Replies: 4
Views: 71

Re: Clarification

Yes the limiting reactant will get you to your theoretical/maximum yield because the limiting reactant limits the total amount of product formed.
by Alison Trinh 1E
Thu Oct 03, 2019 10:12 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 12
Views: 118

Re: Combustion

Yes because combustion occurs when there is burning of something in the presence of oxygen. When this occurs, energy is released and carbon dioxide and water are yielded as by products.
by Alison Trinh 1E
Thu Oct 03, 2019 10:08 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 116
Views: 11271

Re: All students read this sig fig post [ENDORSED]

When in doubt about sig figs, pay attention to how many sig figs that the values given in the question have.
by Alison Trinh 1E
Thu Oct 03, 2019 9:56 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 8
Views: 125

Re: Avogadro's Number

Avogadro's number is used when converting from the number of "things" or "objects" such as atoms or molecules to the chemical amount (the number of moles).
by Alison Trinh 1E
Thu Oct 03, 2019 9:51 pm
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 123

Re: Test Materials

Regarding test materials, remember to bring a NON-GRAPHING SCIENTIFIC CALCULATOR!!

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