Search found 45 matches
- Sun Mar 10, 2019 11:21 pm
- Forum: Zero Order Reactions
- Topic: Graphs
- Replies: 8
- Views: 2144
Re: Graphs
you should always have a linear graph based on the order of the reaction.
- Sun Mar 10, 2019 11:20 pm
- Forum: Second Order Reactions
- Topic: Temperature
- Replies: 6
- Views: 604
Re: Temperature
temperature only effects the rate constant.
- Sun Mar 10, 2019 11:18 pm
- Forum: General Rate Laws
- Topic: Rate Laws
- Replies: 8
- Views: 837
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.
- Sun Feb 10, 2019 6:54 pm
- Forum: Ideal Gases
- Topic: derivatives and integrals
- Replies: 6
- Views: 977
Re: derivatives and integrals
He showed a way to solve using calculus to show how the equation was derived.
- Sun Feb 10, 2019 6:53 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm Next Week
- Replies: 6
- Views: 656
Re: Midterm Next Week
gibbs free energy will not be on the midterm.
- Sun Feb 10, 2019 6:52 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: midterm
- Replies: 5
- Views: 508
Re: midterm
midterm covers everything up to entropy in the class but not gibbs free energy
- 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: 421
Re: Constant P
If another pressure value is not stated anywhere the p is 1 atm.
- Sun Feb 03, 2019 11:23 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: qv vs qp
- Replies: 9
- Views: 2473
Re: qv vs qp
qv is heat at a constant volume qp is heat at a constant pressure.
- Sun Feb 03, 2019 11:15 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE table and Q
- Replies: 6
- Views: 1566
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.
- Tue Jan 15, 2019 4:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables [ENDORSED]
- Replies: 11
- Views: 2353
Re: ICE Tables [ENDORSED]
Ice tables do not always start with the product being zero but based on what is given in the question.
- 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: 877
Re: test 1 [ENDORSED]
I believe the first test will include weeks 1-2 because discussions sections are throughout week 3 (test week)
- Tue Jan 15, 2019 4:22 pm
- Forum: Ideal Gases
- Topic: Water
- Replies: 13
- Views: 1029
Re: Water
aqueous means something mixed with water so water cannot be aqeueous
- 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: 911
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.
- Fri Dec 07, 2018 2:03 am
- Forum: General Science Questions
- Topic: Final Exam
- Replies: 5
- Views: 834
Re: Final Exam
boiling points are usually figured out by bond strength, imfs and such.
- 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: 270
Re: pH for strong acids [ENDORSED]
A strong acid is assumed to completely dissolve in solution so yes.
- Fri Nov 30, 2018 12:40 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: One lone electron
- Replies: 3
- Views: 360
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.
- Fri Nov 30, 2018 12:38 am
- Forum: Hybridization
- Topic: CH2O hybridization
- Replies: 9
- Views: 15231
Re: CH2O hybridization
trigonal planar shape has 3 orbitals (AX3) making it sp2 hybridization.
- Fri Nov 30, 2018 12:35 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX2E2
- Replies: 14
- Views: 4474
Re: AX2E2
The bond angles will be less than 109.5 due to the lone pairs pushing harder than the bound atoms.
- Fri Nov 30, 2018 12:34 am
- Forum: Hybridization
- Topic: Radicals
- Replies: 3
- Views: 497
Re: Radicals
Radicals do count as a region of electron density when determining hybridization.
- Fri Nov 30, 2018 12:32 am
- Forum: Hybridization
- Topic: Hybridization Notation
- Replies: 10
- Views: 873
Re: Hybridization Notation
Either way works but in a previous post i believe sp3d is preferred.
- Fri Nov 30, 2018 12:28 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polar or not polar
- Replies: 4
- Views: 645
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
- Fri Nov 30, 2018 12:25 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 10
- Views: 1166
Re: VSEPR Notation
I don't thin AXE will be on the test specifically but VESPR and bond angles should be.
- Thu Nov 15, 2018 10:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Planar
- Replies: 5
- Views: 450
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.
