Search found 100 matches

by Jared_Yuge
Sat Mar 14, 2020 8:44 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: are there standard rates of formation?
Replies: 4
Views: 52

Re: are there standard rates of formation?

most likely for the test we will be given that information, not required to look it up from a chart ourselves.
by Jared_Yuge
Sat Mar 14, 2020 8:43 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: intensive vs extensive
Replies: 7
Views: 86

Re: intensive vs extensive

Extensive: mass dependent
intensive: mass independent
Determines what units or constants you use in equation
by Jared_Yuge
Sat Mar 14, 2020 8:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: negative sign
Replies: 6
Views: 86

Re: negative sign

When E is positive it is spontaneous, so delta G needs to be negative
by Jared_Yuge
Sat Mar 14, 2020 8:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Qc vs Kc
Replies: 8
Views: 299

Re: Qc vs Kc

When Q and Kc are equal then the reaction has reached equilibrium and Q will stay the same. This doesn't mean that the reaction is no longer occurring rather that both the forward reaction and the reverse reaction are happening at the same rate
by Jared_Yuge
Sat Mar 14, 2020 8:33 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Qc vs Kc
Replies: 8
Views: 299

Re: Qc vs Kc

Q will tend to go towards Kc, so when Q >Kc it will shift towards the reactants and when Q<Kc it will shift towards the products.
by Jared_Yuge
Sat Mar 14, 2020 3:28 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S
Replies: 8
Views: 86

Re: Delta S

Ssys + Ssurr = Stot
same thing applies when you make them all delta
by Jared_Yuge
Sat Mar 14, 2020 2:52 pm
Forum: Zero Order Reactions
Topic: 0 order
Replies: 6
Views: 75

Re: 0 order

concentration of reactants does not affect rate.
by Jared_Yuge
Sat Mar 14, 2020 2:51 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: heterogeneous catalyst
Replies: 4
Views: 35

Re: heterogeneous catalyst

Most heterogeneous catalysts are solids, and in order to maximize catalyst-substrate interaction it needs to be porous or finely divided.
by Jared_Yuge
Sat Mar 14, 2020 2:28 pm
Forum: First Order Reactions
Topic: Linear versus Non-Linear
Replies: 3
Views: 48

Re: Linear versus Non-Linear

The linear form is useful for graphical analysis and basic comprehension. It can also be useful for finding k, because its the slope of the line. Either work for simple calculation using the relationship between time and concentration of the reactant.
by Jared_Yuge
Sat Mar 14, 2020 2:21 pm
Forum: Balancing Redox Reactions
Topic: Acid or base?
Replies: 5
Views: 116

Re: Acid or base?

It will be given, but you might have to do some Ka pKa manipulation to find out, so make sure you remember how
by Jared_Yuge
Sat Mar 14, 2020 2:18 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Mechanisms
Replies: 3
Views: 33

Re: Mechanisms

With the reaction mechanisms method we can make educated guesses on reaction rates for untried reactions with the same or similar steps.
by Jared_Yuge
Sat Mar 14, 2020 2:09 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Mechanisms
Replies: 3
Views: 33

Re: Mechanisms

A reaction mechanism is the combination of all the elementary reactions that overall chemical change goes through.
by Jared_Yuge
Sat Mar 14, 2020 2:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy and Energy released/absorbed
Replies: 3
Views: 36

Re: Activation Energy and Energy released/absorbed

activation energy is always accounted for in both endo and exothermic reactions, but that doesn't determine net loss/gain of energy
by Jared_Yuge
Sat Mar 14, 2020 1:40 pm
Forum: Balancing Redox Reactions
Topic: Bronsted Neutralization reaction
Replies: 2
Views: 28

Re: Bronsted Neutralization reaction

write out the skeletal reaction like H+ ---> H20. and OH- ---> H2O and then follow the regular instructions for balancing a redox reaction.
by Jared_Yuge
Sat Mar 14, 2020 1:36 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation energy
Replies: 7
Views: 43

