Search found 77 matches

by san_2F
Sat Jan 25, 2020 6:33 pm
Forum: Ideal Gases
Topic: final exam pickup
Replies: 8
Views: 61

Re: final exam pickup

he posted an email saying our finals were ready for pickup on Friday. However, there was some talk about how if it wasn't picked up on that day, they would be disposed of, although I'm not too sure how true that is.
by san_2F
Sat Jan 25, 2020 6:31 pm
Forum: Ideal Gases
Topic: aqueous elements in eq calculation
Replies: 8
Views: 25

Re: aqueous elements in eq calculation

There are four main "states": solid, liquid, gas, and aqueous. In the equilibrium equation, you would include the gases and aqueous solutions, but you would exclude solids and liquids.
by san_2F
Sat Jan 25, 2020 6:27 pm
Forum: General Science Questions
Topic: Extra Credit
Replies: 10
Views: 90

Re: Extra Credit

I don't think there are any extra credit opportunities for 14 A or 14 B unfortunately :(
by san_2F
Sat Jan 25, 2020 6:27 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic and Exothermic
Replies: 13
Views: 32

Re: Endothermic and Exothermic

Endothermic reactions require heat in chemical reactions and delta H is positive whereas exothermic reactions release heat in chemical reaction and delta H is negative.
by san_2F
Sat Jan 25, 2020 6:23 pm
Forum: Phase Changes & Related Calculations
Topic: Entropy vs Enthalpy
Replies: 9
Views: 23

Re: Entropy vs Enthalpy

enthalpy is the amount of heat that is released or absorbed in a reaction whereas entropy is the degree of disorder. Generally, it takes energy to go from more disordered to less disordered, and energy is released when you go from less disorder to more disorder. Enthalpy and entropy are related in t...
by san_2F
Sat Jan 25, 2020 6:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure vs. Concentration
Replies: 5
Views: 16

Re: Partial Pressure vs. Concentration

When they tell you to use partial pressures, you have to use the given information and plug into PV=nRT to find bars/atmospheres. When it's partial concentration, then you would just find moles over liters.
by san_2F
Sun Jan 19, 2020 5:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Identifying endothermic vs exothermic
Replies: 7
Views: 17

Re: Identifying endothermic vs exothermic

When delta H is negative, it's exothermic and when delta H is positive, the reaction is endothermic.
by san_2F
Sun Jan 19, 2020 5:37 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 166

Re: Topics on Test 1

All of outline 1 and outline 2 will be on this test, which includes ICE table, Ka, Kb, and Le Chatlier's. The best way to study is to do the outline problems.
by san_2F
Sun Jan 19, 2020 5:35 pm
Forum: Ideal Gases
Topic: concentration
Replies: 5
Views: 12

Re: concentration

You can use PV=nRT given moles and volume and you solve for P.
by san_2F
Sun Jan 19, 2020 5:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE tables
Replies: 3
Views: 15

Re: ICE tables

We use ICE tables when a system was disturbed and you want to find the new equilibrium concentrations given the Kc.
by san_2F
Sun Jan 19, 2020 5:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pH vs. pOH
Replies: 13
Views: 30

Re: pH vs. pOH

You know whether you are calculating for a base or for an acid based on whether there is OH being produced or H3O+.
by san_2F
Sat Jan 11, 2020 1:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 19
Views: 73

Re: Le Chatelier's Principle

You use the Chatlier's Principle any time a reaction at equilibrium is disturbed. This includes when concentrations of either reactants are products are increased or decrease, when pressure is increased or decreased, and when temperature is increased or decreased.
by san_2F
Sat Jan 11, 2020 1:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 10
Views: 47

Re: K vs. Q

K is the fixed equilibrium constant value for a certain reaction. Q is the reaction quotient and is used when it is certain that the reaction is not at equilibrium yet. For example, if you add more products, the reaction will not be at equilibrium the moment you add more products, so you would calcu...
by san_2F
Sat Jan 11, 2020 1:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 5
Views: 18

Re: ICE Tables

ICE table only involve gases and aqueous substances. We assume the the concentrations of solids and liquids are 1.
by san_2F
Sat Jan 11, 2020 1:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in k
Replies: 11
Views: 40

