Search found 108 matches

by saigorijavolu2k
Sun Mar 15, 2020 7:32 am
Forum: Balancing Redox Reactions
Topic: cathode vs anode
Replies: 11
Views: 125

Re: cathode vs anode

Anode is on the left and Cathode on the right
by saigorijavolu2k
Sun Mar 15, 2020 7:30 am
Forum: Student Social/Study Group
Topic: Tips and advice
Replies: 1
Views: 61

Re: Tips and advice

it is really helpful if you write down what you have. For example, like make a somewhat chart and then label what you are trying to find from there you can find an equation which will help you
by saigorijavolu2k
Sun Mar 15, 2020 7:29 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy and Heat
Replies: 4
Views: 73

Re: Enthalpy and Heat

Enthalpy is the change in how much heat there is under constant pressure, while heat is the transfer of energy caused by a temp difference
by saigorijavolu2k
Sun Mar 15, 2020 7:25 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat released/ gained
Replies: 4
Views: 73

Re: Heat released/ gained

It takes energy to break bonds and energy is released to form bonds
by saigorijavolu2k
Sun Mar 15, 2020 7:24 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm 6B
Replies: 3
Views: 62

Re: Midterm 6B

I chose a because the states of the reactants and products were similar thus an entropy change will not be too large, which implies a similar delta H and delta G
by saigorijavolu2k
Sun Mar 08, 2020 9:25 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: K
Replies: 11
Views: 50

Re: K

K is dependent on temperature.

K is not dependent on concentration (equilibirum)
by saigorijavolu2k
Sun Mar 08, 2020 9:24 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: K
Replies: 11
Views: 50

Re: K

K is dependent on temperature.

REMEMBER it is not dependent on concentration!
by saigorijavolu2k
Sun Mar 08, 2020 9:23 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 31256

Re: Final Jitters

Sleep!!!

Throughout the week review all the material and the day before just do practice and make sure you are eating and sleeping
by saigorijavolu2k
Sun Mar 08, 2020 9:22 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Exothermic vs. Endothermic
Replies: 14
Views: 50

Re: Exothermic vs. Endothermic

An exothermic reaction is one where the reactants have more energy than products. Exothermic releases energy, which is why the reactants should have more energy.
by saigorijavolu2k
Sun Mar 08, 2020 9:14 pm
Forum: General Rate Laws
Topic: Rate limiting step
Replies: 12
Views: 57

Re: Rate limiting step

The rate limiting step is the slow step of the elementary reaction. This step determines the order of a reaction.
by saigorijavolu2k
Sun Mar 08, 2020 9:10 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Molecularity
Replies: 12
Views: 56

Re: Molecularity

Molecularity is the number of molecules as a reactant.
For example, N2 + O2 --> 2NO, this is a bimolecular example
by saigorijavolu2k
Sun Mar 01, 2020 8:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: test 2 topics
Replies: 11
Views: 77

Re: test 2 topics

Basically all of electrochemistry and the gibbs free energy portion of thermochem
by saigorijavolu2k
Sun Mar 01, 2020 8:37 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Corrosion
Replies: 5
Views: 47

Re: Corrosion

Corrosion is when metals return to their natural oxidation states. It causes a loss in mass, which corresponds to the anode of a galvanic cell. To prevent this, another metal like zinc or chromium is used to prevent the corrosion
by saigorijavolu2k
Sun Mar 01, 2020 8:28 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: delta G=-nFE
Replies: 7
Views: 67

Re: delta G=-nFE

You balance the half reactions and find out how many electrons are transferred.
by saigorijavolu2k
Sun Mar 01, 2020 8:24 pm
Forum: Balancing Redox Reactions
Topic: oxidizing agents
Replies: 11
Views: 84

Re: oxidizing agents

The oxidizing agent means that it is oxidizing the thing, it causes the oxidization
by saigorijavolu2k
Sun Mar 01, 2020 8:21 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: when to use K or Q
Replies: 18
Views: 132

Re: when to use K or Q

K is the equilibrium constant and Q is when it is not at equilibrium
by saigorijavolu2k
Sun Feb 23, 2020 10:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: STP
Replies: 13
Views: 100

Re: STP

Standard Temp: 273 K
Standard Pressure: 1 atm
by saigorijavolu2k
Sun Feb 23, 2020 10:58 pm
Forum: Van't Hoff Equation
Topic: Thermo in Test 2
Replies: 6
Views: 68

Re: Thermo in Test 2

Also, review other thermo too because it may be implicitly tested.
by saigorijavolu2k
Sun Feb 23, 2020 10:56 pm
Forum: Balancing Redox Reactions
Topic: Oxidation?
Replies: 10
Views: 68

Re: Oxidation?

