Search found 57 matches

by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:16 pm
Forum: Student Social/Study Group
Topic: Chemistry Community
Replies: 3
Views: 309

Re: Chemistry Community

I heard it was 3 times a week last quarter , but i think it might depend on how your TA grades
by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:14 pm
Forum: General Science Questions
Topic: sig figs
Replies: 4
Views: 147

Re: sig figs

sig figs are usually 2 digits rounded
by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:14 pm
Forum: General Science Questions
Topic: SIG FIGS
Replies: 5
Views: 215

Re: SIG FIGS

it is usually two digits rounded
by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry community posts
Replies: 5
Views: 252

Re: Chemistry community posts

I think you have to post 3 times a week , thats what he said last quarter but im not sure about this one
by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade Release Date?
Replies: 7
Views: 238

Re: Final Grade Release Date?

I think we can pick it up after spring break starting week 3.
by Jaqueline Monreal 2L
Sun Mar 17, 2019 7:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 56215

Re: Advice from a Medical Student [ENDORSED]

Thank you for the advice ! I'll be sure to save my notes for later
by Jaqueline Monreal 2L
Sun Mar 03, 2019 6:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta G = 0 ??
Replies: 5
Views: 159

Re: delta G = 0 ??

delta G= 0: rxn is at equilibrium
by Jaqueline Monreal 2L
Sun Mar 03, 2019 6:46 pm
Forum: Balancing Redox Reactions
Topic: Adding H+ and H2O
Replies: 13
Views: 195

Re: Adding H+ and H2O

you add both in order to balance the Hs and Os on each side of the reaction
by Jaqueline Monreal 2L
Sun Mar 03, 2019 6:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Scores
Replies: 6
Views: 98

Re: Test 2 Scores

probably during our next discussion
by Jaqueline Monreal 2L
Sun Feb 24, 2019 9:08 pm
Forum: Balancing Redox Reactions
Topic: Which Equation to Flip?
Replies: 9
Views: 134

Re: Which Equation to Flip?

i flip the anode equation
by Jaqueline Monreal 2L
Sun Feb 24, 2019 9:07 pm
Forum: Student Social/Study Group
Topic: Test #2
Replies: 7
Views: 119

Re: Test #2

gibbs free energy, electrochemistry
by Jaqueline Monreal 2L
Sun Feb 24, 2019 9:05 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Spontaneous?
Replies: 13
Views: 142

Re: Spontaneous?

they are usually spontaneous if they're values are negative, meaning they are releasing energy
by Jaqueline Monreal 2L
Sun Feb 17, 2019 9:55 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Midterm Grades
Replies: 35
Views: 571

Re: Midterm Grades

next week during discussion
by Jaqueline Monreal 2L
Sun Feb 17, 2019 9:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta G
Replies: 3
Views: 52

Re: delta G

delta G tells us if a reaction releases( if delta G is negative) or absorbs ( if delta G is positive) energy
by Jaqueline Monreal 2L
Sun Feb 17, 2019 9:52 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 3
Views: 52

Re: Gibbs Free Energy

higher negative gibbs free energy doesnt affect the rate of reaction, it just mean that the reaction will release more energy
by Jaqueline Monreal 2L
Sun Feb 10, 2019 7:30 pm
Forum: Phase Changes & Related Calculations
Topic: heat units
Replies: 3
Views: 71

Re: heat units

i think it would be best to convert to J in case
by Jaqueline Monreal 2L
Sun Feb 10, 2019 7:29 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: calculation of change in entropy
Replies: 3
Views: 56

Re: calculation of change in entropy

you do both the method for calculating change in volume: deltaS= nR ln(V2/V1) and for change in temperature: change in delta S= C ln(T2/T1) , and then add the two entropies
by Jaqueline Monreal 2L
Sun Feb 03, 2019 6:26 pm
Forum: Phase Changes & Related Calculations
Topic: Type of systems
Replies: 12
Views: 201

Re: Type of systems

they are different systems- and closed system can exchange energy but not matter with its surroundings while an isolated system cant exchange either one
by Jaqueline Monreal 2L
Sun Feb 03, 2019 6:15 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 2nd law of thermodynamics
Replies: 5
Views: 67

Re: 2nd law of thermodynamics

the second law says that energy transformation is not 100% efficient, the degree of disorder of the universe increases with every transformation
by Jaqueline Monreal 2L
Sun Feb 03, 2019 6:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: isolated vs closed system
Replies: 7
Views: 107

Re: isolated vs closed system

Isolated system: cannot exchange energy or matter with surroundings
Closed system: can exchange energy, nut not matter with surroundings
by Jaqueline Monreal 2L
Sun Jan 27, 2019 9:04 pm
Forum: Phase Changes & Related Calculations
Topic: Memorizing unit conversions?
Replies: 3
Views: 46

Re: Memorizing unit conversions?

i dont think its necessary to memorize any units , it may be helpful but i think the conversions will be provided when needed
by Jaqueline Monreal 2L
Sun Jan 27, 2019 9:03 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Catalysts in Kc
Replies: 6
Views: 101