- Thu Nov 15, 2018 10:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorizing the VSPER Models
- Replies: 4
- Views: 466
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.
- Thu Nov 15, 2018 10:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double/Triple Bonds
- Replies: 5
- Views: 980
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.
- Thu Nov 08, 2018 7:32 pm
- Forum: Octet Exceptions
- Topic: Octet vs formal charge
- Replies: 16
- Views: 3061
Re: Octet vs formal charge
there are some exceptions to the octet rule so always make sure formal charge is closest to zero.
- Thu Nov 08, 2018 7:23 pm
- Forum: Dipole Moments
- Topic: Polar and Nonpolar
- Replies: 7
- Views: 762
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.
- Thu Nov 08, 2018 7:20 pm
- Forum: Resonance Structures
- Topic: Dominant resonance structure
- Replies: 4
- Views: 1729
Re: Dominant resonance structure
the most dominant resonance structure is the one with the formal charge closest to zero and is the most stable.
- Thu Nov 01, 2018 11:05 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 14
- Views: 1984
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.
- Thu Nov 01, 2018 10:58 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 6991
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.
- Thu Nov 01, 2018 10:49 pm
- Forum: Properties of Light
- Topic: Midterm Question 5a
- Replies: 4
- Views: 459
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.
- Thu Oct 25, 2018 11:34 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 3
- Views: 686
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
- Thu Oct 25, 2018 11:32 pm
- Forum: Photoelectric Effect
- Topic: Conditions that allow electron to be ejected from metal surface
- Replies: 12
- Views: 2129
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.
- Thu Oct 25, 2018 11:30 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Why is there a negative?
- Replies: 4
- Views: 471
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.
- Thu Oct 25, 2018 11:29 pm
- Forum: Properties of Light
- Topic: Test 2
- Replies: 7
- Views: 676
Re: Test 2
test two will cover everything up to week 3.
- Thu Oct 25, 2018 8:57 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 14
- Views: 2172
Re: Work Function
use the equation Ek=hv-work function to find what you are looking for and use algebrato re arrange.
- Thu Oct 18, 2018 9:30 pm
- Forum: Properties of Light
- Topic: Friday 10/5 Lecture
- Replies: 7
- Views: 633
Re: Friday 10/5 Lecture
just remeber the difference between v for velocity and curly v for frequency.
- Thu Oct 18, 2018 9:25 pm
- Forum: Einstein Equation
- Topic: Energy of photon [ENDORSED]
- Replies: 12
- Views: 1783
Re: Energy of photon [ENDORSED]
use E=hv for energy of a photon
- Thu Oct 18, 2018 9:02 pm
- Forum: Properties of Light
- Topic: Test 2 [ENDORSED]
- Replies: 15
- Views: 1183
Re: Test 2 [ENDORSED]
everything from quantum world will be tested.
- Thu Oct 11, 2018 11:56 pm
- Forum: Significant Figures
- Topic: sig figs in periodic table
- Replies: 6
- Views: 756
Re: sig figs in periodic table
It is best to follow sig fig rules based on what is given to you in the question
- Thu Oct 11, 2018 11:54 pm
- Forum: Einstein Equation
- Topic: Units for v(frequency)
- Replies: 11
- Views: 1210
Re: Units for v(frequency)
the units are Hz and s^(-1)
- Thu Oct 11, 2018 11:53 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: memorizing [ENDORSED]
- Replies: 4
- Views: 644
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.
- Thu Oct 04, 2018 9:27 pm
- Forum: SI Units, Unit Conversions
- Topic: L35 Tons Conversion Rate
- Replies: 4
- Views: 408
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.
- Thu Oct 04, 2018 9:23 pm
- Forum: Balancing Chemical Reactions
- Topic: Problem H1 (7th EDITION) Part A
- Replies: 4
- Views: 331
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.
- Tue Oct 02, 2018 12:12 am
- Forum: Balancing Chemical Reactions
- Topic: States of Atoms
- Replies: 7
- Views: 457
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 ...