Search found 45 matches

by g orloff 1J
Sun Mar 10, 2019 11:21 pm
Forum: Zero Order Reactions
Topic: Graphs
Replies: 8
Views: 115

Re: Graphs

you should always have a linear graph based on the order of the reaction.
by g orloff 1J
Sun Mar 10, 2019 11:20 pm
Forum: Second Order Reactions
Topic: Temperature
Replies: 6
Views: 80

Re: Temperature

temperature only effects the rate constant.
by g orloff 1J
Sun Mar 10, 2019 11:18 pm
Forum: General Rate Laws
Topic: Rate Laws
Replies: 8
Views: 93

Re: Rate Laws

the formulas should be on the sheet we get on the exam, he shows us the derivation to understand where it comes from.
by g orloff 1J
Sun Feb 10, 2019 6:54 pm
Forum: Ideal Gases
Topic: derivatives and integrals
Replies: 6
Views: 166

Re: derivatives and integrals

He showed a way to solve using calculus to show how the equation was derived.
by g orloff 1J
Sun Feb 10, 2019 6:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Next Week
Replies: 6
Views: 97

Re: Midterm Next Week

gibbs free energy will not be on the midterm.
by g orloff 1J
Sun Feb 10, 2019 6:52 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: midterm
Replies: 5
Views: 75

Re: midterm

midterm covers everything up to entropy in the class but not gibbs free energy
by g orloff 1J
Sun Feb 03, 2019 11:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Constant P
Replies: 4
Views: 61

Re: Constant P

If another pressure value is not stated anywhere the p is 1 atm.
by g orloff 1J
Sun Feb 03, 2019 11:23 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: qv vs qp
Replies: 9
Views: 137

Re: qv vs qp

qv is heat at a constant volume qp is heat at a constant pressure.
by g orloff 1J
Sun Feb 03, 2019 11:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE table and Q
Replies: 6
Views: 182

Re: ICE table and Q

ICE tables are used to find the concentrations of the reaction at equilibrium. Q tells whether the reaction was at equilibrium or not at equilibrium.
by g orloff 1J
Tue Jan 15, 2019 4:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables [ENDORSED]
Replies: 11
Views: 149

Re: ICE Tables [ENDORSED]

Ice tables do not always start with the product being zero but based on what is given in the question.
by g orloff 1J
Tue Jan 15, 2019 4:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: test 1 [ENDORSED]
Replies: 7
Views: 167

Re: test 1 [ENDORSED]

I believe the first test will include weeks 1-2 because discussions sections are throughout week 3 (test week)
by g orloff 1J
Tue Jan 15, 2019 4:22 pm
Forum: Ideal Gases
Topic: Water
Replies: 13
Views: 207

Re: Water

aqueous means something mixed with water so water cannot be aqeueous
by g orloff 1J
Fri Dec 07, 2018 2:05 am
Forum: General Science Questions
Topic: how to draw a double bond that is coming at you
Replies: 6
Views: 204

Re: how to draw a double bond that is coming at you

usually in 3d structures there is a a solid line then dotted line and then a dark shaded triangular line to denote different kinds of bonds in shapes but I dont think we have to worry about drawing 3d structures.
by g orloff 1J
Fri Dec 07, 2018 2:03 am
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 244

Re: Final Exam

boiling points are usually figured out by bond strength, imfs and such.
by g orloff 1J
Fri Dec 07, 2018 2:00 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH for strong acids [ENDORSED]
Replies: 2
Views: 64

Re: pH for strong acids [ENDORSED]

A strong acid is assumed to completely dissolve in solution so yes.
by g orloff 1J
Fri Nov 30, 2018 12:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: One lone electron
Replies: 3
Views: 81

Re: One lone electron

the lone atom acts as a lone pair, called a radical, and still repels but not as much as a full lone pair.
by g orloff 1J
Fri Nov 30, 2018 12:38 am
Forum: Hybridization
Topic: CH2O hybridization
Replies: 9
Views: 1401