Re: Activation energy

Either Joules or Kilojoules per mole depending on the context of the problem
by Jared_Yuge
Sat Mar 14, 2020 1:34 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: determining a catalyst
Replies: 5
Views: 33

Re: determining a catalyst

If the reactant is included both in the initial reactants and the products of the final step then it is a catalyst, because it is used in the reaction but is reformed by the end
by Jared_Yuge
Sat Mar 14, 2020 1:32 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Transition State Theory
Replies: 3
Views: 29

Re: Transition State Theory

Transition state theory deals with all reactions, while collision theory applies only to reactions in the gas phase because all other phases are colliding much more frequently.
by Jared_Yuge
Sat Mar 14, 2020 1:29 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A- frequency factor
Replies: 2
Views: 20

Re: A- frequency factor

The frequency factor represents frequency of collisions between reactant molecules
by Jared_Yuge
Fri Mar 13, 2020 3:28 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Slow step
Replies: 7
Views: 80

Re: Slow step

If the observed rate law is given then you dont need to worry about identifying the slow step because it will just be the one that matches the given observed rate law
by Jared_Yuge
Thu Mar 12, 2020 7:56 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow step of reaction?
Replies: 5
Views: 39

Re: Slow step of reaction?

You would need to run the experiment, and then check with the pre equilibrium method to confirm. In the test the slow step will most likely be given.
by Jared_Yuge
Thu Mar 12, 2020 7:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 5
Views: 24

Re: Arrhenius equation

The rate constant is proportional to the reaction rate so if rate constant doubles so does the reaction rate.
by Jared_Yuge
Thu Mar 12, 2020 7:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 5
Views: 24

Re: Arrhenius equation

You use the Arrhenius equation when you need to determine the effect of a temp change on the rate constant, which changes the overall reaction rate.
by Jared_Yuge
Thu Mar 12, 2020 7:45 pm
Forum: General Science Questions
Topic: ENDGAME #12
Replies: 2
Views: 86

Re: ENDGAME #12

The pre equilibrium approach assumes that the reactants and intermediates are in equilibrium, namely the rate limiting step is at equilibrium because it is backed up at that point.
by Jared_Yuge
Thu Mar 12, 2020 7:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Equation Sheet on Final
Replies: 2
Views: 39

Re: Equation Sheet on Final

Lavelles website has the link to the equations and constants sheet that we have been using, so it seems it will suffice for the content we are being tested on. The rest of the other stuff we would need like enthalpy of formation values would no question be available to us in some way.
by Jared_Yuge
Thu Mar 12, 2020 7:35 pm
Forum: General Rate Laws
Topic: Rate-determining step
Replies: 7
Views: 94

Re: Rate-determining step

Usually the slow step will be given, but you might be given data about the different steps and have to analyze it to determine the rate determining step
by Jared_Yuge
Thu Mar 12, 2020 7:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 8
Views: 47

Re: Arrhenius Equation

More specifically the Arrhenius equation can show us the impact of temperature, a catalyst, energy barrier, and frequency and orientation of collisions, which are all not shown in the rate law.
by Jared_Yuge
Thu Mar 12, 2020 7:06 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activated Complex vs Transition State
Replies: 5
Views: 30

Re: Activated Complex vs Transition State

Activated complex refers to a range of configurations near the transition state that the atoms pass through in the transformation from products, while the transition state refers to only the highest potential energy configuration of the atoms during the reaction.
by Jared_Yuge
Thu Mar 12, 2020 7:02 pm
Forum: Balancing Redox Reactions
Topic: Balancing the redox rxn in an acidic solution
Replies: 5
Views: 28

Re: Balancing the redox rxn in an acidic solution

The difference between balancing in an acidic or a basic solution is when you are balancing H. If you have an acidic solution you just add H+ to the side that needs H+. But with a basic solution you need to add H2O to the side that needs the H+ and OH- to the other side, so that the net difference i...
by Jared_Yuge
Thu Mar 12, 2020 7:00 pm
Forum: Balancing Redox Reactions
Topic: Balancing the redox rxn in an acidic solution
Replies: 5
Views: 28