Re: Catalysts in Kc

catalysts only change how fast a reaction is performed but doesnt change any of the concentrations
by Jaqueline Monreal 2L
Sun Jan 27, 2019 9:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: ICE
Replies: 19
Views: 256

Re: ICE

concentration at equilibrium
by Jaqueline Monreal 2L
Sun Jan 20, 2019 7:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Is it an acid or a base?
Replies: 8
Views: 143

Re: Is it an acid or a base?

an acids donates a proton H+ and a base accepts the proton
by Jaqueline Monreal 2L
Sun Jan 20, 2019 7:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in Temperature
Replies: 8
Views: 108

Re: Changes in Temperature

endothermic- formation of products is favored by a increase in temperature
raising the temperature of a reaction mixture at equilibrium will shift the reaction in the endothermic direction
exothermic- formation of products is favored by a decrease in temperature
by Jaqueline Monreal 2L
Sun Jan 20, 2019 7:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka and Kb as Inverses?
Replies: 7
Views: 117

Re: Ka and Kb as Inverses?

the safest thing to do is use the acid base formula to make sure
by Jaqueline Monreal 2L
Sun Jan 13, 2019 8:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equations
Replies: 10
Views: 121

Re: equations

Usually the reactant are on the right and the products on the left seen using the basic model equation Aa+Bb<->Cc+Dd
by Jaqueline Monreal 2L
Sun Jan 13, 2019 8:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 4
Views: 55

Re: Q and K

Q: gives the reaction quotient at any moment
K: gives the reaction quotient at equilibrium
Q<K : forward reaction favored
Q>K : reverse reaction favored
by Jaqueline Monreal 2L
Sun Jan 13, 2019 8:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Example in Class
Replies: 7
Views: 131

Re: Example in Class

The yield of NH3 Increases when the amount of NH3 decreases because if the yield didn't increase then system wouldn't be in chemical equilibrium, decreasing product leads to more reactions on the reactant side which lead to an increase in product.
by Jaqueline Monreal 2L
Sun Dec 09, 2018 6:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 13
Views: 294

Re: Seesaw

the angles for seesaw are <90 and <120
by Jaqueline Monreal 2L
Sun Dec 09, 2018 6:41 pm
Forum: Naming
Topic: Chloro vs Chlorito
Replies: 8
Views: 239

Re: Chloro vs Chlorito

they accept both chloro is the traditional way of calling it and chlorito is the new way
by Jaqueline Monreal 2L
Sun Dec 09, 2018 6:40 pm
Forum: Bronsted Acids & Bases
Topic: Lewis vs Bronsted
Replies: 10
Views: 290

Re: Lewis vs Bronsted

for bronsted : acids donate protons and bases accepts protons
for lewis: acids accept electrons and bases donate electron
by Jaqueline Monreal 2L
Sun Dec 02, 2018 11:20 pm
Forum: Coordinate Covalent Bonds
Topic: Oxidation states "()" in naming coord compounds
Replies: 4
Views: 191

Re: Oxidation states "()" in naming coord compounds

Yes the Roman numerals will always be positive
by Jaqueline Monreal 2L
Sun Dec 02, 2018 11:18 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Water
Replies: 4
Views: 87

Re: Water

Water is neutral because it can both receive an proton (act as base) and give a proton (act as acid )
by Jaqueline Monreal 2L
Sun Dec 02, 2018 11:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 13
Views: 294

Re: Seesaw

Since there is an electron pair , instead of having a 90 and 120 bond angle twist have a <120 and <90 bond angle
by Jaqueline Monreal 2L
Sat Nov 24, 2018 3:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Slightly less than bond angles
Replies: 4
Views: 58

Re: Slightly less than bond angles

lavelle said in lecture that you don't need to know the exact bond angle of the angles that are slightly less than the regular angle , you just have to show that you know it is slightly less than the regular angle
by Jaqueline Monreal 2L
Sat Nov 24, 2018 3:05 pm
Forum: Hybridization
Topic: double bonds
Replies: 14
Views: 190

Re: double bonds

single bond consists of a sigma bond
double bond consists of a sigma bond and pi bond
triple bond consists of a sigma bond and a pi bond
by Jaqueline Monreal 2L
Sat Nov 24, 2018 3:03 pm
Forum: Hybridization
Topic: Test 3
Replies: 13
Views: 214

Re: Test 3

the outline is posted online if you wanna know more into detail on what we're gonna be tested on but you should study the lectures from after the midterm up to last monday's lecture before break
by Jaqueline Monreal 2L
Sun Nov 18, 2018 3:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Molecules
Replies: 5
Views: 86

Re: Drawing Molecules

in lecture i think he said he would make sure that we wouldn't have to worry about drawing the 3d versions of the shapes since they can be difficult to draw , im not sure how we would show the shapes though, maybe just the 2d version
by Jaqueline Monreal 2L
Sun Nov 18, 2018 3:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar vs Tetrahedral
Replies: 8
Views: 166

