Search found 69 matches

by saigorijavolu2k
Sun Jan 26, 2020 7:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 8
Views: 16

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: 29

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: 11

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: 17

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: 50

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: 18

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: 47

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: 78

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: 28

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: 8
Views: 23

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: 25

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: 14

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: 61

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: 32

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: 33

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: 27

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: 24

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: 43

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: 35

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: 21

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: 27

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: 47

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: 44

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: 42

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: 53

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: 41

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: 40

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: 31

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: 7774
Views: 1073504

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: 7774
Views: 1073504

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: 110

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: 44

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: 51

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: 48

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: 27

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: 24

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: 88

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: 838

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: 51

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: 20

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: 25

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: 52

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: 30

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: 34

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: 64

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: 24

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: 39

Re: Formal Charge

no
by saigorijavolu2k
Sun Oct 27, 2019 7:56 pm
Forum: Lewis Structures
Topic: Choosing the central atom
Replies: 16
Views: 69

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: 21

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: 31

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: 33

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: 29

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: 50

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: 41

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: 34

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: 29

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: 134

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: 35

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: 114

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...
by saigorijavolu2k
Sat Oct 12, 2019 10:46 am
Forum: Properties of Electrons
Topic: Wave properties
Replies: 5
Views: 34

Re: Wave properties

De Broglie's equation is basically used to describe the wave-like properties of matter. It suggests that particles with extremely small masses like electrons exhibit properties of waves that can be detected.
by saigorijavolu2k
Sat Oct 12, 2019 10:41 am
Forum: SI Units, Unit Conversions
Topic: knowing how many sig figs to use
Replies: 17
Views: 134

Re: knowing how many sig figs to use

I would say when you are working on intermediate calculations, then have more numbers and at the end round to correct number because if you round to close in the intermediate calculations that can affect your final answer by a lot.
by saigorijavolu2k
Tue Oct 01, 2019 1:47 pm
Forum: Molarity, Solutions, Dilutions
Topic: Symbol for Molarity
Replies: 7
Views: 76

Re: Symbol for Molarity

Sometimes if I am working with molar mass and Molarity I just write down the units rather than M
by saigorijavolu2k
Tue Oct 01, 2019 1:46 pm
Forum: Significant Figures
Topic: Answer is a little off?
Replies: 4
Views: 49

Re: Answer is a little off?

My answers also have been of because depending on which periodic table you use the masses are a little different and also how you round and when you round affects your answer as well.
by saigorijavolu2k
Tue Oct 01, 2019 1:45 pm
Forum: Significant Figures
Topic: Sig Fig Decimal
Replies: 10
Views: 88

Re: Sig Fig Decimal

114=114.
They both mean the same thing and they both have 3 sig figs
by saigorijavolu2k
Tue Oct 01, 2019 1:43 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Problem E.9c
Replies: 5
Views: 71

Re: Homework Problem E.9c

The problem refers to a heptahydrate and you have to account for its mass and moles when doing problems regarding it.
by saigorijavolu2k
Tue Oct 01, 2019 1:41 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 416

Re: Ionic vs Covalent

Most often Ionic bonds are stronger than covalent bonds; however, there are some covalent bonds stronger than ionic. Ionic bonds are formed as a result of a mutual attraction between ions that have opposite charges. Covalent bonds are formed as a result of the sharing of electrons. Ionic bonds are s...
by saigorijavolu2k
Tue Oct 01, 2019 1:36 pm
Forum: Molarity, Solutions, Dilutions
Topic: HW1 F3 Help
Replies: 4
Views: 74

Re: HW1 F3 Help

Any acid that ends in -ic means it is made up of a nitrate ion. AN easy way to remember it would be I ATE something ICky.
Thus Nitric Acid=HNO3

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