Re: Balancing the redox rxn in an acidic solution

From their oxidation numbers determine the species being oxidized and reduced and then from their unbalanced equations balance the half reactions, then have the electrons in both equations cancel by multiplying both equations to make them cancel, then you can combine the equations, cancel stuff out,...
by Jared_Yuge
Thu Mar 12, 2020 6:53 pm
Forum: General Rate Laws
Topic: Elementary reactions
Replies: 4
Views: 38

Re: Elementary reactions

If the rate of the reaction is proportional to the concentration of the reactants then it is an elementary reaction
by Jared_Yuge
Thu Mar 12, 2020 6:49 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: What was your favorite chem topic?
Replies: 24
Views: 190

Re: What was your favorite chem topic?

Molecular shape and structure for sure Ellis! Maybe ochem will suite me better who knows
by Jared_Yuge
Sun Feb 09, 2020 6:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law of Themordynamics
Replies: 4
Views: 43

Re: First Law of Themordynamics

The Law of Conservation of Energy was coined by Mayer in 1842, and now it has been compiled with the others as the 1st law of Thermodynamics. They are one and the same
by Jared_Yuge
Sun Feb 09, 2020 6:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Favorability of Endothermic Reactions
Replies: 5
Views: 45

Re: Favorability of Endothermic Reactions

Yes because endothermic reactions require energy for the reaction to go forward, so endothermic reactions are held back by the lack of energy, but when you supply that energy in the form of heat with higher temperatures the reaction is allowed to take place more often resulting in a equilibrium shif...
by Jared_Yuge
Sun Feb 09, 2020 6:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 7
Views: 66

Re: Delta U

delta U can be 0 when a system is doing work as a reversible expansion and when the energy lost is replaced by heat flow into the system (isothermic).
by Jared_Yuge
Sun Feb 09, 2020 6:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy Formula
Replies: 2
Views: 34

Re: Enthalpy Formula

We can definitely use that equation, cause its just a reworked 1st law equation. Under constant pressure q=delta H and w= -P deltaV
by Jared_Yuge
Sun Feb 09, 2020 6:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: state function mnemonic device
Replies: 3
Views: 43

state function mnemonic device

Anyone know a good mnemonic device for all the state variables we need to know?
by Jared_Yuge
Sun Feb 09, 2020 6:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Clarification on a group of energy concepts
Replies: 3
Views: 28

Re: Clarification on a group of energy concepts

U is internal energy, meaning the energy inside of a system at a time. Is also a state function. Usually used in terms of change of internal energy, delta U
by Jared_Yuge
Sun Feb 09, 2020 6:26 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 2
Views: 17

Re: Gibbs Free Energy

Because heat and work are related to delta U directly as the two different methods showing how energy is transferred in and out of the system. Say delta U was +2kJ, the q and w could be any combination of energy values as long as the sum is +2kJ.
by Jared_Yuge
Sun Feb 02, 2020 11:52 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: ∆U
Replies: 8
Views: 67

Re: ∆U

U is a state property representing internal energy of a system. So in equations it represents the change in internal energy from initial and final states.
by Jared_Yuge
Sun Feb 02, 2020 11:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Different ways to calculate change in U
Replies: 4
Views: 19

Re: Different ways to calculate change in U

This is assuming it is an open or closed system with a piston, where heat and compression/expansion change, but in an isolated system the delta U is just q + w =0 because the point of an isolated system is that the internal energy doesn't change
by Jared_Yuge
Sun Feb 02, 2020 11:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Different ways to calculate change in U
Replies: 4
Views: 19

Re: Different ways to calculate change in U

if delta P is 0 (under constant pressure) then delta U = delta H - P deltaV
by Jared_Yuge
Sun Feb 02, 2020 11:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Different ways to calculate change in U
Replies: 4
Views: 19

Re: Different ways to calculate change in U

If delta V is 0 (constant volume) then its just deltaU = q
by Jared_Yuge
Sun Feb 02, 2020 11:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Different ways to calculate change in U
Replies: 4
Views: 19