Re: Square Planar vs Tetrahedral

although they both have four bonds the square planar has 2 more areas of electron density because of the extra 2 lone pairs, therefore they have to be different shapes
by Jaqueline Monreal 2L
Sun Nov 18, 2018 2:57 pm
Forum: Hybridization
Topic: Bond Angles
Replies: 12
Views: 208

Re: Bond Angles

im not sure but i think its the most effective and reliable way to figure it out, maybe you can use the VSEPR formula to figure it out
by Jaqueline Monreal 2L
Sun Nov 11, 2018 4:32 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability Trend
Replies: 6
Views: 315

Re: Polarizability Trend

polarizability increases right to left and up to down , which is the same as atomic radius and opposite of electronegativity
by Jaqueline Monreal 2L
Sun Nov 11, 2018 4:29 pm
Forum: Properties of Electrons
Topic: Polar vs Non polar
Replies: 11
Views: 388

Re: Polar vs Non polar

polar molecules result from polar bonding between atoms where electrons are not shared equally atoms from the same element do not form polar bonds because they share electrons equally the greater the difference in electronegativity then the more ionic the bond is and bonds that have ionic bonds nonp...
by Jaqueline Monreal 2L
Sun Nov 11, 2018 4:22 pm
Forum: Lewis Structures
Topic: Formal charges
Replies: 15
Views: 204

Re: Formal charges

i dont think you have to write it but it should be used to create your structure and make sure you did it correctly and have no extra overall charges (whether positive or negative) in your structure
by Jaqueline Monreal 2L
Sun Nov 04, 2018 12:06 pm
Forum: Administrative Questions and Class Announcements
Topic: What the Midterm Will Cover
Replies: 5
Views: 104

Re: What the Midterm Will Cover

i would look over the outlines he provided up to lewis acids and bases which is where he ended the lecture that he said the midterm was up to
by Jaqueline Monreal 2L
Sun Nov 04, 2018 12:01 pm
Forum: Electronegativity
Topic: What are the trends useful for?
Replies: 12
Views: 158

Re: What are the trends useful for?

the trends are useful for figuring out which element does in the center when drawing a lewis structure
by Jaqueline Monreal 2L
Sun Nov 04, 2018 11:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: s-block, p-block, d-block
Replies: 3
Views: 67

Re: s-block, p-block, d-block

yeah we should know the first three rows of the s p and d block and also know the exceptions like Cu and Cr
by Jaqueline Monreal 2L
Tue Oct 23, 2018 8:24 pm
Forum: Properties of Light
Topic: EM Energy Spectrum
Replies: 4
Views: 143

Re: EM Energy Spectrum

I'm pretty sure that the quantities of wavelengths for the light category that we need to use will be given to us, the outline doesn't say that we need to memorize them
by Jaqueline Monreal 2L
Tue Oct 23, 2018 8:19 pm
Forum: Properties of Light
Topic: Test 2 Equations
Replies: 14
Views: 265

Re: Test 2 Equations

i think the most important thing to know is what each equations is associated with and the keywords problems have that let you know what formula to use, and the units that go with each part of the equations so your answer has the correct units at the end
by Jaqueline Monreal 2L
Tue Oct 23, 2018 8:15 pm
Forum: *Particle in a Box
Topic: Test 2
Replies: 9
Views: 393

Re: Test 2

I think test 2 test up the multi electron atoms which is where we left off on in last Friday's lecture
by Jaqueline Monreal 2L
Thu Oct 18, 2018 7:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 3
Views: 61

Re: Rydberg Equation

i would ask to your TA if you can show work using the Rydberg equation
by Jaqueline Monreal 2L
Thu Oct 18, 2018 7:31 pm
Forum: Photoelectric Effect
Topic: units
Replies: 12
Views: 217

Re: units

yes to calculate wavelength you should always convert to meters to make sure youre converting correctly, and im pretty sure that most problems use joules as the unit for energy
by Jaqueline Monreal 2L
Thu Oct 18, 2018 7:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Formula
Replies: 4
Views: 119

Re: Bohr Formula

theres a negative number to show that when the energy levels decrease, energy is lost , so the calculated energy using this formula will be negative
by Jaqueline Monreal 2L
Sun Oct 07, 2018 12:12 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 137

Re: Molecular Formula

Because the molecular formula basically tells exactly the amount of atoms that are in each element and not the ratio, then all you have to do is count how many atoms are of each element type and make them your subscript for that element in the molecular formula
by Jaqueline Monreal 2L
Sun Oct 07, 2018 12:07 pm
Forum: Administrative Questions and Class Announcements
Topic: WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??
Replies: 5
Views: 164

Re: WHAT TYPE OF CALCULATOR IS ALLOWED ON EXAMS??

Scientific calculator is the best option , in lecture he said non-graphic calculators or calculators where you could store information or equations
by Jaqueline Monreal 2L
Wed Oct 03, 2018 12:19 am
Forum: SI Units, Unit Conversions
Topic: Week 1 Homework Assignment [ENDORSED]
Replies: 16
Views: 423

Re: Week 1 Homework Assignment [ENDORSED]

Yeah I think doing the modules will be really helpful even because they show what topics to focus on and what we might get tested on later

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