Re: Change in k

K is the equilibrium constant. The keyword there is constant meaning that for a certain reaction, no matter how much the initial concentration, the K value will always be the same for that reaction.
by san_2F
Sat Jan 11, 2020 1:18 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 166

Re: Topics on Test 1

I think it will be things from both outline one and outline two since we covered the main ideas from outline one this week.
by san_2F
Sun Dec 08, 2019 11:44 pm
Forum: Conjugate Acids & Bases
Topic: Neutralization Equations
Replies: 3
Views: 57

Re: Neutralization Equations

A neutralization reaction involves a strong acid and strong base and produces a salt and water. Both the salt and water are neutral.
by san_2F
Sun Dec 08, 2019 11:41 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Final question
Replies: 1
Views: 34

Re: Final question

I think it was for BeO and Al2O3. These are amphoteric oxides. That's just something you know or don't because it's hard to determine that.
by san_2F
Sun Dec 08, 2019 11:38 pm
Forum: Hybridization
Topic: Identifying Hybrid Orbitals
Replies: 5
Views: 34

Re: Identifying Hybrid Orbitals

I think all atoms in a molecule have hybrid orbitals and this is determined by the number of regions of electron densities there are.
by san_2F
Sun Dec 08, 2019 11:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H3O+
Replies: 11
Views: 74

Re: H3O+

H3O+ is a tetrahedral molecule and has bond angle of 120
by san_2F
Sun Dec 08, 2019 11:35 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty
Replies: 6
Views: 58

Re: Uncertainty

yes, they are the same thing and can be used interchangeably.
by san_2F
Sun Dec 08, 2019 11:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bent v. angular
Replies: 20
Views: 107

Re: bent v. angular

Bent and angular are the same thing and produce the same shape. However, be careful of the bond angles because are two different bond angles depending on how many electron density fields there are.
by san_2F
Sun Dec 08, 2019 11:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Final tips
Replies: 19
Views: 149

Re: Final tips

I think what helped me most for the final was doing all the textbook problems and readings as well as really understanding the lecture notes.
by san_2F
Sun Dec 08, 2019 11:26 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 17
Views: 101

Re: Cisplatin

he just said that it affects normal healthy cells and either damages them or stops the replication fo them.
by san_2F
Sun Dec 08, 2019 11:25 pm
Forum: General Science Questions
Topic: Curve
Replies: 9
Views: 100

Re: Curve

I think that the grades get curved after inputing the final and assessing the final grade. Also, I have heard that he doesn't necessarily always curve the class, for example if everyone does well on the final.
by san_2F
Sun Dec 08, 2019 11:23 pm
Forum: Naming
Topic: "Ferrate"
Replies: 14
Views: 131

Re: "Ferrate"

Ferrate is used when the overall complex has a negative charge and there is Iron in the complex. the same concept works for copper and cupperate.
by san_2F
Sun Dec 08, 2019 11:21 pm
Forum: Administrative Questions and Class Announcements
Topic: curve
Replies: 8
Views: 100

Re: curve

He supposedly curves after he determines final grades but he also doesn't necessarily always curve.
by san_2F
Sun Dec 08, 2019 11:19 pm
Forum: Air Pollution & Acid Rain
Topic: Final Exam
Replies: 4
Views: 75

Re: Final Exam

I think we were just supposed to know the formulas for acid rain. There are two formulas invovlving SO3 and CO3 but both didn't end up showing up on the test.
by san_2F
Sun Dec 08, 2019 11:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: common acids and bases
Replies: 4
Views: 39

Re: common acids and bases

Strong Acids: HCl, HI, HBr, H2SO4, HClO4, HNO3
Strong Bases: NaOH, KOH, LiOH, Ca(OH)2, Sr(OH)2, Ba(OH)2
by san_2F
Sun Dec 08, 2019 11:13 pm
Forum: Student Social/Study Group
Topic: heme complex
Replies: 5
Views: 87

Re: heme complex

I'm pretty sure the heme complex has 4 ligands that are composed of N atoms.
by san_2F
Sun Dec 08, 2019 11:12 pm
Forum: Student Social/Study Group
Topic: most stable
Replies: 6
Views: 41

Re: most stable

That is not necessarily true. The most stable lewis structure is when the formal charge is 0 with all the atoms in the molecules.
by san_2F
Sun Dec 08, 2019 11:08 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 1
Views: 41