Re: Different ways to calculate change in U

In a closed system with no constants its just delta U = q +w
by Jared_Yuge
Sun Feb 02, 2020 11:38 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U
Replies: 9
Views: 69

Re: delta U

if delta P is 0 (under constant pressure) then delta U = delta H - P deltaV
by Jared_Yuge
Sun Feb 02, 2020 11:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U
Replies: 9
Views: 69

Re: delta U

If delta Volume is 0 then delta U = work
by Jared_Yuge
Sun Feb 02, 2020 11:26 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy of formation vs. heat capacity
Replies: 2
Views: 20

Re: Enthalpy of formation vs. heat capacity

heat capacity is the energy required to raise temp of a substance which is much different from the energy change from forming a bond. These are separate ideas as one deals with change in temp and phase of a substance and the other is chemical changes to the substance
by Jared_Yuge
Sun Jan 19, 2020 11:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 2
Views: 20

Re: 5% rule

Its basically there to save us time so we dont have to use the quadratic formula, plus we can assume the change to the concentration to the reactant is nonexistent which is nice as well. You can always just do the problems with the quadratic formula and it will still be correct if you ever forget th...
by Jared_Yuge
Sun Jan 19, 2020 11:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q
Replies: 6
Views: 55

Re: Q

for example, when K>Q, then the reaction shifts to the right
by Jared_Yuge
Sun Jan 19, 2020 11:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different ways to write K
Replies: 3
Views: 30

Re: Different ways to write K

Its important to differentiate between the different K subscripts because they aren't all the same, Kw is a constant while Kc Ka Kb Kp all mean different things
by Jared_Yuge
Sun Jan 19, 2020 11:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: determining which way the reaction is going
Replies: 5
Views: 45

Re: determining which way the reaction is going

for example, when Kc>Q, then the reaction shifts to the right
by Jared_Yuge
Sun Jan 19, 2020 11:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: determining which way the reaction is going
Replies: 5
Views: 45

Re: determining which way the reaction is going

For aqueous solutions you need to calculate the Q of the solution currently and compare it to the Kc and then you can tell which way it is going.
by Jared_Yuge
Sun Jan 19, 2020 11:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Clarification on these statements
Replies: 2
Views: 20

Re: Clarification on these statements

shifted implies that the reaction was already at equilibrium and something changed it, and lies to the right/left just means that it is product/reactant favored
by Jared_Yuge
Sun Jan 19, 2020 11:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Applying Kw
Replies: 2
Views: 27

Re: Applying Kw

Kw is really nifty because if you have one of [OH-] or [H30+] you can find the other because you know Kw is 10^-14. Ba(OH)2 adds to the [OH] (you know Ba2+ doesnt affect) then you use the new [OH-] to find the [H30+].
by Jared_Yuge
Mon Dec 09, 2019 12:04 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Representing larger molecules
Replies: 4
Views: 130

Re: Representing larger molecules

Generally if your molecule has more than a few atoms its going to be listed in the order that it is formed so it generally isn't a problem, you just gotta make sure everything works out charge wise and octet rule wise. Regarding shape, you just consider one "central" atom at a time.
by Jared_Yuge
Sun Dec 08, 2019 11:58 pm
Forum: Hybridization
Topic: Identifying Hybrid Orbitals
Replies: 5
Views: 110

Re: Identifying Hybrid Orbitals

Just count the # of electron densities on the atom in question and count the orbitals to hybridize from there ie s, sp, sp2, sp3
by Jared_Yuge
Sun Dec 08, 2019 11:54 pm
Forum: *Titrations & Titration Calculations
Topic: Types of Titrations
Replies: 2
Views: 102

Re: Types of Titrations

The kinds we are doing right now are acid-base titrations but there are others like Redox Titrations, Precipitation Titrations. Complexometric Titrations.
by Jared_Yuge
Sun Dec 08, 2019 11:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE formula
Replies: 7
Views: 159

Re: AXE formula

AXE formula is used only regarding a single atom as the central atom, you can't have two As, so it simplifies it for us so all the X and Es are directly attatched to the central atom
by Jared_Yuge
Sun Dec 08, 2019 10:27 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and pKb
Replies: 2
Views: 88