Oxidation is the loss of electrons. Think of the element getting more positive.
by saigorijavolu2k
Sun Feb 23, 2020 10:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 15
Views: 148

Re: Test 2

Test 2 covers everything after the midterm. But there might be some questions that connect previous topics to the ones after the midterm.
by saigorijavolu2k
Sun Feb 23, 2020 10:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 9
Views: 55

Re: Cell Diagrams

Commas means that the state did not change. One line represents state change. Two lines represent the salt bridge.
by saigorijavolu2k
Sun Feb 23, 2020 10:50 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneous reactions
Replies: 2
Views: 29

Re: spontaneous reactions

A negative delta S means that the reverse reaction is spontaneous. A positive delta S means that the forward reaction is spontaneous. A negative delta H means that it is exothermic and usually exothermic reactions are associated with being spontaneous because they release energy.
by saigorijavolu2k
Sun Feb 23, 2020 10:44 pm
Forum: General Science Questions
Topic: test 2
Replies: 1
Views: 119

Re: test 2

Finals week is week 11. We have our final about a week or so after.
by saigorijavolu2k
Mon Feb 17, 2020 10:37 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 418

Re: Isolated vs Closed [ENDORSED]

A closed system can only exchange energy with its surroundings.
An isolated system does not exchange anything.
Open can exchange heat and matter.

Think of a bomb calorimeter as an isolated system and a closed system would be like an open pan on stove, where energy is getting exchanged but not matter
by saigorijavolu2k
Mon Feb 17, 2020 10:30 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 13
Views: 181

Re: Reversible vs Irreversible

For a reversible equation Delta S is equal to -Delta S surr, which means that Delta S total is 0.
For irreversible Delta S is equal to Delta Stotal
by saigorijavolu2k
Mon Feb 17, 2020 10:29 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Exothermic rxns being spontaneous
Replies: 5
Views: 45

Re: Exothermic rxns being spontaneous

Spontaneous reactions have negative gibbs free energy. G= H-TS (include the deltas). If H is negative (exo) then the likelihood of the overall reaction being negative increases as long as entropy is positive. if entropy is negative then H (-H in this case) must be greater than TS
by saigorijavolu2k
Mon Feb 17, 2020 10:26 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 45
Views: 428

Re: Midterm Curve

I have heard that if the midterm/final scores are exceptionally lower than normal, he usually adjusts the grades bit. For 14A the final average was very high thus no curve, but after this midterm there might be one.
by saigorijavolu2k
Mon Feb 17, 2020 10:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: thermodynamically stable
Replies: 6
Views: 51

Re: thermodynamically stable

Thermodynamically stable is equivalent to a negative value for Gibbs. This also means that the rxn is favorable.
by saigorijavolu2k
Sun Feb 09, 2020 10:21 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: The sign of entropy
Replies: 2
Views: 25

Re: The sign of entropy

that is a very good question. I think that the sign of entropy is determined by how much disorder there is. If the substance is moving from solid to liquid, entropy is positive and vice versa.
by saigorijavolu2k
Sun Feb 09, 2020 10:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: q=H
Replies: 4
Views: 97

q=H

When does deltaH = q. I remember hearing that q always deltaH, but the reverse is not true? I am unsure if I heard correctly and why this is so/
by saigorijavolu2k
Sun Feb 09, 2020 10:13 pm
Forum: Phase Changes & Related Calculations
Topic: closed vs isolated
Replies: 10
Views: 72

Re: closed vs isolated

An isolated system cannot exchange any energy with its surroundings; however, a closed system can transfer energy (only).
by saigorijavolu2k
Sun Feb 09, 2020 10:12 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

Endothermic means that there is energy going into the reaction. So if there is an increase of temperature endothermic is favored because the increased heat allows the reaction to favor the products.
by saigorijavolu2k
Sun Feb 09, 2020 10:10 pm
Forum: General Science Questions
Topic: Midterm Review Questions ?
Replies: 3
Views: 66

Re: Midterm Review Questions ?