Re: final

yes carbon monoxide can bind to the heme complex the same way CN- binds to the heme complex
by san_2F
Mon Dec 02, 2019 12:23 am
Forum: Bronsted Acids & Bases
Topic: Final
Replies: 13
Views: 81

Re: Final

its cumulative so it's all the main topics from the beginning of the year
by san_2F
Mon Dec 02, 2019 12:22 am
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 21
Views: 100

Re: T-shape

t shapes have two lone pairs and 3 bondes pairs
by san_2F
Mon Dec 02, 2019 12:22 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Strength
Replies: 4
Views: 34

Re: Strength

a strong base produces more oh ions
by san_2F
Mon Dec 02, 2019 12:21 am
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 103

Re: Sigma vs. Pi

sigma bonds would be stronger
by san_2F
Mon Dec 02, 2019 12:20 am
Forum: Administrative Questions and Class Announcements
Topic: Monday's Lecture
Replies: 2
Views: 17

Re: Monday's Lecture

he will be continuing from where he left off
by san_2F
Sun Nov 24, 2019 5:08 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 12
Views: 77

Re: Electronegativity

The greater the electronegativity difference between the elements, the stronger the bond and therefore the shorter the bond length.
by san_2F
Sun Nov 24, 2019 4:57 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 120

Re: Test 2 and Final

We will get test 2 back during the discussion of week 10. The final is cumulative, so it covers everything from week 1.
by san_2F
Sun Nov 24, 2019 4:55 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: pi and sigma bonds
Replies: 4
Views: 35

Re: pi and sigma bonds

Sigma bonds overlap horizontally while pi bonds overlap vertically.
by san_2F
Sun Nov 24, 2019 4:52 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 13
Views: 57

Re: Sigma and Pi bonds

Nothing actually changes when you draw the lewis structures. You just have to acknowledge that if there's more than one bond, than one of them is sigma and the rest are pi.
by san_2F
Sun Nov 24, 2019 4:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 14
Views: 109

Re: Test 2

In regards to studying intermolecular forces, I would say the best way is to read the chapter in the book about them and then do practice problems.
by san_2F
Sun Nov 17, 2019 11:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance and VSEPR
Replies: 9
Views: 40

Re: Resonance and VSEPR

No they are not considered because double bonds and triple bonds are not visually represented in vsper models.
by san_2F
Sun Nov 17, 2019 11:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing molecules
Replies: 12
Views: 72

Re: Drawing molecules

We would only need to draw the lewis structures, not the 3D model.
by san_2F
Sun Nov 17, 2019 11:28 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 843

Re: Study Tips

For the upcoming tests, a good way to memorize all the shapes, angles, and generla information would be to make a chart or study the pre-made charts that already exist on google.
by san_2F
Sun Nov 17, 2019 11:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 5
Views: 32

Re: Shapes

He spoke on this topic in my lecture when a student asked this question. He said to look at the individual molecules around it and determine each of their shape, and from there to arrange them.
by san_2F
Sun Nov 17, 2019 11:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trans vs Cis molecules
Replies: 2
Views: 22

Re: Trans vs Cis molecules

In regards to the specific molecule that he talked about during lecture, the trans molecule was when the r group was on opposite sides of the molecule and the cis molecule was when the r group was on the same side of the molecule. In addition, the trans isomer is non-polar while the cis isomer is po...
by san_2F
Mon Nov 11, 2019 8:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Test Policy
Replies: 6
Views: 70

Re: Test Policy

I think it's fine to just put the number next to the atom. That's what a lot of the TAs did too during review sessions are office hours.
by san_2F
Mon Nov 11, 2019 8:22 pm
Forum: Student Social/Study Group
Topic: Chem 14B
Replies: 10
Views: 88

Re: Chem 14B

Like everyone said, I think it's easier to take it after taking 14b because you already know the material so you will have a better idea of what you are going into.
by san_2F
Mon Nov 11, 2019 8:21 pm
Forum: Resonance Structures
Topic: What is a Resonance "Structure"
Replies: 12
Views: 78

Re: What is a Resonance "Structure"