Re: pKa and pKb

literally pKa just means the -log of the concentration of the products over the concentration of the reactants
by Jared_Yuge
Sun Dec 08, 2019 10:25 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH
Replies: 6
Views: 118

Re: pH

p just means -log of something, so for pH that something is the concentration of H+ or H3O+ and the pOH is substituting in the concentration of OH-
by Jared_Yuge
Sun Dec 08, 2019 10:22 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 2
Views: 101

Re: Bond lengths

It's hard to put down on paper, but the electrons making the bond are being shared with other atoms so the bond is only inbetween those two atoms half the time
by Jared_Yuge
Sun Dec 08, 2019 10:20 pm
Forum: Biological Examples
Topic: Biological Function
Replies: 2
Views: 81

Re: Biological Function

It kinda just squeezes itself into the H-N hydrogen bond in the backbone between two guanine or two adenine, causing a kink that prevents DNA replication
by Jared_Yuge
Sun Dec 08, 2019 10:10 pm
Forum: Biological Examples
Topic: Heme complex & O2
Replies: 5
Views: 100

Re: Heme complex & O2

Yes only one O2 can bind to each coordinate structure at a time
by Jared_Yuge
Sun Dec 08, 2019 10:09 pm
Forum: Student Social/Study Group
Topic: Cyanide
Replies: 5
Views: 169

Re: Cyanide

just draw a lewis dot structure of the molecule, make sure to add the extra charge somewhere, and then count the electrons directly touching the atom and find the difference between the number of electrons its supposed to have in a neutral state. Do that for both, and experiment with the bonds and t...
by Jared_Yuge
Sun Dec 08, 2019 9:56 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pka and ka
Replies: 4
Views: 126

Re: pka and ka

Ka is the concentration of the product over the concentration of the reactant.
by Jared_Yuge
Sun Dec 08, 2019 9:47 pm
Forum: Student Social/Study Group
Topic: heme complex
Replies: 5
Views: 209

Re: heme complex

5 ligands, the oxygen it picks up acts as the 6th completing the octahedral shape
by Jared_Yuge
Sun Dec 08, 2019 9:43 pm
Forum: Bronsted Acids & Bases
Topic: amphoteric
Replies: 7
Views: 165

Re: amphoteric

if the molecule in question is able to both accept a proton and give a proton then it is amphoteric as a general rule.
by Jared_Yuge
Sun Dec 08, 2019 9:40 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids.
Replies: 4
Views: 104

Re: Lewis Acids.

Generally in an equation you can look for the more electron deficient molecule of the two assuming its a lewis acid base reaction
by Jared_Yuge
Sun Dec 08, 2019 9:38 pm
Forum: Polyprotic Acids & Bases
Topic: Amphiprotic vs Amphoteric
Replies: 6
Views: 134

Re: Amphiprotic vs Amphoteric

Same thing with lewis and bronstead definitions, both mean essentially the same thing, just one is a more specific definition
by Jared_Yuge
Sun Dec 01, 2019 11:57 pm
Forum: Bronsted Acids & Bases
Topic: Definition
Replies: 3
Views: 36

Re: Definition

The Bronstead-Lowry definition of acids and bases are PROTON donors/acceptors. acids being proton donors and bases being proton acceptors
by Jared_Yuge
Sun Dec 01, 2019 11:50 pm
Forum: Amphoteric Compounds
Topic: amphoteric compounds
Replies: 2
Views: 37

Re: amphoteric compounds

adding on, you can test for amphoteric substances by attempting to add or remove protons from the molecule.
by Jared_Yuge
Sun Dec 01, 2019 11:43 pm
Forum: Lewis Acids & Bases
Topic: Lewis acid & Bronstead Acid
Replies: 3
Views: 51

Re: Lewis acid & Bronstead Acid

A bronstead acid donates a proton (H+) while a lewis acid takes electrons
by Jared_Yuge
Sun Dec 01, 2019 11:39 pm
Forum: Naming
Topic: Latin names
Replies: 2
Views: 32