I would recommend going through each section and there are worked out problems that apply the concepts. This helps better understand the concepts and also find new ways of approaching problems
by saigorijavolu2k
Sun Feb 02, 2020 10:09 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Resources
Replies: 3
Views: 40

Resources

Does anyone have any good recommendations for online review materials that explain thermodynamics/thermochemistry well? i.e.) khan academy.

if so can you guys link them below!! thanks!
by saigorijavolu2k
Sun Feb 02, 2020 10:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 6
Views: 77

Re: Test 1

When Q < K, the forward reaction is favored.
When Q> K, the reverse reaction is favored.
Create a number line if you cannot remember this. if Q is to the left of K then it goes to the right towards K and if Q is to the right of K you go left towards K.
by saigorijavolu2k
Sun Feb 02, 2020 10:05 pm
Forum: Ideal Gases
Topic: Temperature
Replies: 17
Views: 126

Re: Temperature

Kelvin and Celsius increment by the same number, so in certain cases where units cancel out like q=mcdeltt it is valid. In a case where you are not sure, switch to kelvin.
by saigorijavolu2k
Sun Feb 02, 2020 10:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess’ Law
Replies: 10
Views: 76

Re: Hess’ Law

Hess's Law uses the enthalpies of intermediary reactions to calculate the total enthalpy. By using Hess's law , you are manipulating reactions to get rid of the intermediary reactants/products and up with the reaction you want. You then factor those manipulations into your calculations for enthalpy.
by saigorijavolu2k
Sun Feb 02, 2020 10:02 pm
Forum: Phase Changes & Related Calculations
Topic: Pressure in an Open Beaker
Replies: 10
Views: 58

Re: Pressure in an Open Beaker

Air pressure is the only pressure acting on the beaker and it does not change. The surroundings encompass a vast area, thus the pressure doesnt change.
by saigorijavolu2k
Sun Jan 26, 2020 7:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 12
Views: 144

Re: H2O as a Gas

Water is not used because it is a liquid. Pretend it is not there
by saigorijavolu2k
Sun Jan 26, 2020 7:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 9
Views: 60

Re: Hess's Law

Hess's law basically states that even though there may be intermediary steps in a reaction. The total enthalpy change is the sum of all changes because enthalpy is a state function
by saigorijavolu2k
Sun Jan 26, 2020 7:38 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Friday Lecture
Replies: 2
Views: 20

Re: Friday Lecture

We use the delta H tables to find the standard enthalpies and subract reactants from products. Also remember that O2, N2 and such have values of 0 and are not on the table.
by saigorijavolu2k
Sun Jan 26, 2020 7:36 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Using Method 2
Replies: 2
Views: 25

Re: Using Method 2

i believe that sometimes we will only be given the individual bond lengths and will have to use method 2.
by saigorijavolu2k
Mon Jan 20, 2020 9:57 am
Forum: Ideal Gases
Topic: PV=nRT
Replies: 13
Views: 121

Re: PV=nRT

If we are tested on this, we will be asked to find the pressure or even concentration and from there calculate the equilibrium constant.
by saigorijavolu2k
Mon Jan 20, 2020 9:55 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ice table
Replies: 5
Views: 37

Re: ice table

Solids and Liquids do not contribute to the equilibrium constant, thus do not need to be included in ICE tables.
by saigorijavolu2k
Mon Jan 20, 2020 9:55 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa and pKb
Replies: 17
Views: 141

Re: pKa and pKb

Think of Pka and Pkb as being calculated pretty much the same exact way as pH, except in this case you could calculate -log(ka) and ka is the acid dissociation constant used for weak acids.
by saigorijavolu2k
Mon Jan 20, 2020 9:53 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 167

Re: X was ignored

The x is ignored because it is such a small value, thus will not affect the answer extremely. When doing calculations with small x, make sure you do not just plug in 0, but rather emphasize that it is negligible not 0.
by saigorijavolu2k
Mon Jan 20, 2020 9:51 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Inert Gas
Replies: 9
Views: 69