Resonance structures are all the possible lewis structures a molecule can have given its in the same position. In a resonance structure, all the bonds are the same length.
by san_2F
Mon Nov 11, 2019 8:19 pm
Forum: Octet Exceptions
Topic: Limit to expanded octet
Replies: 7
Views: 78

Re: Limit to expanded octet

The limit would have to do with number of electrons an entire molecule can have and the formal charges.
by san_2F
Mon Nov 11, 2019 8:18 pm
Forum: Ionic & Covalent Bonds
Topic: Exam 2 & Homework
Replies: 5
Views: 43

Re: Exam 2 & Homework

We are allowed to turn in homework from chemical bonds I'm pretty sure and I think test two is week 8.
by san_2F
Sun Nov 03, 2019 8:50 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 3
Views: 50

Re: Midterm

It is not going to be on the midterm.
by san_2F
Sun Nov 03, 2019 8:48 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Problem
Replies: 1
Views: 12

Re: Electron Affinity Problem

The reason that Ne doesn't have higher electron affinity is because Ne already has 8 valance electrons so it doesn't want more electrons. I think the only exception is with the noble gases.
by san_2F
Sun Nov 03, 2019 8:42 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 3
Views: 34

Re: Lewis Structure

yes
by san_2F
Sun Nov 03, 2019 8:37 pm
Forum: Resonance Structures
Topic: Do we always need to draw resonance?
Replies: 1
Views: 18

Re: Do we always need to draw resonance?

Only if the lewis structure can have multiple ways to draw it, then you need to draw resonance.
by san_2F
Sun Nov 03, 2019 8:36 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 1
Views: 17

Re: Resonance Structures

If there are multiple ways to draw the same lewis structure with all the atoms in the same position, then the molecule has resonance structures.
by san_2F
Sun Nov 03, 2019 8:31 pm
Forum: DeBroglie Equation
Topic: Dino Nuggets Problem 6a
Replies: 2
Views: 72

Re: Dino Nuggets Problem 6a

I would go back through your calculations and make sure that your units are what they are supposed to be. For example, make sure you're converting grams to kilograms since some of the units are in kg. Also make sure you are finding unit per atom when they give it to you in unit per mole.
by san_2F
Sun Nov 03, 2019 8:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Electromagnetic radiation
Replies: 1
Views: 10

Re: Electromagnetic radiation

When electromagnetic radiation is emitted from the photon, the energy is released from that photon so the energy of the photon is decreased.
by san_2F
Sun Nov 03, 2019 8:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are shells, subshells, sublevels, and orbitals?
Replies: 2
Views: 27

Re: What are shells, subshells, sublevels, and orbitals?

shells are described by n, sub-shells/sublevels are described by the quantum number l, and orbitals are described my the quantum numbers ml.
by san_2F
Sun Nov 03, 2019 8:21 pm
Forum: *Particle in a Box
Topic: Nodes
Replies: 1
Views: 86

Re: Nodes

According to google, the particle in a box model displays how a particle can move freely in a space, but this led to the occurrence of nodes because there were certain places at which you could never find the position of the particles, which are the nodes.
by san_2F
Sun Nov 03, 2019 8:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Finding electron configurations
Replies: 4
Views: 35

Re: Finding electron configurations

For Gallium, the electron configuration would be [Ar]3d104s24p1. You would first fill the d shell, which goes has space for ten electron, 2 in each of the five orbitals. Then you would fill the 4s shell, and then the p shell. Using this same logic, the electron configuration for Niobium would be [Kr...
by san_2F
Sun Oct 20, 2019 12:08 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Radiation Type
Replies: 5
Views: 32

Re: Radiation Type

Our TA to mainly know that visible light is between 400-700 and then use that range to judge other types of radiation. So I guess you would have to memorize the order of types the radiation.
by san_2F
Sun Oct 20, 2019 12:05 am
Forum: Properties of Light
Topic: Unit for Wavelength
Replies: 34
Views: 163

Re: Unit for Wavelength

it's usually measured in meters but sometimes, problems can ask for it in nanometer, picometers, or angstroms.
by san_2F
Sat Oct 19, 2019 11:59 pm
Forum: Properties of Electrons
Topic: d vs s orbitals
Replies: 6
Views: 48