Re: Latin names

No but for some compounds they are useful to know for identification purposes
by Jared_Yuge
Sun Dec 01, 2019 11:38 pm
Forum: Amphoteric Compounds
Topic: amphiprotic and amphoteric
Replies: 9
Views: 101

Re: amphiprotic and amphoteric

An amphiprotic substance is one which can both donate hydrogen ions (protons) and also accept them like water. Amphoteric means that they have reactions as both acids and bases.
by Jared_Yuge
Sun Nov 24, 2019 11:52 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 3
Views: 33

Re: Sigma and Pi bonds

Because they are directly overlapping with the orbitals. Pi bonds are merely parallel with the orbitals
by Jared_Yuge
Sun Nov 24, 2019 11:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electron and molecular geometry of H20
Replies: 3
Views: 38

Re: electron and molecular geometry of H20

You mean molecular shape? VSEPR is plenty good enough
by Jared_Yuge
Sun Nov 24, 2019 11:48 pm
Forum: Bond Lengths & Energies
Topic: Boiling Point
Replies: 4
Views: 130

Re: Boiling Point

You always take them into account but if there is a greater intermolecular force that is stronger you consider those instead such as dipole-dipole.
by Jared_Yuge
Sun Nov 24, 2019 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw shape
Replies: 5
Views: 46

Re: Seesaw shape

The seesaw shape occurs when you have 5e density clouds with one lone pair.
by Jared_Yuge
Sun Nov 24, 2019 11:41 pm
Forum: Electronegativity
Topic: Hydrogen
Replies: 3
Views: 109

Re: Hydrogen

Hydrogen is just a weird element in general and doesn't follow a lot of the conventional rules of the periodic table.
thats why they put hydrogen all the way in the left corner even though its not an alkali metal
by Jared_Yuge
Sun Nov 24, 2019 11:39 pm
Forum: Hybridization
Topic: unused orbitals
Replies: 4
Views: 38

unused orbitals

what do you do when you only need 2 of the p orbitals to hybridize, do you just include the third one anyways or does it stay a p orbital.
by Jared_Yuge
Mon Nov 18, 2019 12:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 2
Views: 38

VSEPR

What does Vsepr stand for
by Jared_Yuge
Sun Nov 17, 2019 11:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pair shape
Replies: 3
Views: 42

lone pair shape

if when you consider what Atom to make a lone pair you consider the bond angles in reference to the other atoms why don't we take one from the axial plane say from a trigonal bipyramidal because its bond angle is 90 compared to the equitorial plane one of 120?
by Jared_Yuge
Sun Nov 17, 2019 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: pentagonal bipyramidal 3 lone pairs?
Replies: 2
Views: 36

pentagonal bipyramidal 3 lone pairs?

starting from a pentagonal bipyramidal if you turn 3 into lone pairs where would you put the third lone pair? would it still be on the equatorial plane? or would it need to be an axial because of the lone pair repulsion?
by Jared_Yuge
Thu Nov 14, 2019 12:01 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F 13
Replies: 1
Views: 39

3F 13

does the surface area of the dipoles matter more than having multiple dipoles attached at once in terms of strength of the intermolecular forces?
by Jared_Yuge
Sun Nov 10, 2019 11:50 pm
Forum: Bond Lengths & Energies
Topic: Double bond rotation
Replies: 2
Views: 53

Double bond rotation

Why do double bonds restrict rotation around an atom?
by Jared_Yuge
Sun Nov 10, 2019 11:43 pm
Forum: Coordinate Covalent Bonds
Topic: carbon monoxide formal charges
Replies: 4
Views: 138

carbon monoxide formal charges

Why does carbon monoxide have a +1 charge on the oxygen and a -1 charge on the carbon?
by Jared_Yuge
Sun Nov 10, 2019 11:41 pm
Forum: Electronegativity
Topic: oxygen vs nitrogen electronegativity
Replies: 3
Views: 62

oxygen vs nitrogen electronegativity

Why is oxygen less electronegative than nitrogen?
by Jared_Yuge
Sun Nov 10, 2019 11:40 pm
Forum: Dipole Moments
Topic: Dipole dipole forces
Replies: 2
Views: 36