Re: Adding Inert Gas

An inert gas is basically a noble gas. They are nonreactive as their octets are full
by saigorijavolu2k
Sun Jan 12, 2020 8:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: predicting effects
Replies: 9
Views: 121

Re: predicting effects

Removing a product will cause the product concentration to increase because the reaction goes in the forward direction to make up for this product removal
by saigorijavolu2k
Sun Jan 12, 2020 8:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Q
Replies: 10
Views: 68

Re: K and Q

Q is calculated when the reaction is not at equilibrium and K is. K remains the same.
by saigorijavolu2k
Sun Jan 12, 2020 8:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Inert Gases
Replies: 4
Views: 30

Re: Inert Gases

Inert gases are noble gases that have a full octet so they are not that reactive.
by saigorijavolu2k
Sun Jan 12, 2020 8:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 146

Re: Hw for next week

I believe that you can do either chemical equilibrium or acid bases. I believe Lavelle said if you have a discussion earlier in the week he doesn't expect you to do the acid and base homework.
by saigorijavolu2k
Sun Jan 12, 2020 8:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Comparing K Values
Replies: 4
Views: 52

Re: Comparing K Values

When K is closer to 1, then that means reactant and product concentrations are the same so that is thermodynamically stable
by saigorijavolu2k
Sun Dec 08, 2019 10:28 pm
Forum: Biological Examples
Topic: Heme complex & O2
Replies: 5
Views: 100

Re: Heme complex & O2

yup one O2 and a histidine to create myoglobin
by saigorijavolu2k
Sun Dec 08, 2019 10:27 pm
Forum: Air Pollution & Acid Rain
Topic: Carbon dioxide
Replies: 1
Views: 82

Re: Carbon dioxide

CO2 increases the concentration of carbonic acid which decreases PH and causes acidosis
by saigorijavolu2k
Sun Dec 08, 2019 10:25 pm
Forum: *Titrations & Titration Calculations
Topic: Type of Titration
Replies: 3
Views: 85

Re: Type of Titration

if the ph is 7 at the equivalence point it represents that a strong acid and strong base titrated together
by saigorijavolu2k
Sun Dec 08, 2019 10:23 pm
Forum: Student Social/Study Group
Topic: Cyanide
Replies: 5
Views: 169

Re: Cyanide

you draw the lewis structure and then subtract the valence electrons from bonds and lone pairs. CN has a triple bond.
by saigorijavolu2k
Sun Dec 08, 2019 10:20 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty
Replies: 5
Views: 132

Re: Uncertainty

delta x is the uncertainty in the position
by saigorijavolu2k
Sun Dec 01, 2019 10:18 pm
Forum: Lewis Acids & Bases
Topic: Arrhenius
Replies: 3
Views: 33

Re: Arrhenius

I would just know them just in case
by saigorijavolu2k
Sun Dec 01, 2019 10:17 pm
Forum: Bronsted Acids & Bases
Topic: Naming
Replies: 4
Views: 42

Re: Naming

I am honestly not sure
by saigorijavolu2k
Sun Dec 01, 2019 10:16 pm
Forum: Naming
Topic: -bis, -tris, etc
Replies: 5
Views: 68

Re: -bis, -tris, etc

you would use bis tris and etc when the name already has prefixes like bi
by saigorijavolu2k
Sun Dec 01, 2019 10:16 pm
Forum: Amphoteric Compounds
Topic: 6A.17
Replies: 5
Views: 68

Re: 6A.17

Amphoteric compounds are compounds that can react as an acid and base. If you react them with water, there would be 2 reactions. If you write this out then you can tell. Also it is general pattern. There is chart in the textbook which can help.
by saigorijavolu2k
Sun Dec 01, 2019 10:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Final
Replies: 3
Views: 143

Re: Final

I feel like the questions would be similarly formatted to the midterm. Reviewing the midterm can help a bit, but be prepared for anything.
by saigorijavolu2k
Sun Dec 01, 2019 10:12 pm
Forum: Naming
Topic: Water in Coordination Compounds
Replies: 7
Views: 66

Re: Water in Coordination Compounds

Usually in coordination compounds, the H20 becomes OH2. Since this is what bonds to the transition metal. I am not sure if we will be penalized for this.
by saigorijavolu2k
Sun Nov 24, 2019 10:09 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 8
Views: 71