Re: d vs s orbitals

The one he was talking about was a specific exception regarding chromium. I believe for certain elements, you would write 4s before 3d because 4s has a slightly lower energy, but for others, it would be normal and you would write 4s after 3d.
by san_2F
Sat Oct 19, 2019 11:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin up and spin down
Replies: 13
Views: 100

Re: Spin up and spin down

He kinda said in class that we didn't need to really know all the details of it but it showed up during electron configuration and I think like if there's two electrons in each orbital state, they can't be parallel, but I am also not completely sure of how we know an electron is spin up or spin down...
by san_2F
Sat Oct 19, 2019 11:31 pm
Forum: Properties of Electrons
Topic: Circular Standing Wave
Replies: 4
Views: 45

Re: Circular Standing Wave

I think it can't be a decimal because an electron can only be in certain fixed orbital levels.
by san_2F
Fri Oct 11, 2019 6:03 pm
Forum: Properties of Electrons
Topic: Circular Standing Wave
Replies: 4
Views: 45

Re: Circular Standing Wave

Basically, the model about the circular wave that was shown in class today relates to the diagram that he drew with n=1,2,3..etc. Basically, if an electron gets excited to energy level n=1 or 2 or any integer, it exhibits the model with the circular standing wave that oscillated and "worked&quo...
by san_2F
Fri Oct 11, 2019 5:58 pm
Forum: DeBroglie Equation
Topic: Electrons in a box
Replies: 2
Views: 21

Re: Electrons in a box

I think he said that he would be going into more detail regarding electrons in the box next lecture, but I am also unsure on what this means.
by san_2F
Fri Oct 11, 2019 5:56 pm
Forum: Properties of Light
Topic: Converting units
Replies: 8
Views: 40

Re: Converting units

The method that I found easier was to first change it to meters and then use the meters to Angstrom equation to change it to Angstroms.
by san_2F
Fri Oct 11, 2019 5:52 pm
Forum: Empirical & Molecular Formulas
Topic: empirical = molecular?
Replies: 15
Views: 168

Re: empirical = molecular?

If it were different, you would have to divide the molar mass of the molecular formula by the molar mass of the empirical formula to found out what to multiply each of the components in the compound by.
by san_2F
Fri Oct 11, 2019 5:51 pm
Forum: Photoelectric Effect
Topic: Wavelengths?
Replies: 8
Views: 67

Re: Wavelengths?

Amplitude has to do with intensity. The higher the amplitude, the more intense the light is and the lower the amplitude, the less intense the light it.
by san_2F
Wed Oct 02, 2019 10:05 pm
Forum: Balancing Chemical Reactions
Topic: Tips on Balancing
Replies: 4
Views: 69

Re: Tips on Balancing

For this problem, you would start with the compound that would occur the least on both sides of the equation, which would be Fe in this case. You have two Fe on the left and 3 Fe on the right so to balance it, you would have to find their least common multiple which would be 6. So you would put a co...
by san_2F
Wed Oct 02, 2019 9:59 pm
Forum: Limiting Reactant Calculations
Topic: L3
Replies: 3
Views: 30

Re: L3

For part A, convert the 1.5 mg to grams and then convert the gram to moles. One mole of Li3N reacts with two moles of H2, so set up the ratio of 1 to 2 and use this ratio to find out how many moles of H2 were produced. For part B, one again use molar ratios found from the balanced chemical equation ...
by san_2F
Wed Oct 02, 2019 9:35 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reaction
Replies: 6
Views: 66

Re: Balancing Chemical Reaction

For any combustion reaction, butane reacts with oxygen to produce carbon dioxide and water. first balance the equation. After balancing the equation, look at the stoichiometric coefficient in front of oxygen and thats the number of moles of gas produced.
by san_2F
Wed Oct 02, 2019 9:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Problem E3
Replies: 2
Views: 33

Re: Problem E3

I think that you should clearly label units when cancelling to fully understand what your end result is. It also allows you to be a better problem solver because you know what units you started with and what units you need to end with, so you can use the information you know to get to your final des...
by san_2F
Wed Oct 02, 2019 9:08 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamentals Section M Homework M19
Replies: 3
Views: 54

Re: Fundamentals Section M Homework M19

First you would find the mass percent composition of each element. Imagine that the sample is 100g and then assume that the percents are just grams. Find how many moles of each element there are and divide all of them by the smallest value. If these values are not whole numbers, multiply them by a n...

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