Re: CH2O hybridization

trigonal planar shape has 3 orbitals (AX3) making it sp2 hybridization.
by g orloff 1J
Fri Nov 30, 2018 12:35 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX2E2
Replies: 14
Views: 244

Re: AX2E2

The bond angles will be less than 109.5 due to the lone pairs pushing harder than the bound atoms.
by g orloff 1J
Fri Nov 30, 2018 12:34 am
Forum: Hybridization
Topic: Radicals
Replies: 3
Views: 69

Re: Radicals

Radicals do count as a region of electron density when determining hybridization.
by g orloff 1J
Fri Nov 30, 2018 12:32 am
Forum: Hybridization
Topic: Hybridization Notation
Replies: 10
Views: 180

Re: Hybridization Notation

Either way works but in a previous post i believe sp3d is preferred.
by g orloff 1J
Fri Nov 30, 2018 12:28 am
Forum: Determining Molecular Shape (VSEPR)
Topic: polar or not polar
Replies: 4
Views: 116

Re: polar or not polar

The CCl bonds are slightly more polar than the CH bonds making it slightly more polar. if the molecules are different the molecule is USUALLY polar
by g orloff 1J
Fri Nov 30, 2018 12:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 10
Views: 123

Re: VSEPR Notation

I don't thin AXE will be on the test specifically but VESPR and bond angles should be.
by g orloff 1J
Thu Nov 15, 2018 10:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar
Replies: 5
Views: 71

Re: Trigonal Planar

all that matters is just the number of atoms and lone pairs bound to the central atom. all bonds are treated the same in the VESPR model.
by g orloff 1J
Thu Nov 15, 2018 10:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing the VSPER Models
Replies: 4
Views: 119

Re: Memorizing the VSPER Models

I go by memorizing the total species bound to the central atom meaning all lone pairs and atoms bound to the CENTRAL ATOM. Then determine how many atoms are bound and how many lone pairs are bound and from that determine the shape and bond angles.
by g orloff 1J
Thu Nov 15, 2018 10:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double/Triple Bonds
Replies: 5
Views: 121

Re: Double/Triple Bonds

They do not change the bond angles, its the lone pairs which contribute mostly to that, however triple bonds are stronger than double or single bonds.
by g orloff 1J
Thu Nov 08, 2018 7:32 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 435

Re: Octet vs formal charge

there are some exceptions to the octet rule so always make sure formal charge is closest to zero.
by g orloff 1J
Thu Nov 08, 2018 7:23 pm
Forum: Dipole Moments
Topic: Polar and Nonpolar
Replies: 7
Views: 144

Re: Polar and Nonpolar

it also has to do with the shape of the molecule with one side having the opposite charge compared to the other side. A non polar molecule will have a symmetrical charge across the molecule.
by g orloff 1J
Thu Nov 08, 2018 7:20 pm
Forum: Resonance Structures
Topic: Dominant resonance structure
Replies: 4
Views: 71

Re: Dominant resonance structure

the most dominant resonance structure is the one with the formal charge closest to zero and is the most stable.
by g orloff 1J
Thu Nov 01, 2018 11:05 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 14
Views: 300

Re: Drawing Lewis Structures

the shape depends on the VESPR orientation which we haven't gone over yet but think about lone pairs as opposite charges so there is a positive side and negative side.
by g orloff 1J
Thu Nov 01, 2018 10:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 1186

Re: Formal charge purpose

formal charge allows us to determine which structure is the most stable when we draw it based on the available resonance structures.
by g orloff 1J
Thu Nov 01, 2018 10:49 pm
Forum: Properties of Light
Topic: Midterm Question 5a
Replies: 4
Views: 141

Re: Midterm Question 5a

The electrons only release discrete quanta energy values and can only emit certain wavelengths. I believe there was a big lecture back in about week 3 for reference.
by g orloff 1J
Thu Oct 25, 2018 11:34 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 73