Re: Cisplatin

Cisplatin attacks the dna of the cancer cells and inhibits their repair. Transplatin cannot do that.
by saigorijavolu2k
Sun Nov 24, 2019 10:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Drawing Structures
Replies: 4
Views: 60

Re: Drawing Structures

Yup you can just draw them normally :)
by saigorijavolu2k
Sun Nov 24, 2019 9:58 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Sphere
Replies: 5
Views: 58

Re: Coordination Sphere

the first coordiantion sphere is made up of molecules and ions directly attached to the central transition metal
by saigorijavolu2k
Sun Nov 24, 2019 9:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1215564

Re: Post All Chemistry Jokes Here

A neutron walks into a bar. He asks the bartender, "How much for a beer?" The bartender gives him a smile and says, "For you, no charge."
by saigorijavolu2k
Sun Nov 24, 2019 9:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1215564

Re: Post All Chemistry Jokes Here

Old chemists never die. They just stop reacting!
by saigorijavolu2k
Sun Nov 24, 2019 9:54 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 19
Views: 336

Re: sigma and pi bonds

For single bonds there only exists sigma and then for double and triple there are sigma and pi bonds
by saigorijavolu2k
Sun Nov 24, 2019 9:52 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Central atom?
Replies: 5
Views: 65

Re: Central atom?

Yes it has to be transition metals
by saigorijavolu2k
Sun Nov 17, 2019 7:15 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi
Replies: 11
Views: 144

Re: Sigma vs Pi

Sigma bonds are found in double triple bonds and Pi bonds are found in single bonds. Sigma are stronger than pi
by saigorijavolu2k
Sun Nov 17, 2019 7:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion strength and Bond Angles
Replies: 12
Views: 90

Re: Repulsion strength and Bond Angles

The repulsion would be different which will lead to a difference in bond angles
by saigorijavolu2k
Sun Nov 17, 2019 7:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 5
Views: 47

Re: Lone Pairs

Lavelle has gone over bent, trigonal pyramidal, see-saw, and square planar in class
by saigorijavolu2k
Sun Nov 17, 2019 7:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR bond angles
Replies: 3
Views: 43

VSEPR bond angles

How do I determine where each bond angle goes?
by saigorijavolu2k
Sun Nov 10, 2019 10:02 pm
Forum: Student Social/Study Group
Topic: Chem 14B
Replies: 10
Views: 145

Chem 14B

Who is taking 14B with Dr.Lavelle next quarter? Anyone taking BL?
by saigorijavolu2k
Sun Nov 10, 2019 10:01 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 1867

Re: Study Tips

What i would recommend doing is reading ur notes from lecture. Then attempting the hw problems for that section. And when u get stuck on a question write down the topics that correspond to it. Review those topics and reattempt the problem. This is a good way to assess your mastery of the material
by saigorijavolu2k
Sun Nov 10, 2019 9:57 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi
Replies: 11
Views: 144

Re: Sigma vs Pi

Sigma bonds are found in all type of bond. Pi are found in at minimum a double bond.
by saigorijavolu2k
Sun Nov 10, 2019 9:47 pm
Forum: Dipole Moments
Topic: London Interaction
Replies: 4
Views: 35

Re: London Interaction

LDF are also van der waals forces.
by saigorijavolu2k
Sun Nov 10, 2019 9:46 pm
Forum: Dipole Moments
Topic: Hydrogen Bonding
Replies: 6
Views: 51

Re: Hydrogen Bonding

H bonds are the strongest intermolecular force because of the great electronegativity difference between Hydrogen and NOF
by saigorijavolu2k
Sat Nov 02, 2019 8:20 pm
Forum: Properties of Electrons
Topic: Lewis acids and bases
Replies: 3
Views: 146

Re: Lewis acids and bases

lewis acids accept electrons, while lewis bases donate electrons. An example of lewis acid would be H+ and an example of a lewis base would be OH-.
by saigorijavolu2k
Sat Nov 02, 2019 8:17 pm
Forum: Octet Exceptions
Topic: radicals
Replies: 3
Views: 62

Re: radicals

An example of a radical would be OH- since it has 7 electrons
by saigorijavolu2k
Sat Nov 02, 2019 8:14 pm
Forum: Student Social/Study Group
Topic: Chemical Formulas
Replies: 3
Views: 60