Dipole dipole forces

What's the difference between dipole-dipole forces and induced dipole-induced dipole forces? I could not quite grasp this concept in the lecture
by Jared_Yuge
Tue Nov 05, 2019 10:57 pm
Forum: Trends in The Periodic Table
Topic: ionic radii
Replies: 4
Views: 74

ionic radii

why is it that an anion has a larger radius than its parent atom, I thought that when we add electrons the attraction gets stronger with the nucleus and it gets pulled in making it smaller.
by Jared_Yuge
Tue Nov 05, 2019 8:09 pm
Forum: Lewis Structures
Topic: 2C5 a)
Replies: 2
Views: 61

2C5 a)

For drawing the lewis structure of ClO, why is it that the unpaired electron is on the chlorine instead of the oxygen, which makes the formal charges -1 and 1 instead of it being on the oxygen which would make it 0 and 0
by Jared_Yuge
Sun Oct 27, 2019 6:29 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 73

Re: Octet Rule

In the case of oxygen and carbon, you would say that they are sharing their electrons because it is a covalent bond. If it were a scenario where there were ionic bonds then you could say that atom A took one electron from Atom B
by Jared_Yuge
Sun Oct 27, 2019 6:17 pm
Forum: Properties of Electrons
Topic: Electron removal
Replies: 11
Views: 131

Re: Electron removal

electrons that are farther away from the nucleus are easier to remove because they are less affected by the pull of the positively charged protons in the nucleus. Sort of like gravity, although idk how far that analogy can go
by Jared_Yuge
Sun Oct 27, 2019 5:54 pm
Forum: Trends in The Periodic Table
Topic: Central Atom
Replies: 13
Views: 94

Re: Central Atom

The atom with lowest ionization energy because they pull other atoms toward it with its electrons that it shares
by Jared_Yuge
Sun Oct 27, 2019 5:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: placement of the negative sign on charges
Replies: 4
Views: 67

placement of the negative sign on charges

is it 2- or -2 I've seen it both ways and idk if one is right and why
by Jared_Yuge
Sun Oct 27, 2019 5:15 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Vs. Oxidation Number
Replies: 4
Views: 60

Re: Formal Charge Vs. Oxidation Number

We can obtain oxidation numbers by arbitrarily assigning the electrons of each covalent bond to the more electronegative atom in the bond. This is in contrast to the Formal Charge which divides each bonding pair equally without concern for which atom may be more electronegative.
by Jared_Yuge
Sun Oct 13, 2019 10:26 pm
Forum: Properties of Light
Topic: Explanation of Balmer and Lyman Series
Replies: 4
Views: 58

Re: Explanation of Balmer and Lyman Series

Balmer series lies in the visible spectrum, Lyman series lies in the UV spectrum. The graphs showed the shooting out of energy packets from electrons jumping from one energy level to another.
by Jared_Yuge
Sun Oct 13, 2019 10:18 pm
Forum: Empirical & Molecular Formulas
Topic: Nomenclature
Replies: 11
Views: 400

Re: Nomenclature

Basic ones we should be able to figure out, but in general we will be given the molecular formula in questions. Most of the words are just flavor text anyways
by Jared_Yuge
Sun Oct 13, 2019 10:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Unit for Avogadro's Number
Replies: 10
Views: 321

Re: Unit for Avogadro's Number

Just look at what they are using in the question, cause if you understand what it represents then you can just use dimensional analysis and be done with that step, you shouldn't need to guess
by Jared_Yuge
Sun Oct 13, 2019 10:12 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 3167

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

yes as long as you have the correct answer and the grader can tell what you did then you'll get credit
by Jared_Yuge
Sun Oct 13, 2019 10:01 pm
Forum: Significant Figures
Topic: sig figs and periodic tables
Replies: 11
Views: 346

sig figs and periodic tables

which periodic table should I use in terms of to which decimal place cause a lot of them differ a lot.

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