Re: Quantum Numbers

the first three n,l, and m sub l are all integers the last one m sub s is +.5 or -.5
by g orloff 1J
Thu Oct 25, 2018 11:32 pm
Forum: Photoelectric Effect
Topic: Conditions that allow electron to be ejected from metal surface
Replies: 12
Views: 365

Re: Conditions that allow electron to be ejected from metal surface

Energy of the photon must be greater than or equal to the energy of an electron.
by g orloff 1J
Thu Oct 25, 2018 11:30 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Why is there a negative?
Replies: 4
Views: 159

Re: Why is there a negative?

to think about it in simpler terms, energy is taken out/ removed from the system therefore there is a negative.
by g orloff 1J
Thu Oct 25, 2018 11:29 pm
Forum: Properties of Light
Topic: Test 2
Replies: 7
Views: 248

Re: Test 2

test two will cover everything up to week 3.
by g orloff 1J
Thu Oct 25, 2018 8:57 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 484

Re: Work Function

use the equation Ek=hv-work function to find what you are looking for and use algebrato re arrange.
by g orloff 1J
Thu Oct 18, 2018 9:30 pm
Forum: Properties of Light
Topic: Friday 10/5 Lecture
Replies: 7
Views: 110

Re: Friday 10/5 Lecture

just remeber the difference between v for velocity and curly v for frequency.
by g orloff 1J
Thu Oct 18, 2018 9:25 pm
Forum: Einstein Equation
Topic: Energy of photon [ENDORSED]
Replies: 12
Views: 441

Re: Energy of photon [ENDORSED]

use E=hv for energy of a photon
by g orloff 1J
Thu Oct 18, 2018 9:02 pm
Forum: Properties of Light
Topic: Test 2 [ENDORSED]
Replies: 15
Views: 261

Re: Test 2 [ENDORSED]

everything from quantum world will be tested.
by g orloff 1J
Thu Oct 11, 2018 11:56 pm
Forum: Significant Figures
Topic: sig figs in periodic table
Replies: 6
Views: 251

Re: sig figs in periodic table

It is best to follow sig fig rules based on what is given to you in the question
by g orloff 1J
Thu Oct 11, 2018 11:54 pm
Forum: Einstein Equation
Topic: Units for v(frequency)
Replies: 11
Views: 158

Re: Units for v(frequency)

the units are Hz and s^(-1)
by g orloff 1J
Thu Oct 11, 2018 11:53 pm
Forum: Molarity, Solutions, Dilutions
Topic: memorizing [ENDORSED]
Replies: 4
Views: 294

Re: memorizing [ENDORSED]

I would focus on understanding the concepts then the formulas will make sense and you will understand how the problem works making the formulas a breeze.
by g orloff 1J
Thu Oct 04, 2018 9:27 pm
Forum: SI Units, Unit Conversions
Topic: L35 Tons Conversion Rate
Replies: 4
Views: 93

Re: L35 Tons Conversion Rate

1 ton is 2,000 lbs and 1 tonne is 1000kg so it depends on what your question asks for, it sounds like this is just dimensional analysis to get to your answer.
by g orloff 1J
Thu Oct 04, 2018 9:23 pm
Forum: Balancing Chemical Reactions
Topic: Problem H1 (7th EDITION) Part A
Replies: 4
Views: 91

Re: Problem H1 (7th EDITION) Part A

In order to add an oxygen to the product side you need to add an oxygen to the reactants. Atoms are not created or lost in a reaction.
by g orloff 1J
Tue Oct 02, 2018 12:12 am
Forum: Balancing Chemical Reactions
Topic: States of Atoms
Replies: 7
Views: 118

Re: States of Atoms

Its not a bad idea to start practicing now so when we get to topics later you will have some foundation, I recommend looking up solubility rules to help determine what is aqueous, other than that diatomics are gaseous, and you can usually determine the rest by knowing the pattern of the elements in ...

Go to advanced search