Re: Chemical Formulas

I believe that Lavelle said that there might be some that show up as we are slowly learning more and more about naming.
by saigorijavolu2k
Sat Nov 02, 2019 8:13 pm
Forum: Bond Lengths & Energies
Topic: bond length
Replies: 6
Views: 87

Re: bond length

i am not sure, but the usual assumption is that the longer the bond, the weaker the bond.
by saigorijavolu2k
Sat Nov 02, 2019 8:08 pm
Forum: Electronegativity
Topic: electronegativity
Replies: 3
Views: 43

Re: electronegativity

In the midterm, I believe that we only will have a basic periodic table. We should know the trends for electronegativity, electron affinity, ionization energy and such and be able to identify it.
by saigorijavolu2k
Sun Oct 27, 2019 7:57 pm
Forum: Resonance Structures
Topic: Formal Charge
Replies: 5
Views: 72

Re: Formal Charge

no
by saigorijavolu2k
Sun Oct 27, 2019 7:56 pm
Forum: Lewis Structures
Topic: Choosing the central atom
Replies: 16
Views: 166

Re: Choosing the central atom

it is usually the least electronegative atom. Carbon is good
by saigorijavolu2k
Sun Oct 27, 2019 7:54 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 3
Views: 35

Drawing Lewis Structures

How exactly would you guys recommend drawing a lewis structure
by saigorijavolu2k
Sun Oct 27, 2019 7:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 5
Views: 64

Re: Formal Charge

A single bond is counted as one electron since it is shared hence the electrons in the equation are divided by 2
by saigorijavolu2k
Sun Oct 27, 2019 7:38 pm
Forum: Trends in The Periodic Table
Topic: Cations
Replies: 8
Views: 75

Re: Cations

Cations lose an electron, which means that their atomic radius is smaller. They oftentimes resemble the element before that which are smaller.
by saigorijavolu2k
Sun Oct 20, 2019 4:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin States
Replies: 4
Views: 44

Re: Spin States

Electrons must have different spin states so they can exist together in the same sublevel.

I'm pretty sure we just need to know how to draw the diagrams. so remember they must be in opposite directions
by saigorijavolu2k
Sun Oct 20, 2019 4:16 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 7
Views: 89

Re: Photoelectric Effect

Each photon must have enough energy to eject the electron. Increased intensity means that there are more photons. There must be an increased frequency.
by saigorijavolu2k
Sun Oct 20, 2019 4:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and Quantum Levels
Replies: 4
Views: 51

Re: Orbitals and Quantum Levels

After a while, the electron will fall back down to a lower energy level/original one and release this energy in the form of photons. When an electron returns to the ground state, it no longer releases energy.
by saigorijavolu2k
Sun Oct 20, 2019 3:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 5
Views: 59

Re: Electron Configuration Exceptions

these exceptions exist because a half-full or completely full d sub-level is more stable than the partially full one.
by saigorijavolu2k
Sun Oct 20, 2019 3:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 5
Views: 61

Re: Electron Configuration

The s shell fills up. Then the p shell fills up. Then d and f if they are applicable. The transition metals are where the d-orbital begins
by saigorijavolu2k
Sat Oct 12, 2019 12:41 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 1401

Re: M1V1=M2V2

Molarity is moles/liters. if a question asks you to find moles of a certain substance. Then you could break down M1V1=M2V2 into moles/liters*volume.
by saigorijavolu2k
Sat Oct 12, 2019 12:36 pm
Forum: Properties of Electrons
Topic: Electron After Excited State
Replies: 7
Views: 66

Re: Electron After Excited State

When electrons get excited they jump up to a higher energy level and they then release this energy in the form of a photon and eventually fall back to their original state.
by saigorijavolu2k
Sat Oct 12, 2019 11:09 am
Forum: Molarity, Solutions, Dilutions
Topic: Dilutions
Replies: 10
Views: 450

Re: Dilutions

I would use M1V1=M2V2. I would start by making sure that all my numbers are in the correct units. Then I would plug in all the values that you know. From there I would solve for the unknown. Often times with dilutions you have to read the question carefully. In this case, just make sure that units a...

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